CN112855508A - Pipe type oil pump - Google Patents

Pipe type oil pump Download PDF

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Publication number
CN112855508A
CN112855508A CN201911195163.9A CN201911195163A CN112855508A CN 112855508 A CN112855508 A CN 112855508A CN 201911195163 A CN201911195163 A CN 201911195163A CN 112855508 A CN112855508 A CN 112855508A
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CN
China
Prior art keywords
plunger
pump
barrel
cylinder
tubing
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Pending
Application number
CN201911195163.9A
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Chinese (zh)
Inventor
刘树高
周俊杰
郑小雄
胡南
赵留阳
王新红
陈锐
马晓雁
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Petrochina Co Ltd
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Petrochina Co Ltd
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Application filed by Petrochina Co Ltd filed Critical Petrochina Co Ltd
Priority to CN201911195163.9A priority Critical patent/CN112855508A/en
Publication of CN112855508A publication Critical patent/CN112855508A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/02—Packing the free space between cylinders and pistons
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (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

The utility model discloses a tubular oil well pump, which belongs to the field of oilfield development equipment and comprises a plunger assembly and a pump barrel assembly, wherein the plunger assembly comprises a first plunger, a second plunger and a traveling valve; the pump barrel assembly comprises a sealing barrel, a pump barrel, an intermediate barrel and a fixed valve, wherein the sealing barrel is coaxially sleeved outside the first plunger in a sealing manner, the top of the intermediate barrel is sleeved at the bottom of the sealing barrel, the bottom of the intermediate barrel is sleeved at the top of the pump barrel, the middle of the pump barrel is hermetically and coaxially sleeved outside the second plunger, the sealing barrel, the intermediate barrel, the pump barrel, the first plunger and the second plunger form an annular cavity, a through hole communicated with the annular cavity is formed in the intermediate barrel, and the fixed valve is installed on the pump barrel. The oil well pump can be deepened under the premise of not increasing the production cost, and the production efficiency is improved.

Description

Pipe type oil pump
Technical Field
The utility model belongs to the field of oil field development equipment, in particular to tubular oil-well pump.
Background
In a sucker-rod pumping system, the pumping unit generally includes a ground driving device, i.e., a beam-pumping unit, a tubing pump mounted at the lower portion of the tubing string, and a sucker rod string for transmitting the motion and power of the ground device to the downhole tubing pump and pumping the produced fluid of the oil reservoir to the ground through the tubing pump.
When the pumping unit is used in mechanical oil extraction in oil field, the tubular oil well pump is lowered to below the dynamic liquid level in oil well via oil pipe to pump liquid in oil well.
However, with the development of the oil field in the middle and later periods, the formation energy is continuously reduced, the dynamic liquid level of the oil well is reduced, and the pump efficiency is reduced. The development and production unit mostly adopts the measure of deepening the pump hanger for improving the pump efficiency, but along with the great deepening of the pump hanger depth, the load of a ground pumping unit walking beam suspension point is also greatly increased, and even a bigger ground pumping unit model has to be replaced, so that the operation energy consumption is finally increased, the production and operation cost is increased, and the economic benefit is reduced.
Disclosure of Invention
The embodiment of the disclosure provides a tubular oil well pump, which can be used for pumping crude oil in an oil well under the conditions of not increasing the suspension point load of a ground beam pumping unit and not increasing the energy consumption. The technical scheme is as follows:
the embodiment of the disclosure provides a tubular oil well pump, which comprises a plunger assembly and a pump barrel assembly,
the plunger assembly comprises a first plunger, a second plunger and a traveling valve, the inner diameter of the first plunger is smaller than that of the second plunger, the bottom of the first plunger is coaxially inserted into the top of the second plunger, the first plunger is communicated with the interior of the second plunger, and the traveling valve is arranged at the bottom end of the second plunger;
the pump barrel assembly comprises a sealing barrel, a pump barrel, an intermediate barrel and a fixed valve, wherein the sealing barrel is coaxially sleeved with a sealing barrel in the outside of the first plunger, the top of the intermediate barrel is sleeved with the bottom of the sealing barrel, the bottom of the intermediate barrel is sleeved with the top of the pump barrel, the middle of the pump barrel is coaxially sleeved with a sealing barrel in the outside of the second plunger, the bottom end face of the sealing barrel is arranged on the inner wall of the intermediate barrel, the inner wall of the pump barrel is arranged on the outer wall of the first plunger, and the top end face of the second plunger form an annular cavity, a through hole communicated with the annular cavity is formed in the intermediate barrel, and the fixed valve is installed at the bottom end of the pump barrel.
In one implementation of the present disclosure, the plunger assembly further includes a connection joint, two ends of the connection joint are respectively connected between the first plunger and the second plunger, the connection joint and the first plunger are coaxially arranged, and the inside of the connection joint is communicated with the inside of the first plunger and the inside of the second plunger.
In another implementation manner of the present disclosure, the top of the connection joint is sleeved at the bottom of the first plunger, the outer wall of the connection joint is provided with an outer flange, the top of the second plunger is sleeved at the bottom of the connection joint, the top end face of the second plunger is abutted against one side face of the outer flange, and the bottom end face of the sealing cylinder, the inner wall of the middle cylinder, the inner wall of the pump cylinder, the outer wall of the first plunger and the other side face of the outer flange form the ring cavity.
In yet another implementation of the present disclosure, the inner diameter of the connection joint is the same as the inner diameter of the first plunger, and the outer diameter of the outer flange is the same as the outer diameter of the second plunger.
In another implementation manner of the present disclosure, an annular mounting groove is disposed on the sidewall of the first plunger near the bottom, the mounting groove is disposed coaxially with the first plunger, the top thread of the connection joint is installed in the mounting groove, and the bottom thread of the connection joint is inserted into the top of the second plunger.
In yet another implementation of the present disclosure, the first plunger has a length greater than a length of the second plunger.
In yet another implementation of the present disclosure, the plunger assembly further comprises a sucker rod adapter installed on the top end of the first plunger, the interior of the sucker rod adapter communicating with the interior of the first plunger.
In another implementation manner of the present disclosure, a plurality of liquid outlet grooves are formed on a side wall of the sucker rod joint, each liquid outlet groove is communicated with the inside of the sucker rod joint, and each liquid outlet groove is uniformly and circumferentially distributed on the sucker rod joint.
In yet another implementation of the present disclosure, the pump barrel assembly further includes a first tubing fitting that is nested on top of the seal barrel.
In another implementation manner of the present disclosure, the pump barrel assembly further includes a second oil pipe joint, the second oil pipe joint is sleeved at the bottom of the pump barrel, and the fixed valve is installed inside the second oil pipe joint.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the tubing pump provided by the embodiment of the disclosure is used for pumping an oil well, as the plunger assembly in the tubing pump comprises the first plunger, the second plunger and the traveling valve, the pump barrel assembly comprises the sealing barrel, the pump barrel, the middle barrel and the fixed valve, when the sucker rod drives the first plunger and the second plunger to move downwards, the sealing cylinder, the middle cylinder and the pump cylinder are kept static, the first plunger and the second plunger pressurize oil in a cavity formed between the traveling valve and the fixed valve, when the oil pressure in the cavity is increased to be larger than the sinking pressure of the oil well pump, the fixed valve is closed, and when the oil pressure in the cavity is higher than the pressure of the liquid column above the second plunger, the traveling valve is opened, oil below the second plunger enters the second plunger and the first plunger through the traveling valve and finally enters an oil pipe at the top end of the first plunger, so that the oil well pump discharges the oil. Meanwhile, oil in the working fluid level communicated with the annular cavity can continuously enter the annular cavity through the through hole, so that the oil pressure in the annular cavity is the same as that of the working fluid level.
When the sucker rod drives the first plunger and the second plunger to move upwards, the traveling valve is closed under the action of the pressure of the liquid column in the second plunger, the volume of a cavity formed between the traveling valve and the fixed valve is increased, the pressure is reduced, the fixed valve is opened under the action of the pressure difference between the upper pressure and the lower pressure, raw oil in the stratum enters the cavity formed between the traveling valve and the fixed valve, and meanwhile, the oil in the annular cavity can also be continuously cut off from the through hole. Because the internal diameter of the first plunger is smaller than that of the second plunger, a stress surface is generated at the joint between the second plunger and the first plunger, the upper part of the stress surface is the bottom end of the annular cavity, and the lower part of the stress surface is the internal joint of the first plunger and the second plunger. Therefore, the upper part of the force-bearing surface is subjected to the same pressure as the working fluid level, and the lower part of the force-bearing surface is subjected to the same pressure as the fluid column above the second plunger. And because the pressure of the liquid column above the second plunger is greater than that of the working fluid level, an upward acting force can be generated when the stress surface moves upwards on the sucker rod to assist the sucker rod to move upwards. That is to say, can reduce beam-pumping unit walking beam hanging point load, can deepen the pump under the condition of not using large-scale beam-pumping unit promptly and hang, and then improve the productivity effect, reduce cost. The tubular oil well pump in the embodiment has a simple structure, namely the pump hanger can be deepened on the premise of not increasing the production cost, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a half sectional view of a tubing pump according to an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1. a plunger assembly; 11. a first plunger; 111. mounting grooves; 12. a second plunger; 13. a traveling valve; 14. the sucker rod connects; 141. a liquid outlet groove; 15. connecting a joint; 151. an outer flange;
2. a pump barrel assembly; 21. a sealing cylinder; 22. a pump barrel; 23. an intermediate barrel; 230. a ring cavity; 231. a through hole; 24. a fixed valve; 25. a first tubing joint; 26. a second tubing joint.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The embodiment of the present disclosure provides a tubular oil well pump, as shown in fig. 1, the tubular oil well pump includes a plunger assembly 1 and a pump barrel assembly 2, the plunger assembly 1 includes a first plunger 11, a second plunger 12 and a traveling valve 13, the inner diameter of the first plunger 11 is smaller than the inner diameter of the second plunger 12, the bottom of the first plunger 11 is coaxially inserted into the top of the second plunger 12, the first plunger 11 is communicated with the inside of the second plunger 12, and the traveling valve 13 is installed on the bottom of the second plunger 12.
The pump barrel assembly 2 comprises a sealing barrel 21, a pump barrel 22, an intermediate barrel 23 and a fixed valve 24, the sealing barrel 21 is coaxially sleeved outside the first plunger 11 in a sealing manner, the top of the intermediate barrel 23 is sleeved at the bottom of the sealing barrel 21, the bottom of the intermediate barrel 23 is sleeved at the top of the pump barrel 22, the middle of the pump barrel 22 is sleeved outside the second plunger 12 in a sealing manner, the bottom end face of the sealing barrel 21, the inner wall of the intermediate barrel 23, the inner wall of the pump barrel 22, the outer wall of the first plunger 11 and the top end face of the second plunger 12 form an annular cavity 230, a through hole 231 communicated with the annular cavity 230 is formed in the intermediate barrel 23, and the fixed valve 24 is installed at the bottom end of the pump barrel 22.
When the tubing pump provided by the embodiment of the disclosure is used for pumping an oil well, as the plunger assembly in the tubing pump comprises the first plunger, the second plunger and the traveling valve, the pump barrel assembly comprises the sealing barrel, the pump barrel, the middle barrel and the fixed valve, when the sucker rod drives the first plunger and the second plunger to move downwards, the sealing cylinder, the middle cylinder and the pump cylinder are kept static, the first plunger and the second plunger pressurize oil in a cavity formed between the traveling valve and the fixed valve, when the oil pressure in the cavity is increased to be larger than the sinking pressure of the oil well pump, the fixed valve is closed, and when the oil pressure in the cavity is higher than the pressure of the liquid column above the second plunger, the traveling valve is opened, oil below the second plunger enters the second plunger and the first plunger through the traveling valve and finally enters an oil pipe at the top end of the first plunger, so that the oil well pump discharges the oil. Meanwhile, oil in the working fluid level communicated with the annular cavity can continuously enter the annular cavity through the through hole, so that the oil pressure in the annular cavity is the same as that of the working fluid level.
When the sucker rod drives the first plunger and the second plunger to move upwards, the traveling valve is closed under the action of the pressure of the liquid column in the second plunger, the volume of a cavity formed between the traveling valve and the fixed valve is increased, the pressure is reduced, the fixed valve is opened under the action of the pressure difference between the upper pressure and the lower pressure, raw oil in the stratum enters the cavity formed between the traveling valve and the fixed valve, and meanwhile, the oil in the annular cavity can also be continuously cut off from the through hole. Because the internal diameter of the first plunger is smaller than that of the second plunger, a stress surface is generated at the joint between the second plunger and the first plunger, the upper part of the stress surface is the bottom end of the annular cavity, and the lower part of the stress surface is the internal joint of the first plunger and the second plunger. Therefore, the upper part of the force-bearing surface is subjected to the same pressure as the working fluid level, and the lower part of the force-bearing surface is subjected to the same pressure as the fluid column above the second plunger. And because the pressure of the liquid column above the second plunger is greater than that of the working fluid level, an upward acting force can be generated when the stress surface moves upwards on the sucker rod to assist the sucker rod to move upwards. That is to say, can reduce beam-pumping unit walking beam hanging point load, can deepen the pump under the condition of not using large-scale beam-pumping unit promptly and hang, and then improve the productivity effect, reduce cost. The tubular oil well pump in the embodiment has a simple structure, namely the pump hanger can be deepened on the premise of not increasing the production cost, and the production efficiency is improved.
It should be noted that an upward thrust generated by the force-bearing surface when the sucker rod goes upward can be calculated by the following formula: f ═ PPressure of liquid column in second plunger-PPressure of annular cavity)×(SSecond plunger cross section-SFirst plunger cross section). Wherein, PPressure of liquid column in second plungerI.e. the liquid pressure of the liquid column above the bottom of the second plunger, can be calculated according to the liquid pressure formula, PPressure of annular cavityNamely the pressure in the annular cavity, the pressure can be calculated according to the specific position of the oil well pump which is placed down in the oil well and by combining a liquid pressure formula. SSecond plunger cross sectionI.e. the cross-sectional area, S, of the second plungerFirst plunger cross sectionI.e. the cross-sectional area of the first plunger.
In this embodiment, when the tubing pump is used for pumping crude oil in an oil well, the working fluid level outside the tubing string in the oil well is low, and is generally 200-500 m deep in the oil well, i.e. 200-500 m on the so-called pump hanger, so that in order to achieve the purpose that the oil well is not reduced in production due to the load reduction of the surface pumping unit, the tubing pump in this embodiment can form more than one upward thrust, i.e. the load reduction force F ═ (P ═ isPressure of liquid column in second plunger-PPressure of annular cavity)×(SSecond plunger cross section-SFirst plunger cross section). Generally, the load of the tubing pump can be reduced by 1.2-2.4 tons in practical use, so that the aim of deepening a pump hanger by 300-700 meters or increasing the pump diameter (upgrading the pump) under the same load can be fulfilled on the premise of not increasing the load of a ground pumping unit.
Optionally, the length of the first plunger 11 is greater than the length of the second plunger 12.
In the above implementation manner, when the length of the first plunger 11 is greater than that of the second plunger 12, it is ensured that a liquid column formed by crude oil liquid sucked into the plunger assembly 1 is higher, so as to further increase the internal pressure at the force bearing surface between the first plunger 11 and the second plunger 12, and further increase the upward thrust of the force bearing surface between the first plunger 11 and the second plunger 12. If the upward pushing force at the force-bearing surface is to be further increased, the length of the first plunger 11 can be further increased. At the same time, however, the structural strength of the first plunger 11 is also considered, so the length relationship between the first plunger 11 and the second plunger 12 can be selected appropriately according to actual requirements.
Optionally, the plunger assembly 1 further comprises a connecting joint 15, two ends of the connecting joint 15 are respectively connected between the first plunger 11 and the second plunger 12, the connecting joint 15 and the first plunger 11 are coaxially arranged, and the inside of the connecting joint 15 is communicated with the inside of the first plunger 11 and the second plunger 12.
In the above implementation, the connection joint 15 is provided to easily and firmly assemble the first plunger 11 and the second plunger 12 together, and can ensure that the first plunger 11 is communicated with the inside of the second plunger 12, so as to realize the linkage between the first plunger 11 and the second plunger 12.
Illustratively, the connection sub 15 may be a turnbuckle inner through nipple.
The top of the connecting joint 15 is sleeved at the bottom of the first plunger 11, the outer wall of the connecting joint 15 is provided with an outer flange 151, the top of the second plunger 12 is sleeved at the bottom of the connecting joint 15, the top end face of the second plunger 12 abuts against one side face of the outer flange 151, and the bottom end face of the sealing barrel 21, the inner wall of the middle barrel 23, the inner wall of the pump barrel 22, the outer wall of the first plunger 11 and the other side face of the outer flange 151 form an annular cavity 230.
In the above implementation manner, because the outer flange 151 is arranged on the connection joint 15, the connection joint 15 can realize variable-diameter connection, connection between the first plunger 11 and the second plunger 12 with different inner diameters and outer diameters is facilitated, and meanwhile, the arrangement of the outer flange 151 can enable pressure of a dynamic liquid surface borne outside a stress surface between the first plunger 11 and the second plunger 12 to be transferred to the top of the outer flange 151, that is, the top of the outer flange 151 is one side of the stress surface.
Alternatively, the inside diameter of the connection sub 15 is the same as the inside diameter of the first plunger 11 and the outside diameter of the outer flange 151 is the same as the outside diameter of the second plunger 12.
In the above implementation, the inner diameter of the connection joint 15 is the same as the inner diameter of the first plunger 11, and the outer diameter of the outer flange 151 is the same as the outer diameter of the second plunger 12, so that a joint between the first plunger 11 and the second plunger 12 forms a force-bearing surface with different inner and outer sides, that is, the top of the outer side of the force-bearing surface bears the pressure of the working fluid surface, and the inner side of the force-bearing surface bears the pressure of the fluid column above the second plunger 12. From this, when the first plunger 11 and the second plunger 12 of this oil-well pump went upward along with the sucker rod, received the effect of fluid column pressure, the stress surface inboard just can produce an ascending thrust, this thrust is the size of fluid column pressure, and the stress surface outside is owing to communicate with annular cavity, so the stress surface outside can produce a decurrent pressure, and because fluid column pressure is greater than the inside liquid pressure of annular cavity, so just can produce an ascending thrust in stress surface inboard department, and then realize this oil-well pump deepening pump-hanging under the prerequisite that does not increase ground beam-pumping unit load.
Optionally, an annular mounting groove 111 is formed in the side wall of the first plunger 11 at a position close to the bottom, the mounting groove 111 is arranged coaxially with the first plunger 11, the top thread of the connecting joint 15 is installed in the mounting groove 111, and the bottom thread of the connecting joint 15 is inserted into the top of the second plunger 12.
In the above implementation manner, due to the arrangement of the annular mounting groove 111, the connection joint 15 can be screwed on the bottom end of the first plunger 11, and simultaneously, the second plunger 12 is connected to the connection joint 15 conveniently by combining the arrangement of the outer flange 151.
Illustratively, the first plunger 11 is internally provided with a smooth through pipe, the top end and the bottom end of the through pipe are respectively provided with external threads, and the outer wall of the first plunger 11 is high in smoothness and is a mechanical seal in clearance fit with the sealing barrel 21. The top end and the bottom end of the second plunger 12 are both provided with internal threads, the rest of the interior is a smooth through pipe, the outer wall of the second plunger 12 is high-finish, and the outer wall of the second plunger is a mechanical seal in clearance fit with the inner wall of the pump barrel 22.
Optionally, the plunger assembly 1 further comprises a sucker rod joint 14, the sucker rod joint 14 is mounted on the top end of the first plunger 11, and the inside of the sucker rod joint 14 is communicated with the inside of the first plunger 11.
In the above implementation, the sucker rod joint 14 is used to connect the top end of the first plunger 11 with the sucker rod string, so that the first plunger 11 can move up and down along with the sucker rod string, and crude oil is conveniently pumped.
Optionally, a plurality of liquid outlet grooves 141 are provided on the side wall of the sucker rod joint 14, each liquid outlet groove 141 is communicated with the inside of the sucker rod joint 14, and the liquid outlet grooves 141 are uniformly and circumferentially distributed on the sucker rod joint 14.
In the above implementation, the liquid outlet groove 141 is used for discharging the crude oil liquid sucked inside the first plunger 11 to the oil pipe outside the sucker rod joint 14.
Illustratively, each liquid outlet groove 141 is long, and the length direction of each liquid outlet groove 141 is parallel to the axis of the sucker rod joint 14.
Illustratively, the number of the liquid outlet grooves 141 may be three, and the three liquid outlet grooves 141 are evenly distributed on the side wall of the sucker rod joint 14 along the circumferential direction of the sucker rod joint 14. It is understood that the number of the liquid outlet grooves 141 may be other numbers, which is not limited in this embodiment.
Illustratively, both ends of the intermediate cylinder 23 are provided with internal threads, and both ends of the intermediate cylinder 23 are screw-fitted to the outside of the sealing cylinder 21 and the pump cylinder 22.
In the above implementation, the middle cylinder 23 is provided with internal threads at both ends thereof to facilitate connection with the sealing cylinder 21 and the pump cylinder 22, and to facilitate formation of the annular cavity 230.
Optionally, the pump barrel assembly 2 further comprises a first oil pipe connector 25, and the first oil pipe connector 25 is sleeved on the top of the sealing barrel 21.
In the above implementation manner, the first oil pipe joint 25 is arranged to facilitate connection of the oil pipe at the top of the sealing barrel 21, and the oil pipe is sleeved outside the sucker rod joint 14, so that the crude oil flowing out of the sucker rod joint 14 enters the oil pipe, and finally the crude oil is extracted to the ground through the oil pipe.
Illustratively, the first tubing connector 25 may be a 2-7/8 flat tubing coupling with an external light and an internal light, and the first tubing connector 25 is internally threaded at both ends, wherein one end of the first tubing connector 25 is internally threaded to the seal cartridge 21 and the other end of the first tubing connector 25 is internally threaded to the tubing.
Optionally, the barrel assembly 2 further comprises a second oil pipe connector 26, the second oil pipe connector 26 is sleeved on the bottom of the barrel 22, and the fixed valve 24 is installed inside the second oil pipe connector 26.
In the above implementation, the provision of the second tubing connector 26 facilitates the connection of a tailpipe on the bottom of the pump barrel 22, while also facilitating the installation of the fixed valve 24 inside the second tubing connector 26.
For example, the second oil pipe joint 26 may be a through pipe with different calibers at two ends, an internal thread matched with the fixed valve 24 is arranged inside the second oil pipe joint 26, the caliber of one end of the second oil pipe joint 26 close to the pump barrel is larger than the caliber of the other end, an internal thread matched with the pump barrel 22 is arranged inside one end of the second oil pipe joint 26 close to the pump barrel, and an internal thread is arranged outside one end of the second oil pipe joint 26 far away from the pump barrel.
Illustratively, the traveling valve 13 may be a check valve, and the traveling valve 13 includes a valve housing, a valve seat, a valve ball, and a flow guiding head, wherein the valve housing is externally provided with a thread connected to the bottom of the second plunger 12, the valve housing is screw-fitted in the second plunger 12, the valve seat is mounted at the bottom inside the valve housing, the valve ball is mounted on the valve seat, and the flow guiding head is mounted at the top of the valve housing.
In the above implementation, the traveling valve 13 is a check valve, which ensures that the raw oil in the tubing pump flows only from the second end of the second plunger 12 to the first end of the second plunger 12, but not vice versa.
When the sucker rod drives the first plunger and the second plunger to move upwards, the traveling valve is closed under the action of the pressure of the liquid column in the second plunger, when the sucker rod drives the first plunger and the second plunger to move downwards, the oil pressure of a cavity between the traveling valve and the fixed valve is increased, when the oil pressure is increased to be larger than the pressure of the liquid column in the second plunger, the traveling valve is jacked open, and the liquid below the second plunger enters the upper part of the second plunger through the traveling valve.
It should be noted that the traveling valve 13 provided in this embodiment may be a traveling valve that is relatively common in oil well pumps, and therefore, the specific structure of the traveling valve will not be described in detail herein.
Illustratively, the fixed valve 24 may be a check valve, which includes a valve ball, a valve seat and a valve cover, the valve cover is fixedly installed inside the second oil pipe joint 26, the valve seat is installed at the bottom end inside the valve cover, and the valve ball is movably installed on the valve seat.
In the above implementation, the fixed valve 24 is a check valve, which ensures that the flow of the crude oil in the oil pump can only flow from the outside of the pump cylinder 22 to the inside of the pump cylinder 22, but not vice versa.
It should be noted that the fixed valve 24 provided in the present embodiment may be a traveling valve which is relatively common in oil well pumps, and therefore, the specific structure of the fixed valve 24 will not be described in detail herein.
The operation of the oil well tubing pump provided by the embodiments of the present disclosure is described as follows:
the tubular oil well pump is arranged in an oil well casing, so that the working fluid level of the oil well is above an oil inlet of the tubular oil pumping pipe pump, and the pressure in a ring cavity of the tubular oil well pump is equal to the hydraulic pressure at the working fluid level of the oil well as the pressure in the ring cavity is communicated with the working fluid level of the oil well;
in addition, this tubular oil-well pump is when carrying out the swabbing crude oil, first plunger and the inside crude oil that is full of second plunger, this moment, the stress surface department between first plunger and second plunger can produce powerful hydraulic pressure, and this hydraulic pressure is greater than the pressure in the annular space far away, this moment, produce powerful pressure difference on first plunger and second plunger stress surface, and this pressure difference alright produce an ascending thrust to the second plunger, through this deloading power can realize under the prerequisite that does not increase ground beam-pumping unit load, the same pump footpath, deepening pump hanging, or under same load, the purpose of increase pump footpath pump upgrading, and then improve productivity effect, reduce cost.
The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims (10)

1. The utility model provides a tubing pump, tubing pump includes plunger subassembly (1) and pump barrel subassembly (2), its characterized in that, plunger subassembly (1) includes first plunger (11), second plunger (12) and traveling valve (13), the internal diameter of first plunger (11) is less than the internal diameter of second plunger (12), the coaxial cartridge in bottom of first plunger (11) is in the top of second plunger (12), and first plunger (11) communicates with each other with second plunger (12) inside, traveling valve (13) are installed on the bottom of second plunger (12);
the pump cylinder assembly (2) comprises a sealing cylinder (21), a pump cylinder (22), an intermediate cylinder (23) and a fixed valve (24), the sealing cylinder (21) is coaxially and hermetically arranged outside the first plunger (11), the top of the middle cylinder (23) is sleeved at the bottom of the sealing cylinder (21), the bottom of the middle cylinder (23) is sleeved at the top of the pump cylinder (22), the middle part of the pump cylinder (22) is hermetically and coaxially sleeved outside the second plunger (12), the bottom end face of the seal cylinder (21), the inner wall of the intermediate cylinder (23), the inner wall of the pump cylinder (22), the outer wall of the first plunger (11), and the top end face of the second plunger (12) form an annular cavity (230), the middle cylinder (23) is provided with a through hole (231) communicated with the ring cavity (230), and the fixed valve (24) is installed on the bottom end of the pump cylinder (22).
2. The tubing pump according to claim 1, wherein the plunger assembly (1) further comprises a connection joint (15), two ends of the connection joint (15) are respectively connected between the first plunger (11) and the second plunger (12), the connection joint (15) and the first plunger (11) are coaxially arranged, and the inside of the connection joint (15) is communicated with the inside of the first plunger (11) and the second plunger (12).
3. The tubing pump of claim 2, wherein the top of the connection joint (15) is sleeved on the bottom of the first plunger (11), the outer wall of the connection joint (15) is provided with an outer flange (151), the top of the second plunger (12) is sleeved on the bottom of the connection joint (15), the top end face of the second plunger (12) abuts against one side face of the outer flange (151), and the bottom end face of the sealing barrel (21), the inner wall of the middle barrel (23), the inner wall of the pump barrel (22), the outer wall of the first plunger (11) and the other side face of the outer flange (151) form the ring cavity (230).
4. The tubing pump according to claim 3, wherein the inner diameter of the connection nipple (15) is the same as the inner diameter of the first plunger (11) and the outer diameter of the outer flange (151) is the same as the outer diameter of the second plunger (12).
5. The tubing pump of claim 2, wherein an annular mounting groove (111) is formed in the side wall of the first plunger (11) near the bottom, the mounting groove (111) is arranged coaxially with the first plunger (11), the top thread of the connection joint (15) is arranged in the mounting groove (111), and the bottom thread of the connection joint (15) is inserted into the top of the second plunger (12).
6. The tubing pump according to any of claims 1-5, wherein the length of the first plunger (11) is greater than the length of the second plunger (12).
7. The tubing pump of any of claims 1-5, wherein the plunger assembly (1) further comprises a sucker rod fitting (14), the sucker rod fitting (14) being mounted on the top end of the first plunger (11), the interior of the sucker rod fitting (14) being in communication with the interior of the first plunger (11).
8. The tubing pump of claim 7, wherein the sucker rod connector (14) has a plurality of fluid outlets (141) on a sidewall thereof, each fluid outlet (141) is connected to an interior of the sucker rod connector (14), and the fluid outlets (141) are uniformly and circumferentially distributed on the sucker rod connector (14).
9. The pump assembly of claim 1, wherein the pump barrel assembly (2) further comprises a first tubing connector (25), the first tubing connector (25) being fitted over the top of the seal barrel (21).
10. The pump assembly of claim 1, wherein the barrel assembly (2) further comprises a second tubing connector (26), the second tubing connector (26) being mounted to the bottom of the barrel (22), the standing valve (24) being mounted within the second tubing connector (26).
CN201911195163.9A 2019-11-28 2019-11-28 Pipe type oil pump Pending CN112855508A (en)

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Application Number Priority Date Filing Date Title
CN201911195163.9A CN112855508A (en) 2019-11-28 2019-11-28 Pipe type oil pump

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2399531Y (en) * 1999-11-05 2000-10-04 石油大学(北京) Hydraulic feedback anti-sand pump for flexible continuous sucker rod
CN1904363A (en) * 2005-07-26 2007-01-31 凌建军 Method and device of improving effect of rod oil pump and realizing energy saving of rod oil pump
US20080135259A1 (en) * 2005-04-11 2008-06-12 Brown T Leon Reciprocated Pump System For Use In Oil Wells
CN102877832A (en) * 2012-09-14 2013-01-16 中国石油天然气股份有限公司 Method and system for measuring movable liquid surface of oil well
CN203756135U (en) * 2014-03-06 2014-08-06 中国石油化工股份有限公司 Assistant pumping device for deep well
CN204126866U (en) * 2014-10-14 2015-01-28 成都北方石油勘探开发技术有限公司 A kind of double-deck off-load deep-well oil pump
CN205638377U (en) * 2016-04-20 2016-10-12 中国石油天然气股份有限公司 Oil recovery well laod shedding equipment
CN209195663U (en) * 2018-08-27 2019-08-02 中国石油天然气股份有限公司 A kind of oil well pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2399531Y (en) * 1999-11-05 2000-10-04 石油大学(北京) Hydraulic feedback anti-sand pump for flexible continuous sucker rod
US20080135259A1 (en) * 2005-04-11 2008-06-12 Brown T Leon Reciprocated Pump System For Use In Oil Wells
CN1904363A (en) * 2005-07-26 2007-01-31 凌建军 Method and device of improving effect of rod oil pump and realizing energy saving of rod oil pump
CN102877832A (en) * 2012-09-14 2013-01-16 中国石油天然气股份有限公司 Method and system for measuring movable liquid surface of oil well
CN203756135U (en) * 2014-03-06 2014-08-06 中国石油化工股份有限公司 Assistant pumping device for deep well
CN204126866U (en) * 2014-10-14 2015-01-28 成都北方石油勘探开发技术有限公司 A kind of double-deck off-load deep-well oil pump
CN205638377U (en) * 2016-04-20 2016-10-12 中国石油天然气股份有限公司 Oil recovery well laod shedding equipment
CN209195663U (en) * 2018-08-27 2019-08-02 中国石油天然气股份有限公司 A kind of oil well pump

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