U.S. patent number 3,703,926 [Application Number 05/094,905] was granted by the patent office on 1972-11-28 for downhole hydraulic pump and engine improvements.
Invention is credited to George K. Roeder.
United States Patent |
3,703,926 |
Roeder |
November 28, 1972 |
DOWNHOLE HYDRAULIC PUMP AND ENGINE IMPROVEMENTS
Abstract
A downhole hydraulically actuated pump having an engine piston
and a pump piston, with the pistons being arranged with
diametrically opposed faces which operate within a common fluid
chamber. Multiple pump pistons can be actuated by the engine piston
so as to enable simultaneous production to occur from a pluraligy
of hydrocarbon producing zones, with the produced fluid flowing to
the surface of the earth along separate flow paths.
Inventors: |
Roeder; George K. (Odessa,
TX) |
Family
ID: |
22247852 |
Appl.
No.: |
05/094,905 |
Filed: |
December 3, 1970 |
Current U.S.
Class: |
166/106; 417/358;
166/369; 417/403 |
Current CPC
Class: |
F04B
9/10 (20130101) |
Current International
Class: |
F04B
9/10 (20060101); F04B 9/00 (20060101); F21b
043/00 () |
Field of
Search: |
;166/106,313,314 ;91/222
;417/358,400,403,404 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Leppink; James A.
Claims
I claim:
1. A hydraulic actuated downhole production pump assembly for
pumping fluid from a fluid producing zone to ground level;
said pump assembly including engine means, pump means, power fluid
inlet means, spent power fluid outlet means, production fluid inlet
means, and production fluid outlet means;
said engine having a control valve means, a working cylinder, an
engine piston reciprocatingly received within said working cylinder
and dividing said cylinder into a lower and upper chamber, a hollow
valve control rod attached to said engine piston and connected to
said valve means for moving said valve means from a first to a
second position in response to the position of said engine
piston;
said pump means having a pump cylinder, a production piston
reciprocatingly received within said pump cylinder and dividing
said pump cylinder into a lower and an upper chamber, a connecting
rod affixed to said engine piston and to said production piston,
pump valve means connecting said production fluid inlet means and
said production fluid outlet means to the lower chamber of said
pump cylinder to enable production fluid to be forced through said
pump means;
means connecting said power fluid inlet means to said hollow valve
control rod, means forming a passageway from said hollow valve
control rod, through said engine piston, and into the lower chamber
of said working cylinder;
said lower chamber of said working cylinder being in communication
with said upper chamber of said pump cylinder;
said control valve means, when in the first position, connects said
power fluid to said upper chamber of said working cylinder;
said control valve means, when in the second position, connects
said upper chamber of said working cylinder to said spent power
fluid outlet means to thereby cause said engine means to
reciprocate said pump piston.
2. The downhole production pump assembly of claim 1, and further
including a second pump cylinder radially spaced apart from the
first recited pump cylinder; a second production piston
reciprocatingly received within said second pump cylinder and
dividing said second pump cylinder into a lower and upper chamber;
a second connecting rod affixed to said engine piston and to said
second production piston;
another pump valve means connected to the last recited lower
chamber for conducting fluid flow from another production fluid
inlet to another production fluid outlet;
the last recited upper chamber being in fluid communication with
the upper chamber of the first recited pump cylinder and with the
lower chamber of said working cylinder.
3. The improvement of claim 2, and further including means by which
the lower chamber of said second pump cylinder is flow connected to
another production zone which is spaced apart from the first
recited fluid producing zone.
4. The improvement of claim 2, and further including means forming
a hollow stinger, said stinger being affixed to and depending from
said pump means the interior of said stinger forming the first
recited production fluid inlet;
a standing valve assembly including a member, means by which said
member is attached to structure associated with a well bore; a
central member telescopingly received within said member, means
forming a central bore through said central member for slidably
receiving said stinger therein;
means forming spaced apart ports in said member, means forming
spaced apart ports in said central member, means by which one of
each port in said member is aligned with one of said ports in said
central member when said central member is in a first position with
respect to said member, and misaligned with respect to each other
when said central member is in a second position with respect to
said member; means forming a flow path which enables fluid to flow
from one fluid producing formation, through a pair of aligned
ports, and into said hollow stinger; means forming a flow path
which enables fluid to flow from another fluid producing formation,
through another pair of aligned ports, and into the first recited
production inlet; whereby, fluid produced from two spaced apart
formations can be produced by the pump and caused to flow along
separate flow paths.
5. The improvement of claim 4, and further including means forming
a flow path from one of said production outlets to the surface of
the ground; means forming another flow path from the second recited
production outlet to the surface of the ground, whereby:
said pump, when properly seated on said central member, produces
fluid from two spaced apart production zones along separate flow
paths, and; when said pump is removed from said central member, the
central member moves with respect to said member to thereby
misalign the pairs of ports in said member and said central member
to thereby preclude intermingling fluid from the spaced apart fluid
producing zones.
6. A pump assembly for pumping a produced fluid from a production
fluid inlet to a production fluid outlet by using a power
fluid;
said pump assembly including means forming an engine, a pump, a
power fluid inlet, a spent power fluid outlet, a production fluid
inlet, and a produced fluid outlet;
said engine having a valve means, a working cylinder, an engine
piston, a hollow valve control rod extending from said piston and
to said valve means for controlling the action of said valve
means;
said pump including a pump cylinder which is located within a
depending marginal portion of said working cylinder, a pump piston
reciprocatingly received within said pump cylinder; means
interconnecting said engine piston to said pump piston;
check valve mean by which one end of said pump cylinder is
connected to said production fluid inlet and to said production
fluid outlet to cause production fluid to be pumped when said pump
piston is reciprocated by said engine;
said pump cylinder and said working cylinder having adjacent end
portions in fluid communication with each other;
means forming a flow path for conducting power fluid from said
power fluid inlet, through said hollow valve control rod, through
said engine piston, and into fluid communication with the adjacent
end portions of the working cylinder and pump cylinder;
said valve means connecting the power fluid inlet to a cylinder
chamber formed by the portion of the working cylinder above said
engine piston when said hollow control rod is moved into one
position by the engine piston; and, said valve means connecting the
spent power fluid outlet to said cylinder chamber of the working
cylinder above said engine piston when said hollow control rod is
moved into another position by the engine piston.
7. The pump assembly of claim 6, and further including a second
pump cylinder radially spaced apart from the first recited pump
cylinder; a second production piston reciprocatingly received
within said second pump cylinder and dividing said second pump
cylinder into a lower and upper chamber; a second connecting rod
affixed to said engine piston and to said second production
piston;
pump valve means connected to the last recited lower chamber for
conducting fluid flow from a production fluid inlet to a production
fluid outlet;
the last recited upper chamber being in fluid communication with
the upper chamber of the first recited pump cylinder and with the
lower chamber of said working cylinder.
8. The improvement of claim 7, and further including means by which
the lower chamber of said second pump cylinder is flow connected to
a production zone which is spaced apart from the first recited
fluid producing zone.
9. The improvement of claim 7 and further including means forming a
hollow stinger, stinger being affixed to and depending from said
pump assembly, the interior of said stinger forming the recited
production fluid inlet;
a standing valve assembly including a member, means by which said
member is attached to structure of a well bore; a central member
telescopingly received within said member, means forming a central
bore through said central member for slidably receiving said
stinger therein;
means forming spaced apart ports in said member, means forming
spaced apart ports in said central member, one of each ports in
said member being aligned with one of said ports in said central
member when said central member is in a first position with respect
to said member, and misaligned with respect to each other when in a
second position; means forming a flow path which enables fluid to
flow from one fluid producing formation, through a pair of aligned
ports, and into said hollow stinger; means forming a flow path
which enables fluid to flow from another fluid producing formation,
through another pair of aligned ports, and into the first recited
production inlet, whereby fluid produced from two spaced apart
formations can be produced along separate flow paths.
10. The improvement of claim 9, and further including means forming
a flow path from one of said production outlets to the surface of
the ground; means forming another flow path from the second recited
production outlet to the surface of the ground, whereby:
said pump, when properly seated on said central member, produces
fluid from two spaced apart production zones along separate flow
paths, and; when said pump is removed from said central member, the
central member moves with respect to said member to thereby
misalign the pairs of ports in said member and said central member
to preclude intermingling fluid from the spaced apart fluid
producing zones.
Description
BACKGROUND OF THE INVENTION
Downhole production pumps which are actuated by hydraulic fluid
pressure applied from the surface of the earth are known to those
skilled in the art. Pumps of this design are usually complex and
require many coacting working parts. Prior art examples of these
pumps are to be found in my previously issued U.S. Pat. No.
3,517,741 and U.S. Pat. No. 3,453,963, to which reference is made
for further background of this invention. There is often a need for
a simplified pump design which is rugged in construction and simple
in operation. Also it would be desirable to use a downhole fluid
actuated pump in a manner to enable production from several
different zones to be produced along separate flow paths.
SUMMARY OF THE INVENTION
This invention sets forth a hydraulic actuated downhole production
pump assembly for pumping fluid from one or more fluid producing
zones to the ground level by the provision of a pump assembly
having an engine means and a pump means, with the engine means
being reciprocated by power fluid which flows from a valve means.
The valve means is connected to a power fluid source which
originates above ground level. The pump has a cylinder disposed
within a housing which also encloses the engine cylinder. A portion
of the housing forms a common chamber which is always exposed to
the power fluid by means of a hollow passageway which leads through
the engine piston, a hollow valve control rod, and to the power
fluid source. Hence, diametrically opposed faces of the pump piston
and engine piston are exposed to the power fluid of the common
chamber.
Multiple pump cylinders may be radially spaced apart within the
engine and pump housing, with each pump cylinder having the lower
extremity thereof connected to a different production zone, and
with each pump outlet being connected to a different flow conduit
for enabling flow of fluid along specific and separate flow paths
to the surface of the earth.
A standing valve assembly together with a packer means precludes
fluid from each of the production zones from intermingling with one
another.
It is therefore a primary object of the present invention to
provide a downhole fluid actuated pump of the free or standing type
which has a minimum number of working parts therein.
Another object of the present invention is the provision of a
downhole pump assembly which has a pump cylinder disposed in fluid
communication with an engine cylinder.
A further object of the present invention is the provision of a
downhole pump assembly having a single engine connected to a
plurality of production pumps, with each pump being connected to
produce fluid from a different fluid producing formation.
A still further object of the present invention is the provision of
a downhole pump and standing valve assembly which enables
simultaneous production of fluid to be realized from a dual
completed well.
Another object of the present invention is the provision of a new
method of producing wells having multiple production zones.
The above and other objects are attained in accordance with the
present invention by the provision of a downhole fluid actuated
pump assembly having an engine with a piston thereof being directly
connected to a production pump piston and with adjacent piston
faces of the pump being in communication with one another, with a
face of the engine piston, and with the power fluid source, while
the remaining face of the engine piston is alternately exposed to
the power fluid source so as to enable the power fluid to
reciprocate the piston of the production pump.
These and other objects and advantages of this invention will
become readily apparent to those skilled in the art upon reading
the following detailed description and by referring to the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational, part diagrammatical, view of a
downhole production pump made in accordance with the present
invention;
FIG. 2 is an enlarged, longitudinal, cross-sectional, part
diagrammatical view of part of the apparatus seen in FIG. 1;
FIG. 3 is a part diagrammatical, longitudinal, part cross-sectional
view of a pump which could be fabricated as seen in FIG. 2;
FIGS. 4 and 5, respectively, are cross-sectional views taken along
line 4--4, and 5--5, respectively, of FIG. 2;
FIG. 6 is a fragmentary, part diagrammatical, longitudinal part
cross-sectional view of a downhole pump made in accordance with the
present invention with the pump being illustrated as operatively
disposed within a borehole;
FIG. 7 is a fragmentary, part cross-sectional, longitudinal view of
the pump seen in FIG. 6;
FIG. 8 is a cross-sectional view taken along line 8-8 of FIG.
7;
FIG. 9 is an enlarged part cross-sectional view of part of the
apparatus disclosed in FIG. 6;
FIG. 10 is a modification of the pump of FIG. 8; and
FIG. 11 is a schematical representation of the flow path used in
conjunction with the downhole pump of FIG. 10.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Throughout the specification, wherever possible, like or similar
numerals will refer to like or similar parts.
In FIG. 1, numeral 8 indicates a casing which is disposed within
and forms a part of a borehole. Packer 9 prevents fluid flow
thereacross and helps maintain a downhole hydraulically actuated
pump assembly 10 properly positioned within the borehole. Power
fluid enters the valve section of the pump at 12 while production
fluid enters the production pump section at 14. The produced fluid
exists at ports 15 where it intermingles with the spent power fluid
which exits from ports 16, with the mixed fluids flowing to the
surface of the earth and to the tank battery or the like.
The valve section 17 is operatively connected to an engine and pump
section which are each preferably disposed within a common housing
18.
Looking now to the details of FIGS. 2-5, the upper interior portion
of the pump assembly is seen to be provided with a power fluid
inlet 20 which exits into a counterbore at 21. A hollow valve
control rod 22 is axially disposed within the counterbore and of
the engine working cylinder 23. Piston chamber 24 reciprocatingly
receives engine piston 25 therein with the engine piston having
diametrically opposed bosses 26, 27 for controlling the operation
of the valve section and for actuating the production pump piston.
Power fluid passageway 28 is seen to be formed within the lower
boss with the central longitudinal passageway 29 extending up
through the piston and into communication with the before mentioned
hollow valve control rod.
Production piston 30 has a lower face 31 and is sealingly and
reciprocatingly received within a production cylinder 32 in the
usual manner so as to force fluid into and out of fluid chamber
32'. The production barrel has an upstanding wall surface 33
attached to a lower adapter 34 so as to form a common chamber which
includes annulus 35. The annulus is in communication with
passageways 28, 29, and the interior of the hollow control rod. The
force of the power fluid is always effected at 35 by means of the
depending end 36 of the hollow control rod. The rod includes a
passageway 37 formed in the terminal end thereof which is in flow
communication with the hollow control rod and with the ports
28.
Annulus 39 is cyclicly closed by the action of a valve element 43
as the annular groove 40 of the control rod is reciprocated to an
upper position by the engine piston. The inlet check valve 41 is
suitably connected from the production pump inlet 14 into chamber
32' while outlet check valve 42 is connected to the production
fluid outlet port from the chamber 32'. The check valves are well
known in the art and can take on several different forms.
Valve element 43 reciprocates within its illustrated bore and has a
circumferentially extending groove formed thereabout which
cooperates with the inside peripheral surface of the bore to form
an annulus 44. The annulus flow connects the exhaust port with port
39 on the upward stroke of the piston. On the downstroke of the
power piston the element uncovers port 39 so as to permit power
fluid to flow at 45.
Engine piston face 47 is alternately exposed to power fluid which
flows from port 39 and to the exhaust port 16. Piston face 48 is
diametrically opposed to the pump piston face 49, and each of the
piston faces are always in communication with power fluid which is
effected at the end of the control rod.
FIGS. 6-11 disclose the method by which a plurality of production
pumps may be connected to a single engine piston, and fluid
produced from a plurality of hydrocarbon producing zones, while the
produced fluid from each of the zones flows to the surface of the
earth along separate flow paths.
As particularly seen in FIG. 6, a fishing neck 51 along with a
conventional hydraulic pump packer means is disposed above seal
means 52. A foot 9' is provided with a passageway 53 which
communicates with annulus 54. The annulus receives fluid from a
production zone through perforations 55. A standing valve assembly
56 has ports 57 formed therein which may be moved into alignment
with passageway 53. Stinger 58 is telescopingly received within the
standing valve assembly and receives fluid from inlet 59 by means
of a suction port 60 which is formed in the terminal end of the
stinger. Hence fluid can flow from a lower zone, through
perforations 61, and into the stinger.
Production fluid from the lower zone exhausts at port 62, flows
into annulus 63, through ports 64 which are formed in the seat, and
up through production pipe 65 which is located within the casing
annulus. Annulus 66 is flow communicated with port 66' and with
production tubing 67.
Looking to the details of the pump and stinger assembly of FIG. 7,
it is seen that the engine piston is provided with radially spaced
apart passageways 128 which are flow connected to the hollow valve
control rod. The lower piston face 148 is connected to a plurality
of connecting rods 149, each of which is disposed within a pump
barrel or cylinder 133', so as to be jointly reciprocated by the
piston. Inlet 60 is isolated from inlet 69 by means of the O-ring
seal placed at groove 68. Inlet 69 is isolated from outlet 62 by
means of packer 70. Outlets 15' and 62 are isolated from one
another by means of packer 19'.
As disclosed in FIG. 9, the standing valve assembly has a conical
shaped axially aligned passageway 81 which sealingly receives seal
means 70 of the pump. Central member 71 of the standing valve
assembly is telescopingly received within member 72 so as to
communicate or to isolate the various passageways with or from one
another. The standing valve assembly engages a seat at 73 while a
packer 74 isolates annulus 75 from inlet ports 53. The telescoping
member has a lowermost portion 76 which is biased in an upward
direction by means of the illustrated spring. Ports 77 are aligned
with ports 78 while annulus 79 is aligned with ports 80. Annulus 81
is isolated from annulus 83 by means of seal 70, with annulus 83
being in communication with passageway 84 and 64. Passageway 84
communicates with chamber 85.
As seen in FIG. 10, the engine pump can be connected to a
multiplicity of different production pumps, as for example, three.
Each of the production pumps may be connected to a different
production zone by extending the teachings of FIGS. 1 and 9. As
seen in FIG. 10, a pump cylinder 233 has a pump rod 249 disposed
therein with power fluid flowing through piston 248 by means of
passageways 228.
As seen in the diagrammatical representation of FIG. 11, flow to
and from each of the pump pistons may be attained by providing
spaced apart packers 86 and 87 for isolating production zone A from
production zones B and C. This enables production fluid from zone A
to enter the terminal end of the stinger, production fluid from
zone B to flow down the casing annulus and into a port located in
the foot; and for production C to flow from above packer 87 and
into another isolated portion of the foot.
Spaced apart production ports 90 are isolated from one another by
the illustrated spaced apart packers 89. Flow from the production
ports flow upwardly at A', B', with the production C' also
including the spent power fluid.
OPERATION
In operation the downhole pump assembly 10 may be of either the
fixed or the free type, such an expedient being known to those
skilled in the art. With the pump properly positioned within the
borehole in the illustrated manner of FIGS. 1-5, production fluid
from a fluid producing zone enters at the pump suction or inlet 14
as the piston 30 is reciprocated by the engine. Check valve 41
enables fluid to flow through passageway 50 and into the chamber 32
on each upstroke of the piston, while check valve 42 permits flow
of fluid from chamber 32' and through production port 15 on each
downstroke of the pump piston.
As the engine reciprocates the piston 30, the diametrically opposed
piston faces 48, 49 are continuously exposed to power fluid which
flows from 38, 37, 29, 28, and into chamber 35. Hence, piston face
47 must have an area which is of a proper ratio with respect to the
piston face 49 so as to provide sufficient force to cause the fluid
within chamber 32' to flow to the surface of the ground.
In order to downstroke piston 25, fluid enters at 38, 39, 45, and
flows into the upper cylinder chamber by means of port 20, thereby
forcing the piston in a downward direction. As the piston reaches
its lower extremity of travel, valve element 43 is shifted by the
action of groove 40 into its uppermost position, whereupon port 39
is now connected to the spent power fluid outlets by means of
annulus 44. This action permits power fluid to flow at 29 into
chamber 35 thereby forcing the piston 25 in an upward direction due
to the difference in the exposed surface area between pistons 48
and 49.
In order to simultaneously produce fluid from two different
production zones, radially spaced apart passageways 128 are
provided in the engine piston 25, and a pump piston and cylinder
assembly arranged with the pump end being paced in communication
with each of the individual producing zones by the employment of
the illustrated seat and valve assembly, the details of which are
more particularly set forth in my above referred to U.S. Pat. No.
3,517,741. Where fluid is being produced from a plurality of fluid
producing zones, fluid from the lower zone flows at 59 up through
the illustrated annulus into ports 77 and 78 where the fluid then
enters the hollow stinger and flows into chamber 132 where the pump
piston forces the fluid through the production port 62, into
annulus 83, passageway 64, up through the production tubing 65, and
then to the surface of the earth.
At the same time, fluid from a fluid producing zone and within
casing annulus 8' is flow communicated with port 53, annulus 79,
port 80, annulus 81, port 69, with the last port being in fluid
communication with another of the production chambers which enables
the fluid to be forced through outlet 15' where the fluid then
flows into the annulus about the pump, into port 66', and up the
production tubing 67 along with the spent power fluid.
When the free pump 118 is desired to be retrieved, power fluid is
pumped down production tubing 65 thereby forcing the pump from its
seat, whereupon the pump travels to the surface of the earth. At
the same time member 71 is forced in an upward direction with
respect to member 72, thereby misaligning ports 78 and 80 with
their respective ports in order to isolate each of the production
zones from one another.
After the pump has been serviced, it can be pumped back downhole
where it will again assume the illustrated position of FIG 9.
* * * * *