CA2835976C - Plunger type oil-sucking pump and plunger thereof - Google Patents
Plunger type oil-sucking pump and plunger thereof Download PDFInfo
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- CA2835976C CA2835976C CA2835976A CA2835976A CA2835976C CA 2835976 C CA2835976 C CA 2835976C CA 2835976 A CA2835976 A CA 2835976A CA 2835976 A CA2835976 A CA 2835976A CA 2835976 C CA2835976 C CA 2835976C
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- plunger
- sealing sleeve
- core
- plunger core
- liquid passing
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- 238000007789 sealing Methods 0.000 claims abstract description 160
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229920003051 synthetic elastomer Polymers 0.000 claims description 4
- 239000005061 synthetic rubber Substances 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 6
- 239000003129 oil well Substances 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A plunger oil-well pump and its plunger are provided. The plunger comprises a plunger core (2) whose outer wall has some liquid passing holes (4). A flexible sealing sleeve (3) is set around the outer wall of the plunger core. The flexible sealing sleeve (3) is such located that it can cover said some liquid passing holes (4) in the plunger core (2). The plunger solves the problem of bad coaxiality, ellipticity and severely biased friction between the sealing means of the hydraulic plunger pump and the pump cylinder. The requirements for machining accuracy and mounting of the plunger are low. The plunger has better sealing performance.
Description
PLUNGER TYPE OIL-SUCKING PUMP AND PLUNGER THEREOF
Field of the Invention The present invention pertains to a technical field of petroleum exploitation, and specifically relates to a plunger for a plunger type oil-sucking pump and the plunger type oil-sucking pump containing the plunger.
Background of the Invention As one of traditional lifting manners in the global petroleum industry and a dominant artificial lifting manner to date, a rod plunger pump generally refers to a plunger type oil-sucking pump driven by reciprocatingly moving a sucker rod up and down and is currently used as a main mechanical oil-pumping equipment in the world.
A typical oil-pumping equipment with a rod available at present is mainly composed of three parts: a driving device on the ground, i.e., a pumping unit, a oil-sucking pump mounted in a lower portion of a tubing string, and a sucker rod. The sucker rod is connected from above to the pumping unit via a polished rod and is connected from below to a plunger of the oil-sucking pump thereby to transmit reciprocating movement and power of the pumping unit on the ground to the underground oil-sucking pump to reciprocatingly move the plunger in the oil-sucking pump up and down so that a pressure of liquid in the tubing string can be boosted and fluid produced from oil layers can be lifted to the ground. The oil-sucking pump is mainly composed of four parts including a pump barrel, the plunger, a fixed valve assembly and a movable valve assembly. The pump barrel is a cylinder jacket in which the plunger with the movable valve assembly is mounted, and a seal is formed between the plunger and the pump barrel so that liquid in the pump barrel can be discharged. The fixed valve assembly includes an intake valve of the pump which remains fixed during pumping. The movable valve assembly includes a discharge valve of the pump which is moveable along with the plunger.
The pumping equipment equipped with the rod plunger pump has been developed into a new stage of hydraulic self-sealing plunger pumps. Chinese patent application No. 200510082603.1 discloses a hydraulic self-sealing plunger oil-sucking pump, a plunger of which is enclosed by an elastic sealing body enclosed by wear resistant diameter variable sealing rings. The sealing rings include a plurality of rigid metal rings and a plurality of elastic rings which enclose the elastic sealing body at intervals. This structure can address pump leakage issue to a certain extent and improve pump volumetric efficiency.
However, in this structure, since there is no fixed mutual connection among the plurality of metal rings of the sealing rings, not only requirements for machining are high but also the problem that the wear resistant diameter variable sealing rings are not radially centered with the plunger to yield poor coaxiality and ellipticity is liable to occur. Particularly when the sealing rings are subjected to a force during oil exploitation, the problem that the sealing rings are not radially centered with the plunger to have poor coaxiality and ellipticity becomes more prominent, and thus the sealing rings, especially the sealing ring closest to a lower pump cavity wears eccentricly and severely so as to have a short life.
Summary of the Invention In view of the above disadvantages existing in the prior art, the technical problem to be solved by the present invention is to provide a plunger for a plunger type oil-sucking pump and the plunger type oil-sucking pump containing the plunger, wherein the plunger has a simple structure and excellent sealing performance and can eliminate eccentric wear between the plunger and a pump barrel.
The technical solution employed to solve the above technical problem resides in that the plunger for a plunger type oil-sucking pump comprises a plunger core, wherein a number of liquid passing holes are opened in an outer wall of the plunger core, a flexible sealing sleeve having elasticity tightly encloses the outer wall of the plunger core, and the flexible sealing sleeve is provided at such a position on the plunger core as to cover said number of the liquid passing holes of the plunger core.
Preferably, said number of the liquid passing holes comprise multiple liquid passing holes, and the multiple liquid passing holes have identical shape and size and are collectively arranged on the same level of the plunger core evenly in a circumferential direction of the plunger core.
Field of the Invention The present invention pertains to a technical field of petroleum exploitation, and specifically relates to a plunger for a plunger type oil-sucking pump and the plunger type oil-sucking pump containing the plunger.
Background of the Invention As one of traditional lifting manners in the global petroleum industry and a dominant artificial lifting manner to date, a rod plunger pump generally refers to a plunger type oil-sucking pump driven by reciprocatingly moving a sucker rod up and down and is currently used as a main mechanical oil-pumping equipment in the world.
A typical oil-pumping equipment with a rod available at present is mainly composed of three parts: a driving device on the ground, i.e., a pumping unit, a oil-sucking pump mounted in a lower portion of a tubing string, and a sucker rod. The sucker rod is connected from above to the pumping unit via a polished rod and is connected from below to a plunger of the oil-sucking pump thereby to transmit reciprocating movement and power of the pumping unit on the ground to the underground oil-sucking pump to reciprocatingly move the plunger in the oil-sucking pump up and down so that a pressure of liquid in the tubing string can be boosted and fluid produced from oil layers can be lifted to the ground. The oil-sucking pump is mainly composed of four parts including a pump barrel, the plunger, a fixed valve assembly and a movable valve assembly. The pump barrel is a cylinder jacket in which the plunger with the movable valve assembly is mounted, and a seal is formed between the plunger and the pump barrel so that liquid in the pump barrel can be discharged. The fixed valve assembly includes an intake valve of the pump which remains fixed during pumping. The movable valve assembly includes a discharge valve of the pump which is moveable along with the plunger.
The pumping equipment equipped with the rod plunger pump has been developed into a new stage of hydraulic self-sealing plunger pumps. Chinese patent application No. 200510082603.1 discloses a hydraulic self-sealing plunger oil-sucking pump, a plunger of which is enclosed by an elastic sealing body enclosed by wear resistant diameter variable sealing rings. The sealing rings include a plurality of rigid metal rings and a plurality of elastic rings which enclose the elastic sealing body at intervals. This structure can address pump leakage issue to a certain extent and improve pump volumetric efficiency.
However, in this structure, since there is no fixed mutual connection among the plurality of metal rings of the sealing rings, not only requirements for machining are high but also the problem that the wear resistant diameter variable sealing rings are not radially centered with the plunger to yield poor coaxiality and ellipticity is liable to occur. Particularly when the sealing rings are subjected to a force during oil exploitation, the problem that the sealing rings are not radially centered with the plunger to have poor coaxiality and ellipticity becomes more prominent, and thus the sealing rings, especially the sealing ring closest to a lower pump cavity wears eccentricly and severely so as to have a short life.
Summary of the Invention In view of the above disadvantages existing in the prior art, the technical problem to be solved by the present invention is to provide a plunger for a plunger type oil-sucking pump and the plunger type oil-sucking pump containing the plunger, wherein the plunger has a simple structure and excellent sealing performance and can eliminate eccentric wear between the plunger and a pump barrel.
The technical solution employed to solve the above technical problem resides in that the plunger for a plunger type oil-sucking pump comprises a plunger core, wherein a number of liquid passing holes are opened in an outer wall of the plunger core, a flexible sealing sleeve having elasticity tightly encloses the outer wall of the plunger core, and the flexible sealing sleeve is provided at such a position on the plunger core as to cover said number of the liquid passing holes of the plunger core.
Preferably, said number of the liquid passing holes comprise multiple liquid passing holes, and the multiple liquid passing holes have identical shape and size and are collectively arranged on the same level of the plunger core evenly in a circumferential direction of the plunger core.
2 Alternatively, said number of the liquid passing holes comprise multiple liquid passing holes, the multiple liquid passing holes are arranged on different levels of the plunger core along an axis of the plunger core, in which a plurality of liquid passing holes having identical shape and size are provided on any level along the axis of the plunger core evenly in the circumferential direction of the plunger core.
The number of the liquid passing holes arranged on the same level of the plunger core is preferably 2-8, and more preferably 4-6.
Preferably, the flexible sealing sleeve includes an elastic body and a number of wear resistant rings which are embedded in the elastic body at intervals in an axial direction of the elastic body, wherein the elastic body is made of an elastic material and the wear resistant rings are made of a wear resistant material. Since the wear resistant rings are connected integrally with the elastic body, the problem that the sealing rings are not radially centered with the plunger to have poor coaxiality and ellipticity can be solved effectively when the whole flexible sealing sleeve encloses the outer wall of the plunger core.
Preferably, the elastic body is made of synthetic rubber and the wear resistant rings are made of nylon or a rigid material such as copper or steel.
Preferably, the wear resistant rings are moulded integrally with the elastic body by a pouring process, and the flexible sealing sleeve is connected integrally with the plunger core. Thus, machining precision and mounting requirements for the flexible sealing sleeve are lowered.
Certainly, the wear resistant rings can be formed integrally with the elastic body by another processing means.
More preferably, the outer wall of the plunger core is tightly enclosed by one primary sealing sleeve which is provided on either end of the flexible sealing sleeve, or the outer wall of the plunger core is tightly enclosed by two primary sealing sleeves which are provided on both ends of the flexible sealing sleeve respectively, and the primary sealing sleeve(s) is connected integrally with the flexible sealing sleeve.
More preferably, the outer wall of the plunger core is tightly enclosed by two primary sealing sleeves including an upper primary sealing sleeve and a
The number of the liquid passing holes arranged on the same level of the plunger core is preferably 2-8, and more preferably 4-6.
Preferably, the flexible sealing sleeve includes an elastic body and a number of wear resistant rings which are embedded in the elastic body at intervals in an axial direction of the elastic body, wherein the elastic body is made of an elastic material and the wear resistant rings are made of a wear resistant material. Since the wear resistant rings are connected integrally with the elastic body, the problem that the sealing rings are not radially centered with the plunger to have poor coaxiality and ellipticity can be solved effectively when the whole flexible sealing sleeve encloses the outer wall of the plunger core.
Preferably, the elastic body is made of synthetic rubber and the wear resistant rings are made of nylon or a rigid material such as copper or steel.
Preferably, the wear resistant rings are moulded integrally with the elastic body by a pouring process, and the flexible sealing sleeve is connected integrally with the plunger core. Thus, machining precision and mounting requirements for the flexible sealing sleeve are lowered.
Certainly, the wear resistant rings can be formed integrally with the elastic body by another processing means.
More preferably, the outer wall of the plunger core is tightly enclosed by one primary sealing sleeve which is provided on either end of the flexible sealing sleeve, or the outer wall of the plunger core is tightly enclosed by two primary sealing sleeves which are provided on both ends of the flexible sealing sleeve respectively, and the primary sealing sleeve(s) is connected integrally with the flexible sealing sleeve.
More preferably, the outer wall of the plunger core is tightly enclosed by two primary sealing sleeves including an upper primary sealing sleeve and a
3 lower primary sealing sleeve, the upper primary sealing sleeve is provided above the flexible sealing sleeve to be in threaded connection with the plunger core and has a lower end connected to an upper end of the flexible sealing sleeve, and the lower primary sealing sleeve is provided below the flexible sealing sleeve to be in threaded connection with the plunger core and has an upper end connected to a lower end of the flexible sealing sleeve. Through the upper primary sealing sleeve and the lower primary sealing sleeve which are connected to the both ends of the flexible sealing sleeve respectively, a position at which the flexible sealing sleeve is provided on the plunger is restricted and the plunger is allowed to obtain adequate centerability.
Furthermore, the upper and lower primary sealing sleeves also serve as primary seals on both ends of the plunger.
Wherein, the upper primary sealing sleeve and the lower primary sealing sleeve are made of a wear resistant material.
The technical solution of the present invention also resides in that a plunger type oil-sucking pump comprises a pump barrel and the foregoing plunger provided in the pump barrel. Wherein, a rigid gap seal which can perform sealing in a manner the same as that of an existing conventional pump without action of hydraulic pressure is formed between each of the primary sealing sleeves provided on the both ends of the flexible sealing sleeve and the pump barrel so that oil well pressure can be borne effectively and primary sealing of the oil-sucking pump is realized. Meanwhile, since the two primary sealing sleeves, the flexible sealing sleeve and the plunger core are formed integrally, sealing performance of the whole pump is superior and the problem that oil leaks from a gap between the pump barrel and the plunger of the existing hydraulic plunger pump is avoided thus to attain stronger adaptability.
The oil-sucking pump of the present invention can improve coaxiality and ellipticity between the flexible sealing sleeve and the plunger core, eliminate eccentric wear between the flexible sealing sleeve and the pump barrel, and lower machining precision and mounting requirements for the flexible sealing sleeve so that sealing performance of the hydraulic plunger pump becomes better and the pump is operated more stably and reliably.
The plunger in the plunger type oil-sucking pump improves centerability of
Furthermore, the upper and lower primary sealing sleeves also serve as primary seals on both ends of the plunger.
Wherein, the upper primary sealing sleeve and the lower primary sealing sleeve are made of a wear resistant material.
The technical solution of the present invention also resides in that a plunger type oil-sucking pump comprises a pump barrel and the foregoing plunger provided in the pump barrel. Wherein, a rigid gap seal which can perform sealing in a manner the same as that of an existing conventional pump without action of hydraulic pressure is formed between each of the primary sealing sleeves provided on the both ends of the flexible sealing sleeve and the pump barrel so that oil well pressure can be borne effectively and primary sealing of the oil-sucking pump is realized. Meanwhile, since the two primary sealing sleeves, the flexible sealing sleeve and the plunger core are formed integrally, sealing performance of the whole pump is superior and the problem that oil leaks from a gap between the pump barrel and the plunger of the existing hydraulic plunger pump is avoided thus to attain stronger adaptability.
The oil-sucking pump of the present invention can improve coaxiality and ellipticity between the flexible sealing sleeve and the plunger core, eliminate eccentric wear between the flexible sealing sleeve and the pump barrel, and lower machining precision and mounting requirements for the flexible sealing sleeve so that sealing performance of the hydraulic plunger pump becomes better and the pump is operated more stably and reliably.
The plunger in the plunger type oil-sucking pump improves centerability of
4 the flexible sealing sleeve by using the structures including the liquid passing holes and the flexible sealing sleeve, effectively solves the problem that poor coaxiality and ellipticity exist between sealing members on the plunger and the pump barrel of the current hydraulic self-sealing pump, that is, eliminates eccentric wear between the pump barrel and the plunger, and also lowers machining precision and mounting requirements for the plunger. Moreover, the oil-sucking pump has better sealing performance with no leakage and possesses stronger adaptability.
The plunger of the present invention is adapted for all of hydraulic self-sealing plunger pumps and multi-plunger pumps.
Brief Description of the Drawings Fig. 1 is a structural schematic diagram showing a plunger according to a first embodiment of the present invention.
Fig. 2 is a structural schematic diagram showing a plunger type oil-sucking pump according to the first embodiment of the present invention.
Wherein, 1-upper primary sealing sleeve, 2-plunger core, 3-flexible sealing sleeve, 4-liquid passing holes, 5-lower primary sealing sleeve, 6-upper joint, 7-movable valve assembly, 8-pump barrel, 9-fixed valve assembly, 10-upper pump cavity, 11-lower pump cavity, 31-elastic body, 32-wear resistant rings.
Detailed Description of the Preferred Embodiments In order that those skilled in the art can understand technical solutions of the present invention better, a plunger for a plunger type oil-sucking pump and the plunger type oil-sucking pump containing the plunger according to the present invention will be detailedly described further below in connection with accompanying drawings as well as a specific embodiment.
The plunger for the plunger type oil-sucking pump includes a plunger core 2, wherein a number of liquid passing holes 4 are opened in an outer wall of the plunger core 2, a flexible sealing sleeve 3 having elasticity tightly encloses the outer wall of the plunger core 2, and the flexible sealing sleeve 3 is provided at such a position on the plunger core 2 as to cover said number of
The plunger of the present invention is adapted for all of hydraulic self-sealing plunger pumps and multi-plunger pumps.
Brief Description of the Drawings Fig. 1 is a structural schematic diagram showing a plunger according to a first embodiment of the present invention.
Fig. 2 is a structural schematic diagram showing a plunger type oil-sucking pump according to the first embodiment of the present invention.
Wherein, 1-upper primary sealing sleeve, 2-plunger core, 3-flexible sealing sleeve, 4-liquid passing holes, 5-lower primary sealing sleeve, 6-upper joint, 7-movable valve assembly, 8-pump barrel, 9-fixed valve assembly, 10-upper pump cavity, 11-lower pump cavity, 31-elastic body, 32-wear resistant rings.
Detailed Description of the Preferred Embodiments In order that those skilled in the art can understand technical solutions of the present invention better, a plunger for a plunger type oil-sucking pump and the plunger type oil-sucking pump containing the plunger according to the present invention will be detailedly described further below in connection with accompanying drawings as well as a specific embodiment.
The plunger for the plunger type oil-sucking pump includes a plunger core 2, wherein a number of liquid passing holes 4 are opened in an outer wall of the plunger core 2, a flexible sealing sleeve 3 having elasticity tightly encloses the outer wall of the plunger core 2, and the flexible sealing sleeve 3 is provided at such a position on the plunger core 2 as to cover said number of
5 the liquid passing holes 4 of the plunger core 2.
Wherein, the flexible sealing sleeve 3 includes an elastic body 31 and a number of wear resistant rings 32 which are embedded in the elastic body 31 at intervals in an axial direction of the elastic body 31. The elastic body 31 and the wear resistant rings 32 are formed integrally. The elastic body 31 is made of an elastic material and the wear resistant rings 32 are made of a wear resistant material.
First Embodiment As shown in Fig. 2, in this embodiment, the plunger type oil-sucking pump includes a pump barrel 8 in which components such as the plunger, an upper joint 6, a movable valve assembly 7 and a fixed valve assembly 9 are contained, and the plunger has an upper end in threaded connection with the upper joint 6 and a lower end in threaded connection with the movable valve assembly 7.
As shown in Fig. 1, in this embodiment, the plunger includes the plunger core 2, and the outer wall of the plunger core 2 is opened with a number of liquid passing holes 4 and is tightly enclosed by the flexible sealing sleeve 3, an upper primary sealing sleeve 1 and a lower primary sealing sleeve 5.
The plunger core 2 is made of a metal material and formed with an internal hollow structure, and the liquid passing holes 4 have identical shape and size.
In the present embodiment, the liquid passing holes 4 are in an oval shape.
The liquid passing holes 4 are arranged on the same level in a middle portion of the outer wall of the plunger core 2 evenly in a circumferential direction of the plunger core 2. In comprehensive consideration of penetration of liquid and strength of the plunger core 2, the number of the liquid passing holes 4 arranged on the same level of the plunger core 2 is 2-8, and preferably 4-6.
That is, one oval liquid passing hole 4 is opened by a milling process at an interval of 900 or 600 at the same axial height of the outer wall of the plunger core 2. Thus, it can be ensured that liquid in the plunger core 2 is distributed well and that the plunger core 2 has enough strength. If a length of the plunger core 2 along its axis is relatively long, a round or more rounds of liquid passing holes 4 can be added on another different level in the axial direction of the
Wherein, the flexible sealing sleeve 3 includes an elastic body 31 and a number of wear resistant rings 32 which are embedded in the elastic body 31 at intervals in an axial direction of the elastic body 31. The elastic body 31 and the wear resistant rings 32 are formed integrally. The elastic body 31 is made of an elastic material and the wear resistant rings 32 are made of a wear resistant material.
First Embodiment As shown in Fig. 2, in this embodiment, the plunger type oil-sucking pump includes a pump barrel 8 in which components such as the plunger, an upper joint 6, a movable valve assembly 7 and a fixed valve assembly 9 are contained, and the plunger has an upper end in threaded connection with the upper joint 6 and a lower end in threaded connection with the movable valve assembly 7.
As shown in Fig. 1, in this embodiment, the plunger includes the plunger core 2, and the outer wall of the plunger core 2 is opened with a number of liquid passing holes 4 and is tightly enclosed by the flexible sealing sleeve 3, an upper primary sealing sleeve 1 and a lower primary sealing sleeve 5.
The plunger core 2 is made of a metal material and formed with an internal hollow structure, and the liquid passing holes 4 have identical shape and size.
In the present embodiment, the liquid passing holes 4 are in an oval shape.
The liquid passing holes 4 are arranged on the same level in a middle portion of the outer wall of the plunger core 2 evenly in a circumferential direction of the plunger core 2. In comprehensive consideration of penetration of liquid and strength of the plunger core 2, the number of the liquid passing holes 4 arranged on the same level of the plunger core 2 is 2-8, and preferably 4-6.
That is, one oval liquid passing hole 4 is opened by a milling process at an interval of 900 or 600 at the same axial height of the outer wall of the plunger core 2. Thus, it can be ensured that liquid in the plunger core 2 is distributed well and that the plunger core 2 has enough strength. If a length of the plunger core 2 along its axis is relatively long, a round or more rounds of liquid passing holes 4 can be added on another different level in the axial direction of the
6 plunger core 2.
The flexible sealing sleeve 3 tightly encloses the outer wall of the plunger core 2 so that all the liquid passing holes 4 of the plunger core 2 can be covered. The flexible sealing sleeve 3 includes an elastic body 31 and a number of wear resistant rings 32 which are embedded in the elastic body 31 at intervals in an axial direction of the elastic body 31. The elastic body 31 and the wear resistant rings 32 are formed integrally. An outer diameter of the elastic body 31 and the wear resistant rings 32 is smaller than an inner diameter of the pump barrel 8 and matches with an outer diameter of the plunger core 2, and a spacing between two adjacent wear resistant rings 32 is shorter than a length of each of the liquid passing holes 4. The elastic body is made of synthetic rubber, and the wear resistant rings 32 are made of a wear resistant material, preferably nylon or a rigid material such as copper or steel. When liquid is filled up in the plunger core 2, hydraulic pressure directly acts on the flexible sealing sleeve 3 through the liquid passing holes 4 to cause the flexible sealing sleeve 3 to expand outward, while the liquid passing holes 4 are provided to disperse high hydraulic pressure in the plunger core 2.
In the embodiment, the elastic body 31 and the wear resistant rings 32 of the flexible sealing sleeve 3 are moulded integrally by a pouring process.
During fabrication of the flexible sealing sleeve 3, a cylindrical groove having a length greater than the length of the liquid passing holes 4 of the plunger core 2 and having an inner diameter matching with the outer diameter of the plunger core 2 is firstly formed in a corresponding mold, and a number of wear resistant rings 32 whose inner diameter matches with the outer diameter of the plunger core 2 are provided at regular intervals in the cylindrical groove and positioned fixedly. Then, the mold is overlaid on the plunger core 2 at a position corresponding to the liquid passing holes 4 of the plunger core 2 to cover the liquid passing holes 4, and each of the liquid passing holes 4 of the plunger core 2 is clogged up by a corresponding tool simultaneously. Next, molten synthetic rubber is injected into the mold, and a flexible sealing sleeve 3 in which the wear resistant rings 32 are connected tightly and integrally with the elastic body 31 is formed after cooling and moulding so that the flexible sealing sleeve 3 is formed integrally with the plunger core 2. As such, the wear
The flexible sealing sleeve 3 tightly encloses the outer wall of the plunger core 2 so that all the liquid passing holes 4 of the plunger core 2 can be covered. The flexible sealing sleeve 3 includes an elastic body 31 and a number of wear resistant rings 32 which are embedded in the elastic body 31 at intervals in an axial direction of the elastic body 31. The elastic body 31 and the wear resistant rings 32 are formed integrally. An outer diameter of the elastic body 31 and the wear resistant rings 32 is smaller than an inner diameter of the pump barrel 8 and matches with an outer diameter of the plunger core 2, and a spacing between two adjacent wear resistant rings 32 is shorter than a length of each of the liquid passing holes 4. The elastic body is made of synthetic rubber, and the wear resistant rings 32 are made of a wear resistant material, preferably nylon or a rigid material such as copper or steel. When liquid is filled up in the plunger core 2, hydraulic pressure directly acts on the flexible sealing sleeve 3 through the liquid passing holes 4 to cause the flexible sealing sleeve 3 to expand outward, while the liquid passing holes 4 are provided to disperse high hydraulic pressure in the plunger core 2.
In the embodiment, the elastic body 31 and the wear resistant rings 32 of the flexible sealing sleeve 3 are moulded integrally by a pouring process.
During fabrication of the flexible sealing sleeve 3, a cylindrical groove having a length greater than the length of the liquid passing holes 4 of the plunger core 2 and having an inner diameter matching with the outer diameter of the plunger core 2 is firstly formed in a corresponding mold, and a number of wear resistant rings 32 whose inner diameter matches with the outer diameter of the plunger core 2 are provided at regular intervals in the cylindrical groove and positioned fixedly. Then, the mold is overlaid on the plunger core 2 at a position corresponding to the liquid passing holes 4 of the plunger core 2 to cover the liquid passing holes 4, and each of the liquid passing holes 4 of the plunger core 2 is clogged up by a corresponding tool simultaneously. Next, molten synthetic rubber is injected into the mold, and a flexible sealing sleeve 3 in which the wear resistant rings 32 are connected tightly and integrally with the elastic body 31 is formed after cooling and moulding so that the flexible sealing sleeve 3 is formed integrally with the plunger core 2. As such, the wear
7 resistant rings 32 are inserted in the elastic body 31 in an embedded manner to form the flexible sealing sleeve 3 and the flexible sealing sleeve 3 tightly encloses the plunger core 2, which solves the problem that sealing members on the plunger of the conventional hydraulic self-sealing pump include a plurality of wear resistant rings having no fixed connection therebetween so that each of the wear resistant rings has poor coaxiality and ellipticity and is apt to eccentric wear, and machining precision and mounting requirements for the flexible sealing sleeve is lowered.
Threads are provided in such places on the plunger core 2 as to be engaged with both ends of the flexible sealing sleeve 3, and after the flexible sealing sleeve 3 is formed integrally with the plunger core 2, the upper primary sealing sleeve 1 is provided above the flexible sealing sleeve 3 to be in threaded connection with the plunger core 2 and has a lower end connected to an upper end of the flexible sealing sleeve 3. In this embodiment, a lower section of the plunger core 2 is formed with a step to which a lower end of the flexible sealing sleeve 3 is connected, and the lower primary sealing sleeve 5 is in threaded connection with a lower end of the plunger core 2 so that the flexible sealing sleeve 3 is axially fixed on the outer wall of the plunger core 2 between the upper primary sealing sleeve 1 and the lower primary sealing sleeve 5. The upper and lower primary sealing sleeves 1 and 5 play the role of righting the flexible sealing sleeve 3, namely, righting the whole plunger, which can effectively avoid occurrence of a phenomenon that one side of the plunger core 2 is subjected to a force and the other side of the plunger core 2 keeps close contact with the pump barrel 8 so as to cause eccentric wear between the plunger core 2 and the pump barrel 8. Both the upper primary sealing sleeve 1 and the lower primary sealing sleeve 5 are made of a wear resistant material, preferably nylon or a rigid material such as copper or steel.
When liquid is filled up in the plunger core 2, liquid spills out through the liquid passing holes 4 to cause the elastic body 31 of the flexible sealing sleeve 3 to expand outward, the flexible sealing sleeve 3 is axially fixed by the upper and lower primary sealing sleeves 1 and 5 to prevent the flexible sealing sleeve 3 from travelling up and down on the outer wall of the plunger core 2, and flexible sealing sleeve 3 is caused to be radially centered with the plunger
Threads are provided in such places on the plunger core 2 as to be engaged with both ends of the flexible sealing sleeve 3, and after the flexible sealing sleeve 3 is formed integrally with the plunger core 2, the upper primary sealing sleeve 1 is provided above the flexible sealing sleeve 3 to be in threaded connection with the plunger core 2 and has a lower end connected to an upper end of the flexible sealing sleeve 3. In this embodiment, a lower section of the plunger core 2 is formed with a step to which a lower end of the flexible sealing sleeve 3 is connected, and the lower primary sealing sleeve 5 is in threaded connection with a lower end of the plunger core 2 so that the flexible sealing sleeve 3 is axially fixed on the outer wall of the plunger core 2 between the upper primary sealing sleeve 1 and the lower primary sealing sleeve 5. The upper and lower primary sealing sleeves 1 and 5 play the role of righting the flexible sealing sleeve 3, namely, righting the whole plunger, which can effectively avoid occurrence of a phenomenon that one side of the plunger core 2 is subjected to a force and the other side of the plunger core 2 keeps close contact with the pump barrel 8 so as to cause eccentric wear between the plunger core 2 and the pump barrel 8. Both the upper primary sealing sleeve 1 and the lower primary sealing sleeve 5 are made of a wear resistant material, preferably nylon or a rigid material such as copper or steel.
When liquid is filled up in the plunger core 2, liquid spills out through the liquid passing holes 4 to cause the elastic body 31 of the flexible sealing sleeve 3 to expand outward, the flexible sealing sleeve 3 is axially fixed by the upper and lower primary sealing sleeves 1 and 5 to prevent the flexible sealing sleeve 3 from travelling up and down on the outer wall of the plunger core 2, and flexible sealing sleeve 3 is caused to be radially centered with the plunger
8 core 2 so that hydraulic self-sealing of the flexible sealing sleeve 3 with respect to the plunger core 2 can be realized. At the same time, the upper and lower primary sealing sleeves 1 and 5 on both ends of the plunger core 2 also serve as primary seals on the both ends of the plunger core 2. That is, when liquid does not reach the flexible sealing sleeve 3, the two primary sealing sleeves on the both ends of the plunger core 2 serve to address the primary sealing issue for the oil-sucking pump and bear oil well pressure.
"Centerability" of the above flexible sealing sleeve 3 depends on degree of tightness between the upper and lower primary sealing sleeves 1 and 5 and the flexible sealing sleeve 3, in which the flexible sealing sleeve 3 may protrude outward if it is too tight and the flexible sealing sleeve 3 may not implement favorable sealing if it is too loose. Adequate centerability can be obtained by regulating threads between the upper and lower primary sealing sleeves 1 and 5 and the flexible sealing sleeve 3 integrated with the plunger core 2. In the present embodiment, since the lower primary sealing sleeve 5 is not in contact with the flexible sealing sleeve 3, radial centerabilty of the flexible sealing sleeve 3 with respect to the plunger can be adjusted by only regulating tightness of the upper primary sealing sleeve 1.
As seen from above, in the embodiment, the upper primary sealing sleeve 1, the plunger core 2 provided with the liquid passing holes 4 and enclosed by the flexible sealing sleeve 3, and the lower primary sealing sleeve 5 are formed integrally to constitute the plunger having a three-segment composite sealing section which includes rigid plus elastic plus rigid sealing segments and can serve for primary sealing, centering and righting, which ensures overall sealing and hydraulic transmission of the plunger within the pump barrel and solves the problem that the wear resistant rings are not radially centered with the plunger to yield poor coaxiality and ellipticity and severe eccentric wear.
As shown in Fig. 2, in the plunger type oil-sucking pump, the ends of the upper and lower primary sealing sleeves 1 and 5 distant from the flexible sealing sleeve 3 are also provided with threads by which the upper primary sealing sleeve 1 is connected to the upper joint 6 and the lower primary sealing sleeve 5 is connected to the movable valve assembly 7. The above plunger having the three-segment composite sealing section is then assembled into
"Centerability" of the above flexible sealing sleeve 3 depends on degree of tightness between the upper and lower primary sealing sleeves 1 and 5 and the flexible sealing sleeve 3, in which the flexible sealing sleeve 3 may protrude outward if it is too tight and the flexible sealing sleeve 3 may not implement favorable sealing if it is too loose. Adequate centerability can be obtained by regulating threads between the upper and lower primary sealing sleeves 1 and 5 and the flexible sealing sleeve 3 integrated with the plunger core 2. In the present embodiment, since the lower primary sealing sleeve 5 is not in contact with the flexible sealing sleeve 3, radial centerabilty of the flexible sealing sleeve 3 with respect to the plunger can be adjusted by only regulating tightness of the upper primary sealing sleeve 1.
As seen from above, in the embodiment, the upper primary sealing sleeve 1, the plunger core 2 provided with the liquid passing holes 4 and enclosed by the flexible sealing sleeve 3, and the lower primary sealing sleeve 5 are formed integrally to constitute the plunger having a three-segment composite sealing section which includes rigid plus elastic plus rigid sealing segments and can serve for primary sealing, centering and righting, which ensures overall sealing and hydraulic transmission of the plunger within the pump barrel and solves the problem that the wear resistant rings are not radially centered with the plunger to yield poor coaxiality and ellipticity and severe eccentric wear.
As shown in Fig. 2, in the plunger type oil-sucking pump, the ends of the upper and lower primary sealing sleeves 1 and 5 distant from the flexible sealing sleeve 3 are also provided with threads by which the upper primary sealing sleeve 1 is connected to the upper joint 6 and the lower primary sealing sleeve 5 is connected to the movable valve assembly 7. The above plunger having the three-segment composite sealing section is then assembled into
9 the pump barrel 8 so as to realize sealing of the plunger type oil-sucking pump.
The above plunger is adapted for all of hydraulic self-sealing plunger pumps and multi-plunger pumps. In use, a gap larger than that in a conventional oil-sucking pump exists between the plunger and the pump barrel.
Since the flexible sealing sleeve is fixed on the outer wall of the plunger core of the plunger in the present embodiment, hydraulic self-sealing is formed and the gap between the plunger and the pump barrel disappears with no leakage when the pump runs upward, and the gap between the plunger and the pump barrel is restored and frictional resistance is reduced when the pump runs to downward.
Operating principles of the plunger type oil-sucking pump in the embodiment will be described below. In an upward stroke, the plunger is pulled upward by a sucker rod and the movable valve assembly 7 on the plunger is initially closed under liquid column pressure within an oil tube. At this time, a lower pump cavity 11 downstream the plunger is increased in volume and reduced in pressure, the fixed valve assembly 9 is opened by a difference between a submergence pressure (i.e., a pressure when an intake port of the pump is submerged to a certain depth below a liquid level) and a pressure within the pump, and fluid is sucked into the lower pump cavity 11. In the meantime, since a pressure within the upper pump cavity 10 is higher than that within the lower pump cavity 11, the composite sealing section is allowed to form a hydraulic seal. In the case that the oil tube is gradually filled up with liquid and hydraulic pressure within the plunger rises, liquid acts upon the elastic body 31 of the flexible sealing sleeve 3 through the liquid passing holes 4 of the plunger core 2 to cause the elastic body 31 to expand outward, the wear resistant rings 32 are pushed against the pump barrel 8 to form a seal, and the movable valve assembly 7 keeps closed under a differential pressure between pressures above and below itself so that liquid in the upper pump cavity 10 upstream the plunger is discharged to the ground along the oil tube.
In a downward stroke, the plunger is pushed downward by the sucker rod and the fixed valve assembly 9 is initially closed so that the plunger compresses liquid between the fixed valve assembly 9 and the movable valve assembly 7 to raise the pressure within the pump. When the pressure within the pump is raised to be higher than hydraulic pressure above the plunger, the movable valve assembly 7 is opened and liquid in the lower pump cavity 11 enters the upper pump cavity 10 through the movable valve assembly 7 so that liquid is discharged from the pump.
Here, it is to be appreciated that a ratio between a length of the flexible sealing sleeve 3 and that of the whole plunger is not fixed in the present embodiment as long as the length of the flexible sealing sleeve 3 ensures that it can cover all the liquid passing holes 4 of the plunger core 2. The length of the flexible sealing sleeve 3 can be set agilely according to the type of the hydraulic plunger pump actually used and the practical operating conditions.
In addition, in light of requirements of production and operating environment of the hydraulic plunger pump, fluorine or nitrile can be injected into the elastic body 31 of the flexible sealing sleeve 3 to make corrosion or wear resistant effect of the flexible sealing sleeve 3 better thus to accommodate production under different temperatures or corrosive conditions.
The plunger type oil-sucking pump in the present embodiment has high oil pumping efficiency with no oil leakage and operates more stably, and is adapted to complicated production conditions such as deep well, sanding with strong adaptability.
It can be understood that the above embodiment is only used as an exemplary embodiment employed to illustrate principles of the present invention and the present invention is not limited to it. It is possible for those ordinary skilled in the art to make various modifications which fall within the scope of the present invention, and such modifications are intended to fall within the appended claims.
The above plunger is adapted for all of hydraulic self-sealing plunger pumps and multi-plunger pumps. In use, a gap larger than that in a conventional oil-sucking pump exists between the plunger and the pump barrel.
Since the flexible sealing sleeve is fixed on the outer wall of the plunger core of the plunger in the present embodiment, hydraulic self-sealing is formed and the gap between the plunger and the pump barrel disappears with no leakage when the pump runs upward, and the gap between the plunger and the pump barrel is restored and frictional resistance is reduced when the pump runs to downward.
Operating principles of the plunger type oil-sucking pump in the embodiment will be described below. In an upward stroke, the plunger is pulled upward by a sucker rod and the movable valve assembly 7 on the plunger is initially closed under liquid column pressure within an oil tube. At this time, a lower pump cavity 11 downstream the plunger is increased in volume and reduced in pressure, the fixed valve assembly 9 is opened by a difference between a submergence pressure (i.e., a pressure when an intake port of the pump is submerged to a certain depth below a liquid level) and a pressure within the pump, and fluid is sucked into the lower pump cavity 11. In the meantime, since a pressure within the upper pump cavity 10 is higher than that within the lower pump cavity 11, the composite sealing section is allowed to form a hydraulic seal. In the case that the oil tube is gradually filled up with liquid and hydraulic pressure within the plunger rises, liquid acts upon the elastic body 31 of the flexible sealing sleeve 3 through the liquid passing holes 4 of the plunger core 2 to cause the elastic body 31 to expand outward, the wear resistant rings 32 are pushed against the pump barrel 8 to form a seal, and the movable valve assembly 7 keeps closed under a differential pressure between pressures above and below itself so that liquid in the upper pump cavity 10 upstream the plunger is discharged to the ground along the oil tube.
In a downward stroke, the plunger is pushed downward by the sucker rod and the fixed valve assembly 9 is initially closed so that the plunger compresses liquid between the fixed valve assembly 9 and the movable valve assembly 7 to raise the pressure within the pump. When the pressure within the pump is raised to be higher than hydraulic pressure above the plunger, the movable valve assembly 7 is opened and liquid in the lower pump cavity 11 enters the upper pump cavity 10 through the movable valve assembly 7 so that liquid is discharged from the pump.
Here, it is to be appreciated that a ratio between a length of the flexible sealing sleeve 3 and that of the whole plunger is not fixed in the present embodiment as long as the length of the flexible sealing sleeve 3 ensures that it can cover all the liquid passing holes 4 of the plunger core 2. The length of the flexible sealing sleeve 3 can be set agilely according to the type of the hydraulic plunger pump actually used and the practical operating conditions.
In addition, in light of requirements of production and operating environment of the hydraulic plunger pump, fluorine or nitrile can be injected into the elastic body 31 of the flexible sealing sleeve 3 to make corrosion or wear resistant effect of the flexible sealing sleeve 3 better thus to accommodate production under different temperatures or corrosive conditions.
The plunger type oil-sucking pump in the present embodiment has high oil pumping efficiency with no oil leakage and operates more stably, and is adapted to complicated production conditions such as deep well, sanding with strong adaptability.
It can be understood that the above embodiment is only used as an exemplary embodiment employed to illustrate principles of the present invention and the present invention is not limited to it. It is possible for those ordinary skilled in the art to make various modifications which fall within the scope of the present invention, and such modifications are intended to fall within the appended claims.
Claims (7)
1. A plunger for a plunger type oil-sucking pump, comprising a plunger core (2), characterized in that, a number of liquid passing holes (4) are opened in an outer wall of the plunger core (2), a flexible sealing sleeve (3) having elasticity tightly encloses the outer wall of the plunger core (2), and the flexible sealing sleeve (3) is provided at such a position on the plunger core (2) as to cover said number of the liquid passing holes (4) of the plunger core (2);
the outer wall of the plunger core (2) is tightly enclosed by two primary sealing sleeves including an upper primary sealing sleeve (1) and a lower primary sealing sleeve (5), the upper primary sealing sleeve (1) is provided above the flexible sealing sleeve (3) to be in threaded connection with the plunger core (2) and has a lower end connected to an upper end of the flexible sealing sleeve (3), and the lower primary sealing sleeve (5) is provided below the flexible sealing sleeve (3) to be in threaded connection with the plunger core (2) and has an upper end connected to a lower end of the flexible sealing sleeve (3);
the flexible sealing sleeve (3) includes an elastic body (31) and a number of wear resistant rings (32) which are embedded in the elastic body (31) at intervals in an axial direction of the elastic body (31), and the wear resistant rings (32) are moulded integrally with the elastic body (31) by a pouring process, so that the flexible sealing sleeve (3) is connected integrally with the plunger core (2).
the outer wall of the plunger core (2) is tightly enclosed by two primary sealing sleeves including an upper primary sealing sleeve (1) and a lower primary sealing sleeve (5), the upper primary sealing sleeve (1) is provided above the flexible sealing sleeve (3) to be in threaded connection with the plunger core (2) and has a lower end connected to an upper end of the flexible sealing sleeve (3), and the lower primary sealing sleeve (5) is provided below the flexible sealing sleeve (3) to be in threaded connection with the plunger core (2) and has an upper end connected to a lower end of the flexible sealing sleeve (3);
the flexible sealing sleeve (3) includes an elastic body (31) and a number of wear resistant rings (32) which are embedded in the elastic body (31) at intervals in an axial direction of the elastic body (31), and the wear resistant rings (32) are moulded integrally with the elastic body (31) by a pouring process, so that the flexible sealing sleeve (3) is connected integrally with the plunger core (2).
2. The plunger according to claim 1, characterized in that, said number of the liquid passing holes (4) comprise multiple liquid passing holes, and the multiple liquid passing holes (4) have identical shape and size and are collectively arranged on the same level of the plunger core (2) evenly in a circumferential direction of the plunger core (2); or said number of the liquid passing holes (4) comprise multiple liquid passing holes, the multiple liquid passing holes (4) are arranged on different levels of the plunger core (2) along an axis of the plunger core (2), in which a plurality of liquid passing holes (4) having identical shape and size are provided on any level along the axis of the plunger core (2) evenly in the circumferential direction of the plunger core (2).
3. The plunger according to claim 2, characterized in that, the number of the liquid passing holes (4) arranged on the same level of the plunger core (2) is 4-6.
4. The plunger according to claim 1, characterized in that, the elastic body (31) is made of an elastic material and the wear resistant rings (32) are made of a wear resistant material.
5. The plunger according to claim 4, characterized in that, the elastic body (31) is made of synthetic rubber and the wear resistant rings (32) are made of nylon or copper or steel.
6. The plunger according to any one of claims 1-5, characterized in that, the upper primary sealing sleeve (1) and the lower primary sealing sleeve (5) are made of a wear resistant material.
7. A plunger type oil-sucking pump, comprising a pump barrel (8) and a plunger provided in the pump barrel (8), characterized in that, said plunger is the plunger according to any one of claims 1 to 6.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2011/075607 WO2012167445A1 (en) | 2011-06-10 | 2011-06-10 | Plunger oil-well pump and its plunger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2835976A1 CA2835976A1 (en) | 2012-12-13 |
| CA2835976C true CA2835976C (en) | 2016-08-09 |
Family
ID=47295350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2835976A Expired - Fee Related CA2835976C (en) | 2011-06-10 | 2011-06-10 | Plunger type oil-sucking pump and plunger thereof |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2835976C (en) |
| MX (1) | MX2013014274A (en) |
| WO (1) | WO2012167445A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106978990B (en) * | 2017-04-24 | 2023-04-25 | 沧州润涛石油设备有限公司 | Spiral-flow type reducing oil pump |
| CN113756752B (en) * | 2021-07-23 | 2023-05-23 | 长江大学 | Two-stroke swabbing method and oil extraction device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3906845A (en) * | 1974-01-07 | 1975-09-23 | Mcneil Corp | Pump seal |
| US5372488A (en) * | 1993-09-03 | 1994-12-13 | Turner; Richard L. | Oil well pump with radially expandable interlocking seal ring |
| CN2249833Y (en) * | 1996-01-16 | 1997-03-19 | 吕新青 | Hydraulic sealing soft piston |
| US5996472A (en) * | 1996-10-07 | 1999-12-07 | Chemical Seal And Packing, Inc. | Cryogenic reciprocating pump |
| CN2644705Y (en) * | 2003-07-22 | 2004-09-29 | 范淑苹 | Highly effective sand and thick prevention expansion plunger oil well pump |
| CN100385120C (en) * | 2005-07-06 | 2008-04-30 | 大庆油田有限责任公司 | Hydraulic self-sealed plunger oil-well pump |
-
2011
- 2011-06-10 WO PCT/CN2011/075607 patent/WO2012167445A1/en active Application Filing
- 2011-06-10 CA CA2835976A patent/CA2835976C/en not_active Expired - Fee Related
- 2011-06-10 MX MX2013014274A patent/MX2013014274A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012167445A1 (en) | 2012-12-13 |
| MX2013014274A (en) | 2014-03-21 |
| CA2835976A1 (en) | 2012-12-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20131113 |
|
| MKLA | Lapsed |
Effective date: 20180611 |