U.S. patent number 3,840,071 [Application Number 05/266,232] was granted by the patent office on 1974-10-08 for underwater connector for wellheads.
This patent grant is currently assigned to C. Jim Stewart & Stevenson, Inc.. Invention is credited to Hollis A. Baugh, Joseph L. Lemoine.
United States Patent |
3,840,071 |
Baugh , et al. |
October 8, 1974 |
UNDERWATER CONNECTOR FOR WELLHEADS
Abstract
An underwater connecting apparatus for subsea control systems
for wells drilled on the ocean floor and like areas. The connecting
apparatus includes at least two female receptacles, a male stinger
engageable in both receptacles and a spring mounting secured to one
of the receptacles for flexing attachment to a wellhead.
Inventors: |
Baugh; Hollis A. (Houston,
TX), Lemoine; Joseph L. (Houston, TX) |
Assignee: |
C. Jim Stewart & Stevenson,
Inc. (Houston, TX)
|
Family
ID: |
23013723 |
Appl.
No.: |
05/266,232 |
Filed: |
June 26, 1972 |
Current U.S.
Class: |
166/338; 166/344;
285/26 |
Current CPC
Class: |
E21B
33/038 (20130101) |
Current International
Class: |
E21B
33/03 (20060101); E21B 33/038 (20060101); E21b
007/12 () |
Field of
Search: |
;166/.5,.6 ;137/236
;285/26,29,131 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Sutherland; Henry C.
Assistant Examiner: Favreau; Richard E.
Attorney, Agent or Firm: Giller; Jefferson D. Weiler; James
F. Stout; William A.
Claims
What is claimed is:
1. A connector apparatus for connection to an underwater wellhead,
the wellhead having an upper detachable portion and a lower
stationary portion, including,
a. a first female receptacle secured to the lower stationary
portion of the wellhead,
b. a second female receptacle secured to the upper detachable
portion of the wellhead,
c. a male stinger engagable with both the first and second female
receptacles (a) and (b) respectively when inserted into said
receptacles, and
d. said engaging surfaces of the female receptacles (a) and (b) and
the male stinger (c) tapering downwardly and inwardly.
2. A connector apparatus for connection to an underwater wellhead,
the wellhead having an upper detachable portion and a lower
stationary portion, including,
a. a first female receptable secured to the lower stationary
portion of the wellhead,
b. a second female receptacle secured to the upper detachable
portion of the wellhead,
c. a male stinger engagable with both the first and second female
receptacles (a) and (b) respectively when inserted into said
receptacles,
d. at least one passageway in each of the female receptacles (a)
and (b), and
e. passageways in the male stinger (c), one end of each of the
passageways (d) mating for fluid communication with the passageways
(e) when the male stinger (c) is engaged with the female
receptacles (a) and (b), and
f. annular seal means around one of said passageways at its mating
end for forming a liquid-tight seal between the ends of said
passageways (d) and (e).
3. A connector apparatus for connection to an underwater wellhead,
the wellhead having an upper detachable portion and a lower
stationary portion, including,
a. a first female receptacle secured to the lower stationary
portion of the wellhead,
b. a second female receptacle secured to the upper detachable
portion of the wellhead,
c. a male stinger engagable with both the first and second female
receptacles (a) and (b) respectively when inserted into said
receptacles, and
d. locking means for releasably securing the male stinger (c) in
engagement with the second female receptable (b) wherein the
locking means includes,
i. a flange projecting from the second female receptacle (b),
ii. at least one lever pivotal about an axis member for engagement
with the flange (i) of the second female receptacle (b),
iii. a link pivotally attached to and for moving the lever (ii),
and
iv. piston means coacting with the link (iii) for moving said
link.
4. In an underwater wellhead apparatus having an upper detachable
portion and a lower stationary portion, the improvement
comprising,
a. a first female receptacle secured to the lower stationary
portion of the wellhead,
b. a second female receptacle secured to the upper detachable
portion of the wellhead,
c. a male stinger engagable with both the first and second female
receptacles (a) and (b) respectively when inserted into said
receptacles, wherein the engaging surfaces of the female
receptacles (a) and (b) and the male stinger (c) taper downwardly
and inwardly,
d. locking means for releasably securing the male stinger (c) in
engagement with the second female receptacle (b), and
e. spring mounting means for flexingly securing the first female
receptacle (a) to the lower stationary portion of the wellhead.
5. The invention of claim 4 where the spring mounting means
includes,
i. an outwardly extending flange secured to the first female
receptacle (a),
ii. a mounting ring secured to the lower stationary portion of the
wellhead, and
iii. bolt-guided spring means for flexingly connecting the flange
(i) to the mounting ring (ii).
6. In an underwater wellhead apparatus having an upper detachable
portion and a lower stationary portion, the improvement
comprising,
a. a first female receptacle secured to the lower stationary
portion of the wellhead,
b. a second female receptacle secured to the upper detachable
portion of the wellhead,
c. a male stinger engagable with both the first and second female
receptacles (a) and (b) respectively when inserted into said
receptacles,
d. locking means for releasably securing the male stinger (c) in
engagement with the second female receptacle (b),
e. spring mounting means for flexingly securing the first female
receptacle (a) to the lower stationary portion of the wellhead,
f. at least one passageway in each of the female receptacles (a)
and (b), and
g. passageways in the male stinger (c), one end of each of the
passageways (f) mating for fluid communication with the passageways
(g) when the female stinger (c) is engaged with the female
receptacles (a) and (b), and
h. annular seal means around one of said passageways at its mating
end for forming a liquid-tight seal between the ends of said
passageways (f) and (g).
7. In an underwater wellhead apparatus having an upper detachable
portion and a lower stationary portion, the improvement
comprising,
a. a first female receptacle secured to the lower stationary
portion of the wellhead,
b. a second female receptacle secured to the upper detachable
portion of the wellhead,
c. a male stinger engagable with both the first and second female
receptacles (a) and (b) respectively when inserted into said
receptacles,
d. locking means for releasably securing the male stinger (c) in
engagement with the second female receptacle (b), wherein the
locking means includes,
i. a flange projecting from the second female receptacle (b),
ii. at least one lever pivotal about an axis member for engagement
with the flange (i) of the second female receptacle (b),
iii. a link pivotally attached to and for moving the lever (ii),
and
iv. piston means coacting with the link (iii) for moving said link,
and
e. spring mounting means for flexingly securing the first female
receptacle (a) to the lower stationary portion of the wellhead.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
None.
BACKGROUND OF THE INVENTION
When an oil or gas well is drilled under bodies of water such as
lakes and oceans, the wells generally are completed by addition of
wellhead equipment having valves, blow-out preventers and the like
to control various functions of the wellhead. This equipment is
frequently positioned underwater thereby necessitating remote
control from the water's surface. The control lines are usually of
the hydraulic fluid type which must be capable of expeditious
connection and disconnection such as during emergencies or when
moving a water surface control vessel from one location to another.
Connector devices to carry out control functions are shown, for
example, in U.S. Pat. No. 3,486,556 issued Dec. 30, 1969 to Harry
L. Burgess and in references cited in that patent. A further
embodiment of a connector device is also shown in U.S. application
Ser. No. 79,504 filed Oct. 9, 1970 and entitled "Connector."
Generally speaking, these devices provide detachable control means
for connecting to and controlling underwater wells such as those
drilled for oil and natural gas. The connectors may be raised and
lowered as desired and, when secured to the equipment at the
underwater wellhead site, provide conduit means for transmitting
control fluids through underwater equipment such as a blow-out
preventer.
In connector devices such as that of U.S. Pat. No. 3,486,556, the
connector apparatus includes a receptacle having an opening therein
into which a tapered stinger is adapted to be removably telescoped,
and in which the receptacle and stinger have coacting fluid
passageways when the stinger is seated therein. Typical of the
conventional connector apparatus shown in such patent is the
provision of a protective shield together with means for aligning
the stinger for insertion into the receptacle to insure a proper
fluid-tight engagement between the stinger and receptacle.
While conventional connector devices have, in most cases,
functioned for the purpose intended, nevertheless the apparatus has
been rather expensive to machine and manufacture due to close
tolerances required for proper sealing relationships. In addition,
conventional connector apparatuses have required the use of locking
devices to maintain proper sealing engagement of the connector
apparatus with the wellhead which adds to the expense of the
equipment as well as its operation. Advantageously, the apparatus
of the present invention results in significantly reduced
manufacturing costs and facilitates locking of the connector
apparatus to the wellhead.
SUMMARY OF THE INVENTION
The present invention is of the type utilizing a tapered stinger
and receptacles wherein passageways extending through the stinger
terminate preferably in common planes so that a lengthy stinger
body is not necessary. Spring mounting means are secured to the
lower of two female receptacles for flexing attachment to a
stationary portion of the wellhead. The flexing ability of the
lower receptacle practically eliminates the possibility of damage
to the stinger and passageway seals during engagement and greatly
reduces the cost of manufacture.
An annular second or upper female receptacle is provided releasably
engaging the stinger above the lower female receptacle, the second
female receptacle being adapted so as to be fixedly secured to an
upper detachable portion of the wellhead. This arrangement adds
versatility to the connector apparatus in that the stinger portion
may be disconnected along with the second female receptacle member
when the upper portion of a wellhead is detached or disconnected
from the stationary part of the wellhead, or the stinger may be
disconnected and removed at will without any necessity of removing
the upper detachable portion of the wellhead. Locking means are
employed to interlock the stinger in the annular second female
receptacle to insure a fluid-tight fit.
It is, therefore, an object of the present invention to provide an
underwater connecting means for expeditious connection and
disconnection of control lines leading to underwater equipment such
as a wellhead.
A further object of the present invention is the provision of a
connector apparatus for connection to an underwater wellhead
wherein the apparatus includes a lower, first female receptacle,
spring mounting means secured to the female receptacle and adapted
for flexing attachment to the wellhead, an upper, second female
receptacle, and a male stinger engageable in both female
receptacles so as to provide hydraulic communication therewith.
Still a further object of the present invention is the provision of
a connector apparatus for connection to an underwater wellhead
having an upper detachable portion and a lower stationary portion
wherein the apparatus includes a first female receptacle, spring
mounting means secured to the female receptacle and adapted for
flexing attachment to the lower stationary portion of the wellhead,
an annular second female receptacle secured to the upper detachable
portion of the wellhead, and a male stinger engageable in the
female receptacles.
A still further object of the present invention is the provision of
such a connector apparatus wherein locking means are provided to
releasably secure the male stinger to the second female
receptacle.
Other and further objects, features and advantages will be apparent
from the following description of a presently preferred embodiment
of the invention, given for the purpose of disclosure and taken in
conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
Like character references designate like parts throughout the
several views of the drawings, which are as follows:
FIG. 1 is a schematic elevation view of a wellhead having a
connecting apparatus for remote control of wellhead functions from
a water surface vessel, the connector apparatus being shown in
duplicate in dotted outline, and
FIG. 2 is a partial elevation view partly in cross section showing
apparatus according to the present invention.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings, and particularly to FIG. 1, the
reference numeral 10 generally designates an underwater wellhead
apparatus having an upper detachable portion and a lower stationary
portion. The upper detachable portion is generally the equipment
shown in schematic attached to and positioned above a riser plate
12 while the lower stationary portion is that portion of the
wellhead below and to which is attached a stack plate 14. The upper
detachable portion of the wellhead will simply be referred to as
the "riser" and indicated generally by the reference numeral 16
while the lower stationary portion of the wellhead will be referred
to as the "stack" and will be indicated generally by the reference
numeral 18.
Shown secured to the wellhead 10 is a connector apparatus according
to the present invention and designated generally by the reference
character 20. An identical duplicate connector apparatus 22 is also
shown connected to the wellhead and which may serve in a stand-by
capacity if desired should the first connector apparatus 20 become
inoperative for any reason.
Continuing with respect to FIG. 1, the functions of the wellhead 10
are controlled remotely by a water surface vessel 24 via an
umbilical 26 connecting with the riser 16 of the wellhead. The
umbilical 26 provides fluid communication between the vessel 24 and
the wellhead 10 to in turn impart fluid to the connectors 20 and 22
as will be described hereinafter. Alternatively, umbilicals 28 and
30 may be provided for direct fluid communication between the
vessel 20 and connectors 22 and 20 respectively as will be
explained.
Referring now to FIG. 2, a connector apparatus 20 according to the
present invention is shown having a lower, first female receptacle
32 secured by spring mounting means to the stack plate 14. The
spring mounting means includes an annular flange 34 fixed to and
surrounding the female receptacle 32. Mounted to and depending from
the flange 34 are a plurality of bolts 36 (only two bolts 36 being
visible in FIG. 2). The bolts 36 each engage holes 40 within the
lower flange of a mounting ring 42 which in turn is secured such as
by bolts 44 or other suitable means to the stack plate 14. It
should be noted that the holes 40 are larger than the diameter of
the bolts 36 in order that the bolts pass freely through the holes.
Mounted between the flange 34 and the mounting ring 42 are springs
46, each spring being retained by a bolt 36. Thus, the spring
mounting means as just described attaches the lower, first female
receptacle 32 to the stack plate 14 so that the female receptacle
32 has limited flexibility relative to the stack plate 14.
An upper, second female receptacle 48 is secured such as by a
plurality of bolts 50 to the riser plate 12 of the upper detachable
portion 16 (FIG. 1) of the wellhead 10. The female receptacle 48 is
provided with a flange 52 to which the bolts 50 are attached.
Continuing with respect to FIG. 2, a male stinger member 54 is
engageable in both the first female receptacle 32 and the second
female receptacle 48 when inserted into the receptacles. The male
stinger member 54 is provided with an outwardly projecting flange
56 which has a plurality of extensions 56a (only one being shown in
FIG. 2) each of which accommodates a locking means 58.
Each locking means 58 comprises a cylinder 60 suitably secured such
as by welding or bolting to the flange extension 56a. Passing
through an axial aperture in the cylinder is a piston rod 62 having
a piston 64 secured thereto and disposed within the cylinder 60. As
will be appreciated by those skilled in the art, the piston 64 may
be actuated either hydraulically or pneumatically by any suitable
means.
Pivotally secured to the lower end of the piston rod 62 is a link
66 which in turn is pivotally secured to a lever or dog 68. The
lever 68 is journalled such as by means of a pin 70 to a downward
extension 74 of the flange extension 56a. Thus the extension member
74 provides a housing and support for the lever 68 and protects the
rod 62 and link 66. As will be explained hereafter, the lever 68 is
adapted to engage the lower side of the flange 52 which is recessed
as at 52a to accommodate each of the locking means 58.
The piston rod 62 of each locking means 58 is secured to a
stabilizer plate 76, an aperture of which slideably engages a rod
78 secured to the male stinger member 54. Thus, each piston rod 62
may move synchronously with the other piston rods 62 during
actuation.
In order to insure a sealing connection upon engagement of the male
stinger member 54 with the female receptacles 32 and 48, the
engaging surface 80 of the male stinger 54 and the engaging
surfaces 82 of the female receptacles 32 and 48 taper downwardly
and inwardly as shown in the FIG. 2.
Secured by any suitable means such as bolts and the like to the
male stinger 54 or formed integrally thereof is a valve block 84
which receives appropriate fluid supply lines from the umbilical 30
(FIG. 1). The fluid supply lines connect with the valve block 84
and are in fluid communication with a plurality of passageways 86
illustrated in FIG. 2. The fluid passageways 86 (which are
illustrative of preferably a plurality of such passageways) are in
fluid communication with corresponding passageways 88 formed in the
female receptacles 32 and 48. Thus, it may be seen that one end of
each passageway 86 in the male stinger mates for fluid
communication with a passageway 88 when the male stinger 54 is
engaged with the female receptacles 32 and 48.
Annular seal means are provided around each passageway at the
mating surfaces 80 and 82 of the male stinger 54 and female
receptacle members 32 and 48, respectively. Thus, as shown in FIG.
2, an appropriate resilient seal 90 is seated within a flared
portion of each passageway 86 in the male stinger 54. It is to be
understood that other such passageways preferably are provided with
similar seals. It will also be understood that such seals may be
positioned within the female receptacle passageways if so desired.
Consequently, the seals such as those illustrated with the
reference character 90 provide a liquid-tight seal between the
mating end of the passageways in communication between the male
stinger 54 and the female receptacles 32 and 48 to avoid loss of
fluid and to maintain appropriate pressure in the fluid
communication lines or passageways.
An appropriate cover 92 is provided to surround the valve block 84
and various supply lines and the like therewithin. Also, the rod 78
is connected to the male stinger 54 in order to remove the male
stinger, attached or integral valve block 84 and associated parts
from the female receptacle 48 for maintenance purposes and the
like.
With regard to operation of the invention, the male stinger 54 with
attached or integral valve block 84, supply lines, cover 92 and the
like is locked by the lock means 58 in position within the second
female receptacle 48 as shown in FIG. 2. The male stinger 54 is
also engaged within the first female receptacle 32. As has been
described, the first female receptacle 32 is adapted for flexing
attachment to the lower stationary portion 18 of the wellhead 10 by
spring mounting means whch secure the female receptacle 32 to the
stack plate 14. Once the lower stationary portion 18 of the
wellhead 10 is positioned underwater at the well site, the upper
detachable portion 16 of the wellhead 10 may be connected to and
disconnected from the stack portion 18 as becomes necessary. Since
the connector apparatus 20 (and also its duplicate counterpart 22
if provided as shown in FIG. 1) is fixedly secured to the riser by
means of the riser plate 12, removal of the riser or upper
detachable portion 16 of the wellhead removes the second female
receptacle 48 thereby disengaging the male stinger 54 from the
first female receptacle 32. Conversely, connection of the riser
portion 16 to the stack portion 18 of the wellhead 10 causes the
male stinger 54 to engage with the first female receptacle 32,
provided, of course, that the male stinger 54 within the second
female receptacle 48 is positioned approximately over the first
female receptacle 32. During such engaging action, the spring
mounting feature of the first female receptacle 32 permits the
female receptacle to flex or move slightly so as to properly align
its mating surface 82 with the corresponding mating surface 80 of
the male stinger 54. No locking means is necessary to maintain the
male stinger 54 in engagement with the first female receptacle 32
since an appropriate locking means secures the riser portion 16 to
the stack portion 18 of the wellhead.
Upon engagement of the stinger 54 with the first female receptacle
32, the various passageways such as those designated by the
reference character 86 of the stingers 54 and 88 of the female
receptacles are in alignment for fluid communication. Such fluid
communication is maintained once the riser portion 16 is locked to
the stack portion 18 of the wellhead. In this engaged state, the
fluid supply lines communicating with the passageways in the male
stinger are pressurized with fluid which in turn passes through the
fluid supply lines 88 (the only ones shown but which are
representative of a plurality of such lines). The fluid supply
lines 88 emanating from the first female receptacle 32 are
connected to the stack portion 18 of the wellhead for proper
control of the stack and its function. The supply lines 88 of the
second receptacle 48 lead from the valve block 84 through the
second receptacle 48 to the riser portion 16 of the wellhead 10 to
control functions of the riser. It should also be mentioned in
relation to FIG. 1 that the umbilical 30 may be omitted and the
fluid supply lines therethrough pass instead through the umbilical
26 to the riser portion 16 of the wellhead and thence to the valve
block 58. Thus, it may be seen that the male stinger 54, the valve
block 84 and the various fluid transfer and supply lines are
connected to the riser portion 16 of the wellhead and may move up
and down with the riser. When circumstances dictate that the
control lines 26, 28 and 30 shown in FIG. 1 be raised to the
surface of the water, the riser portion 16 of the wellhead is
simply disconnected from the stack portion 18 and drawn to the
surface taking with it the male stinger 54 and associated parts
described above.
However, if it is necessary or desirable to lift only the control
pod 20 to the surface (i.e., leaving the riser plate 12 in place),
then each locking means 58 is actuated. To do so, fluid pressure is
exerted against the piston 64 in an upward direction so that the
rod 62 moves upward. In doing so, the link 66 follows causing the
lever 68 to pivot (in a clockwise manner as shown in FIG. 2) about
the pin 70 so that the lever disengages from the flange portion 52a
of the second female receptacle 48. Thus the male stinger 54 may be
lifted and disengaged from both the first and second female
receptacles 32 and 48 simultaneously. The stinger 54 may be lifted
such as by attaching a cable (not shown) to the upper end of the
rod 78.
For purposes of making re-connections of the apparatus of the
present invention and, assuming that the upper detachable portion
16 of the wellhead 10 is removed, the riser portion 16 is lowered
such as by means of a cable or umbilical 26 back to the wellhead
site. While the riser 16 is guided into engagement with the stack
portion 18 of the wellhead 10, at the same time the male stinger
projecting through the second receptacle 48 is guided into
engagement with the first female receptacle 32. By virtue of the
spring mounting means providing flexing attachment of the first
female receptacle 32 to the stack plate 14, the male stinger 54 is
automatically seated in engagement with the first female receptacle
32. Fluid communication is then established through the passageways
and wellhead functions may be carried out.
On the other hand, if the upper detachable portion 16 of the
wellhead 10 has remained in place at the well site and only the
control pod 20 portion of the apparatus of FIG. 2 removed, the male
stinger 54 is lowered such as by a cable attached to the upper end
of the rod 78 until the male stinger engages the annular second
female receptacle 48. Then the male stinger 54 is guided into a
sealed, seated position by rotating it to align fluid passageways
within the male stinger with corresponding passageways in the
annular second female receptacle 48. Alignment may be facilitated
such as by providing a suitable tongue and groove arrangement as
will be appreciated by those skilled in the art. Once this position
is attained, fluid communication may be established via the
passageways and functions of the wellhead 10 begun after relocking
the locking means 58 by reversing the procedure previously
explained in regard to activating the locking means.
The present invention, therefore, is well adapted to carry out the
objects and attain the ends and advantages mentioned as well as
others inherent therein. While a presently preferred embodiment of
the invention is given for the purpose of disclosure, numerous
changes in the details of construction and arrangement of parts may
be made which will readily suggest themselves to those skilled in
the art and which are encompassed within the spirit of the
invention and the scope of the appended claims.
* * * * *