WO2010118535A4 - Artificial lift and transfer pump - Google Patents
Artificial lift and transfer pump Download PDFInfo
- Publication number
- WO2010118535A4 WO2010118535A4 PCT/CA2010/001105 CA2010001105W WO2010118535A4 WO 2010118535 A4 WO2010118535 A4 WO 2010118535A4 CA 2010001105 W CA2010001105 W CA 2010001105W WO 2010118535 A4 WO2010118535 A4 WO 2010118535A4
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- chamber
- pump
- fluid
- reversing
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract 123
- 230000006835 compression Effects 0.000 claims abstract 33
- 238000007906 compression Methods 0.000 claims abstract 33
- 238000000034 method Methods 0.000 claims abstract 17
- 238000004891 communication Methods 0.000 claims 40
- 230000015572 biosynthetic process Effects 0.000 claims 4
- 238000005086 pumping Methods 0.000 claims 4
- 238000007789 sealing Methods 0.000 claims 4
- 238000013022 venting Methods 0.000 claims 4
- 238000002955 isolation Methods 0.000 claims 2
- 230000035939 shock Effects 0.000 claims 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
- F04B47/08—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth the motors being actuated by fluid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
A downhole pump for use in oil and gas wells and a method for using same is provided. The pump includes a cylindrical housing having a pair of opposing pistons disposed therein, connected together by a connecting rod that reciprocates within the housing. Each piston separates an outer compression chamber from an inner chamber within the housing, the compression chambers configured to draw in and expel target fluids through separate inlet and outlet check valves. Power fluid, such as pressurized gas or fluid, is used to reciprocate the piston assembly within the housing thereby causing target fluids to be pumped through the compression chambers. A reversing sleeve is disposed about the connecting rod between the pistons, thereby separating the inner chambers, to control the flow of power fluid to the piston assembly through ports disposed in the housing sidewall thereby enabling movement of the piston assembly in the housing.
Claims
1. A pump for pumping a target fluid using at least one power fluid supply, the power fluid having a higher pressure than the target fluid, the pump comprising:
a) a housing having a first end and a second end;
b) a first compression chamber provided in the housing proximate the first end of the housing, the first compression chamber having a first piston and operative to draw in a charge of target fluid during an intake stroke of the first piston and discharge the target fluid during a discharge stroke of the first piston;
c) a second compression chamber provided in the housing proximate the second end of the body, the second compression chamber having a second piston and operative to draw in target fluid during an intake stroke of the second piston and discharge the target fluid during a discharge stroke of the second piston, the second piston connected to the first piston such that a discharge stroke of the first piston causes an intake stroke of the second piston and a discharge stroke of the second piston causes an intake stroke of the first piston;
d) a first chamber adjacent the first compression chamber and separated from the first chamber by the first piston, the first chamber in fluid communication with the at least one power fluid supply during a discharge stroke of the first piston and in fluid communication with a first exhaust port during an intake stroke of the first piston; and e) a second chamber adjacent the second compression chamber and, separated from the second chamber by the second piston, the second
{E5855845.DOC;!} 68 chamber in fluid communication with the at least one power fluid supply during a discharge stroke of the second piston and in fluid communication with a second exhaust port during an intake stroke of the second piston.
2. The pump of claim 1 further comprising a reversing sleeve provided between the first piston and the second piston, the reversing sleeve having a first end partially defining the first chamber and a second end partially defining the second chamber, wherein the reversing sleeve is operative to expose the first chamber to the first exhaust port during a discharge stroke of the first piston and to block the first exhaust port during an intake stroke of the first piston, and wherein the reversing sleeve is operative to expose the second chamber to the second exhaust port during a discharge stroke of the second piston and block the second exhaust port during a discharge stroke of the second piston.
3. The pump of claim 2 wherein the reversing sleeve has a first reversing sleeve exhaust port, in fluid communication with the first chamber, that substantially aligns with the first exhaust port during a discharge stroke of the first piston and a second reversing sleeve exhaust port, in fluid communication with the second chamber, that substantially aligns with the second exhaust port during a discharge stroke of the second piston.
4. The pump of claim 2 or claim 3 further comprising a first inlet port in fluid communication with the at one least power fluid supply and a second inlet port in fluid communication with the at least one power fluid supply, wherein the first chamber is in fluid communication with the first inlet port during a discharge stroke of the first piston and the second chamber is in fluid communication with the second inlet port during a discharge stroke of the
{E5855845.DOC;! }
69 second piston, and where the reversing sleeve blocks the first chamber from the first inlet port during an intake stroke of the first piston and the reversing sleeve blocks the second chamber from the second inlet port during a discharge stroke of the second piston.
5. The pump of any one of claims 2 to 4 further comprising:
a) a first boss extending from a head of the first piston into the first chamber, the first boss and the first end of the reversing sleeve sized so that an outer surface of the first boss mates with an inner surface of the first end of the reversing sleeve to define a first boss annulus when the first piston is proximate to a bottom of an intake stroke; b) a second boss extending from a head of the second piston into the second chamber, the second boss and the second end of the reversing sleeve sized so that an outer surface of the second boss mates with an inner surface of the second end of the reversing sleeve to define a second boss annulus when the second piston is proximate to a bottom of an intake stroke;
c) a first engine-reversing device operative to increase the pressure in the first boss annulus when the first piston is proximate a bottom of an intake stroke; and
d) a second engine-reversing device operative to increase the pressure in the second boss annulus when the second piston is proximate a bottom of an intake stroke.
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70
6. The pump of claim 5 wherein the first reversing device comprises a booster having:
a) a first booster piston and a second booster piston, the first booster piston provided in a booster chamber, the booster chamber in fluid communication with the first boss annulus when the first piston is at a bottom of an intake stroke; and
b) a second booster piston connected to the first booster piston, the second booster piston in fluid communication with the second chamber when the first piston is at the bottom of the intake stroke, wherein the a surface area of the second booster piston is greater than a surface area of the first booster piston.
7. The pump of claim 6 further comprising a biasing device acting on the booster to bias the booster away from the first piston.
8. The pump of any one of claims 2 to 7 further comprising a bumper shock auxiliary device provided between the first piston and the reversing sleeve to bias the first piston away from the reversing sleeve.
9. The pump of claim 6 or claim 7 wherein the first reversing device further comprises:
a) a high-pressure chamber in fluid communication with the second chamber when the first piston is at the bottom end of the intake stroke, the high-pressure chamber acting on the reversing sleeve away from the first piston; and
b) a low-pressure chamber vented to the first chamber when the first piston is at the bottom end of the intake stroke, the low pressure chamber partially defined by the reversing sleeve.
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71
10. The pump of claim 5 further comprising:
a) a pressure equalization spool operative to route high-pressure power fluid from the second chamber to the first boss annulus when the first piston is at the bottom end of the intake stroke;
b) a high-pressure chamber in fluid communication with the second chamber when the first piston is at the bottom end of the intake stroke, the high-pressure chamber acting on the reversing sleeve away from the first piston;
c) a low-pressure chamber vented to the first chamber when the first piston is at the bottom end of the intake stroke, the low pressure chamber partially defined by the reversing sleeve; and
d) a biasing device acting on the pressure equalization spool to bias the pressure equalization spool away from the first piston.
11. The pump of claim 5 further comprising an equalization spool having:
a) a plunger provided in a plunger chamber, the plunger chamber in fluid communication with the first boss annulus when the first piston is at an end of an intake stroke;
b) a central passage positioned behind the plunger and in fluid communication with the second chamber when the first piston is at the end of an intake stroke;
c) a high-pressure chamber in fluid communication with the second chamber when the first piston is at the end of the intake stroke, the high-pressure chamber acting on the reversing sleeve away from the first piston;
{E5855845.DOC;! }
72 d) a low-pressure chamber vented to the first chamber when the first piston is at the end of the intake stroke, the low pressure chamber partially defined by the reversing sleeve; and
e) a biasing device biasing the pressure equalization spool away from the first piston.
12. The pump of any one of claims 2 to 11 further comprising:
a) a reversing spool provided within the reversing sleeve and having a first end and a second end, the reversing sleeve and the reversing spool partially defining the first chamber and the second chamber;
b) wherein when the first piston is proximate an end of a discharge stroke, the second piston contacts the second end of the reversing spool, forcing the reversing spool towards the first piston, contacting the reversing sleeve and moving the reversing sleeve towards the first piston causing the reversing sleeve to place the second chamber in fluid communication with the at least one power fluid supply and venting the first chamber; and
c) wherein when the second piston is proximate an end of a discharge stroke, the first piston contacts the first end of the reversing spool, forcing the reversing spool towards the second piston and causing the reversing sleeve to place the second chamber in fluid communication with the at least one power fluid supply and venting the second chamber.
13. The pump of claim 12 where the reversing spool includes a position piston to hold the reversing spool in position and a balancing pressure piston to counteract pressure forces on the reversing spool.
<E5855β45.DOC;l}
73
14. The pump of claim 2 wherein the first compression chamber, the first piston, the first chamber, a connecting rod connected between the first piston and the second piston, the second chamber, the second piston and the second compression chamber are all aligned along a single axis.
15. The pump of claim 2 wherein a first intake valve is provided between the first compression chamber and a target fluid intake conduit and a first discharge valve is provided between the first compression chamber and a discharge conduit, and wherein a second intake valve is provided between the second compression chamber and the target fluid intake conduit and a second discharge valve is provided between the second compression chamber and the discharge conduit.
16. The pump of claim 15 further comprising an outer housing enclosing the housing wherein the target fluid intake conduit and the discharge conduit are provided between the outer housing and the housing.
17. The pump of claim 16 wherein the housing and the outer housing are cylindrical.
18. The pump of claim 16 wherein the target fluid conduit has an opening at a second end of the pump.
19. The pump of claim 15 wherein the first exhaust port and the second exhaust port are in fluid communication with the discharge conduit.
20. The pump of any one of claims 2 to 19 wherein the first chamber and second chamber are in fluid isolation from each other.
21. The pump of any one of claims 2 to 20 wherein the pump is configured for seal-less operation.
{E5855845.DOC;!}
22. The pump of any one of claims 2 to 21 further comprising a first sealing ring encircling first piston and separating the first compression chamber from the first chamber and a second sealing ring encircling the second piston and separating the second compression chamber from the second chamber.
23. A method of pumping a target fluid, the method comprising:
a) providing a pump having a first piston separating a first compression chamber from a first chamber, a second piston separating a second compression chamber from a second chamber, the first piston and the second piston connected with a connecting rod so that the first piston and the second piston move in unison, the first chamber and the second chamber positioned between the first piston and the second piston; b) supplying power fluid having a higher pressure than the target fluid to the first chamber to drive the first piston through a discharge stroke and the second piston through an intake stroke;
c) when the first piston reaches an end of the discharge stroke, supplying power fluid to the second chamber to drive the second piston through a subsequent discharge stroke; and
d) when the second piston has reached the end of the subsequent discharge stroke, supplying power fluid to the first chamber.
24. The method of claim 23 wherein the target fluid is formation fluid and the pump is placed down a well casing to come into contact with the target fluid.
25. The method of claim 23 or claim 24 wherein the pump is inserted in a well casing with a first tubing string supplying power fluid to the pump and the pumped target fluid passing up a first annulus between the well casing and the first tubing.
{E5855845.DOC;!}
75
26. The method of claim 25 wherein used power fluid is exhausted from the pump into the first annulus.
27. The method of claim 25 or claim 26 wherein a second tubing string is provided inside the first tubing string and power fluid is supplied to the pump through the second tubing string, exhausted target fluid is exhausted to the first annulus and used power fluid is exhausted to a second annulus formed between the first tubing string and the second tubing string.
28. A method of inserting the pump of claim 1 down a well casing to pump formation fluid up the well casing, the method comprising:
a) inserting a first tubing string and a second tubing string down the well casing, the second tubing string connected to a far end of the first tubing string;
b) placing the pump in the first tubing string;
c) supplying power fluid into the first tubing string behind the pump to drive the pump down the first tubing string to the far end of the first tubing string;
d) continuing to supply power fluid down the first tubing string to drive the pump and passing pumped target fluid up the second tubing string; and
e) forcing fluid down the second tubing string to force the pump up the first tubing string.
29. A pump for pumping a target fluid using at least one power fluid supply, the power fluid having a higher pressure than the target fluid, the pump comprising:
a) a housing having a first end and a second end;
{E5855845.DOC;! }
76 b) a first compression chamber provided in the housing proximate the first end of the housing, the first compression chamber having a first piston and operative to draw in a charge of target fluid during an intake stroke of the first piston and discharge the target fluid during a discharge stroke of the first piston;
c) a second compression chamber provided in the housing proximate the second end of the body, the second compression chamber having a second piston and operative to draw in target fluid during an intake stroke of the second piston and discharge the target fluid during a discharge stroke of the second piston, the second piston connected to the first piston such that a discharge stroke of the first piston causes an intake stroke of the second piston and a discharge stroke of the second piston causes an intake stroke of the first piston;
d) a first chamber adjacent the first compression chamber and separated from the first chamber by the first piston, the first chamber in fluid communication with the at least one power fluid supply during a discharge stroke of the first piston and in fluid communication with a first exhaust port during an intake stroke of the first piston;
e) a second chamber adjacent the second compression chamber and, separated from the second chamber by the second piston, the second chamber in fluid communication with the at least one power fluid supply during a discharge stroke of the second piston and in fluid communication with a second exhaust port during an intake stroke of the second piston;
{E5855845.DOC;! }
77 f) the pump further comprising a reversing sleeve provided between the first piston and the second piston, the reversing sleeve having a first
_ end partially defining the first chamber and a second end partially defining the second chamber, wherein the reversing sleeve is operative to expose the first chamber to the first exhaust port during a discharge stroke of the first piston and to block the first exhaust port during an intake stroke of the first piston, and wherein the reversing sleeve is operative to expose the second chamber to the second exhaust port during a discharge stroke of the second piston and block the second exhaust port during a discharge stroke of the second piston; and g) the pump further comprising:
i) a first boss extending from a head of the first piston into the first chamber, the first boss and the first end of the reversing sleeve sized so that an outer surface of the first boss mates with an inner surface of the first end of the reversing sleeve to define a first boss annulus when the first piston is proximate to a bottom of an intake stroke,
ύ) a second boss extending from a head of the second piston into the second chamber, the second boss and the second end of the reversing sleeve sized so that an outer surface of the second boss mates with an inner surface of the second end of the reversing sleeve to define a second boss annulus when the second piston is proximate to a bottom of an intake stroke,
(E5855845.DOC;! )
78 iϋ) a first engine-reversing device operative to increase the pressure in the first boss annulus when the first piston is proximate a bottom of an intake stroke, and iv) a second engine-reversing device operative to increase the pressure in the second boss annulus when the second piston is proximate a bottom of an intake stroke.
30. The pump of claim 29 wherein the reversing sleeve has a first reversing sleeve exhaust port, in fluid communication with the first chamber, that substantially aligns with the first exhaust port during a discharge stroke of the first piston and a second reversing sleeve exhaust port, in fluid communication with the second chamber, that substantially aligns with the second exhaust port during a discharge stroke of the second piston.
31. The pump of claim 29 or claim 30 further comprising a first inlet port in fluid communication with the at one least power fluid supply and a second inlet port in fluid communication with the at least one power fluid supply, wherein the first chamber is in fluid communication with the first inlet port during a discharge stroke of the first piston and the second chamber is in fluid communication with the second inlet port during a discharge stroke of the second piston, and where the reversing sleeve blocks the first chamber from the first inlet port during an intake stroke of the first piston and the reversing sleeve blocks the second chamber from the second inlet port during a discharge stroke of the second piston.
{E585584S.DOC;! }
79
32. The pump of any one of claims 29 to 31 wherein the first reversing device comprises a booster having:
a) a first booster piston and a second booster piston, the first booster piston provided in a booster chamber, the booster chamber in fluid communication with the first boss annulus when the first piston is at a bottom of an intake stroke; and
b) a second booster piston connected to the first booster piston, the second booster piston in fluid communication with the second chamber when the first piston is at the bottom of the intake stroke, wherein the a surface area of the second booster piston is greater than a surface area of the first booster piston.
33. The pump of claim 32 further comprising a biasing device acting on the booster to bias the booster away from the first piston.
34. The pump of any one of claims 29 to 33 further comprising a bumper shock auxiliary device provided between the first piston and the reversing sleeve to bias the first piston away from the reversing sleeve.
35. The pump of claim 32 or claim 33 wherein the first reversing device further comprises:
a) a high-pressure chamber in fluid communication with the second chamber when the first piston is at the bottom end of the intake stroke, the high-pressure chamber acting on the reversing sleeve away from the first piston; and
b) a low-pressure chamber vented to the first chamber when the first piston is at the bottom end of the intake stroke, the low pressure chamber partially defined by the reversing sleeve.
(E5855845.DOC;! }
80
36. The pump of any one of claims 29 to 35 further comprising:
a) a pressure equalization spool operative to route high-pressure power fluid from the second chamber to the first boss annulus when the first piston is at the bottom end of the intake stroke;
b) a high-pressure chamber in fluid communication with the second chamber when the first piston is at the bottom end of the intake stroke, the high-pressure chamber acting on the reversing sleeve away from the first piston;
c) a low-pressure chamber vented to the first chamber when the first piston is at the bottom end of the intake stroke, the low pressure chamber partially defined by the reversing sleeve; and
d) a biasing device acting on the pressure equalization spool to bias the pressure equalization spool away from the first piston.
37. The pump of any one of claims 29 to 36 further comprising an equalization spool having:
a) a plunger provided in a plunger chamber, the plunger chamber in fluid communication with the first boss annulus when the first piston is at an end of an intake stroke;
b) a central passage positioned behind the plunger and in fluid communication with the second chamber when the first piston is at the end of an intake stroke;
c) a high-pressure chamber in fluid communication with the second chamber when the first piston is at the end of the intake stroke, the high-pressure chamber acting on the reversing sleeve away from the first piston;
{E585584S.DOC;) }
81 d) a low-pressure chamber vented to the first chamber when the first piston is at the end of the intake stroke, the low pressure chamber partially defined by the reversing sleeve; and
e) a biasing device biasing the pressure equalization spool away from the first piston.
38. The pump of any one of claims 29 to 37 further comprising:
a) a reversing spool provided within the reversing sleeve and having a first end and a second end, the reversing sleeve and the reversing spool partially defining the first chamber and the second chamber;
b) wherein when the first piston is proximate an end of a discharge stroke, the second piston contacts the second end of the reversing spool, forcing the reversing spool towards the first piston, contacting the reversing sleeve and moving the reversing sleeve towards the first piston causing the reversing sleeve to place the second chamber in fluid communication with the at least one power fluid supply and venting the first chamber; and
c) wherein when the second piston is proximate an end of a discharge stroke, the first piston contacts the first end of the reversing spool, forcing the reversing spool towards the second piston and causing the reversing sleeve to place the second chamber in fluid communication with the at least one power fluid supply and venting the second chamber.
39. The pump of claim 38 where the reversing spool includes a position piston to hold the reversing spool in position and a balancing pressure piston to counteract pressure forces on the reversing spool.
{ES855845.DOC;!}
82
40. The pump of any one of claims 29 to 39 wherein the first compression chamber, the first piston, the first chamber, a connecting rod connected between the first piston and the second piston, the second chamber, the second piston and the second compression chamber are all aligned along a single axis.
41. The pump of any one of claims 29 to 40 wherein a first intake valve is provided between the first compression chamber and a target fluid intake conduit and a first discharge valve is provided between the first compression chamber and a discharge conduit, and wherein a second intake valve is provided between the second compression chamber and the target fluid intake conduit and a second discharge valve is provided between the second compression chamber and the discharge conduit.
42. The pump of claim 41 further comprising an outer housing enclosing the housing wherein the target fluid intake conduit and the discharge conduit are provided between the outer housing and the housing.
43. The pump of claim 42 wherein the housing and the outer housing are cylindrical.
44. The pump of claim 42 or 43 wherein the target fluid conduit has an opening at a second end of the pump.
45. The pump of any one of claims 41 to 44 wherein the first exhaust port and the second exhaust port are in fluid communication with the discharge conduit.
46. The pump of any one of claims 29 to 45 wherein the first chamber and second chamber are in fluid isolation from each other.
47. The pump of any one of claims 29 to 46 wherein the pump is configured for seal-less operation.
{ES85S845.DOC;! }
83
48. The pump of any one of claims 29 to 47 further comprising a first sealing ring encircling first piston and separating the first compression chamber from the first chamber and a second sealing ring encircling the second piston and separating the second compression chamber from the second chamber.
49. A method of pumping a target fluid, the method comprising:
a) providing the pump of claim 29, the pump further comprising a connecting rod connecting the first piston to the second piston wherein the first piston and the second piston move in unison, the first chamber and the second chamber positioned between the first piston and the second piston;
b) supplying power fluid having a higher pressure than the target fluid to the first chamber to drive the first piston through a discharge stroke and the second piston through an intake stroke;
c) when the first piston reaches an end of the discharge stroke, supplying power fluid to the second chamber to drive the second piston through a subsequent discharge stroke; and
d) when the second piston has reached the end of the subsequent discharge stroke, supplying power fluid to the first chamber.
50. The method of claim 49 wherein the target fluid is formation fluid and the pump is placed down a well casing to come into contact with the target fluid.
51. The method of claim 49 or claim 50 wherein the pump is inserted in a well casing with a first tubing string supplying power fluid to the pump and the pumped target fluid passing up a first annulus between the well casing and the first tubing.
{E5855845.DOC;!}
84
52. The method of claim 51 wherein used power fluid is exhausted from the pump into the first annulus.
53. The method of claim 51 or claim 52 wherein a second tubing string is provided inside the first tubing string and power fluid is supplied to the pump through the second tubing string, exhausted target fluid is exhausted to the first annulus and used power fluid is exhausted to a second annulus formed between the first tubing string and the second tubing string.
54. A method of inserting the pump of claim 29 down a well casing to pump formation fluid up the well casing, the method comprising:
a) inserting a first tubing string and a second tubing string down the well casing, the second tubing string connected to a far end of the first tubing string;
b) placing the pump in the first tubing string;
c) supplying power fluid into the first tubing string behind the pump to drive the pump down the first tubing string to the far end of the first tubing string;
d) continuing to supply power fluid down the first tubing string to drive the pump and passing pumped target fluid up the second tubing string; and
e) forcing fluid down the second tubing string to force the pump up the first tubing string.
{E5855845.DOC;!}
85
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23126609P | 2009-08-04 | 2009-08-04 | |
| US61/231,266 | 2009-08-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2010118535A1 WO2010118535A1 (en) | 2010-10-21 |
| WO2010118535A4 true WO2010118535A4 (en) | 2011-01-27 |
Family
ID=42982096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CA2010/001105 WO2010118535A1 (en) | 2009-08-04 | 2010-07-15 | Artificial lift and transfer pump |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2709048A1 (en) |
| WO (1) | WO2010118535A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3021269A1 (en) * | 2016-04-28 | 2017-11-02 | Hansen Downhole Pump Solutions A.S. | Hydraulically powered downhole piston pump |
| CN111022005B (en) * | 2018-10-10 | 2022-05-17 | 中国石油化工股份有限公司 | Variable flow channel type inflow control device, oil extraction nipple and production pipe string |
| CN115217444B (en) * | 2022-06-29 | 2024-05-10 | 陕西航天泵阀科技集团有限公司 | Underground liquid draining device and system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2948224A (en) * | 1959-11-09 | 1960-08-09 | Beryl A Bailey | Hydraulic pump |
| US3849030A (en) * | 1973-03-22 | 1974-11-19 | Kobe Inc | Fluid operated pump with opposed pistons and valve in middle |
| US4293287A (en) * | 1979-03-21 | 1981-10-06 | Dresser Industries, Inc. | Reversing valve assembly for a fluid operated well pump |
-
2010
- 2010-07-06 CA CA2709048A patent/CA2709048A1/en not_active Abandoned
- 2010-07-15 WO PCT/CA2010/001105 patent/WO2010118535A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CA2709048A1 (en) | 2011-02-04 |
| WO2010118535A1 (en) | 2010-10-21 |
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