CN114483551B - Piston pump system - Google Patents

Piston pump system Download PDF

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Publication number
CN114483551B
CN114483551B CN202011262562.5A CN202011262562A CN114483551B CN 114483551 B CN114483551 B CN 114483551B CN 202011262562 A CN202011262562 A CN 202011262562A CN 114483551 B CN114483551 B CN 114483551B
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CN
China
Prior art keywords
assembly
plunger
reversing valve
pump
valve body
Prior art date
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Active
Application number
CN202011262562.5A
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Chinese (zh)
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CN114483551A (en
Inventor
王丽娜
段宝玉
马纪翔
熊巍
段冉
程清扬
郝丽
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Petrochina Co Ltd
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Petrochina Co Ltd
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Publication date
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Priority to CN202011262562.5A priority Critical patent/CN114483551B/en
Publication of CN114483551A publication Critical patent/CN114483551A/en
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Publication of CN114483551B publication Critical patent/CN114483551B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
    • F04B47/08—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth the motors being actuated by fluid
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
    • 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
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/38—Arrangements for separating materials produced by the well in the well
    • 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
    • F04B53/1002—Ball 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
    • F04B9/131—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members
    • F04B9/133—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (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

本申请公开了一种柱塞泵系统，属于气井采气技术领域。本申请实施例提供的柱塞泵系统，在第一换向阀组件和第二换向阀组件上分别设置进气孔，通过该进气孔引入位于待处理的井筒内的天然气，利用该天然气的压力驱动气动泵泵筒中的气动泵柱塞做上下往复运动，进而带动第一柱塞泵总成和第二柱塞泵总成做上下往复运动，从而进行排水作业。由此可见，本申请在进行排水作业时利用井筒内天然气的压力作为驱动动力，而无需采用价格高昂的排水设备，降低了作业成本。

The present application discloses a plunger pump system, which belongs to the field of gas well gas extraction technology. The plunger pump system provided by the embodiment of the present application has air inlets respectively arranged on the first reversing valve assembly and the second reversing valve assembly, and the natural gas located in the wellbore to be processed is introduced through the air inlet holes, and the pressure of the natural gas is used to drive the pneumatic pump plunger in the pneumatic pump barrel to reciprocate up and down, thereby driving the first plunger pump assembly and the second plunger pump assembly to reciprocate up and down, thereby performing drainage operations. It can be seen that the present application uses the pressure of the natural gas in the wellbore as the driving force when performing drainage operations, without the need to use expensive drainage equipment, thereby reducing operating costs.

Description

Plunger pump system
Technical Field
The application relates to the technical field of gas well gas production. And more particularly to a plunger pump system.
Background
With the continuous development of natural gas fields, the formation pressure gradually decreases, the gas production gradually decreases, the liquid carrying capacity of the gas gradually becomes poor, and water in the formation gradually gathers in a shaft to form effusion. Formation of dropsy in the well bore can lead to reduced gas production and, in severe cases, to gas well blowout. Thus, drainage of the fluid in the wellbore is required.
In the related art, the drainage operation is mainly performed through composite technologies such as mechanical pumping, an electric submersible pump, a foam drainage and the like, when the position of the accumulated liquid is deeper, the foam drainage can be adopted first, and the accumulated liquid is discharged in a foam mode. When the position of the accumulated liquid is shallow and the accumulated liquid amount is large, the electric submersible pump is adopted to drain, and when the position of the accumulated liquid is shallow and the accumulated liquid amount is small, the machine pump is adopted to drain.
However, since the electric submersible pump and the mechanical pump are expensive, the related art has a high cost because of high investment for performing the drainage operation.
Disclosure of Invention
The embodiment of the application provides a plunger pump system which can reduce the cost of drainage operation. The specific technical scheme is as follows:
An embodiment of the present application provides a plunger pump system, including: a first plunger pump assembly, a pneumatic pump assembly, and a second plunger pump assembly;
The pneumatic pump assembly includes: the device comprises a first reversing valve assembly, a pneumatic pump plunger, a pneumatic pump barrel, a first pneumatic piston connecting rod, a second pneumatic piston connecting rod and a second reversing valve assembly;
The upper end of the pneumatic pump cylinder is connected with the first plunger pump assembly through the first reversing valve assembly, and the lower end of the pneumatic pump cylinder is connected with the second plunger pump assembly through the second reversing valve assembly;
The pneumatic pump cylinder is internally provided with the pneumatic pump plunger, the upper end of the pneumatic pump plunger is connected with the first plunger pump assembly through the first pneumatic piston connecting rod, and the lower end of the pneumatic pump plunger is connected with the second plunger pump assembly through the second pneumatic piston connecting rod;
The first reversing valve assembly and the second reversing valve assembly are respectively provided with a first air inlet hole for introducing natural gas in a shaft to be treated, and the pneumatic pump plunger is driven by the natural gas to reciprocate up and down so as to drive the first plunger pump assembly and the second plunger pump assembly to reciprocate up and down;
The first plunger pump assembly and the second plunger pump assembly are used for conducting drainage operation in the up-and-down reciprocating motion process.
In one possible implementation, the system further includes: a seat seal assembly and a gas-liquid separator;
the upper end of the seat seal assembly is connected with the second plunger pump assembly, and the lower end of the seat seal assembly is connected with the upper end of the gas-liquid separator;
the seat seal assembly is used for sealing the bottom of an oil pipe of the shaft before the drainage operation, and the system is positioned in the oil pipe;
and the gas-liquid separator is used for separating the accumulated liquid in the shaft from the natural gas in the shaft after the first plunger pump assembly, the pneumatic pump assembly and the second plunger pump assembly are lowered into the oil pipe, and introducing the accumulated liquid into the oil pipe.
In another possible implementation, the seat assembly includes: the device comprises a central rod, a first central tube, a first slip seat, a first slip, a telescopic ring, a return spring, a slip ring, a second central tube, a second slip and a second slip seat;
The slip ring is sleeved with the telescopic ring, the upper end of the telescopic ring is connected with the lower end of the first central tube, the first slip seat is sleeved on the first central tube, and the first slip is arranged in the first slip seat;
the lower end of the slip ring is connected with the upper end of the second central tube, the lower end of the second central tube is connected with the gas-liquid separator, the second slip seat is sleeved on the second central tube, and the second slip is arranged in the second slip seat;
The slip ring is internally provided with the return spring, the lower end of the central rod is provided with a conical valve core, and the return spring is used for supporting the conical valve core;
The center rod is connected to the second plunger pump assembly when the water discharge operation is performed.
In another possible implementation, the first reversing valve assembly includes: a first reversing valve body and a first reversing valve core positioned in the first reversing valve body;
The second reversing valve assembly includes: the second reversing valve body and the second reversing valve core are positioned in the second reversing valve body;
The first reversing valve core is connected with the second reversing valve core;
the upper end of the first reversing valve body is connected with the first plunger pump assembly, and the lower end of the first reversing valve body is connected with the upper end of the pneumatic pump cylinder;
The upper end of the second reversing valve body is connected with the pneumatic pump cylinder, and the lower end of the second reversing valve body is connected with the second plunger pump assembly;
The first reversing valve body, the first reversing valve core, the second reversing valve body and the second reversing valve core are all provided with the first air inlet hole.
In another possible implementation manner, the first reversing valve body is further provided with a first exhaust hole, a first lateral air inlet hole, a first lateral exhaust hole and a communication hole;
The first lateral air inlet hole, the first lateral air outlet hole and the communication hole are all positioned in the first air inlet hole;
The communication hole is communicated with the first exhaust hole;
the first lateral air inlet and the first lateral air outlet are communicated with a first cylinder in the first reversing valve body.
In another possible implementation, the first plunger pump assembly includes: the device comprises an air inlet pipe, an air outlet pipe, a liquid outlet joint, a first pump cylinder, a first plunger, a first traveling valve component and a first fixed valve component;
The upper end of the first pump barrel is connected with the lower end of the liquid outlet connector, the upper end of the liquid outlet connector is connected with the air inlet pipe through a second air inlet hole on the liquid outlet connector, and the upper end of the liquid outlet connector is connected with the air outlet pipe through a second air outlet hole on the liquid outlet connector;
the lower end of the first pump cylinder is connected with the first reversing valve assembly through the first fixed valve assembly;
The first pump cylinder is internally provided with the first plunger and the first traveling valve assembly, the upper end of the first plunger is a free end, and the lower end of the first plunger is connected with the upper end of the first pneumatic piston connecting rod through the first traveling valve assembly.
In another possible implementation, the first traveling valve assembly includes: the first traveling valve body, the first traveling valve ball, the first traveling valve seat and the first traveling valve joint;
The upper end of the first traveling valve body is connected with the lower end of the first plunger, the lower end of the first traveling valve body is connected with the upper end of the first traveling valve connector, and the lower end of the first traveling valve connector is connected with the first pneumatic piston connecting rod;
The first traveling valve ball and the first traveling valve seat are arranged in the first traveling valve body, and the first traveling valve ball is propped against the first traveling valve seat.
In another possible implementation, the first stationary valve assembly includes: the first fixed valve, the first fixed valve body, the first fixed valve seat and the first fixed valve seat joint;
the first fixed valve sleeve is arranged on the first pneumatic piston connecting rod;
the upper end of the first fixed valve body is connected with the lower end of the first pump cylinder, and the lower end of the first fixed valve body is connected with the upper end of the first reversing valve assembly;
the first fixed valve seat is arranged in the first fixed valve body and is connected with the first fixed valve seat joint.
In another possible implementation manner, a third air inlet hole and a third air outlet hole are formed in the first pump cylinder;
When the upper end of the first pump cylinder is connected with the lower end of the liquid outlet connector, the second air inlet hole is aligned with the third air inlet hole, and the second air outlet hole is aligned with the third air outlet hole.
In another possible implementation, the second plunger pump assembly includes: the second pump barrel, the second plunger, the second traveling valve assembly and the second fixed valve assembly;
The upper end of the second pump barrel is connected with the second reversing valve assembly, and the lower end of the second pump barrel is connected with the second fixed valve assembly;
The second plunger and the second traveling valve assembly are arranged in the second pump barrel, the upper end of the second plunger is connected with the lower end of the second pneumatic piston connecting rod, and the lower end of the second plunger is connected with the second traveling valve assembly.
The technical scheme provided by the embodiment of the application has the beneficial effects that:
According to the plunger pump system provided by the embodiment of the application, the first reversing valve assembly and the second reversing valve assembly are respectively provided with the air inlet, natural gas in a shaft to be treated is introduced through the air inlet, and the pneumatic pump plunger in the pneumatic pump barrel is driven to reciprocate up and down by utilizing the pressure of the natural gas, so that the first plunger pump assembly and the second plunger pump assembly are driven to reciprocate up and down, and the water draining operation is carried out. Therefore, the application uses the pressure of the natural gas in the shaft as driving power when drainage operation is carried out, and expensive drainage equipment is not needed, thereby reducing the operation cost.
Drawings
FIG. 1 is a schematic diagram of a plunger pump system provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of another plunger pump system provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of another plunger pump system provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of another plunger pump system provided by an embodiment of the present application;
FIG. 5 is a schematic illustration of a seal assembly according to an embodiment of the present application;
FIG. 6 is a schematic illustration of another seat seal assembly according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a gas-liquid separator according to an embodiment of the present application;
FIG. 8 is a schematic view of a first reversing valve provided in an embodiment of the present application;
FIG. 9 is a schematic illustration of another first reversing valve provided in accordance with an embodiment of the present application;
FIG. 10 is a schematic illustration of a first reversing valve cartridge provided in an embodiment of the present application;
FIG. 11 is a schematic illustration of a second reversing valve provided in an embodiment of the present application;
FIG. 12 is a schematic illustration of a first plunger pump assembly according to an embodiment of the present application;
FIG. 13 is a schematic view of a liquid outlet connector according to an embodiment of the present application;
FIG. 14 is a schematic view of a first pump cartridge according to an embodiment of the present application;
FIG. 15 is a schematic illustration of a second plunger pump assembly provided in accordance with an embodiment of the present application;
Fig. 16 is a schematic view of another second plunger pump assembly provided in accordance with an embodiment of the present application.
Reference numerals denote: 1-first plunger pump assembly, 2-pneumatic pump assembly, 3-second plunger pump assembly, 4-seat seal assembly, 5-gas-liquid separator, 6-oil pipe, 11-air inlet pipe, 12-air outlet pipe, 13-liquid outlet joint, 14-first pump cylinder, 15-first plunger, 16-first traveling valve assembly, 17-first fixed valve assembly, 21-first reversing valve assembly, 22-pneumatic pump plunger, 23-pneumatic pump cylinder, 24-first pneumatic piston connecting rod, 25-second pneumatic piston connecting rod, 26-second reversing valve assembly, 31-second pump cylinder, 32-second plunger, 33-second traveling valve assembly, 34-second fixed valve assembly, 41-center rod, 42-first center tube, 43-first slip seat, 44-first slip, 45-telescoping ring, 46-return spring, 47-slip ring, 48-second center tube, 49-second slip, 50-second slip seat, 51-first slip retainer ring, 52-second slip retainer ring, 53-first packing element, 54-first packing element spacer, 55-second packing element, 56-second packing element spacer, 57-third packing element, 131-second inlet port, 132-second outlet port, 133-outlet port, 134-outlet joint coupling, 141-third inlet port, 142-third outlet port, 143-first pump cylinder, 161-first traveling valve body, 162-first traveling valve ball, 163-first traveling valve seat, 164-first traveling valve joint, 171-first stationary valve,
172-First stationary valve body, 173-first stationary valve seat, 174-first stationary valve seat fitting,
175-First stationary valve collar, 211-first reversing valve body, 212-first reversing valve cartridge,
231-Pneumatic pump cylinder coupling, 213-first reversing valve coupling, 261-second reversing valve body,
262-Second reversing valve core, 263-connecting pipe, 264-second reversing valve collar, 311-second pump cylinder collar,
331-A second traveling valve body, 332-a second traveling valve ball, 333-a second traveling valve seat,
334-Second traveling valve joint, 341-second stationary valve body, 342-second stationary valve ball,
343-Second stationary valve seat, 344-second stationary valve joint, 2111-first intake port,
2112-First exhaust holes, 2113-first lateral intake holes, 2114-first lateral exhaust holes,
2115-Communication holes, 2116-first limit grooves, 2117-first cylinders, 2121-top sealing surfaces,
2122-First seal annular space, 2123-first seal face, 2124-second seal face,
2125-Second seal annular space, 2126-third seal face, 2127-third seal annular space,
2128-Bottom sealing surface, 2129-reversing wrench, 2611-fourth vent, 2612-second limiting groove,
2613-Second lateral exhaust holes, 2614-second cylinders.
Detailed Description
In order to make the technical scheme and advantages of the present application more clear, the following further describes the embodiments of the present application in detail.
An embodiment of the present application provides a plunger pump system, referring to fig. 1,2, 3 and 4, including: a first plunger pump assembly 1, a pneumatic pump assembly 2 and a second plunger pump assembly 3;
The air pump assembly 2 includes: a first reversing valve assembly 21, an air pump plunger 22, an air pump cylinder 23, a first air piston rod 24, a second air piston rod 25, and a second reversing valve assembly 26;
The upper end of the pneumatic pump cylinder 23 is connected with the first plunger pump assembly 1 through the first reversing valve assembly 21, and the lower end of the pneumatic pump cylinder 23 is connected with the second plunger pump assembly 3 through the second reversing valve assembly 26;
The pneumatic pump cylinder 23 is internally provided with a pneumatic pump plunger 22, the upper end of the pneumatic pump plunger 22 is connected with the first plunger pump assembly 1 through a first pneumatic piston connecting rod 24, and the lower end of the pneumatic pump plunger 22 is connected with the second plunger pump assembly 3 through a second pneumatic piston connecting rod 25;
The first reversing valve assembly 21 and the second reversing valve assembly 26 are respectively provided with a first air inlet hole 2111 for introducing natural gas in a shaft to be treated, and the natural gas drives a pneumatic pump plunger 22 in a pneumatic pump cylinder 23 to reciprocate up and down so as to drive a first plunger pump assembly 1 and a second plunger pump assembly 3 to reciprocate up and down;
the first plunger pump assembly 1 and the second plunger pump assembly 3 are used for performing drainage operation in the up-and-down reciprocating process.
In the embodiment of the application, the connection mode between the two parts can be set and changed according to the needs. For example, the connection between the two parts is a threaded connection.
In one possible implementation, the upper end of the pump cylinder 23 of the pneumatic pump is in threaded connection with the lower end of the first reversing valve assembly 21, and the upper end of the first reversing valve assembly 21 is in threaded connection with the lower end of the first plunger pump assembly 1; the lower end of the pneumatic pump cylinder 23 is in threaded connection with the upper end of the second reversing valve assembly 26, and the lower end of the second reversing valve assembly 26 is in threaded connection with the upper end of the second plunger pump assembly 3.
Wherein, the upper end of the air pump cylinder 23 can be in threaded connection with the lower end of the first reversing valve assembly 21 through the first reversing valve coupling 213, and the lower end of the air pump cylinder 23 can be in threaded connection with the upper end of the second reversing valve assembly 26 through the air pump cylinder coupling 231.
The upper end of the pneumatic pump plunger 22 is in threaded connection with the lower end of the first pneumatic piston connecting rod 24, and the upper end of the first pneumatic piston connecting rod 24 is in threaded connection with the first plunger pump assembly 1; the lower end of the pneumatic pump plunger 22 is in threaded connection with the upper end of the second pneumatic piston connecting rod 25, and the lower end of the second pneumatic piston connecting rod 25 is in threaded connection with the second plunger pump assembly 3.
In one possible implementation, the thread direction may be set and modified as desired, e.g., the thread is left-handed or right-handed. For example, the lower end of the first reversing valve assembly 21 is screwed with the upper end of the first reversing valve collar 213, and the rotation direction is right; the lower end of the first reversing valve coupling 213 is connected with the upper end of the pneumatic pump cylinder 23 through threads, and the rotation direction is left; the lower end of the pneumatic pump cylinder 23 is connected with the upper end of the pneumatic pump cylinder coupling 231 through threads, and the screwing direction is left; the lower end of the pneumatic pump cylinder coupling 231 is connected with the upper end of the second reversing valve assembly 26 through threads, and the rotation direction is right.
According to the plunger pump system provided by the embodiment of the application, the first reversing valve assembly 21 and the second reversing valve assembly 26 are respectively provided with the air inlet holes, natural gas in a shaft to be treated is introduced through the air inlet holes, the pneumatic pump plunger 22 in the pneumatic pump cylinder 23 is driven to reciprocate up and down by utilizing the pressure of the natural gas, and the first plunger pump assembly 1 and the second plunger pump assembly 3 are driven to reciprocate up and down, so that water draining operation is performed. Therefore, the application uses the pressure of the natural gas in the shaft as driving power when drainage operation is carried out, and expensive drainage equipment is not needed, thereby reducing the operation cost.
Moreover, for natural gas fields with cool geographic positions and remote geographic positions, which require an industrial power supply to perform drainage operation, the system can also solve the problem that the field of the gas field is unpowered. In addition, if a gas engine is used as power in the field, not only a large amount of natural gas is consumed every day, but also a large amount of carbon dioxide is discharged into the environment by using the gas engine, so that the environment is polluted. The system provided by the application fully utilizes the pressure energy of natural gas as the power for lifting the accumulated liquid in the shaft, has no pollution to the environment, and follows the development strategy of low cost and sustainability and the long-term development concept.
In addition, in the related art, before drainage operation is performed through composite processes such as mechanical pumping, electric submersible pumps, foam drainage and the like, well killing operation needs to be performed on a gas well, so that blowout is avoided. In the related art, a well control fluid is injected into a gas well, but the well control fluid can enter the stratum along with gaps of the stratum to block the stratum, so that the yield of the gas well is reduced. Thus, after the drainage operation according to the method in the related art, the productivity of the gas well is greatly reduced and even risks losing productivity. Moreover, the well control operation in the related technology has high cost and complex technology, and does not accord with the development strategy of low cost and sustainable.
The plunger pump system provided by the embodiment of the application performs well-killing operation through the seat seal assembly 4 and the gas-liquid separator 5 by means of the steel wire operation vehicle, does not need to inject well-killing liquid, solves the production difficulty of injecting the well-killing liquid during site implementation, and reduces the risk of greatly reducing or even losing the productivity of a gas well after the well-killing operation of the gas well.
Correspondingly, the system further comprises: a seat seal assembly 4 and a gas-liquid separator 5;
the upper end of the seat seal assembly 4 is connected with the second plunger pump assembly 3, and the lower end of the seat seal assembly 4 is connected with the upper end of the gas-liquid separator 5;
a seat seal assembly 4 for sealing the bottom of the oil pipe 6 of the well bore before the drainage operation, the system being located in the oil pipe 6;
And the gas-liquid separator 5 is used for separating the accumulated liquid in the shaft from the natural gas in the shaft after the first plunger pump assembly 1, the pneumatic pump assembly 2 and the second plunger pump assembly 3 are put into the oil pipe 6, and introducing the accumulated liquid into the oil pipe 6.
When the well-killing operation is carried out, the lower end of the seat seal assembly 4 is firstly connected with the upper end of the gas-liquid separator 5 to form a whole, and the connection can be threaded connection. And then the seat seal assembly 4 and the gas-liquid separator 5 are put into the vicinity of the bottom port of the oil pipe 6 together by the steel wire working vehicle and the seat seal tool which is matched with the upper end size of the seat seal assembly 4, so that the gas-liquid separator 5 is completely arranged outside the oil pipe 6, and then the seat seal assembly 4 is seat sealed. After the seat sealing tool is sheared off with the shearing pin of the seat sealing assembly 4, the seat sealing tool is lifted out, and the seat sealing assembly 4 and the gas-liquid separator 5 are left in the well.
When the water drainage operation is carried out, the first plunger pump assembly 1, the pneumatic pump assembly 2 and the second plunger pump assembly 3 are put into the well, and the lower end of the second plunger pump assembly 3 is connected with the upper end of the seat seal assembly 4.
The connection manner of the seat assembly 4 and the gas-liquid separator 5 may be set and changed according to the needs, and in the embodiment of the present application, the connection manner is not specifically limited. For example, the connection may be a threaded connection.
Introduction of the seat seal assembly 4: in one possible implementation, referring to fig. 5 and 6, the seat assembly 4 comprises: a center rod 41, a first center tube 42, a first slip bowl 43, a first slip 44, a telescoping ring 45, a return spring 46, a slip ring 47, a second center tube 48, a second slip 49, and a second slip bowl 50;
The telescopic ring 45 is sleeved on the slip ring 47, the upper end of the telescopic ring 45 is connected with the lower end of the first central tube 42, the first central tube 42 is sleeved with the first slip seat 43, and the first slip seat 43 is internally provided with the first slip 44;
The lower end of the slip ring 47 is connected with the upper end of a second central tube 48, the lower end of the second central tube 48 is connected with the gas-liquid separator 5, a second slip seat 50 is sleeved on the second central tube 48, and a second slip 49 is arranged in the second slip seat 50;
A return spring 46 is arranged in the slip ring 47, a conical valve core is arranged at the lower end of the center rod 41, and the return spring 46 is used for supporting the conical valve core;
When the water discharge operation is performed, the upper end of the center rod 41 is connected to the second plunger pump assembly 3.
In this implementation, the first slip bowl 43 is sleeved on the upper portion of the first base pipe 42 and is capable of sliding along the first base pipe 42. The first slip bowl 43 is provided with a first slip 44 groove, and the first slip 44 is positioned in the first slip 44 groove. Wherein the number of first slips 44 is the same as the number of first slip 44 grooves, which may be set and modified as desired, e.g., the number of first slips 44 and first slip 44 grooves is 3 or 4. When the number of first slips 44 and first slip 44 grooves is 3, the 3 first slips 44 are circumferentially evenly distributed in the three first slip 44 grooves on the first slip bowl 43.
The second slip bowl 50 is sleeved on the lower portion of the second center tube 48 and can slide up and down along the second center tube 48. The second slip bowl 50 is provided with a second slip 49 groove, and the second slip 49 is positioned in the second slip 49 groove. Wherein the number of second slips 49 is the same as the number of second slip 49 grooves, which may be set and modified as desired, for example, when the number of second slips 49 and second slip 49 grooves is 3, the 3 second slips 49 are circumferentially uniformly distributed in the three second slip 49 grooves on the second slip bowl 50.
In one possible implementation, the seat seal assembly 4 further comprises: a first slip stop collar 51 and a second slip stop collar 52;
the first slip limiting ring 51 is used for limiting the first slips 44 and preventing the first slips 44 from being separated from corresponding slip grooves;
The second slip stop collar 52 is used to define the second slip 49 and prevent the second slip 49 from disengaging from its corresponding slip groove.
In one possible implementation, the slip ring 45 is sleeved on the slip ring 47, and the slip ring 47 can slide up and down within the slip ring 45. The return spring 46 is located in a groove in the slip ring 47 for supporting the conical spool at the lower end of the center rod 41.
In one possible implementation, the seat seal assembly 4 further comprises: a seal assembly; the seal assembly includes: the first packing element 53, the first packing element spacer 54, the second packing element 55, the second packing element spacer 56, and the third packing element 57.
The first packing element 53, the first packing element spacer 54, the second packing element 55, the second packing element spacer 56, and the third packing element 57 are sequentially sleeved on the upper portion of the second center tube 48.
When the well killing operation is carried out, the seat sealing tool is connected with the seat sealing assembly 4 through the shearing pin, the seat sealing assembly 4 is connected with the gas-liquid separator 5, then the seat sealing assembly 4 and the gas-liquid separator 5 are lowered into a gas well through the steel wire operation vehicle and the seat sealing tool, after the design depth is reached, the seat sealing assembly 4 is quickly lowered, the second slips 49 in the seat sealing assembly 4 move upwards under the action of friction force with the oil pipe 6, and a plurality of second slips 49 which are uniformly distributed in the circumferential direction are outwards supported and anchored on the inner wall of the oil pipe 6 under the action of the conical surface of the second central pipe 48. At this time, the parts above the slip ring 47 in the seat seal assembly 4 continue to move downwards under the gravity action of the seat seal tool, so that the sealing assembly consisting of the first sealing rubber cylinder 53, the first sealing rubber cylinder spacing ring 54, the second sealing rubber cylinder 55, the second sealing rubber cylinder spacing ring 56 and the third sealing rubber cylinder 57 at the lower part of the telescopic ring 45 is compressed and expanded, and the annular space between the oil pipe 6 and the seat seal assembly 4 is sealed. A plurality of first slips 44 uniformly distributed circumferentially fall under the action of gravity onto the conical surface of the central rod 41, and the slip teeth outside the first slips 44 are anchored to the inner wall of the oil pipe 6, thereby completing the setting process of the setting assembly 4 and the gas-liquid separator 5. Lifting the seat sealing tool, cutting off the shearing pin between the seat sealing tool and the seat sealing assembly 4, lifting out the seat sealing assembly 4, and completing releasing of the seat sealing assembly 4.
In the embodiment of the application, the seat seal assembly 4 mainly seals the bottom of the oil pipe 6, so that natural gas and water in a well cannot enter the upper part of the oil pipe 6, and the subsequent water draining operation is performed in the oil pipe 6 without pressure.
Introduction of the gas-liquid separator 5: in one possible implementation, referring to fig. 7, a plurality of bowl-shaped separation covers are welded on a central tube at the lower part of the gas-liquid separator 5, a plurality of liquid inlets are uniformly distributed on the central tube corresponding to the separation covers, when a gas-liquid mixture composed of natural gas and water passes through the gas-liquid separator 5, due to density difference between the water and the natural gas, the natural gas enters an oil jacket annular space along the outer part of the separation cover, the water enters the inner part of the separation cover, enters an oil pipe 6 through the liquid inlets on the central tube, and is discharged through the first plunger pump assembly 1, the pneumatic pump assembly 2 and the second plunger pump assembly 3.
In the embodiment of the application, the gas-liquid separator 5 has the main function of separating the accumulated liquid and the natural gas in the shaft, allowing the natural gas to reach the wellhead through the oil jacket annular space, and allowing the accumulated liquid to be discharged through the first plunger pump assembly 1, the pneumatic pump assembly 2 and the second plunger pump assembly 3, so that the gas production rate is increased.
In addition, in the embodiment of the application, in the gas well with serious hydrops, the purpose of lowering the seat seal assembly 4 and the gas-liquid separator 5 into the well is achieved by adopting low-cost steel wire operation instead of adopting a well control operation process with high cost and complex technology.
Introduction of the first and second reversing valve assemblies 21, 26: in one possible implementation, the first reversing valve assembly 21 includes: a first reversing valve body 211 and a first reversing valve core 212 located within the first reversing valve body 211;
The second reversing valve assembly 26 includes: a second reversing valve body 261 and a second reversing valve core 262 located within the second reversing valve body 261;
the first reversing valve spool 212 is connected to the second reversing valve spool 262;
the upper end of the first reversing valve body 211 is connected with the first plunger pump assembly 1, and the lower end of the first reversing valve body 211 is connected with the upper end of the pneumatic pump cylinder 23;
the upper end of the second reversing valve 261 is connected with the lower end of the pneumatic pump cylinder 23, and the lower end of the second reversing valve 261 is connected with the second plunger pump assembly 3;
The first reversing valve body 211, the first reversing valve core 212, the second reversing valve body 261 and the second reversing valve core 262 are provided with a first air inlet hole 2111.
In this implementation, the first reversing valve core 212 may slide up and down in the first reversing valve body 211, and the second reversing valve core 262 may also slide up and down in the second reversing valve body 261, and the first reversing valve core 212 and the second reversing valve core 262 are connected by a connecting pipe 263.
In this implementation, the first reversing valve body 211 may be connected to the upper end of the air pump cylinder 23 through the first reversing valve coupling 213, the upper end of the second reversing valve body 261 is connected to the lower end of the air pump cylinder 23 through the air pump cylinder coupling 231, and the lower end of the second reversing valve body 261 is connected to the second plunger pump assembly 3 through the second reversing valve coupling 264.
The upper end of the first reversing valve body 211 is in threaded connection with the first plunger pump assembly 1, and the rotation direction is left rotation; the lower end of the first reversing valve body 211 is in threaded connection with the upper end of the first reversing valve coupling 213, and the rotation direction is right; the upper end of the pneumatic pump cylinder 23 is in threaded connection with the lower end of the first reversing valve coupling 213, and the rotation direction is left; the lower end of the air pump barrel 23 is threaded with the upper end of the air pump barrel collar 231, the direction of rotation being left-handed, with continued reference to fig. 2. The upper end of the second reversing valve 261 is in threaded connection with the lower end of the pneumatic pump cylinder coupling 231, and the rotation direction is right; the lower end of the second reversing valve body 261 is in threaded connection with the upper end of the second reversing valve collar 264, and the rotation direction is left; the lower end of the second reversing valve collar 264 is threaded with the second plunger pump assembly 3, with the direction of rotation being right-handed, with continued reference to fig. 3.
In one possible implementation, referring to fig. 8 and 9, the first reversing valve body 211 is further provided with a first exhaust hole 2112, a first lateral intake hole 2113, a first lateral exhaust hole 2114, and a communication hole 2115;
The first lateral intake hole 2113, the first lateral exhaust hole 2114, and the communication hole 2115 are all located within the first intake hole 2111;
The communication hole 2115 communicates with the first exhaust hole 2112;
The first side intake ports 2113 and the first side exhaust ports 2114 are each in communication with a first cylinder 2117 in the first reversing valve body 211.
In one possible implementation, the first reversing valve body 211 is further provided with a first limiting groove 2116, and the first reversing valve core 212 is located in the first air inlet hole 2111 of the first reversing valve body 211, and the first limiting groove 2116 is used for limiting the position of the first reversing valve core 212.
In one possible implementation, referring to fig. 10, first reversing valve core 212 is configured with a top seal face 2121, a first seal annular space 2122, a first seal face 2123, a first intake port 2111, a second seal face 2124, a second seal annular space 2125, a third seal face 2126, a third seal annular space 2127, a bottom seal face 2128, and a reversing wrench 2129.
In one possible implementation, referring to fig. 11, the second reversing valve 261 is further provided with a vent hole, a limit groove, and a lateral vent hole. For convenience of distinction, the vent hole, the limit groove, and the lateral vent hole on the second reversing valve body 261 are referred to as a fourth vent hole 2611, a second limit groove 2612, and a second lateral vent hole 2613, respectively.
The second lateral exhaust hole 2613 is communicated with the fourth exhaust hole 2611, and the fourth exhaust hole 2611, the first air inlet hole 2111 and the second limit groove 2612 are communicated with a second cylinder 2614 of the second reversing valve body 261. Wherein the second limit groove 2612 is used to define the position of the second reversing valve spool 262.
In one possible implementation, the second reversing valve core 262 is similar in structure to the first reversing valve core 212, and a reversing wrench is also provided on the second reversing valve core 262, which is not specifically limited in the embodiment of the present application.
In one possible implementation, the pneumatic pump cylinder 23 is also provided with air intake and exhaust holes.
In the embodiment of the application, in the assembly process of the air pump assembly 2, the first reversing valve body 211, the air pump cylinder 23 and the second reversing valve body 261 are connected together through the first reversing valve coupling 213 and the air pump cylinder coupling 231, the upper end of the first reversing valve coupling 213 and the upper end of the air pump cylinder coupling 231 are all left-handed threads, and the lower end of the first reversing valve coupling 213 and the lower end of the air pump cylinder coupling 231 are all right-handed threads, so that the air inlet holes and the air outlet holes on the first reversing valve body 211, the air pump cylinder 23 and the second reversing valve body 261 are aligned in the connection process.
In the embodiment of the application, the main function of the pneumatic pump plunger 22 and the pneumatic pump cylinder 23 is to utilize high-pressure natural gas in the well or an adjacent well as a power source, and the first reversing valve assembly 21 and the second reversing valve assembly 26 are utilized to realize the up-and-down reciprocating motion of the pneumatic pump plunger 22, and the first pneumatic piston connecting rod 24 and the second pneumatic piston connecting rod 25 drive the first plunger pump assembly 1 and the second plunger pump assembly 3 to reciprocate up and down, so that the purpose of discharging the accumulated liquid in the shaft to the ground is achieved.
Introduction to first plunger pump assembly 1: in one possible implementation, referring to fig. 4 and 12, the first plunger pump assembly 1 includes: the air inlet pipe 11, the air outlet pipe 12, the liquid outlet joint 13, the first pump cylinder 14, the first plunger 15, the first traveling valve assembly 16 and the first fixed valve assembly 17;
The upper end of the first pump cylinder 14 is connected with the lower end of the liquid outlet connector 13, the upper end of the liquid outlet connector 13 is connected with the air inlet pipe 11 through a second air inlet hole 131 on the liquid outlet connector 13, and is connected with the air outlet pipe 12 through a second air outlet hole 132 on the liquid outlet connector 13;
The lower end of the first pump cylinder 14 is connected with a first reversing valve assembly 21 through a first fixed valve assembly 17;
the first pump cylinder 14 is internally provided with a first plunger 15 and a first traveling valve assembly 16, the upper end of the first plunger 15 is a free end, and the lower end of the first plunger 15 is connected with the upper end of the first pneumatic piston connecting rod 24 through the first traveling valve assembly 16.
In this implementation manner, the upper end of the liquid outlet connector 13 is provided with two screw holes distributed in the circumferential direction, namely a second air inlet hole 131 and a second air outlet hole 132, the side surface is provided with a liquid outlet hole 133, the air inlet pipe 11 is connected with the second air inlet hole 131, and the air outlet pipe 12 is connected with the second air outlet hole 132, see fig. 13.
The upper end of the first pump cylinder 14 is connected with the lower end of the liquid outlet joint 13 through a liquid outlet joint coupling 134, and the lower end of the first pump cylinder 14 is connected with the upper end of the first fixed valve assembly 17 through a first pump cylinder coupling 143; the upper end of the first pump cylinder 14 is in threaded connection with the lower end of the liquid outlet joint coupling 134, and the rotation direction is right; the lower end of the first pump cylinder 14 is connected with the upper end of the first pump cylinder coupling 143, and the rotation direction is right; the lower end of the first pump cylinder coupling 143 is connected to the first stationary valve assembly 17 with a left hand rotation.
Referring to fig. 14, the first pump cylinder 14 is provided with a third air inlet hole 141 and a third air outlet hole 142, and when the liquid outlet connector 13 is connected to the upper end of the first pump cylinder 14 through the liquid outlet connector coupling 134, the second air inlet hole 131 is aligned with the third air inlet hole 141, and the second air outlet hole 132 is aligned with the third air outlet hole 142.
Introduction of the first stationary valve assembly 17: in one possible implementation, the first stationary valve assembly 17 comprises: a first stationary valve 171, a first stationary valve body 172, a first stationary valve seat 173, and a first stationary valve seat joint 174;
the first fixed valve 171 is sleeved on the first pneumatic piston connecting rod 24;
The upper end of the first fixed valve body 172 is connected with the lower end of the first pump cylinder 14, and the lower end of the first fixed valve body 172 is connected with the upper end of the first reversing valve assembly 21;
A first fixed valve seat 173 is provided in the first fixed valve body 172, and the first fixed valve seat 173 is connected to a first fixed valve seat joint 174.
In this implementation, the upper end of the first stationary valve body 172 is connected to the lower end of the first pump cylinder 14 by a first pump cylinder coupling 143, and the lower end of the first stationary valve body 172 is connected to the upper end of the first reversing valve assembly 21 by a first stationary valve coupling 175. Specifically, the upper end of the first fixed valve body 172 is screwed with the lower end of the first pump barrel coupling 143, and the rotation direction is left rotation; the lower end of the first fixed valve body 172 is in threaded connection with the upper end of the first fixed valve collar 175, and the screwing direction is right; the lower end of the first fixed valve collar 175 is screwed with the upper end of the first reversing valve body 211, and the screwing direction is left-handed.
In one possible implementation, the shape of the first fixed valve 171 may be set and changed as needed, which is not particularly limited in the embodiment of the present application. For example, the first fixed valve 171 may be a conical valve.
Introduction of the first traveling valve assembly 16: in one possible implementation, the first traveling valve assembly 16 includes: a first traveling valve body 161, a first traveling valve ball 162, a first traveling valve seat 163, and a first traveling valve joint 164;
the upper end of the first traveling valve body 161 is connected with the lower end of the first plunger 15, the lower end of the first traveling valve body 161 is connected with the upper end of the first traveling valve joint 164, and the lower end of the first traveling valve joint 164 is connected with the first pneumatic piston connecting rod 24;
The first traveling valve body 161 is provided with a first traveling valve ball 162 and a first traveling valve seat 163 therein, and the first traveling valve ball 162 abuts against the first traveling valve seat 163.
In this implementation manner, the upper end of the first traveling valve body 161 is in threaded connection with the lower end of the first plunger 15, and the upper end of the first plunger 15 is a free end; the lower end of the first traveling valve body 161 is screwed to the upper end of the first traveling valve joint 164, and the lower end of the first traveling valve joint 164 is screwed to the upper end of the first air piston link 24.
In the embodiment of the application, when the first plunger 15 and the first traveling valve assembly 16 are on, the accumulated liquid in the shaft enters the pump cavity through the first fixed valve assembly 17, so as to complete the liquid feeding process of the first plunger pump assembly 1. The liquid outlet connector coupling 134 and the first stationary valve coupling 175 connect the liquid outlet connector 13 and the first stationary valve assembly 17 as a unit.
Introduction to the second plunger pump assembly 3: in one possible implementation, referring to fig. 15 and 16, the second plunger pump assembly 3 includes: a second pump barrel 31, a second plunger 32, a second traveling valve assembly 33, and a second stationary valve assembly 34;
The upper end of the second pump cylinder 31 is connected with the second reversing valve assembly 26, and the lower end of the second pump cylinder 31 is connected with the second fixed valve assembly 34;
A second plunger 32 and a second traveling valve assembly 33 are disposed in the second pump barrel 31, the upper end of the second plunger 32 is connected to the lower end of the second pneumatic piston rod 25, and the lower end of the second plunger 32 is connected to the second traveling valve assembly 33.
In this implementation, the lower end of the second pump barrel 31 may be connected to the second stationary valve assembly 34 through a second pump barrel coupling 311. Specifically, the lower end of the second pump cylinder 31 is screw-coupled with the upper end of the second pump cylinder coupling 311, and the lower end of the second pump cylinder coupling 311 is screw-coupled with the second stationary valve assembly 34.
Introduction to the second stationary valve assembly 34: in one possible implementation, the second stationary valve assembly 34 includes: a second fixed valve body 341, a second fixed valve ball 342, a second fixed valve seat 343, and a second fixed valve joint 344.
In this implementation, the upper end of the second fixed valve body 341 may be connected to the second pump barrel 31 through the second pump barrel coupling 311, specifically, the upper end of the second fixed valve body 341 is screw-connected to the lower end of the second pump barrel coupling 311, and the upper end of the second pump barrel coupling 311 is screw-connected to the lower end of the second pump barrel 31.
The second fixed valve body 341 is provided with the second fixed valve ball 342 and the second fixed valve seat 343, the second fixed valve ball 342 is abutted against the second fixed valve seat 343, and the second fixed valve seat 343 is connected with the second fixed valve joint 344. The second fixed valve fitting 344 is connected to the central rod 41 in the seat assembly 4 when the drain operation is performed.
The connection manner of each part in the second fixed valve assembly 34 is similar to that of each part in the first fixed valve assembly 17, and will not be described herein.
Introduction of the second traveling valve assembly 33: in one possible implementation, the second traveling valve assembly 33 includes: a second traveling valve body 331, a second traveling valve ball 332, a second traveling valve seat 333, and a second traveling valve joint 334;
The upper end of the second traveling valve body 331 is connected with the lower end of the second plunger 32, and the lower end of the second traveling valve body 331 is connected with the upper end of the second traveling valve joint 334;
A second traveling valve ball 332 and a second traveling valve seat 333 are provided in the second traveling valve body 331, and the second traveling valve ball 332 abuts against the first traveling valve seat 163.
In this implementation manner, the upper end of the second traveling valve body 331 is in threaded connection with the lower end of the second plunger 32, and the upper end of the second plunger 32 is a free end; the lower end of the second traveling valve body 331 is screw-coupled to the upper end of the second traveling valve joint 334.
The dimensions of the parts in the system may be set and modified as required, and in the embodiment of the present application, the dimensions are not specifically limited. For example, the maximum outer diameter of the parts in the system does not exceed 58mm.
In the embodiment of the application, after the well killing operation is completed, the valve of the oil pipe 6 is slowly opened, and the pressure in the oil pipe 6 is relieved. When the pressure of the oil pipe 6 is zero, it indicates that the seat seal assembly 4 has blocked the entry of natural gas and water in the stratum, at this time, the gas production tree above the large four-way joint can be removed, and the whole body of the first plunger pump assembly 1, the pneumatic pump assembly 2 and the second plunger pump assembly 3 is lowered into the shaft until the second fixed valve joint 344 at the lower end of the second plunger pump assembly 3 is in butt joint with the central rod 41 at the upper end of the seat seal assembly 4. At this time, under the action of gravity, the end face in the fixed valve joint in the second plunger 32 assembly presses down the central pipe, so that the first fixed valve 171 on the central rod 41 is opened, and the accumulated liquid in the shaft enters the oil pipe 6 through the first fixed valve 171 and the liquid inlet hole on the gas-liquid separator 5.
High-pressure natural gas in the sleeve is introduced into the air inlet pipe 11 through the control valve group, the high-pressure natural gas enters the air inlet pipe 11 into the air pump assembly 2, when the first reversing valve core 212 and the second reversing valve core 262 in the air pump assembly 2 are both positioned at the upper part, the high-pressure natural gas firstly enters the air pump cylinder 23 through the air inlet hole on the first reversing valve core 212 and the air inlet hole on the first reversing valve body 211, the high-pressure natural gas pushes the air pump plunger 22 in the air pump cylinder 23 to descend, and at the moment, the air outlet holes on the second reversing valve body 261 and the second reversing valve core 262 are aligned. The pneumatic pump plunger 22 drives the first plunger 15 and the first traveling valve assembly 16 of the first plunger pump assembly 1 to move downwards through the first pneumatic piston connecting rod 24, and at this time, the first traveling valve ball 162 in the first traveling valve assembly 16 is opened and is in a liquid draining state. The second traveling valve ball 332 in the second plunger pump assembly 3 is in an open state, and the liquid in the pump cylinder of the second plunger 32 enters the oil pipe 6 through the middle pore canal of the second pneumatic piston connecting rod 25, the middle pore canal of the pneumatic pump plunger 22, the middle pore canal of the first pneumatic piston connecting rod 24 and the first traveling valve assembly 16, and the gas at the lower part of the pneumatic pump plunger 22 enters the exhaust pipe 12 through the second reversing valve body 261 and the exhaust hole on the second reversing valve core 262.
When the air pump plunger 22 moves to the bottom dead center, the lower end surface of the air pump plunger 22 pushes the reversing wrench 2130 on the second reversing valve core 262 to move downwards, so that the exhaust hole on the second reversing valve body 261 is closed, and the first air inlet hole 2111 on the second reversing valve body 261 is opened. The second reversing valve core 262 drives the first reversing valve core 212 to descend through the connecting pipe 263, a first air inlet hole 2111 on the first reversing valve body 211 is closed, a first air outlet hole 2112 on the first reversing valve body 211 is opened, at the moment, the pneumatic pump plunger 22 moves upwards, the second plunger pump assembly 3 and the first plunger pump assembly 1 are driven to ascend, and the second plunger pump assembly 3 and the first plunger pump assembly 1 are both in a liquid inlet state. Through continuous reciprocating motion, the first plunger pump assembly 1 and the second plunger pump assembly 3 continuously discharge accumulated liquid in the shaft to the ground, so that the purpose of liquid discharge and gas production is achieved.
The plunger pump system provided by the embodiment of the application fully utilizes the pressure energy of high-pressure natural gas in a shaft as the power of drainage operation, the pneumatic pump assembly 2, the first plunger pump assembly 1 and the second plunger pump assembly 3 are put into the shaft, the pneumatic pump assembly 2 is driven by the high-pressure natural gas, and the pneumatic pump assembly 2 drives the first plunger pump assembly 1 and the second plunger pump assembly 3 to reciprocate up and down, so that accumulated liquid in the shaft is discharged to the ground.
The foregoing description is only for the convenience of those skilled in the art to understand the technical solution of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A plunger pump system, the system comprising: a first plunger pump assembly, a pneumatic pump assembly, and a second plunger pump assembly;
The pneumatic pump assembly includes: the device comprises a first reversing valve assembly, a pneumatic pump plunger, a pneumatic pump barrel, a first pneumatic piston connecting rod, a second pneumatic piston connecting rod and a second reversing valve assembly;
The upper end of the pneumatic pump cylinder is connected with the first plunger pump assembly through the first reversing valve assembly, and the lower end of the pneumatic pump cylinder is connected with the second plunger pump assembly through the second reversing valve assembly;
The pneumatic pump cylinder is internally provided with the pneumatic pump plunger, the upper end of the pneumatic pump plunger is connected with the first plunger pump assembly through the first pneumatic piston connecting rod, and the lower end of the pneumatic pump plunger is connected with the second plunger pump assembly through the second pneumatic piston connecting rod;
The first reversing valve assembly and the second reversing valve assembly are respectively provided with a first air inlet hole for introducing natural gas in a shaft to be treated, and the pneumatic pump plunger is driven by the natural gas to reciprocate up and down so as to drive the first plunger pump assembly and the second plunger pump assembly to reciprocate up and down;
The first plunger pump assembly and the second plunger pump assembly are used for conducting drainage operation in the up-and-down reciprocating motion process.
2. The system of claim 1, wherein the system further comprises: a seat seal assembly and a gas-liquid separator;
the upper end of the seat seal assembly is connected with the second plunger pump assembly, and the lower end of the seat seal assembly is connected with the upper end of the gas-liquid separator;
the seat seal assembly is used for sealing the bottom of an oil pipe of the shaft before the drainage operation, and the system is positioned in the oil pipe;
and the gas-liquid separator is used for separating the accumulated liquid in the shaft from the natural gas in the shaft after the first plunger pump assembly, the pneumatic pump assembly and the second plunger pump assembly are lowered into the oil pipe, and introducing the accumulated liquid into the oil pipe.
3. The system of claim 2, wherein the seat assembly comprises: the device comprises a central rod, a first central tube, a first slip seat, a first slip, a telescopic ring, a return spring, a slip ring, a second central tube, a second slip and a second slip seat;
The slip ring is sleeved with the telescopic ring, the upper end of the telescopic ring is connected with the lower end of the first central tube, the first slip seat is sleeved on the first central tube, and the first slip is arranged in the first slip seat;
the lower end of the slip ring is connected with the upper end of the second central tube, the lower end of the second central tube is connected with the gas-liquid separator, the second slip seat is sleeved on the second central tube, and the second slip is arranged in the second slip seat;
The slip ring is internally provided with the return spring, the lower end of the central rod is provided with a conical valve core, and the return spring is used for supporting the conical valve core;
The center rod is connected to the second plunger pump assembly when the water discharge operation is performed.
4. The system of claim 1, wherein the first reversing valve assembly comprises: a first reversing valve body and a first reversing valve core positioned in the first reversing valve body;
The second reversing valve assembly includes: the second reversing valve body and the second reversing valve core are positioned in the second reversing valve body;
The first reversing valve core is connected with the second reversing valve core;
the upper end of the first reversing valve body is connected with the first plunger pump assembly, and the lower end of the first reversing valve body is connected with the upper end of the pneumatic pump cylinder;
The upper end of the second reversing valve body is connected with the pneumatic pump cylinder, and the lower end of the second reversing valve body is connected with the second plunger pump assembly;
The first reversing valve body, the first reversing valve core, the second reversing valve body and the second reversing valve core are all provided with the first air inlet hole.
5. The system of claim 4, wherein the first reversing valve body is further provided with a first exhaust hole, a first lateral air inlet hole, a first lateral air outlet hole and a communication hole;
The first lateral air inlet hole, the first lateral air outlet hole and the communication hole are all positioned in the first air inlet hole;
The communication hole is communicated with the first exhaust hole;
the first lateral air inlet and the first lateral air outlet are communicated with a first cylinder in the first reversing valve body.
6. The system of claim 1, wherein the first plunger pump assembly comprises: the device comprises an air inlet pipe, an air outlet pipe, a liquid outlet joint, a first pump cylinder, a first plunger, a first traveling valve component and a first fixed valve component;
The upper end of the first pump barrel is connected with the lower end of the liquid outlet connector, the upper end of the liquid outlet connector is connected with the air inlet pipe through a second air inlet hole on the liquid outlet connector, and the upper end of the liquid outlet connector is connected with the air outlet pipe through a second air outlet hole on the liquid outlet connector;
the lower end of the first pump cylinder is connected with the first reversing valve assembly through the first fixed valve assembly;
The first pump cylinder is internally provided with the first plunger and the first traveling valve assembly, the upper end of the first plunger is a free end, and the lower end of the first plunger is connected with the upper end of the first pneumatic piston connecting rod through the first traveling valve assembly.
7. The system of claim 6, wherein the first traveling valve assembly comprises: the first traveling valve body, the first traveling valve ball, the first traveling valve seat and the first traveling valve joint;
The upper end of the first traveling valve body is connected with the lower end of the first plunger, the lower end of the first traveling valve body is connected with the upper end of the first traveling valve connector, and the lower end of the first traveling valve connector is connected with the first pneumatic piston connecting rod;
The first traveling valve ball and the first traveling valve seat are arranged in the first traveling valve body, and the first traveling valve ball is propped against the first traveling valve seat.
8. The system of claim 6, wherein the first stationary valve assembly comprises: the first fixed valve, the first fixed valve body, the first fixed valve seat and the first fixed valve seat joint;
the first fixed valve sleeve is arranged on the first pneumatic piston connecting rod;
the upper end of the first fixed valve body is connected with the lower end of the first pump cylinder, and the lower end of the first fixed valve body is connected with the upper end of the first reversing valve assembly;
the first fixed valve seat is arranged in the first fixed valve body and is connected with the first fixed valve seat joint.
9. The system of claim 6, wherein the first pump cylinder is provided with a third air inlet and a third air outlet;
When the upper end of the first pump cylinder is connected with the lower end of the liquid outlet connector, the second air inlet hole is aligned with the third air inlet hole, and the second air outlet hole is aligned with the third air outlet hole.
10. The system of claim 1, wherein the second plunger pump assembly comprises: the second pump barrel, the second plunger, the second traveling valve assembly and the second fixed valve assembly;
The upper end of the second pump barrel is connected with the second reversing valve assembly, and the lower end of the second pump barrel is connected with the second fixed valve assembly;
The second plunger and the second traveling valve assembly are arranged in the second pump barrel, the upper end of the second plunger is connected with the lower end of the second pneumatic piston connecting rod, and the lower end of the second plunger is connected with the second traveling valve assembly.
CN202011262562.5A 2020-11-12 2020-11-12 Piston pump system Active CN114483551B (en)

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CN116988768B (en) * 2023-09-12 2025-10-03 新疆克拉玛依市采丰实业有限责任公司 A tube-rod oil pump and an oil pumping system having the same
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