Plunger pump oil extraction device

Abstract

The invention relates to an oil extraction device, and discloses a plunger pump oil extraction device. The plunger pump oil extraction device comprises a driving mechanism (1), an oil well pump barrel (4), an oil well pump plunger (3) inserted in the oil well pump barrel (4) and a driving connecting assembly (2) connected between the oil well pump plunger (3) and the driving mechanism (1). The driving connecting assembly (2) can convert the rotating motion of the driving mechanism (1) into linear push-pull motion of the oil well pump plunger (3) in the oil well pump cylinder (4). The plunger pump oil extraction device can greatly reduce oil extraction energy consumption, reduce labor cost and promote green development of an oil field, and has wide application prospects and remarkable social benefits.

Description

Technical Field

[0001] The present invention relates to an oil production device, and specifically, to a plunger pump oil production device. Background Art

[0002] As the oilfield development enters the middle and late stages, the number of low-yield wells and highly deviated wells gradually increases. To solve problems such as eccentric wear of the rod and pipe in the wellbore, low system efficiency, and large volume of surface equipment, each oilfield has successively promoted the application of rodless pump products. In recent years, products such as electric submersible direct drive plunger pumps, electric submersible direct drive screw pumps, and wide-range electric pumps have been successively developed and have been applied in a certain number in the oilfield field. However, they all show their respective inadaptabilities to problems such as low liquid production volume in the oilfield, deep pump setting depth, and certain corrosion of well fluids. The wide-range electric pump cannot adapt to small-displacement lifting, has insufficient adaptability to sand production, gas-containing, and scaling well conditions, and is prone to pump blockage or gas locking due to downhole scaling, wax deposition, and high gas-oil ratio, etc., thus forming a failure and causing pump inspection; the rubber compatibility of the electric submersible direct drive screw pump relies on foreign imports, is limited in temperature resistance, and requires frequent pump inspections; the electric submersible direct drive plunger pump operates by a large current impact, and cannot fundamentally solve the problems of limited lifting force and vibration. The linear motor is not yet mature in downhole use, has poor stability, small power, low efficiency, and a short normal working cycle. Summary of the Invention

[0003] The object of the present invention is to provide a plunger pump oil production device, which can greatly reduce the energy consumption of oil production, reduce labor costs, boost the green development of the oilfield, and has broad application prospects and significant social benefits.

[0004] To achieve the above object, the present invention provides a plunger pump oil production device, including a driving mechanism, a sucker rod pump barrel, a sucker rod pump plunger inserted in the sucker rod pump barrel, and a driving connection assembly connected between the sucker rod pump plunger and the driving mechanism. The driving connection assembly can convert the rotational motion of the driving mechanism into a linear push-pull motion of the sucker rod pump plunger in the sucker rod pump barrel.

[0005] Optionally, the driving connection assembly includes a lead screw shaft and a sliding sleeve. The sliding sleeve is sleeved on the lead screw shaft and is threadedly connected to the lead screw shaft. One end of the sliding sleeve is connected to the sucker rod pump barrel, one end of the lead screw shaft is connected to the sucker rod pump plunger, and the other end is connected to the driving mechanism, so as to enable the sliding sleeve to move along the axial direction of the lead screw shaft during the process of the driving mechanism driving the lead screw shaft to rotate, and realize the linear push-pull motion of the sucker rod pump plunger in the sucker rod pump barrel through the movement of the sliding sleeve.

[0006] Optionally, the driving connection assembly further includes an outer cylinder sleeved on the lead screw shaft and a first buffer member connected between the outer cylinder and the sliding sleeve.

[0007] Optionally, the first buffer is a spring.

[0008] Optionally, a limiting structure is provided between the outer cylinder and the lead screw shaft for limiting the axial displacement of the sliding sleeve on the lead screw shaft.

[0009] Optionally, the limiting structure includes a first limiting boss, a second limiting boss, a first limiting member and a second limiting member. The first limiting boss and the second limiting boss are arranged on the outer cylinder along the axial direction of the outer cylinder. The first limiting member and the second limiting member are connected to the lead screw shaft along the axial direction of the lead screw shaft. The first limiting member and the second limiting member are arranged between the first limiting boss and the second limiting boss, and the first limiting member can abut against the first limiting boss, and the second limiting member can abut against the second limiting boss.

[0010] Optionally, the first limiting member and the second limiting member are tapered bearings.

[0011] Optionally, the drive connection assembly further includes a guiding structure connected to the lead screw shaft. The guiding structure is adapted to be inserted into the pump barrel of the oil pump and can cooperate with the pump barrel of the oil pump to realize axial guiding.

[0012] Optionally, the guiding structure includes guiding limiting ribs connected to the lead screw shaft and a guiding positioning collar sleeved on the guiding limiting ribs. The guiding limiting ribs are in contact with the inner wall surface of the pump barrel of the oil pump.

[0013] Optionally, a second buffer is provided between the guiding positioning collar and the sliding sleeve.

[0014] Optionally, the second buffer is a spring.

[0015] Optionally, the plunger of the oil pump includes a plunger connecting rod and a plunger traveling valve arranged on the plunger connecting rod.

[0016] Optionally, there are two plunger traveling valves, namely a first plunger traveling valve and a second plunger traveling valve, which are arranged along the axial direction of the plunger connecting rod.

[0017] Optionally, the pump barrel of the sucker rod pump includes an inner barrel of the pump barrel, a two-way structure of the pump barrel connected to one end of the inner barrel of the pump barrel, and an outer barrel of the pump barrel sleeved on the inner barrel of the pump barrel. A first liquid flow channel is formed inside the inner barrel of the pump barrel, and a second liquid flow channel is formed between the inner barrel of the pump barrel and the outer barrel of the pump barrel. The first liquid flow channel and the second liquid flow channel are connected. The liquid is adapted to enter the first liquid flow channel from the two-way structure of the pump barrel, then enter the second liquid flow channel, and flow to the outside of the pump barrel of the sucker rod pump through the two-way structure of the pump barrel.

[0018] Optionally, a support structure is provided on the outer barrel of the pump barrel, and the inner barrel of the pump barrel can be erected on the support structure.

[0019] Optionally, an inlet check valve is further provided inside the inner barrel of the pump barrel.

[0020] Optionally, there are two groups of the inlet check valves, namely a first check valve and a second check valve, and the first check valve and the second check valve are arranged along the axial direction of the inner barrel of the pump barrel.

[0021] Optionally, a first channel and a second channel are provided inside the two-way structure of the pump barrel. The inlet of the first channel is connected to the inlet of the pump barrel of the sucker rod pump, and the outlet is connected to the first liquid flow channel; the inlet of the second channel is connected to the second liquid flow channel, and the outlet is connected to the outlet of the pump barrel of the sucker rod pump.

[0022] Optionally, a pump barrel sealing structure is provided between the pump barrel of the sucker rod pump and the plunger of the sucker rod pump.

[0023] Optionally, an outlet check valve is further included, and the outlet check valve is arranged at the outlet of the pump barrel of the sucker rod pump.

[0024] Through the above technical solutions, the plunger pump oil production device provided by the present invention connects the driving connection component between the plunger of the sucker rod pump and the driving mechanism, and can convert the rotational motion of the driving mechanism into the linear push-pull motion of the plunger of the sucker rod pump in the pump barrel of the sucker rod pump through the driving connection component, so as to achieve the purpose of driving the plunger of the sucker rod pump to move in the pump barrel of the sucker rod pump through the driving mechanism, reduce the huge intermediate transmission link of the pumping unit, reduce the lifting energy consumption, and significantly improve the oilfield lifting efficiency. Moreover, the driving connection component can realize the linear push-pull motion of the plunger of the sucker rod pump in the pump barrel of the sucker rod pump, reduce the wear caused by the plunger offset, extend the pump inspection period, and reduce the workover operation cost. It can also realize intelligent oil production by only controlling the driving mechanism, meet the technical requirements of intelligent regulation of oil wells, and meet the requirements of the green and low-carbon development of oilfields. The plunger pump oil production device provided by the present invention can greatly reduce the oil production energy consumption and labor cost, boost the green development of oilfields, and has broad application prospects and remarkable social benefits.

[0025] In a preferred embodiment, the first buffer member and the second buffer member can provide soft support for the movement of the sliding sleeve in the axial direction of the lead screw shaft, avoiding hard impacts between the sliding sleeve and other components when the sliding sleeve moves in the axial direction of the lead screw shaft, thereby avoiding current impact on the driving mechanism. Moreover, it can buffer the driving mechanism's pushing of the plunger of the oil extraction pump out of the pump barrel of the oil extraction pump, reducing the impact force on the pump barrel of the oil extraction pump.

[0026] In a preferred embodiment, the guiding and limiting ribs and the guiding and positioning collar play a role in radially (circumferentially) limiting the sliding sleeve, preventing the sliding sleeve from rotating along with the rotation of the lead screw shaft, and forcing the sliding sleeve to move reciprocally in the circumferential direction of the lead screw shaft.

[0027] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 is a schematic structural diagram of a specific embodiment of the plunger pump oil production device in the present invention;

[0030] Figure 2 is a schematic structural diagram of a specific embodiment of the driving connection assembly in the present invention;

[0031] Figure 3 is a schematic structural diagram of a specific embodiment of the plunger of the oil extraction pump in the present invention;

[0032] Figure 4 is a schematic structural diagram of a specific embodiment of the pump barrel of the oil extraction pump in the present invention;

[0033] Figure 5 is a schematic structural diagram of a specific embodiment of the two-way structure of the pump barrel in the present invention.

[0034] DESCRIPTION OF THE REFERENCE NUMERALS

[0035] 1 Driving mechanism 2 Driving connection assembly

[0036] 3 Plunger of the oil extraction pump 4 Pump barrel of the oil extraction pump

[0037] 5 Outlet check valve

[0038] 21 First connecting member 22 Lead screw shaft

[0039] 23 First limiting member 24 Second limiting member

[0040] 25 First buffer member 26 Slip sleeve

[0041] 27 Guide limiting rib 28 Second buffer member

[0042] 29 Guide positioning collar 210 Second connecting member

[0043] 211 Outer cylinder 212 First limiting boss

[0044] 213 Second limiting boss

[0045] 31 Plunger connecting rod 32 First plunger floating valve

[0046] 33 Second plunger floating valve

[0047] 41 Pump barrel sealing structure 42 Inner barrel of pump barrel

[0048] 43 Outer barrel of pump barrel 44 First check valve

[0049] 45 Second check valve 46 Two-way structure of pump barrel

[0050] 461 First channel 462 Second channel Detailed implementation manners

[0051] The following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for the purpose of illustration and explanation of the present invention, and are not used to limit the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, it may be an abutting connection, or the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features.

[0054] In a basic implementation manner of the present invention, refer to Figure 1, the plunger pump oil production device includes a driving mechanism 1, a sucker rod pump barrel 4, a sucker rod pump plunger 3 inserted into the sucker rod pump barrel 4, and a driving connection assembly 2 connected between the sucker rod pump plunger 3 and the driving mechanism 1. The driving connection assembly 2 can convert the rotational motion of the driving mechanism 1 into the linear push-pull motion of the sucker rod pump plunger 3 in the sucker rod pump barrel 4.

[0055] According to the present invention, the driving mechanism 1 can be a driving motor or any other mechanism capable of driving an external structure to perform rotational motion. The model of the driving motor can be determined by those skilled in the art according to the actual situation. As a specific embodiment of the present invention, the driving mechanism 1 is a low-speed rotating motor, which is a commonly used device in the petroleum industry and is common with the motors used in conventional submersible screw pumps.

[0056] The linear push-pull motion of the sucker rod pump plunger 3 in the sucker rod pump barrel 4 means that the sucker rod pump plunger 3 reciprocates along the axial direction a of the sucker rod pump barrel 4 in the sucker rod pump barrel 4.

[0057] When the plunger pump oil production device provided by the above basic embodiment of the present invention works, the sucker rod pump barrel 4 is placed in the oil, and then it is started through the driving mechanism 1. The driving connection assembly 2 converts the rotational motion of the driving mechanism 1 into the linear push-pull motion of the sucker rod pump plunger 3 in the sucker rod pump barrel 4, realizing the oil production and oil discharge of the plunger pump oil production device. When the sucker rod pump plunger 3 is pulled backward in the sucker rod pump barrel 4, a negative pressure is formed in the sucker rod pump barrel 4, and the oil enters the inside of the sucker rod pump barrel 4. When the sucker rod pump plunger 3 is pushed forward in the sucker rod pump barrel 4, a positive pressure is formed in the sucker rod pump barrel 4, and the oil is discharged from the sucker rod pump barrel 4.

[0058] Among them, in the plunger pump oil production device, "front" refers to the direction along the axial direction a of the sucker rod pump barrel 4 and pointing to the outlet, and "rear" is the direction opposite to "front"; "up" refers to the direction along the axial direction a of the sucker rod pump barrel 4 and pointing to the outlet ( Figure 1 the direction pointed by the arrow in the figure), and "down" is the direction opposite to "up"

[0059] The plunger pump oil production device provided by the above basic embodiment of the present invention can convert the rotational motion of the driving mechanism 1 into the linear push-pull motion of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump by connecting the driving connection assembly 2 between the plunger 3 of the oil pump and the driving mechanism 1. Thus, the purpose of driving the plunger 3 of the oil pump to move in the pump barrel 4 of the oil pump by the driving mechanism 1 can be achieved, reducing the huge intermediate transmission link of the pumping unit, reducing the lifting energy consumption, and significantly improving the oilfield lifting efficiency. Moreover, the driving connection assembly 2 can realize the linear push-pull motion of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump, reduce the wear caused by the offset of the plunger 3 of the oil pump, extend the pump inspection period, and reduce the workover operation cost. It can also realize intelligent oil production by only controlling the driving mechanism 1, meet the technical requirements of intelligent regulation of oil wells, and meet the requirements of the green and low-carbon development of oilfields. The plunger pump oil production device provided by the present invention can greatly reduce the oil production energy consumption and labor cost, boost the green development of oilfields, and has broad application prospects and significant social benefits.

[0060] The driving connection assembly 2 can be any component that can convert the rotational motion of the driving mechanism 1 into the linear push-pull motion of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump. Exemplarily, the driving connection assembly 2 can be a structure containing a lead screw. As a specific embodiment of the present invention, as Figure 2 shown, the driving connection assembly 2 includes a lead screw shaft 22 and a sliding sleeve 26. The sliding sleeve 26 is sleeved on the lead screw shaft 22 and is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the pump barrel 4 of the oil pump, one end of the lead screw shaft 22 is connected to the plunger 3 of the oil pump, and the other end is connected to the driving mechanism 1, so as to enable the sliding sleeve 26 to move along the axial direction a of the lead screw shaft 22 during the process of the driving mechanism 1 driving the lead screw shaft 22 to rotate, and realize the linear push-pull motion of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump through the movement of the sliding sleeve 26.

[0061] According to the present invention, the lead screw shaft 22 and the drive mechanism 1 can be directly connected, or can be connected through the first connecting member 21. The lead screw shaft 22 and the plunger 3 of the oil pump can be directly connected, or can be connected through the second connecting member 210. Preferably, the lead screw shaft 22 and the drive mechanism 1 are connected through the first connecting member 21, and the lead screw shaft 22 and the plunger 3 of the oil pump are connected through the second connecting member 210. The first connecting member 21 can be any connecting member that can realize the connection between the lead screw shaft 22 and the drive mechanism 1 and can drive the lead screw shaft 22 through the drive mechanism 1. The second connecting member 210 can be any connecting member that can relatively fix the lead screw shaft 22 and the plunger 3 of the oil pump. As a specific embodiment of the present invention, the first connecting member 21 is a spline connection, and the second connecting member 210 is a connector. The spline connection can transmit torque. The lead screw shaft 22 is a rotating member of the drive connection assembly 2 for transmitting torque. Its threaded connection with the sliding sleeve 16 can convert the torque provided by the drive mechanism 1 into a thrust and a pull force in the axial direction a, thereby realizing the linear push-pull movement of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump.

[0062] When the drive connection assembly 2 provided by the above embodiment works, taking the example that when the drive mechanism 1 drives the lead screw shaft 22 to rotate forward, the sliding sleeve 26 moves away from the drive mechanism 1 (moves upward), when the drive mechanism 1 drives the lead screw shaft 22 to rotate forward, a helical movement is formed between the lead screw shaft 22 and the sliding sleeve 26. During the helical movement, the sliding sleeve 26 will move upward along the thread of the lead screw shaft 22, and the upward movement of the sliding sleeve 26 will drive the pump barrel 4 of the oil pump upward. And the plunger 3 of the oil pump is connected to the lead screw shaft 22. The upward movement of the sliding sleeve 26 along the thread of the lead screw shaft 22 will drive the pump barrel 4 of the oil pump to move upward relative to the plunger 3 of the oil pump, which is equivalent to pulling the plunger 3 of the oil pump backward in the pump barrel 4 of the oil pump, so that a negative pressure is formed in the pump barrel 4 of the oil pump, and the oil fluid smoothly enters the pump barrel 4 of the oil pump under the action of the negative pressure; when the drive mechanism 1 drives the lead screw shaft 22 to rotate reversely, a helical movement is formed between the lead screw shaft 22 and the sliding sleeve 26. During the helical movement, the sliding sleeve 26 will move downward along the thread of the lead screw shaft 22, and the downward movement of the sliding sleeve 26 will drive the pump barrel 4 of the oil pump downward. And the plunger 3 of the oil pump is connected to the lead screw shaft 22. The downward movement of the sliding sleeve 26 along the thread of the lead screw shaft 22 will drive the pump barrel 4 of the oil pump to move downward relative to the plunger 3 of the oil pump, which is equivalent to pushing the plunger 3 of the oil pump forward in the pump barrel 4 of the oil pump, so that a positive pressure is formed in the pump barrel 4 of the oil pump, and the oil fluid smoothly discharges from the pump barrel 4 of the oil pump under the action of the positive pressure. And if driving the drive mechanism 1 to drive the lead screw shaft 22 to rotate forward can make the sliding sleeve 26 move in the direction close to the drive mechanism 1 (move downward), its action process is opposite to the above description, and will not be elaborated here one by one.

[0063] The drive connection component 2 structure provided by the above-described embodiment can convert the rotational motion of the drive mechanism 1 into a linear push-pull motion of the plunger 3 of the oil pump within the pump barrel 4 of the oil pump, can convert the torque provided by the drive mechanism 1 into axial thrust and tensile force, achieve the purpose of driving the plunger 3 of the oil pump to move within the pump barrel 4 of the oil pump through the drive mechanism 1, reduce the huge intermediate transmission link of the pumping unit, reduce the lifting energy consumption, and significantly improve the oilfield lifting efficiency; moreover, it can reduce the wear caused by the offset of the plunger 3 of the oil pump, extend the pump inspection period, and reduce the workover cost.

[0064] In a specific embodiment of the present invention, as Figure 2 shown, the drive connection component 2 includes a lead screw shaft 22, a sliding sleeve 26, an outer cylinder 211, and a first buffer member 25. Both the sliding sleeve 26 and the outer cylinder 211 are sleeved on the lead screw shaft 22. The sliding sleeve 26 is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the pump barrel 4 of the oil pump. The outer cylinder 211 is disposed below the sliding sleeve 26. The first buffer member 25 is connected between the sliding sleeve 26 and the outer cylinder 211. One end of the lead screw shaft 22 is connected to the plunger 3 of the oil pump, and the other end is connected to the drive mechanism 1, so as to enable the sliding sleeve 26 to move along the axial direction a of the lead screw shaft 22 during the process of the drive mechanism 1 driving the lead screw shaft 22 to rotate, and realize the linear push-pull motion of the plunger 3 of the oil pump within the pump barrel 4 of the oil pump through the movement of the sliding sleeve 26. The setting of the above-described embodiment can provide soft support when the sliding sleeve 26 moves downward, avoid hard impact between the sliding sleeve 26 and the outer cylinder 211 when the sliding sleeve 26 moves downward, and thus can reduce the possibility of current impact on the drive mechanism 1. The first buffer member 25 can be a spring or a combination of other springs and elastic material formed parts. Exemplarily, other elastic material formed parts can be polyurethane elastomer pads or rubber pads, etc. The first buffer member 25 is preferably a spring. The stretching and compression distances of the spring are longer, which can not only play its buffering role but also not affect the up and down movement of the sliding sleeve 26.

[0065] In a specific embodiment of the present invention, as Figure 2As shown in the figure, the driving connection assembly 2 includes a lead screw shaft 22, a sliding sleeve 26, an outer cylinder 211, and a first buffer member 25. Both the sliding sleeve 26 and the outer cylinder 211 are sleeved on the lead screw shaft 22. The sliding sleeve 26 is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the pump barrel 4 of the oil pump. The outer cylinder 211 is arranged below the sliding sleeve 26. A limiting structure for restricting the axial displacement of the sliding sleeve 26 in the axial direction a (up and down) on the lead screw shaft 22 is provided between the outer cylinder 211 and the lead screw shaft 22. The first buffer member 25 is connected between the sliding sleeve 26 and the outer cylinder 211. One end of the lead screw shaft 22 is connected to the plunger 3 of the oil pump, and the other end is connected to the driving mechanism 1, so that during the process of the driving mechanism 1 driving the lead screw shaft 22 to rotate, the sliding sleeve 26 can move along the axial direction a of the lead screw shaft 22, and the linear push-pull movement of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump can be realized through the movement of the sliding sleeve 26. The setting of this limiting structure can limit the reciprocating pumping distance of the plunger 3 of the oil pump in the pump barrel 4 of the oil pump, which can not only control the maximum pumping volume and the minimum pumping volume of the plunger pump oil production device, but also prevent the plunger 3 of the oil pump from sliding out of the pump barrel 4 of the oil pump or prevent the plunger 3 of the oil pump from hitting the top of the pump barrel 4 of the oil pump.

[0066] The limiting structure can be any structure that can limit the axial displacement of the sliding sleeve 26 in the axial direction a (up and down) on the lead screw shaft 22. As a specific embodiment of the present invention, as Figure 2 shown in the figure, the limiting structure includes a first limiting boss 212, a second limiting boss 213, a first limiting member 23, and a second limiting member 24. The first limiting boss 212 and the second limiting boss 213 are arranged on the outer cylinder 211 along the axial direction of the outer cylinder 211. The first limiting member 23 and the second limiting member 24 are connected to the lead screw shaft 22 along the axial direction a of the lead screw shaft 22. The first limiting member 23 and the second limiting member 24 are arranged between the first limiting boss 212 and the second limiting boss 213, and the first limiting member 23 can abut against the first limiting boss 212, and the second limiting member 24 can abut against the second limiting boss 213.

[0067] For the limiting structure provided by the above specific embodiment, the first limiting boss 212 and the second limiting boss 213 are arranged up and down, and the first limiting member 23 and the second limiting member 24 are also arranged up and down. Taking the first limiting boss 212 being arranged below the second limiting boss 213 as an example, at this time, the first limiting member 23 is arranged below the second limiting member 24. When the lead screw shaft 22 moves upward relative to the sliding sleeve 26 to a certain distance, the second limiting member 24 abuts against the lower bottom surface of the second limiting boss 213, realizing the limitation of the upward movement distance of the lead screw shaft 22 relative to the sliding sleeve 26. When the lead screw shaft 22 moves downward relative to the sliding sleeve 26 to a certain distance, the first limiting member 23 abuts against the upper bottom surface of the second limiting boss 213, realizing the limitation of the downward movement distance of the lead screw shaft 22 relative to the sliding sleeve 26.

[0068] The limiting structure provided by the above specific implementation manner can effectively limit the axial displacement of the sliding sleeve 26 on the lead screw shaft 22 in the axial direction a (up and down), and has a simple structure and a low design cost.

[0069] The first limiting member 23 and the second limiting member 24 can be any structure that can abut against the first limiting boss 212 or the second limiting boss 213. As a specific embodiment of the present invention, the first limiting member 23 and the second limiting member 24 are tapered bearings. The use of tapered bearings can not only provide upper and lower limiting supports and form an upper and lower limiting support effect on the lead screw shaft 22, but also reduce the circumferential rotation resistance.

[0070] In a specific embodiment of the present invention, as Figure 2 shown, the drive connection assembly 2 includes a lead screw shaft 22, a sliding sleeve 26 and a guiding structure. The sliding sleeve 26 is sleeved on the lead screw shaft 22 and is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the pump barrel 4 of the oil extraction pump, one end of the lead screw shaft 22 is connected to the plunger 3 of the oil extraction pump, and the other end is connected to the drive mechanism 1, so that during the process of the drive mechanism 1 driving the lead screw shaft 22 to rotate, the sliding sleeve 26 can move along the axial direction a of the lead screw shaft 22, and the linear push-pull movement of the plunger 3 of the oil extraction pump in the pump barrel 4 of the oil extraction pump can be realized through the movement of the sliding sleeve 26; the guiding structure is connected to the lead screw shaft 22 and is adapted to be inserted into the pump barrel 4 of the oil extraction pump to cooperate with the pump barrel 4 of the oil extraction pump to realize axial guiding in the axial direction a. The setting of the guiding structure can realize the circumferential movement limiting effect on the sliding sleeve 26, prevent the sliding sleeve 26 from rotating along with the lead screw shaft 22, force the sliding sleeve 26 and the upper-connected pump barrel 4 of the oil extraction pump to perform reciprocating up and down movements, and enable the energy output by the drive mechanism 1 to be converted into the kinetic energy of the up and down movement of the lead screw shaft 22 to a greater extent, further reducing energy consumption.

[0071] According to the present invention, the lead screw shaft 22 is connected to the plunger 3 of the oil extraction pump through a guiding structure.

[0072] The guiding structure can be any structure capable of guiding in the axial direction a between the lead screw shaft 22 and the sliding sleeve 26. As a specific embodiment of the present invention, the driving connection assembly 2 includes a lead screw shaft 22, a sliding sleeve 26 and a guiding structure. The sliding sleeve 26 is sleeved on the lead screw shaft 22 and is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the oil pump barrel 4, one end of the lead screw shaft 22 is connected to the oil pump plunger 3, and the other end is connected to the driving mechanism 1, so that during the process of the driving mechanism 1 driving the lead screw shaft 22 to rotate, the sliding sleeve 26 can move along the axial direction a of the lead screw shaft 22, and the linear push-pull movement of the oil pump plunger 3 in the oil pump barrel 4 can be realized through the movement of the sliding sleeve 26; the guiding structure includes a guiding limiting rib 27 connected to the lead screw shaft 22 and a guiding positioning collar 29 sleeved on the guiding limiting rib 27. The guiding positioning collar 29 abuts against the inner wall surface of the oil pump barrel 4 to realize the guiding in the axial direction a of the oil pump barrel 4.

[0073] Specifically, one end of the guiding limiting rib 27 is connected to the lead screw shaft 22, and the other end is connected to the oil pump plunger 3. One end of the guiding limiting rib 27 being connected to the lead screw shaft 22 can be integrally formed or separately formed and then welded, preferably integrally formed. Preferably, the guiding limiting rib 27 is connected to the oil pump plunger 3 through a second connecting member 210. One of the outer wall surface of the guiding limiting rib 27 and the inner wall surface of the guiding positioning collar 29 is provided with a groove, and the other is provided with a rib that cooperates with the groove. The rib extends along the circumferential direction of the lead screw shaft 22 and there are multiple ribs, and the multiple ribs are wound around the outer wall surface of the guiding limiting rib 27 or the inner wall surface of the guiding positioning collar 29. Through the cooperation between the rib and the groove, a circumferential limiting effect is formed on the lead screw sliding sleeve 26, preventing the sliding sleeve 26 from rotating with the lead screw shaft 22, forcing the sliding sleeve 26 and the upper-connected oil pump barrel 4 to move up and down reciprocally, so that the energy output by the driving mechanism 1 can be converted into the kinetic energy of the up and down movement of the lead screw shaft 22 to a greater extent, further reducing energy consumption.

[0074] In a specific embodiment of the present invention, such as Figure 2As shown, the drive connection assembly 2 includes a lead screw shaft 22, a sliding sleeve 26, and a guiding structure. The sliding sleeve 26 is sleeved on the lead screw shaft 22 and is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the pump barrel 4 of the oil extraction pump, and one end of the lead screw shaft 22 is connected to the plunger 3 of the oil extraction pump, and the other end is connected to the drive mechanism 1, so that during the process of the drive mechanism 1 driving the lead screw shaft 22 to rotate, the sliding sleeve 26 can move along the axial direction a of the lead screw shaft 22, and the linear push-pull movement of the plunger 3 of the oil extraction pump in the pump barrel 4 of the oil extraction pump can be realized through the movement of the sliding sleeve 26; the guiding structure includes a guiding limiting rib 27 connected to the lead screw shaft 22 and a guiding positioning collar 29 sleeved on the guiding limiting rib 27, and the guiding positioning collar 29 abuts against the inner wall surface of the pump barrel 4 of the oil extraction pump to realize the axial direction a guiding of the pump barrel 4 of the oil extraction pump; a second buffer member 28 is provided between the guiding positioning collar 29 and the sliding sleeve 26. The setting of the above embodiment can provide soft support when the sliding sleeve 26 moves upward, avoid the hard impact between the sliding sleeve 26 and the guiding positioning collar 29 when the sliding sleeve 26 moves upward, and thus can reduce the possibility of current impact on the drive mechanism 1. The second buffer member 28 can be a spring or a combination of other springs and elastic material formed parts. Exemplarily, other elastic material formed parts can be polyurethane elastomer pads or rubber pads, etc. The second buffer member 28 is preferably a spring, and the stretching and compression distances of the spring are longer, which can not only play its buffering role but also not affect the up and down movement of the sliding sleeve 26.

[0075] According to the present invention, the second buffer member 28 can be connected to the guiding positioning collar 29 or to the sliding sleeve 26. As a specific embodiment of the present invention, the second buffer member 28 is connected to the guiding positioning collar 29.

[0076] The plunger 3 of the oil extraction pump can be any kind of plunger structure. As a specific embodiment of the present invention, the plunger 3 of the oil extraction pump includes a plunger connecting rod 31 and a plunger traveling valve provided on the plunger connecting rod 31. Specifically, the plunger connecting rod 31 is connected to the drive connection assembly 2. The plunger connecting rod 31 is used to transmit the reciprocating movement thrust or pull. The plunger traveling valve is a one-way valve, which discharges liquid when the whole plunger 3 of the oil extraction pump moves downward and takes in liquid when it moves upward, and can enable the plunger pump oil production device to extract or discharge as much liquid as possible at one time, thereby improving the oil production efficiency of the plunger pump oil production device.

[0077] As a specific embodiment of the present invention, as Figure 3 shown, the plunger 3 of the oil extraction pump includes a plunger connecting rod 31 and a plunger traveling valve provided on the plunger connecting rod 31. There are two plunger traveling valves, which are respectively a first plunger traveling valve 32 and a second plunger traveling valve 33, and the first plunger traveling valve 32 and the second plunger traveling valve 33 are arranged along the axial direction a of the plunger connecting rod 31.

[0078] The pump barrel 4 of the sucker rod pump is a fixed component of the sucker rod pump and can be any pump barrel structure. Generally, it is composed of an inner tube, an outer tube and a valve group, and is used to provide a flow channel for lifting liquid. As a specific embodiment of the present invention, as Figure 4 shown, the pump barrel 4 of the sucker rod pump includes a pump barrel inner cylinder 42, a pump barrel two-way structure 46 connected to one end of the pump barrel inner cylinder 42, and a pump barrel outer cylinder 43 sleeved on the pump barrel inner cylinder 42. A first liquid flow channel is formed in the pump barrel inner cylinder 42, and a second liquid flow channel is formed between the pump barrel inner cylinder 42 and the pump barrel outer cylinder 43. The first liquid flow channel and the second liquid flow channel are communicated. The liquid is adapted to enter the first liquid flow channel from the pump barrel two-way structure 46, then enter the second liquid flow channel, and flow to the outside of the pump barrel 4 of the sucker rod pump through the pump barrel two-way structure 46. The pump barrel inner cylinder 42 can cooperate with the sucker rod pump plunger 3 to complete the liquid pumping action.

[0079] When the pump barrel 4 of the sucker rod pump provided in the above embodiment works, the sucker rod pump plunger 3 is inserted into the pump barrel inner cylinder 42. When it is necessary to suck liquid, the sucker rod pump plunger 3 is pulled downward relative to the pump barrel 4 of the sucker rod pump, and a negative pressure is formed in the pump barrel 4 of the sucker rod pump. The liquid enters from the inlet of the pump barrel 4 of the sucker rod pump, passes through the pump barrel two-way structure 46 and enters the first liquid flow channel, and then enters the second liquid flow channel through the first liquid flow channel; when it is necessary to discharge liquid, the sucker rod pump plunger 3 is pushed upward relative to the pump barrel 4 of the sucker rod pump, and a positive pressure is formed in the pump barrel 4 of the sucker rod pump, and the liquid in the first liquid flow channel and the second liquid flow channel is discharged to the outlet of the pump barrel 4 of the sucker rod pump through the pump barrel two-way structure 46, and then discharged from the outlet of the pump barrel 4 of the sucker rod pump.

[0080] In a specific embodiment of the present invention, as Figure 4As shown, the pump barrel 4 of the sucker rod pump includes an inner pump barrel 42, a two-way pump barrel structure 46 connected to one end of the inner pump barrel 42, and an outer pump barrel 43 sleeved on the inner pump barrel 42. A support structure is provided on the outer pump barrel 43, and the inner pump barrel 42 can be erected on the support structure. A first liquid flow channel is formed inside the inner pump barrel 42, and a second liquid flow channel is formed between the inner pump barrel 42 and the outer pump barrel 43. The first liquid flow channel and the second liquid flow channel are connected. The liquid is adapted to enter the first liquid flow channel from the two-way pump barrel structure 46, then enter the second liquid flow channel, and flow to the outside of the pump barrel 4 of the sucker rod pump through the two-way pump barrel structure 46. The support structure can be any structure capable of supporting the inner pump barrel 42. Specifically, it can be a boss provided on the inner wall surface of the outer pump barrel 43. There can be one or multiple bosses. When there is one boss, the boss can be in the shape of a ring or a circle, and the circular outer wall surface of the boss is connected to the inner wall surface of the outer pump barrel 43. When there are multiple bosses, the multiple bosses are arranged circumferentially on the inner wall surface of the outer pump barrel 43. The setting of the support structure can support the inner pump barrel 42 and does not completely seal between the inner pump barrel 42 and the outer pump barrel 43, ensuring the smooth flow of liquid between the first liquid flow channel and the second liquid flow channel.

[0081] In a specific embodiment of the present invention, the pump barrel 4 of the sucker rod pump includes an inner pump barrel 42, a two-way pump barrel structure 46 connected to one end of the inner pump barrel 42, and an outer pump barrel 43 sleeved on the inner pump barrel 42. An inlet check valve is further provided inside the inner pump barrel 42, and a first liquid flow channel is formed inside the inner pump barrel 42, and a second liquid flow channel is formed between the inner pump barrel 42 and the outer pump barrel 43. The first liquid flow channel and the second liquid flow channel are connected. The liquid is adapted to enter the first liquid flow channel from the two-way pump barrel structure 46, then enter the second liquid flow channel, and flow to the outside of the pump barrel 4 of the sucker rod pump through the two-way pump barrel structure 46. The above setting can achieve the rapid entry and discharge of liquid, prevent the reverse flow of liquid, and can also achieve the entry and discharge of liquid simultaneously.

[0082] As a specific embodiment of the present invention, as Figure 4As shown, the pump barrel 4 of the sucker rod pump includes an inner pump barrel 42, a two-way pump barrel structure 46 connected to one end of the inner pump barrel 42, and an outer pump barrel 43 sleeved on the inner pump barrel 42. An inlet check valve is also arranged inside the inner pump barrel 42. There are two groups of inlet check valves, namely a first check valve 44 and a second check valve 45. The first check valve 44 and the second check valve 45 are arranged along the axial direction of the inner pump barrel 42, and the flow directions of the first check valve 44 and the second check valve 45 are the same; a first liquid flow channel is formed inside the inner pump barrel 42, and a second liquid flow channel is formed between the inner pump barrel 42 and the outer pump barrel 43. The first liquid flow channel and the second liquid flow channel are connected. The liquid is adapted to enter the first liquid flow channel from the two-way pump barrel structure 46, then enter the second liquid flow channel, and flow to the outside of the pump barrel 4 of the sucker rod pump through the two-way pump barrel structure 46.

[0083] The two-way pump barrel structure 46 can be any structure with two independent channels. One channel is used to inject liquid into the first liquid flow channel, and the other channel can discharge the second liquid flow channel. As a specific embodiment of the present invention, as Figure 1 and Figure 5 shown, the pump barrel 4 of the sucker rod pump includes an inner pump barrel 42, a two-way pump barrel structure 46 connected to one end of the inner pump barrel 42, and an outer pump barrel 43 sleeved on the inner pump barrel 42. And a first liquid flow channel is formed inside the inner pump barrel 42, and a second liquid flow channel is formed between the inner pump barrel 42 and the outer pump barrel 43. The first liquid flow channel and the second liquid flow channel are connected. A first channel 461 and a second channel 462 are arranged inside the two-way pump barrel structure 46. The inlet of the first channel 461 is connected to the inlet of the pump barrel 4 of the sucker rod pump, and the outlet is connected to the first liquid flow channel; the inlet of the second channel 462 is connected to the second liquid flow channel, and the outlet is connected to the outlet of the pump barrel 4 of the sucker rod pump. The first channel 461 and the second channel 462 are mutually independent flow channels and are not connected to each other, and can simultaneously realize the functions of liquid inlet and liquid outlet.

[0084] In a specific embodiment of the present invention, as Figure 4 shown, a pump barrel sealing structure 41 is arranged between the pump barrel 4 of the sucker rod pump and the sucker rod pump plunger 3. The pump barrel sealing structure 41 can be any structure that can form a sealing effect. As a specific embodiment of the present invention, the pump barrel sealing structure 41 is a pump barrel sealing ring. The setting of the pump barrel sealing structure 41 is used to isolate the liquid and prevent the liquid in the pump barrel 4 of the sucker rod pump from leaking.

[0085] In a specific embodiment of the present invention, as Figure 1As shown in the figure, the plunger pump oil production device includes a driving mechanism 1, an outlet check valve 5, a sucker rod pump barrel 4, a sucker rod pump plunger 3 inserted into the sucker rod pump barrel 4, and a driving connection assembly 2 connected between the sucker rod pump plunger 3 and the driving mechanism 1. The driving connection assembly 2 can convert the rotational motion of the driving mechanism 1 into the linear push-pull motion of the sucker rod pump plunger 3 in the sucker rod pump barrel 4. The outlet check valve 5 is arranged at the outlet of the sucker rod pump barrel 4. The arrangement of the outlet check valve 5 can prevent the well fluid from flowing back from top to bottom and can be connected to the upper tubing at the same time.

[0086] According to the present invention, both the driving mechanism 1 and the outlet check valve 5 are currently mature technologies and no significant technical improvements are made in the present invention, so they will not be described in detail here.

[0087] As a relatively preferred specific embodiment of the present invention, refer to Figures 1 to 5, the plunger pump oil production device includes a driving mechanism 1, an outlet check valve 5, a sucker rod pump barrel 4, a sucker rod pump plunger 3 inserted into the sucker rod pump barrel 4, and a driving connection assembly 2 connected between the sucker rod pump plunger 3 and the driving mechanism 1. The outlet check valve 5 is arranged at the outlet of the sucker rod pump barrel 4; the sucker rod pump barrel 4 includes a pump barrel inner cylinder 42, a pump barrel two-way structure 46 connected to one end of the pump barrel inner cylinder 42, and a pump barrel outer cylinder 43 sleeved on the pump barrel inner cylinder 42. A support structure is arranged on the pump barrel outer cylinder 43, and the pump barrel inner cylinder 42 can be erected on the support structure; an inlet check valve is also arranged in the pump barrel inner cylinder 42. There are two groups of inlet check valves, namely a first check valve 44 and a second check valve 45. The first check valve 44 and the second check valve 45 are arranged along the axial direction of the pump barrel inner cylinder 42, and the flow directions of the first check valve 44 and the second check valve 45 are the same; a first liquid flow channel is formed in the pump barrel inner cylinder 42, and a second liquid flow channel is formed between the pump barrel inner cylinder 42 and the pump barrel outer cylinder 43. The first liquid flow channel and the second liquid flow channel are connected. A first channel 461 and a second channel 462 are arranged in the pump barrel two-way structure 46. The inlet of the first channel 461 is connected to the inlet of the sucker rod pump barrel 4, and the outlet is connected to the first liquid flow channel; the inlet of the second channel 462 is connected to the second liquid flow channel, and the liquid coming out of the outlet is discharged from the outlet of the sucker rod pump barrel 4 through the outlet check valve 5; a pump barrel sealing structure 41 is arranged between the sucker rod pump barrel 4 and the sucker rod pump plunger 3; the driving connection assembly 2 includes a lead screw shaft 22, a sliding sleeve 26, an outer cylinder 211, a first buffer member 25, and a guiding structure. Both the sliding sleeve 26 and the outer cylinder 211 are sleeved on the lead screw shaft 22. The sliding sleeve 26 is threadedly connected to the lead screw shaft 22. One end of the sliding sleeve 26 is connected to the sucker rod pump barrel 4. The outer cylinder 211 is arranged below the sliding sleeve 26. A limiting structure for restricting the axial displacement of the sliding sleeve 26 on the lead screw shaft 22 in the axial direction a (up and down) is arranged between the outer cylinder 211 and the lead screw shaft 22. The limiting structure includes a first limiting boss 212, a second limiting boss 213, a first limiting member 23, and a second limiting member 24. The first limiting boss 212 and the second limiting boss 213 are arranged on the outer cylinder 211 along the axial direction of the outer cylinder 211. The first limiting member 23 and the second limiting member 24 are connected to the lead screw shaft 22 along the axial direction a of the lead screw shaft 22. The first limiting member 23 and the second limiting member 24 are arranged between the first limiting boss 212 and the second limiting boss 213, and the first limiting member 23 can abut against the first limiting boss 212, and the second limiting member 24 can abut against the second limiting boss 213. The first limiting member 23 and the second limiting member 24 are tapered bearings; the first buffer member 25 is connected between the sliding sleeve 26 and the outer cylinder 211; the guiding structure includes a guiding limiting rib 27 connected to the lead screw shaft 22 and a guiding positioning collar 29 sleeved on the guiding limiting rib 27. The guiding positioning collar 29 abuts against the inner wall surface of the pump barrel inner cylinder 42 of the pumping barrel to realize the axial direction a guiding of the sucker rod pump barrel 4;One end of the lead screw shaft 22 is connected, and the other end is connected to the drive mechanism 1. The plunger 3 of the oil extraction pump can move the sliding sleeve 26 along the axial direction a of the lead screw shaft 22 during the rotation of the lead screw shaft 22 driven by the drive mechanism 1, and realize the linear push-pull movement of the plunger 3 of the oil extraction pump in the inner barrel 42 of the pump barrel through the movement of the sliding sleeve 26; A second buffer 28 is provided between the guiding and positioning collar 29 and the sliding sleeve 26; The plunger 3 of the oil extraction pump includes a plunger connecting rod 31 and a plunger floating valve provided on the plunger connecting rod 31. The plunger connecting rod 31 is connected to the guiding and limiting rib 27. There are two plunger floating valves, namely the first plunger floating valve 32 and the second plunger floating valve 33. The first plunger floating valve 32 and the second plunger floating valve 33 are arranged along the axial direction a of the plunger connecting rod 31. When the plunger 3 of the oil extraction pump moves downward as a whole, drainage is completed, and when it moves upward, liquid intake is completed; The drive mechanism 1 is a low-speed permanent magnet motor.;

[0088] When the plunger pump oil production device provided by the above preferred embodiment of the present invention is working, when the drive mechanism 1 drives the lead screw shaft 22 to rotate, when the sliding sleeve 26 moves downward, the liquid enters from the inlet of the plunger pump oil production device, passes through the first channel 461, the first check valve 44 and the second check valve 45 and enters the first liquid circulation channel and the second liquid circulation channel; When the drive mechanism 1 drives the lead screw shaft 22 to rotate, when the sliding sleeve 26 moves upward, the liquid in the first liquid circulation channel and the second liquid circulation channel is discharged from the outlet of the plunger pump oil production device through the second channel 462 and the outlet check valve 5. The suction and discharge of the liquid of this device can be carried out simultaneously.

[0089] In the oil production device of the plunger pump provided by the above preferred embodiment of the present invention, during operation, the load of the above-mentioned drive connection assembly 2 is 3 times that of the ball screw, and the service life is 15 times that of the ball screw. The screw stroke is 1-2 m (i.e., the stroke of the plunger pump); it is applied in the field of downhole oil pumps for the first time and can meet the requirements of large thrust and high service life operation. When calculating the liquid column load of 3.4 t for a plunger pump with a diameter of φ44 mm and a depth of 3000 m, through the structural design of the drive connection assembly 2 of the present invention, it can meet the ultimate thrust of 6 t, the motor power is 15 kw, and the operating power ≤ 10 kw. The large and small flat cables + protective cover are used to prevent damage to the cable during hoisting, and the system runs stably and reliably. By combining the technology of a low-speed rotating permanent magnet motor, on the one hand, the reduction mechanism can be cancelled through the above-mentioned drive connection assembly 2. On the other hand, compared with a three-phase asynchronous motor, the energy consumption of the oilfield artificial lift system can be significantly reduced (15%-25%). The smooth forward and reverse rotation of the downhole motor is realized by using position monitoring + signal line + ground control. Through precise ground control, the smooth start and operation of the plunger 3 of the oil pump, the automatic adjustment of the up and down stroke time and the stroke frequency are realized, and the vibration problem and the low pump filling degree problem caused by the too fast upstroke speed (2 s) of the linear motor submersible plunger pump are solved. The plunger connecting rod 31 and the lead screw shaft 22 mainly bear tensile forces and can avoid bending under large thrust. Overall, through the present invention, the pumping unit lifting technology currently used in oilfields can be effectively replaced, and low-energy consumption, high-efficiency, and intelligent lifting can be realized.

[0090] The plunger pump oil production device provided by the above preferred embodiment of the present invention is a new type of artificial lift device for oil wells. The device is powered by a downhole low-speed rotating permanent magnet motor, and the drive connection assembly 2 converts the rotational motion provided by the motor into a linear reciprocating motion of the plunger, and no reduction device is required in the middle, so as to achieve the purpose of pumping oil with a downhole rotating permanent magnet motor; the device avoids the disadvantages of current impact and poor stability of downhole linear motors, makes full use of the advantages of rotating permanent magnet motors and downhole plunger oil pumps, and provides a new oil production device for oilfields.

[0091] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0092] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. In addition, any combination can be made between different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. A plunger pump oil production device, characterized in that, It includes a driving mechanism (1), a sucker rod pump barrel (4), a sucker rod pump plunger (3) inserted into the sucker rod pump barrel (4), and a driving connection assembly (2) connected between the sucker rod pump plunger (3) and the driving mechanism (1). The driving connection assembly (2) can convert the rotational motion of the driving mechanism (1) into the linear push-pull motion of the sucker rod pump plunger (3) in the sucker rod pump barrel (4).

2. The plunger pump oil production device according to claim 1, characterized in that, The driving connection assembly (2) includes a lead screw shaft (22) and a sliding sleeve (26). The sliding sleeve (26) is sleeved on the lead screw shaft (22) and is threadedly connected to the lead screw shaft (22). One end of the sliding sleeve (26) is connected to the sucker rod pump barrel (4), one end of the lead screw shaft (22) is connected to the sucker rod pump plunger (3), and the other end is connected to the driving mechanism (1), so that during the process of the driving mechanism (1) driving the lead screw shaft (22) to rotate, the sliding sleeve (26) can move along the axial direction (a) of the lead screw shaft (22), and the linear push-pull motion of the sucker rod pump plunger (3) in the sucker rod pump barrel (4) is realized through the movement of the sliding sleeve (26).

3. The plunger pump oil production device according to claim 2, characterized in that, The driving connection assembly (2) further includes an outer cylinder (211) sleeved on the lead screw shaft (22) and a first buffer member (25) connected between the outer cylinder (211) and the sliding sleeve (26).

4. The plunger pump oil production device according to claim 3, characterized in that, The first buffer member (25) is a spring.

5. The plunger pump oil production device according to claim 3, characterized in that, A limiting structure is provided between the outer cylinder (211) and the lead screw shaft (22) for limiting the axial displacement of the sliding sleeve (26) on the lead screw shaft (22).

6. The plunger pump oil production device according to claim 5, characterized in that, The limiting structure includes a first limiting boss (212), a second limiting boss (213), a first limiting member (23), and a second limiting member (24). The first limiting boss (212) and the second limiting boss (213) are arranged on the outer cylinder (211) along the axial direction of the outer cylinder (211). The first limiting member (23) and the second limiting member (24) are connected to the lead screw shaft (22) along the axial direction (a) of the lead screw shaft (22). The first limiting member (23) and the second limiting member (24) are arranged between the first limiting boss (212) and the second limiting boss (213), and the first limiting member (23) can abut against the first limiting boss (212), and the second limiting member (24) can abut against the second limiting boss (213).

7. The plunger pump oil production device according to claim 6, characterized in that, The first limiting member (23) and the second limiting member (24) are tapered bearings.

8. The plunger pump oil production device according to any one of claims 2 to 7, characterized in that, The driving connection assembly (2) further includes a guiding structure connected to the lead screw shaft (22). The guiding structure is adapted to be inserted into the sucker rod pump barrel (4) and can cooperate with the sucker rod pump barrel (4) to achieve axial guiding.

9. The plunger pump oil production device according to claim 8, characterized in that, The guiding structure includes a guiding limit rib (27) connected to the lead screw shaft (22) and a guiding positioning collar (29) sleeved on the guiding limit rib (27), and the guiding limit rib (27) abuts against the inner wall surface of the oil pump barrel (4).

10. The plunger pump oil production device according to claim 9, characterized in that, A second buffer member (28) is provided between the guiding positioning collar (29) and the sliding sleeve (26).

11. The plunger pump oil production device according to claim 10, characterized in that, The second buffer member (28) is a spring.

12. The plunger pump oil production device according to any one of claims 1 to 7, characterized in that, The oil pump plunger (3) includes a plunger connecting rod (31) and a plunger traveling valve provided on the plunger connecting rod (31).

13. The plunger pump oil production device according to claim 12, characterized in that, There are two plunger traveling valves, namely a first plunger traveling valve (32) and a second plunger traveling valve (33), and the first plunger traveling valve (32) and the second plunger traveling valve (33) are arranged along the axial direction of the plunger connecting rod (31).

14. The plunger pump oil production device according to any one of claims 1 to 7, characterized in that, The oil pump barrel (4) includes an inner barrel of the barrel (42), a barrel two-way structure (46) connected to one end of the inner barrel of the barrel (42), and an outer barrel of the barrel (43) sleeved on the inner barrel of the barrel (42). A first liquid flow channel is formed inside the inner barrel of the barrel (42), and a second liquid flow channel is formed between the inner barrel of the barrel (42) and the outer barrel of the barrel (43). The first liquid flow channel and the second liquid flow channel are communicated. The liquid is adapted to enter the first liquid flow channel from the barrel two-way structure (46), then enter the second liquid flow channel, and flow to the outside of the oil pump barrel (4) through the barrel two-way structure (46).

15. The plunger pump oil production device according to claim 14, wherein, A support structure is provided on the outer barrel of the barrel (43), and the inner barrel of the barrel (42) can be erected on the support structure.

16. The plunger pump oil production device according to claim 14, characterized in that, An inlet check valve is further provided inside the inner barrel of the barrel (42).

17. The plunger pump oil production device according to claim 16, characterized in that, There are two groups of inlet check valves, namely a first check valve (44) and a second check valve (45), and the first check valve (44) and the second check valve (45) are arranged along the axial direction of the inner barrel of the barrel (42).

18. The plunger pump oil production device according to claim 14, characterized in that, A first channel (461) and a second channel (462) are provided inside the barrel two-way structure (46). The inlet of the first channel (461) is communicated with the inlet of the oil pump barrel (4), and the outlet is communicated with the first liquid flow channel; the inlet of the second channel (462) is communicated with the second liquid flow channel, and the outlet is communicated with the outlet of the oil pump barrel (4).

19. The plunger pump oil production device according to any one of claims 1 to 7, characterized in that, A barrel sealing structure (41) is provided between the oil pump barrel (4) and the oil pump plunger (3).

20. The plunger pump oil production device according to any one of claims 1 to 7, characterized in that, An outlet check valve (5) is further included, and the outlet check valve (5) is provided at the outlet of the oil pump barrel (4).

Images