U.S. patent number 3,797,589 [Application Number 05/351,628] was granted by the patent office on 1974-03-19 for self guiding force applicator.
This patent grant is currently assigned to Smith International, Inc.. Invention is credited to George Abraitys Alther, Jackson M. Kellner.
United States Patent |
3,797,589 |
Kellner , et al. |
March 19, 1974 |
SELF GUIDING FORCE APPLICATOR
Abstract
A self guiding force applicator includes a tubular mandrel to
deliver fluid to drilling means. A piston carried by the mandrel
moves in a cylinder to which fluid is supplied to force mandrel or
cylinder in or out. The mandrel and cylinder are connected by
spline means to prevent relative rotation while allowing relative
axial motion. Releasable anchor means anchors either cylinder or
mandrel to wall of bore hole dependent upon whether mandrel or
cylinder is to be moved. The mandrel anchor means is disposed at
the outer end of the force applicator to serve as a guide means
when in the released position during drilling. Also at the outer
end of the mandrel is a manifold for connecting conduits and
passages in the mandrel to an outer end of the force applicator.
The hose line is wound on an out-of-hole winch mounted on a trailer
cart. Launching means for the force applicator and drilling means,
together with supply and control means for the anchor means, piston
and cylinder means, and the drilling means, is also mounted on the
car.
Inventors: |
Kellner; Jackson M. (Midland,
TX), Alther; George Abraitys (Midland, TX) |
Assignee: |
Smith International, Inc.
(Midland, MI)
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Family
ID: |
23381655 |
Appl.
No.: |
05/351,628 |
Filed: |
April 16, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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189845 |
Oct 18, 1971 |
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Current U.S.
Class: |
175/94; 175/203;
175/99; 175/230 |
Current CPC
Class: |
E21B
19/22 (20130101); E21B 4/18 (20130101) |
Current International
Class: |
E21B
19/22 (20060101); E21B 4/18 (20060101); E21B
19/00 (20060101); E21B 4/00 (20060101); E21b
003/12 (); E21b 019/08 (); E21c 009/00 () |
Field of
Search: |
;175/94,97,99,98,230,203,122,62,220,53 ;51/72.7 ;299/31
;254/134.6 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Brown; David H.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of prior copending application
Ser. No. 189,845, filed Oct. 18, 1971, now abandoned.
Claims
That being claimed is:
1. Apparatus useful in earth boring comprising a wheeled cart, reel
means carried by the cart, multipassage hose means wound on the
reel, a storage and launch tube mounted on the cart, a bore wall
engageable force applicator adapted to be supported in said tube
and projectable therefrom, said hose means being connected to one
end of said applicator, a drilling machine connected to the other
end of said force applicator, said force applicator including a
tubular mandrel providing means for conveying operating fluid to
said drilling machine, hydraulically actuated piston and cylinder
means for applying axial force to the mandrel and including a
piston connected to the mandrel and a cylinder in which the piston
is slidable, anti-rotation means preventing relative rotation of
the mandrel and cylinder, first hydraulically actuated anchor means
connected to said cylinder at the end thereof nearest said drilling
machine, second hydraulically actuated anchor means connected to
said mandrel on the opposite side of said piston and cylinder means
from said first anchor means adjacent said one end of the force
applicator to which said hose is connected, and pressure fluid
supply and control means connected to said hose means for
separately supplying fluid to said drilling machine, each of said
anchor means, and to the piston and cylinder means on opposite
sides of said piston, said supply and control means including two
sources of pressure fluid one of which is connected to a passage of
said hose means that communicates with said drilling machine and
the other which is carried by said cart and is in communication
with separate passages in said hose means communicating with said
two anchor means and with said piston and cylinder means on
opposite sides of the piston thereof, said control and supply means
further including on said cart two separate means regulating the
pressure of fluid supplied to said piston and cylinder means on
opposite sides of the piston, a third means for regulating the
pressure of fluid supplied to said anchor means, and two separate
valve units, one unit connecting a selected one of said anchor
means with said second source while disconnecting the other
therefrom and the other unit connecting said second source to said
piston and cylinder means on one side of the piston while
disconnecting from said second source the piston and cylinder means
at the other side of the piston, and gage means indicating the
pressure supplied to said anchor means and to said piston and
cylinder means on opposite sides of the piston thereof.
2. Apparatus useful in earth boring, said apparatus comprising a
support, reel means carried by the support, hose means wound on the
reel, a storage and launch tube carried by said support, a bore
wall engageable force applicator disposed in said tube, one end of
said hose means being connected to said force applicator.
3. Apparatus according to claim 2 wherein said support includes a
cart and wheel means supporting said cart for movement in a
horizontal direction, said storage and launch tube is mounted on
said cart to be in a horizontal position when said cart is
supported by said wheel means for such horizontal movement, said
reel means is mounted for rotation about an axis parallel to the
axis of said tube, said apparatus further including power winch
means mounted for rotation about an axis that is vertical when said
cart is supported by said wheel means as aforesaid, said hose means
passing around said winch means between said reel means and said
force applicator, the edge of the inner periphery of said storage
and launch tube nearest said winch means being tangent to the outer
periphery of said winch means.
4. Apparatus according to claim 2, said force applicator
including
a tubular mandrel providing fluid passage means to convey drilling
fluid and providing means to apply axial force to a drilling
machine when connected to the mandrel,
two releasable anchor means each including a barrel disposed around
the mandrel and sealed thereto at axially spaced positions defining
a chamber between the barrel and mandrel, bore wall engageable
means mounted in the barrel for motion outwardly relative to the
mandrel axis and back toward it in response to the pressure
differential between inside said chamber and outside said force
applicator, and conduit means extending through the mandrel for
supplying pressure fluid to said chamber,
piston and cylinder means for exerting an axial force on said
mandrel including a piston connected to said mandrel, a cylinder
disposed around said piston and axially slidable relative thereto,
and separate conduit means extending through said mandrel for
supplying pressure fluid to said cylinder on opposite sides of said
piston,
the barrel of one of said anchor means being fixedly connected to
said mandrel,
the barrel of the other of said anchor means being fixedly
connected to said cylinder, and
means preventing relative rotation of said cylinder and said
mandrel,
said bore wall engageable means being engageable with the inner
periphery of said storage and launch tube when moved outwardly
under said pressure differential.
5. Apparatus according to claim 4 wherein said anchor means are
disposed on opposite sides of said piston and cylinder means, said
one anchor means fixedly connected to said mandrel being disposed
adjacent the end of said force applicator to which is connected
said hose means.
6. Apparatus according to claim 5, said hose means providing five
parallel fluid paths, said hose means being connected to said force
applicator by a manifold having five fluid passages therethrough,
said five fluid passages being connected respectively to said two
anchor means and to two opposite sides of said piston and cylinder
means and to said fluid passage means to convey drilling fluid,
said manifold also providing the means by which the barrel of said
one anchor means is connected to said mandrel.
7. Apparatus useful in earth boring, said apparatus comprising a
force applicator includng
a tubular mandrel having means at one end thereof for making
connection at least indirectly with a drilling machine, said one
end constituting the inner end of the mandrel and the opposite end
of the mandrel constituting the outer end of the mandrel,
said mandrel providing means to apply force to such drilling
machine when connected thereto,
bore wall engaging means concentric piston and cylinder means for
applying axial force to said mandrel incluidng a piston connected
to said mandrel and a cylinder within which said piston is axially
slidably disposed,
cylinder anchor means for releasably anchoring said cylinder to the
wall of an earth bore,
spline means for preventing relative rotation of said mandrel and
cylinder while allowing relative axial motion thereof, and
mandrel anchor means for releasably anchoring said mandrel to the
wall of an earth bore,
each of said anchor means including bore wall engageable means
extending radially outwardly beyond the outer periphery of said
mandrel even when said anchor means is released from bore wall
engaging position, whereby said anchor means serve also as guide
means for said mandrel,
said releasable anchor means being disposed at opposite ends of
said barrel and cylinder means.
8. Apparatus according to claim 7,
said cylinder anchor means being connected to said cylinder at the
end thereof nearest said inner end of the mandrel,
said mandrel anchor means being connected to said mandrel at the
side of said piston and cylinder means nearest the outer end of
said mandrel.
9. Apparatus according to claim 8 wherein said mandrel is tubular
providing
fluid passage means to supply pressure fluid from the outer end of
the mandrel to a drilling machine connected to said inner end of
said mandrel,
each of said anchor means including return fluid passage means to
conduct past said anchor means exteriorly of said mandrel pressure
fluid returning from such drilling machine between the force
applicator and an earth bore therearound,
said piston and cylinder means lying between said anchor means and
spacing them apart at all times, thereby assuring that said return
fluid passage means in one anchor means is not blocked by the bore
wall engaging means of the other anchor means when said mandrel
moves relative to said cylinder.
10. Apparatus according to claim 9,
each of said anchor means including a barrel around the mandrel,
means sealing between the barrel and mandrel at positions spaced
apart axailly of the mandrel forming between said seals and said
barrel and said mandrel a chamber,
each bore wall engageable means of each of said anchor means
comprising a shoe mounted in a window in the barrel of said anchor
means and projectable radially outwardly by pressure fluid within
the chamber of said anchor means,
said force applicator further including a manifold connected to the
outer end of said mandrel anchor means providing means to connect
the force applicator to means for separately supplying pressure
fluid to each of said anchor means, the piston and cylinder means
on both sides of said piston, and to a drilling machine connected
to the inner end of said force applicator.
11. Apparatus according to claim 10,
said mandrel being also connected to the outer end of the barrel of
said mandrel anchor means and providing the outermost of one of
said seals between said mandrel and said mandrel anchor means.
12. Apparatus according to claim 11,
said manifold including a first fluid passage connected at its
inner end with the outer end of said mandrel in communication with
said fluid passage means to supply pressure fluid to a drilling
machine connected to said one end of the mandrel,
said manifold further including a second fluid passage directly
connected at its inner end with the chamber of said mandrel anchor
means,
said manifold further including third, fourth and fifth fluid
passages connected to conduits in said mandrel leading to said
cylinder anchor means and to said piston and cylinder means on
opposite sides of said piston.
13. Apparatus useful in earth boring, said apparatus comprising a
force applicator including
a mandrel having means at one end thereof for making connection at
least indirectly with a drilling machine, said one end constituting
the inner end of the mandrel and the opposite end of the mandrel
constituting the outer end of the mandrel,
said mandrel providing means to apply force to such drilling
machine when connected thereto,
piston and cylinder means for applying axial force to said mandrel
including a piston connected to said mandrel and a cylinder within
which said piston is axially slidably disposed,
cylinder anchor means for releasably anchoring said cylinder to the
wall of an earth bore,
spline means for preventing relative rotation of said mandrel and
cylinder while allowing relative axial motion thereof, and
mandrel anchor means for releasably anchoring said mandrel to the
wall of an earth bore,
said mandrel being tubular providing fluid passage means to supply
pressure fluid from the outer end of the mandrel to a drilling
machine connected to said inner end of the mandrel,
each of said anchor means incluidng a barrel around the mandrel,
means sealing between the barrel and mandrel at positions spaced
apart axially of the mandrel forming between said seals and said
barrel and said mandrel a chamber,
each of said anchor means further including bore wall engageable
means comprising a shoe mounted in a window in the barrel of said
anchor means and projectable radially outwardly by pressure fluid
with the chamber of said anchor means,
said force applicator further including multipassage means for
separately supplying pressure fluid to each of said anchor means
and to the piston and cylinder means at each side of said
piston,
flexible hose means connected at one end to the outer end of said
force applicator and including first, second, third, fourth, and
fifth channels, the first of said five channels communicating with
said fluid passage means to supply pressure fluid to a drilling
machine connected to the force applicator, and said second, third,
fourth and fifth channels communicating respectively via said
multipassage means with said two anchor means and the piston and
cylinder means on opposite sides of the piston thereof,
pressure fluid supply and control means connected to the other end
of said hose means for selectively supplying pressure fluid to said
channels as desired,
said pressure fluid supply and control means including a first
source of pressure fluid for supplying drilling fluid to said first
channel and a second source of pressure fluid for supplying
hydraulic fluid to the remainder of said channels,
said pressure fluid supply and control means further including
a first valve unit selectively to connect one of said second and
third channels to said second source of pressure fluid and
disconnect the other therefrom and
a second valve unit selectively to connect one of said fourth and
fifth channels to said second source of pressure fluid and
disconnect the other therefrom.
14. Apparatus according to claim 13, said pressure fluid supply and
control means including means independently to regulate the
pressure of fluid supplied to each of said fourth and fifth
channels.
15. Apparatus according to claim 14 wherein said first valve is a
three position valve in a center position of which both of said
second and third channels are connected to said second source of
pressure fluid thereby to insure that shifting the condition of the
apparatus from that in which an anchor means is set to that in
which the other anchor means is set, one of said anchor means is
always set.
16. Apparatus useful in earth boring including a force applicator
comprising a tubular mandrel, a cylinder around the outside of the
mandrel, a piston affixed to the mandrel slidable in the cylinder,
two barrels around the mandrel, one barrel being connected at one
end to one end of the cylinder, the other barrel being connected at
one end to the mandrel at the opposite end of said cylinder from
said first barrel, spline means connecting said mandrel and
cylinder, hydraulically actuatable shoes carried by each barrel,
first conduit means inside said mandrel extending from a port in
said mandrel inside said first barrel through said cylinder and
second barrel to the end of said mandrel, second conduit means
extendng inside said mandrel from said end of the mandrel to a port
in the mandrel communicating with said cylinder on one side of said
piston, third conduit means extending inside said mandrel to a port
in the mandrel communicating with said cylinder on the other side
of said piston, the mandrel being otherwise clear of conduits
leaving a passage means therethrough for communication with a
drilling machine when connected to the other end of the mandrel,
and passage means communicating with the interior of said second
barrel.
17. Apparatus according to claim 16 including a manifold connected
to the first said end of the mandrel for connecting multipasage
hose means to the three conduits in the mandrel and said passage
means in the mandrel and said passage means communicating with the
interior of the second barrel, said manifold also providing means
by which said second barrel is connected to the mandrel as
aforesaid, and said passage means communicating with the interior
of said second barrel being formed in said manifold.
18. Apparatus useful in earth boring including a mandrel, a bore
around the outside of the mandrel, a manifold which at one end
provides means mechanically connecting one end of the barrel to one
end of the mandrel, hydraulically extendable bore wall engaging
means carried by the barrel, first fluid passage means through the
manifold connecting the space inside the barrel outside the mandrel
with the other end of the manifold, second fluid passage means
through the manifold connecting the interior of the mandrel with
said other end of the manifold, and means at said other end of the
manifold for connecting said fluid passage means with a flexible
hose bundle.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to earth boring and more particularly to a
force applicator for axially loading a drill bit, especially an
in-hole motor driven drill bit used in boring horizontal vent holes
in mining for coal.
2. Description of the Prior Art
Coal bed vent holes have been drilled with auger bits. After the
hole exceeds several hundred feet in length difficulty is
experienced in maintaining directional control. The use of an
in-hole drilling machine has been suggested to eliminate the need
for transmitting torque the length of the drill stem. However, it
was still necessary to use the drill stem to transmit axial forces
to load the bit. In drilling oil wells it is known to provide
in-hole bit loading means, as shown for example in U.S. Pat. Nos.
3,088,532 issued May 7, 1963 on the application of J. M. Kellner
and 3,298,449 issued Jan. 17, 1967 on the application of W. R.
Bachman et al. Automatic valve means for such apparatus is shown in
U.S. Pat. No. 3,105,561 issued Oct. 1, 1963 on the application of
J. M. Kellner.
In the application of said Jackson M. Kellner filed
contemporaneously herewith, Ser. No. 189,844, filed Oct. 18, 1971,
now abandoned, and the copending continuation thereof application
Ser. No. 351,629 filed Apr. 16, both entitled FORCE APPLICATOR, an
in-hole force applicator is disclosed in combination with an
in-hole motor driven bit for effecting better direction control in
the drilling of horizontal earth bores. The tubular mandrel for
supplying fluid to the in-hole motor driven bit is provided with a
piston connected to the mandrel which moves in a cylinder that is
connected to the mandrel by spline means. Fluid is applied to the
cylinder to move the piston or cylinder in or out as desired.
Releasable anchor means are connected to the cylinder and mandrel
to anchor one or the other to the bore wall when the other or one
is to be forced in or out. The mandrel anchor means is disposed
between the in-hole motor driven bit and the piston and cylinder
means. A guide means in the form of a centralizer or stabilizer is
connected to the mandrel axially outward from the piston and
cylinder means.
According to one form of the apparatus disclosed in said
contemporaneous Kellner application a plurality of flexible fluid
conduits supply fluid to the two sides of the piston and cylinder
means and to the two releasable anchor means and to the in-hole
motor driven bit. The guide means body serves also as a manifold
for connecting the flexible conduits to the fluid conduits of the
force applicator. The plurality of conduits extend out to the open
end of the bore hole where they are wound on motor driven reels or
winches. Out-of-hole hydraulic control means is provided for
manually or automatically supplying fluid to the desired in-hole
means for effecting inward or outward travel of the mandrel or
cylinder.
SUMMARY OF THE INVENTION
The present invention is upon improvement upn the prior conceived
invention disclosed in the aforesaid contemporaneous application of
Jackson M. Kellner.
According to the present invention there is provided a force
applicator similar to that of the above described Kellner force
applicator but wherein the mandrel anchor is disposed axially
outward of the piston and cylinder means where, when in the unset,
i.e. disengaged or retracted, condition it will function as a guide
means, thereby eliminating the need for separate guide means at
this position along the mandrel and shortening the overall length
of the apparatus for any given stroke. In addition, such
positioning of the mandrel anchor means makes it unnecessary to
transmit fluid for such anchor means through the rest of the force
applicator. This also simplifies the construction of the hose
connection manifold which serves also as means to connect the
mandrel to the barrel of the mandrel anchor means. Further in
accordance with the invention the flexible conduits supplying fluid
to the force applicator may be bonded into a single multiple fluid
passage flexible conduit. Improved reeling means and hydraulic
control means are provided.
BRIEF DESCRIPTION OF THE DRAWINGS
For a detailed description of a preferred embodiment of the
invention and modifications thereof reference will now be made to
the accompanying drawings (FIGS. 3 thru 16 are substantially full
size and to scale for an exemplary tool) wherein:
FIG. 1 is a semi-schematic view showing a vertical section through
a horizontal earth bore with apparatus according to the invention
disposed therein shown in elevation and in section;
FIG. 2 is a schematic view illustrating an inhole rotary drilling
machine with which the subject invention may be used;
FIGS. 3, 4, 7, 10 and 11 together form an axial section through a
force applicator according to a preferred embodiment of the
invention;
FIGS. 5, 6, 8, 9, 12, 13, 14, 15, 16 are transverse sections taken
through the force applicator shown in the preceding drawings, such
sections being taken on the planes indicated in said preceding
drawings;
FIG. 17 is a perspective view showing out-of-hole apparatus used in
conjunction with the in-hole apparatus shown in the preceding
drawings, said in-hole apparatus also being shown being launched
into the hole;
FIG. 17A is a sectional view through the hose 87; and
FIGS. 18 and 19 are schematic views showing hydraulic systems
useful in the out-of-hole apparatus.
As is apparent from the sectioning of the drawings, all parts are
made of steel unless otherwise indicated or stated.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In this patent specification, unless the context indicates
otherwise, the term inward is used to denote the axial direction
toward the closed end of the bore hole and the term outward is used
to denote the axial direction away from the closed end of the
hole.
Since this application discloses improvements on the construction
disclosed in the aforesaid contemporaneous application of Jackson
M. Kellner, the disclosure thereof is incorporated herein by
reference for the disclosure and description of various details of
the present construction which are the same as those of the
construction disclosed in said contemporaneous Kellner application
thereby avoiding repetition.
Referring now to FIG. 1, there is shown an earth bore 51. The term
"earth" is here and in the claims used in a broad sense to cover
all materials of which the planet Earth is formed; it will be
understood that frequently the earth will be coal. At the inner end
of the earth bore is a drill bit 53 connected to the rotary
drilling machine 57. The non-rotating part 59 of the drilling
machine is connected to mandrel sub 61. The sub 61 is in turn
connected to mandrel 63 of force applicator 64.
The mandrel, which is made up of a number of tubular sections,
includes a spline section 65 which carries an externally fluted
sleeve 67. Sleeve 67 travels axially inside spline tube 69, the
latter being internally fluted. Tube 69 and sleeve 67 provide
spline means 71 which allows the mandrel to move axially relative
to the tube (and parts connected to the tube) but prevents relative
rotation between the mandrel and the tube (and parts connected to
the tube).
The tube 69 is connected to cylinder anchor means 73, the latter
being shown in set, i.e. expanded or bore wall engaging position,
the condition when the force applicator is used to apply force to
the drilling machine 57. The anchor means in turn is connected to
cylinder 77. The mandrel 63 continues on from the spline section 65
thereof through cylinder anchor means 73 into cylinder 77 where its
piston rod section 79 is provided with a piston 81. Piston 81
reciprocates in cylinder 77 and together the piston and cylinder
form piston and cylinder means 83.
The piston rod section of the mandrel extends outwardly beyond
cylinder 77 and connects to mandrel anchor and guide means 85. The
anchor and guide means in turn connects to flexible hose line 87
which extends out the open or outer end of the earth bore. A guide
funnel 91 is disposed in the open end of the earth bore.
The hose line 87 is either a bundle of five separate hoses or is a
single hose that includes five fluid passageways. The hose line 87
connects into a manifold provided by the body of anchor and guide
means 85. The fluid from hose 87 is used to supply pressure fluid
to the two anchor means and the two sides of the piston and
cylinder means and to the rotary drilling machine, being conducted
via the manifold and the mandrel and a number of conduits inside
the mandrel.
The hose 87 connects outside the hole to one or more sources of
fluid under pressure (not shown in FIG. 1), such as water, mud,
gas, air, or oil. The connection is such as to maintain fluid
connection while allowing advance and retraction of the drilling
machine and bit into and out of the hole, e.g. a swivel connection
to a hose reel.
A rotary drilling machine with which it is contemplated that the
force applicator is to be used is one known as a Dyna-Drill.
Apparatus of this type is shown in various publications. See U.S.
Pat. Nos. 2,898,087 and 3,112,801, and Dyna-drill Handbook
published 1970 by Dynadrill Div. of Smith Autl., Inc. Such a rotary
drilling machine is shown schematically in FIG. 2, which is based
on the illustration at the right on page 1,870 of the 1970-71
edition of the Composite Catalogue of Oil Field Equipment and
Service. As there described, the drilling machine 57 includes a
motor 101 which is essentially a three-stage Moyno Pump run in
reverse and comprising about one-half of the total 25 foot length
of the tool. The motor consists of an obround-shaped spiral passage
103 containing a solid steel rotor 105 which moves eccentrically.
Shaped in a regular-recurring wave form, this rotor is free to move
at the outer end 107, while the inner end 109 is attached to one
end of a connecting rod 111. The other end of the connecting rod is
attached to tubular drive shaft 113. Thrust bearings 115, 117 on
the drive shaft prevent it from moving axially inside housing
extension 119. When water is pumped under pressure into housing
connection 121 at the outer end of the tool, the pressure closes
spring loaded slide dump valve 123, closing port 125. The water is
thus directed down the annulus 127 between the rotor 105 and the
rubber lined spiral passageway 103. In order for flow to occur, the
rotor is displaced and turned by the pressure of the fluid column,
thus rotating the connecting rod 111, the tubular drive shaft 113
and the bit sub 129. The latter is connected to the inner end of
the drive shaft where it extends out beyond housing extension 119.
The water, or other fluid, leaves the annulus 127 by entering port
131 in the tubular drive shaft. The water then passes through the
drive shaft, bit sub, and diamond bit 53, and leaves bit 53 via
passages 133, where it enters the bore hole. The water leaving the
drill bit passes back to the open end of the hole outside the
drilling machine, the force applicator, and the hose connected
thereto, carrying away the detritus and cooling the bit. It will be
seen that although the drive shaft 113 rotates relative to the tool
housing 135, inward force applied axially to the housing through
connection 121 is transferred to the drive shaft 113 through the
thrust bearings 117 and thence to the bit 53. Likewise, outwardly
directed force applied to housing 135 is transferred to the drive
shaft through thrust bearing 115 and thence to the bit.
Referring now to FIGS. 3 et seq., there are shown the details of a
force applicator embodying the invention. Beginning with FIGS. 3-6
there is shown in detail the spline means 71 and cylinder anchor
means 73 shown schematically in FIG. 1. At the right hand side of
FIG. 3 is shown the sub 61 (see also FIG. 1) for making connection
with the drilling machine 57. The sub 61 is screwed onto pin 516.
Pin 516 is welded on to the inner of a pipe 518. The outer end of
pipe 518 is welded to threaded box 520 (FIG. 4). Together, the pin
516, tube 518, and box 520 form the spline section 65 (FIG. 1) of
the mandrel of the force applicator.
Externally fluted sleeve 67 is pressed or shrunk onto pipe 518.
Disposed around spline section 65 of the mandrel is tube 69, which,
as best shown in FIG. 5, is internally fluted correlative to fluted
sleeve 67. There is thus provided spline means 71 which allows
relative axial motion of the mandrel and tube while preventing
relative motion therebetween. The flutes on the sleeve 67 leave
axially extending ribs 519 therebetween which fit between the ribs
521 of fluted tube 69. The ribs 519 are provided at their outer
peripheries with channels 523 to permit solid materials to be
flushed more easily out of the spline means 71.
To the inner end of tube 69 (FIG. 3) is screwed a coupling 522
which in turn is screwed to guard cup 524. The guard cup 524 and
sub 61 cooperate to provide stop means limiting relative axial
travel of the mandrel and tube, end 525 of the guard cup being
engageable with end 62 of sub 61.
Within coupling 522 is pressed or shrink fitted a seal ring 526
having an annular rubber seal 528 bonded to the inner periphery
thereof. The spline section 65 of the mandrel of the force
applicator extends axially through seal ring 562 in sealing
engagement with seal 528.
As shown in FIG. 4, the box 520 is screwed onto pin 530 which forms
the inner end of the piston rod section 79 (see also FIG. 1) of the
mandrel of the force applicator. Section 79 further includes pipe
532 to which pin 530 is welded. Pipe 532 extends axially slidably
through and in sealing engagement within annular rubber seal 534
bonded to the interior of the combined barrel head and cylinder
head formed by seal ring 536. The latter is press or shrink fitted
inside coupling 538.
A barrel 540 is screwed at one end to coupling 538 and at the other
end to spline tube 69. There is thus formed a chamber 543 between
the mandrel and the barrel and spline tube, the chember being
sealed at its ends by seals 534 and 528 of seal rings or barrel
heads 536 and 526. Pressure fluid may be conducted into and out of
the chamber 543 through mandrel port 541, the latter being
connected to conduit 546 which extends outwardly to the outer end
of the force applicator where it connects to a pressure fluid
conducting hose (see infra).
Referring now particularly to FIGS. 5 and 6, the barrel 540 is
provided with a plurality of windows 542 spaced equally apart
around the circumference thereof. Disposed in each window for
radial in and out movement is a bore wall engageable shoe 544. Each
shoe is provided with a plurality of teeth 545 or other means for
preventing axial and circumferential slippage of the shoe when
engaged with a bore wall.
Each shoe is sealed to its window by an elastomer (rubber) seal
548, bonded to the window and to the sides and inner periphery of
the shoe, the seals 548 merging to form a continuous sleeve around
the tube 532. The seals normally hold the shoes as shown in the
unset or retracted position and have sufficient resilience to allow
the shoe to be projected radially outwardly into bore wall engaging
or set position when fluid pressure in chamber 544 exceeds that
outside the force applicator. Upon equalization of such pressures,
the resistence of the seals retracts the shoes to the disengaged or
retracted position shown.
The sides 549 of the barrel 540 are flattened to provide fluid
passage means between the barrel and the wall of the earth bore in
which the apparatus is used. Further details of the operation of
such wall anchor means are set forth in the aforementioned Kellner
and Bachman et al. patents.
Referring now to FIGS. 7-9 there are shown the details of the
piston and cylinder means 83 shown schematically in FIG. 1.
Cylinder 77 is screw connected at 550 to coupling 538, by which
means it is connected to barrel 540 and spline tube 69 (FIG. 4).
The outer end of cylinder 77 is connected by threaded coupling 552
to guard cup 554.
Reverting for a moment back to FIG. 3, as previously mentioned the
outer end 525 of guard cup 524 cooperates with the inner end 62 of
sub 61 to provide stop means limiting relative axial travel of the
mandrel and spline tube 69. Since the spline tube is connected to
anchor barrel 540, this stop means also limits relative axial
travel of the mandrel and the anchor barrel in one direction.
Relative axial travel of the mandrel and the anchor barrel 540 in
the opposite direction is limited by stop means comprising guard
cup 554 and barrel head 556 (FIG. 10) of the mandrel anchor and
guide means 85. The end 558 of the guard cup 554 engages end 560 of
barrel head 556 to limit such motion. Within the limits of relative
axial motion of the mandrel and cylinder anchor barrel just
described, mandrel port 541 (FIG. 4) is always in communication
with chamber 543.
Referring once more to the piston and cylinder means 83 shown in
FIGS. 7-9, pipe 532 of the piston rod section 79 of the mandrel of
the force applicator extends axially through cylinder 77 and is
axially slidably sealed thereto by seals 534 and 562, respectively
bonded to seal rings 536 and 564. The latter are press or shrink
fitted in couplings 538 and 552 and together with the seals carried
thereby provide cylinder heads. In the space between the cylinder
heads travels piston 81 which is secured to pipe 532. Part of the
drawing is broken off between cylinder heads 536 and 564; the
length of cylinder 77 and pipe 532 actually will be about the same
as the length of the spline tube and the mandrel section
therewithin, and the same as the length of the cylinder anchor
barrel and the mandrel section therewithin, so as to provide equal
stroke for the spline means and the cylinder anchor means and the
piston and cylinder means. The stop means previously described
which limit relative axial travel of the mandrel and cylinder
anchor barrel also prevent the piston from contacting the cylinder
heads and prevents the spline sleeve 67 from striking the barrel
540 (FIG. 4) and the barrel head 526 (FIG. 3).
Piston 81 comprises annular body 566 which is secured to the tube
532 by collet clamp 568, the latter being activated by compression
ring 570. Ring 570 is screwed into body 566. Ring 566 is sealed to
tube 532 by rubber O-body 572. The exterior of piston body 566 is
bonded to rubber seal 574. This construction is described in
greater detail in the aforementioned contemporaneous Kellner
application to which reference may be made if need be.
Pressure fluid conduits 605, 607 are connected to mandrel ports
609, 611 whereby pressure fluid can be supplied to and released
from the spaces 613, 615 at the inner and outer ends of the piston
and cylinder means on the opposite sides of the piston. The ends
617, 619 of the piston body 566 and ring 570 are spaced radially
outwardly from the mandrel so that ports 609, 611 can be placed
thereunder without being blocked; this allows the ports to be
placed that much closer together, to increase the effective stroke
of the piston and cylinder means. Wrench sockets 618, 620 are
provided in the ends 617, 619 to facilitate screwing ring 570 into
body 566.
Pipe 532 of the piston rod section of the mandrel extends outwardly
from guard cup 554 to the hose connection, mandrel anchor and guide
means 85 shown in detail in FIGS. 10-16.
Referring particularly to FIG. 10, pipe 532 is welded at its outer
end to manifold 630. Mandrel anchor barrel 632 is screwed at its
outer end to manifold 630 in fluid tight relationship and is
screwed at its inner end to barrel head 556, also in fluid tight
relationship. Head 556 is sealed to pipe 532 by rubber O-ring 634.
There is thereby defined between barrel 632, pipe 532, seal 634,
and manifold 630 a chamber 636.
There are a plurality of windows 638 in barrel 632 equally spaced
apart circumferentially around the barrel. Within each window is
disposed a bore wall engageable shoe 640. Each shoe is sealed to
its window by an elastomer (rubber) seal 642 bonded to the window
and to the sides and inner periphery of the shoe, the seals being
connected to their radially innermost portions provide a continuous
sleeve around pipe 532. Application of fluid pressure inside
chamber 636 exceeding that outside the force applicator causes the
shoes to be moved outwardly into bore wall engaging or set
position; equalization of the pressures causes the elastic seals to
retract the shoes back to the position shown. Even in retracted
position the shoes are sufficiently close to bore wall engagement
to serve as centralizing or guiding means for the mandrel of the
force applicator. During drilling the mandrel is guided by the
seals of the barrel heads of the cylinder anchor barrel and the
seals of the cylinder heads of the piston and cylinder means, and
by the piston moving in the cylinder of the piston and cylinder
means, and by the ribs 519 of the spline sleeve moving in the
channels 525 of the spline tube, and by the shoes of the mandrel
anchor barrel moving in the bore hole.
The flat sides 642 (FIG. 12) of the body 632 of the mandrel anchor
provide fluid passages between such body and the bore wall. The
shoes 640 are provided with teeth 644 which provide means to
prevent axial and circumferential slippage between the mandrel
anchor barrel and bore wall when the shoes are in the extended or
set position.
For supplying pressure fluid to the pipe 532 connecting to the
Dyna-Dril or other drilling machine and to supply pressure fluid to
the conduits 605, 607 leading to the inner and outer spaces of the
piston and cylinder means, and to chamber 636 of the mandrel anchor
means and to conduit 546 leading to the cylinder anchor means, the
manifold 630 is provided with five fluid passages 700, 702, 704,
706 and 708 as best shown in FIGS. 15 and 16. Passage 700 is in
direct communication with the interior of tube 532 via counterbore
710, as shown in FIG. 10.
Referring to FIGS. 10 and 15, passage 702 communicates via radial
passage 712 with axially extending passage 714 that connects to
conduit 605 which is received in a counterbore at the end of
passage 714. Similarly, passage 704 communicates via transverse
passage 716 with axially extending passage 718 which connects to
conduit 607 which is received in a counterbore at the end of
passage 718.
Passage 706 communicates via radial passage 720 (FIG. 14) with
axially extending passage 722 which is connected to conduit 546,
the latter being received in a counterbore in passage 722.
Passage 708 (FIGS. 10 and 14-16) connects directly with chamber 636
of the mandrel anchor means.
Referring now to FIGS. 11 and 16, the outer ends of manifold
passages 700, 702, 704, 706, 708 are connected to hose connection
coupling means 724, 726, 728, 730, 732. The apparatus is thus
adapted for operation by connection to five separate flexible,
pressure-fluid hoses extending through the earth bore to the outer
end of the bore. To eliminate the possibility of tangling the hoses
and to facilitate reeling and winching at the bore face, it is
preferred to bundle them together to form a single line 87 as shown
in FIGS. 1 and 17. It will be understood that this can be
accomplished simply by helically wrapping a tape around the five
hoses in order to hold them together in a single bundle, or a
prefabricated multipassage hose can be used.
Referring now to FIG. 17, there is shown the in-hole apparatus as
it is being launched into the earth bore through guide funnel 91
from suitable out-of-hole apparatus. The out-of-hole apparatus
includes a four wheeled trailer cart 798 on which is rotatably
mounted reel 800 on which the hose line 87 is wound by suitable
means, e.g. with level wind means as disclosed in the aforesaid
contemporaneously executed Kellner application. The line 87 passes
over suitable guide pulleys (not shown) to power winch 802. After
several turns around winch 802 sufficient to establish the
frictional engagement needed for pulling on the hose line with the
desired force, the hose line 87 connects to the hose coupling end
of the force applicator 64.
Whe not in use the force applicator is carried in a storage and
launch tube 804 affixed to the side of the cart. When it is desired
to use the apparatus drilling machine 57 is placed inside an
extension tube 806. The drilling machine is then connected to the
force applicator 64 by sub 61 and the extension tube 806 is
connected to storage and launch tube 804 by coupling 808. The cart
798 is positioned to place the end of extension tube 806 against
guide funnel 91. With the cart 798 held stationary the force
applicator can then be used to load the drilling machine to start
the earth bore, purchase being obtained from the tubes 804 and 806
as the force applicator moves therethrough into the earth bore.
The end of hose line 87 is connected through suitable swivel means,
not shown, which may be like that disclosed in the aforesaid
contemporaneously executed Kellner application, to pressure fluid
supply and control means carried by cart 798. For example, water
emerging from the drill bit 53 and returning to receiving tank 810
through the earth bore 53 can be pumped out via pipe 812 by an
electric motor driven pump (see FIG. 19) mounted in console 814.
The water is then delivered to the flow passage of hose line 87
that delivers fluid to the drilling machine 57. The details of this
could be the same as in the aforementioned contemporaneous Kellner
application. Also mounted in console 814 is an air motor driven
pump for hydraulic fluid together with suitable controls for
supplying the hydraulic fluid to the two anchor means and to the
piston and cylinder means of the force applicator. The details of
such control and hydraulic fluid supply means are shown in FIG. 18.
The symbols used in FIG. 18 are those of the United States of
America Standards Institute, e.g. as illustrated and disclosed in
the 1968/69 Fluid Power Handbook & Directory pages
A/36-A/46.
Referring now to FIG. 18 there is shown a piston pump 900 driven by
air motor 902 from a suitable source of compressed air (not shown).
The pump intake is connected to hydraulic fluid (oil, or preferably
water because of its lower viscosity) tank 904 by line 906 through
filter 908 and discharges through line 910 to accumulator 912.
Line 910 also is connected through line 914 and variable choke 916,
line 917 and manual dump valve 918 to branch lines 920, 922, with
pressure gage 924 and relief valve 926 branching off from line
917.
Branch lines 920, 922 are connected to one-way pressure control
means 928, 930, each comprising a check valve 932, 934 in parallel
with a spring loaded valve 936, 938. Valve 936 is normally open but
closes chokes down to prevent downstream pressure from increasing
above a set pressure. Valve 938 is normally closed and does not
open until upstream pressure reaches a certain value, whereupon
downstream and upstream pressure become equal. A pressure gage 940
is connected to pressure control means 928 downstream from valve
936.
Pressure control means 928 is connected through line 942 to air
actuated, spring centered, three position valve 944 and manually
reversing valve 946 to mandrel anchor means 73, or, if the
reversing valve 946 is moved to the opposite position from that
shown, to cylinder anchor means 85. Tank 904 is connected through
air operated three position valve 944 and reversing valve 946 to
cylinder anchor means 85, or, if the reversing valve 946 is moved
to the opposite position from that shown, to the mandrel anchor
means 73.
If three position valve 944 is moved to the right from the position
shown, in its mid position it will connect both anchor means 73, 85
to hydraulic line 942 and block off the connection thereof to tank
904. Further movement of valve 944 to the right will reverse the
connection of the anchor means with respect to tank 904 and
hydraulic line 942 from the position shown in the drawing. Valve
944 is moved from left to right and back again by air pressure
through lines 950, 952 which are connected through one way time
delay (e.g. 5 sec.) means 954, 956 and manual reversing valve 958
to lines 960, 962. Line 960 is connected to a source (not shown) of
air under pressure. Line 962 is connected to atmosphere.
The one-way time delay means 954, 956 comprise adjustable throttle
valves (needle valves) 953, 955 in series with air chambers 957,
959, the valves being by-passed by check valves 951, 961, whereby
fluid can flow freely without time delay in the direction the check
valves open but must fill the chambers 957, 959 through chokes 953,
955 before building up full pressure downstream when flowing in the
other direction.
Air is also conducted from time delay means 954, 956 to air
operated hydraulic reversing valve 964. Valve 964 controls flow
through line 963 to tank 964 and from line 966 leading to time
delay means 930. Lines 966 and 963 connect through valve 964 to
hydraulic lines 968, 970, which in turn connect through one-way
pressure regulator means 972, 974 to outer and inner spaces 615,
613 on opposite sides of piston 81 carried on tube 532 inside
cylinder 77. The one-way pressure regulator means 972, 974 comprise
pressure relief valves 971, 973, respectively in parallel with
check valves 975, 977. Pressure gages 976, 978 connected to spaces
615, 613 indicate which space is pressurized.
The hydraulic fluid supply and control means provided by the
apparatus shown in FIG. 18 is in the deactivated position due to
dump valve 918 being in the dump position. In that position both
lines 942 and 966 are connected to discharge to tank 904 through
check valves 932 and 934 and dump valve 918. This means that
whichever anchor means 73, 85 is connected to line 942 through
valves 944 and 946 is dumped to tank 904; likewise, whichever one
of spaces 615, 613 of the piston and cylinder means 83 is connected
to line 966 through valve 964 is also dumped to tank 904.
In addition, line 917 from the accumulator is also dumped to tank
904 through valve 918. The one of the anchor means not connected to
line 942 is also dumped to tank 904, through line 990, and the one
of the spaces 615, 613 of the piston and cylinder means 81 that is
not connected to line 966 is also dumped to tank 904, through line
963. Therefore, with this position of dump valve 918, the positions
of cycle valve 958 and reverse valve 946 are immaterial, for the
apparatus is fully deactivated.
To operate the apparatus the dump valve 918 is moved to the right.
This connects hydraulic line 917 to lines 920, 922. With both the
cycle valve 958 and the reverse valve 946 in the "drill" positions
as shown, hydraulic fluid is supplied to cylinder anchor means 73
to set it in bore wall engaging position. As soon as the pressure
builds up, valve 938 opens and hydraulic fluid is applied to the
outer space 613 of the piston and cylinder means 81 to apply force
to the drilling machine.
When the stroke limit of the force applicator is reached, the
operator will be apprised of that fact by a fall in pressure at the
gate 992 (FIG. 19) on the outlet of electric motor driven pump 994
that picks up water from pipe 812 and delivers it to the drilling
machine. Such a fall occurs because the drilling machine is no
longer loaded.
The operator then moves cycle valve 958 to the left or "reset"
position. This connects time delay means 954 to air vent 962 and
allows the centering springs on valve 944 to move it to the right
to centered position. At this time both the cylinder and mandrel
anchor means 73, 85 are set. After the preset time delay, time
delay means 956 connects air pressure line 960 to lines 998 and 950
to move valve 964 to the left and valve 944 to the right. Cylinder
anchor means 73 is thereby dumped and hydraulic line 966 is thereby
connected to the inner space 613 of the piston and cylinder means
to move the cylinder 77 to a new position farther inward in the
earth bore. This will only take a minute, more or less, depending
on the capacity of the hydraulic pump 900 and the volume of
cylinder 77. The operator will be apprised of the fact that the
stroke limit has been reached by a rise in pressure at gauge
978.
To resume drilling the operator moves cycle valve 958 to the right.
Air line 950 is thereby dumped to atmospheric vent 962, allowing
the springs of valve 944 to move it to its center position. Both
the cylinder and piston anchor means 73, 85 are thereby connected
to hydraulic line 942, setting the cylinder anchor means in
addition to the already set mandrel anchor means 85. After the
predetermined time delay of time delay means 954, air pressure line
960 will be connected to lines 952 and 999, moving valves 944 to
the left and valve 964 to the right. This will cause mandrel anchor
means 85 to be connected to tank 904, retracting anchor means 85.
As soon as pressure in the hydraulic line 922 is sufficient to open
valve 938, hydraulic pressure fluid will be connected to outer
space 615 of the piston and cylinder means 83, and the drilling
machine will once more be loaded. The foregoing sequence can be
repeated as the apparatus alternately reaches the end of the
drilling stroke and then is reset.
If it is desired to remove the apparatus from the earth bore, the
operator has two options. He can move dump valve 918 to the left,
deactivating the piston and cylinder means and both anchor means.
The winch 802 can then be operated to pull the hose bundle 87 and
the force applicator 64 and the drilling machine 57 out of the
earth bore.
Alternatively the operator can move the reverse valve 946 to the
left or "retract" position. This will cause the mandrel anchor
means 85 to be set, rather than the cylinder anchor means 73, when
the cycle valve 958 is in the drill position. Therefore, when
hydraulic fluid pressure is applied to the outer space 615 of the
piston and cylinder means 83, the cylinder 77 is moved outwardly.
When it reaches its stroke limit as indicated by a rise in pressure
at gauge 976, the cycle valve is moved to the left to the reset
position. This causes mandrel anchor means 85 to be retracted and
cylinder anchor means 73 to be set, while hydraulic fluid pressure
is applied to inner space 613 of the piston and cylinder means 83.
The piston 81 of the piston and cylinder means is thereby moved
outwardly to retract the apparatus from the earth bore. When its
stroke limit is reached as indicated by a rise in pressure at gauge
978 the cycle valve is returned to the right or drill position.
By repeating the foregoing sequence, moving the cycle valve 958
back and forth as the stroke limits are reached, the apparatus is
retracted from the earth bore under its own power.
During withdrawal of the apparatus from the earth bore the water or
other pressure fluid supply to the drilling machine can be
maintained. Alternatively, it can be continued at a reduced
pressure by opening bypass throttle valve 1000 (FIG. 19) to a
greater or lesser degree. If desired, the pressure fluid to the
drilling machine can be shut off altogether by shutting down pump
994. This is accomplished by opening switch 1002 in the electric
line connecting electric motor 1004 to a suitable source of
electric power (not shown).
The apparatus is provided with a number of protective devices.
Pressure relief valve 1006 prevents excessive water pressure from
being supplied to the drilling machine. Pressure regulating valves
972, 974 limit the pressure applied to the piston and cylinder
means 83. Pressure regulating valve 936 limits the pressure applied
to the two anchor means. Pressure relief valve 926 limits the
pressure applied to the accumulator 912 and to the entire hydraulic
system.
The pressure fluid supply and control system of FIG. 18 can be
automated, if desired, in the same manner as described in detail in
the aforementioned contemporaneously executed Kellner application,
e.g. by including an out-of-hole pilot piston and cylinder means in
series with one of the lines 968, 970, and causing the motion of
the pilot piston rod to actuate cycle valve 958 as the piston and
cylinder means reaches the ends of its stroke.
While a preferred embodiment of the invention has been shown and
described, modifications thereof can be made by one skilled in the
art without departing from the spirit of the invention.
* * * * *