Eccentric-wear-free hydraulic lifting oil extraction device

Abstract

The invention belongs to the technical field of oil extraction, and particularly relates to an eccentric-wear-free hydraulic lifting oil extraction device. The device comprises an oil gathering pipe, a connecting sleeve and a hydraulic assembly, the oil gathering pipe is connected with an oil pumping liquid inlet pipe through the connecting sleeve, the oil gathering pipe is connected with an oil liquid output pipe through an oil pipe nipple, the hydraulic assembly is installed on the connecting sleeve and comprises a plug rod, one end of the plug rod is connected with a piston head, and an oil well pump is installed at the other end of the plug rod; the reversing pressure relief assembly further comprises a valve element seat and a valve element sleeve which are attached to the outer wall of the plug rod, the valve element seat is in sliding fit with the valve element sleeve, communicating cavities are formed in the valve element seat and the valve element sleeve, and a reversing plate is installed on the plug rod. Automatic reversing of the plug rod is achieved through the reversing plate, and meanwhile pipeline damage caused by high-pressure impact of hydraulic oil on input hydraulic oil pipelines of the first path and the second path in the reversing process is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil production, and particularly relates to a non-eccentric wear hydraulic lifting oil production device. Background Art

[0002] In oil production operations in the domestic and international petroleum industries, hydraulic pumping units are commonly used for oil production. The hydraulic cylinder is used to lift instead of the beam pumping unit. The hydraulic cylinder usually drives the plunger through the sucker rod to reciprocate in the pump barrel, thereby driving the oil and water into the plunger and the tubing to achieve the exploitation of oil and water.

[0003] At present, the reversing valves on the market are huge in volume, so that the reversing valve can only be installed on the ground for reversing operation. As a result, the reversing valve is in this state of pressure fluctuation and change for a long time, and the service life of the hydraulic pipeline will be reduced. Therefore, there is a hydraulic pumping device with self-reversing in the prior art. For example, the invention patent with the publication number of CN119288397A mainly uses the positioning ring on the piston rod to push the valve core to achieve reversing.

[0004] However, the following problems exist when this solution is used; First, at the moment of reversing the hydraulic cylinder, the direction of the hydraulic oil needs to be changed rapidly, which will cause a large instantaneous change in the pressure in the hydraulic system. For example, when the reversing valve suddenly switches the oil circuit, the high-pressure oil flowing to one side of the cylinder suddenly stops flowing, and the other side starts to supply oil. Due to the inertia and compressibility of the hydraulic oil, the high-pressure oil flowing to the cylinder generates a pressure shock in the hydraulic system, causing damage to the pipeline.

[0005] Second, during the process of lifting and producing oil by the hydraulic cylinder, when the movement of the hydraulic cylinder suddenly stops, the high-pressure oil on one side of the cylinder suddenly stops flowing, thereby generating a hydraulic shock. The hydraulic shock will cause an instantaneous high pressure to the hydraulic system, and this pressure may damage hydraulic components and pipelines, etc. Summary of the Invention

[0006] The purpose of the present invention is to provide a non-eccentric wear hydraulic lifting oil production device for the deficiencies of the prior art to solve the technical problems in the prior art.

[0007] The object of the present invention can be achieved by the following technical solutions: An unbiased grinding hydraulic lifting oil production device, which includes a collecting oil pipe, a connecting sleeve and a hydraulic component. The collecting oil pipe is connected to a pumping liquid inlet pipe through the connecting sleeve. The collecting oil pipe is connected to an oil liquid output pipe through a short oil pipe section. The hydraulic component is installed on the connecting sleeve. The hydraulic component includes a plug rod, one end of the plug rod is connected to a piston head, and a oil pump is installed at the other end of the plug rod. A reversing pressure relief component is installed on the hydraulic component. The hydraulic component includes a top oil inlet, a bottom oil inlet, a top oil outlet and a bottom oil outlet. The reversing pressure relief component includes an oil port 1, an oil port 2, an oil port 3, an oil port 4, an oil port 5, an oil port 6, an oil port 7, an oil port 7, and an oil port 8. The hydraulic oil input pipes are respectively connected to the oil port 1 and the oil port 3. The hydraulic oil is input into the top oil inlet through the oil port 1 and the oil port 2, and is input into the bottom oil inlet through the oil port 3 and the oil port 4. The hydraulic oil output pipes are respectively connected to the oil port 6 and the oil port 8. The hydraulic oil at the top of the piston head is discharged through the top oil outlet, the oil port 7 and the oil port 8, and the hydraulic liquid at the bottom of the piston head is discharged through the bottom oil outlet, the oil port 5 and the oil port 6. The reversing pressure relief component further includes a valve core seat and a valve core sleeve that fit on the outer wall of the plug rod. The valve core seat and the valve core sleeve are in sliding fit, and communication cavities are provided on both the valve core seat and the valve core sleeve. A reversing plate is installed on the plug rod. During the lifting and lowering of the plug rod, the reversing plate respectively pushes the valve core sleeve and the valve core seat to move.

[0008] As a further optimization or improvement of this solution, a telescopic ball head is installed on the inner wall of the reversing pressure relief component. Ball grooves are provided on both the valve core seat and the valve core sleeve, and the telescopic ball head is matched with the ball grooves.

[0009] As a further optimization or improvement of this solution, the reversing plate includes a far pressing plate and a near pressing plate. During the lifting and lowering of the plug rod, the far pressing plate first pushes the valve core sleeve, and then the near pressing plate pushes the valve core seat.

[0010] As a further optimization or improvement of this solution, a vertical groove is provided on the valve core seat, a slider is installed on the valve core sleeve, the slider is in sliding fit with the vertical groove, and a return spring is installed between the slider and the inner wall of the vertical groove.

[0011] As a further optimization or improvement of this solution, an electromagnetic chuck is installed on the vertical groove, and a magnetic metal sheet is installed in the slider. The electromagnetic chuck attracts the magnetic metal sheet.

[0012] As a further optimization or improvement of this solution, rollers are installed inside the slider. The rollers are in contact with the outer wall of the plug rod, and the rollers are connected to the inner wall of the slider through compression springs.

[0013] As a further optimization or improvement of this solution, an inclined groove is provided in the vertical groove, and the slider is in sliding fit with the inclined groove.

[0014] The beneficial effects of the present invention: (1)When the piston head moves to the top, the far pressure plate first pushes the valve core sleeve upward. As the valve core sleeve moves upward, oil port five and oil port six gradually communicate. At this time, a part of the hydraulic oil inside the hydraulic component can be discharged outward through the bottom oil drain port, oil port five and oil port six. Before commutation, the pressure of the first-way input hydraulic oil pipeline is effectively reduced, avoiding high-pressure impact of the hydraulic oil on the first-way input hydraulic oil pipeline during commutation, and thus preventing damage to the first-way input hydraulic oil pipeline. As the piston head moves upward, the near pressure plate then pushes the valve core seat upward. Oil port one and oil port two are connected through the communication cavity. The hydraulic oil enters the top oil inlet through the second-way input hydraulic oil pipeline. At this time, the hydraulic oil pushes the piston head and the plug rod downward, thereby realizing the commutation operation of the plug rod. The present invention realizes the automatic commutation of the plug rod through the commutation plate, and at the same time avoids high-pressure impact of the hydraulic oil on the first-way and second-way input hydraulic oil pipelines during commutation, resulting in pipeline damage.

[0015] (2)During the process of lifting oil production in the present invention, if the hydraulic component suddenly stops, the top electromagnetic chuck built in the vertical groove starts. The electromagnetic chuck attracts the magnetic metal sheet built in the slider, causing the valve core sleeve to move upward. Oil port five and oil port six gradually communicate. At this time, a part of the hydraulic oil inside the hydraulic component can be discharged outward through the bottom oil drain port, oil port five and oil port six, relieving the pressure of the first-way input hydraulic oil pipeline and avoiding damage to the hydraulic components caused by the backlog of the first-way input hydraulic oil pipeline due to the sudden stop of the hydraulic component.

[0016] Specifically, as the slider moves close to the electromagnetic chuck, under the sliding fit of the slider and the inclined groove, the slider gradually moves obliquely. At this time, the roller is pressed into the slider, causing the slider to press against the outer wall of the plug rod, clamping and limiting the plug rod by the slider, and preventing the piston head from losing pressure and moving downward during the pressure relief process of the first-way input hydraulic oil pipe, so that the extracted oil liquid is pushed into the wellhead by the action of the piston head. Brief Description of the Drawings

[0017] The present invention will be further described below with reference to the drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is an internal view of the overall structure of the present invention.

[0020] Figure 3 It is Figure 2 An enlarged view of the structure of part A of

[0021] Figure 4 It is a schematic diagram of the overall structure of the hydraulic component and the commutation pressure relief component.

[0022] Figure 5 It is a schematic diagram of the internal structure of the hydraulic component.

[0023] Figure 6 It is a schematic diagram of the pipeline connection between the hydraulic component and the commutation pressure relief component.

[0024] Figure 7 It is a mating diagram of oil port 1, oil port 2, oil port 5 and oil port 6 with the valve core seat and the valve core sleeve.

[0025] Figure 8 It is a mating diagram of oil port 3, oil port 4, oil port 7 and oil port 8 with the valve core seat and the valve core sleeve.

[0026] Figure 9 It is a mating diagram of the valve core seat, the valve core sleeve and the plug rod.

[0027] Figure 10 It is an exploded view of the valve core seat, the plug rod and the valve core sleeve.

[0028] Figure 11 It is an exploded view of the back side of the valve core sleeve, the plug rod and the valve core seat.

[0029] Figure 12 It is a mating diagram of the slider and the vertical groove.

[0030] Figure 13 It is a mating diagram of the slider and the inclined groove.

[0031] In the figure, the markings are: 1. Oil collecting pipe; 2. Short oil pipe joint; 3. Connecting sleeve; 4. Oil pumping inlet pipe; 5. Hydraulic component; 501. Top oil inlet; 502. Bottom oil inlet; 503. Top oil drain; 504. Bottom oil drain; 505. Plug rod; 506. Piston head; 508. Commutation plate; 5080. Remote pressure plate; 5081. Near pressure plate; 6. Commutation pressure relief component; 601. Oil port 1; 602. Oil port 2; 603. Oil port 3; 604. Oil port 4; 605. Oil port 5; 606. Oil port 6; 607. Oil port 7; 608. Oil port 8; 609. Valve core seat; 610. Valve core sleeve; 611. Communication cavity; 612. Ball groove; 613. Slider; 614. Vertical groove; 615. Return spring; 616. Electromagnetic chuck; 617. Magnetic metal sheet; 618. Roller; 619. Compression spring; 620. Inclined groove. Specific implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] See Figures 1-9, a non-bias grinding hydraulic lifting oil production device, which includes a collecting oil pipe 1, a connecting sleeve 3 and a hydraulic component 5. The collecting oil pipe 1 is connected to a pumping oil inlet pipe 4 through the connecting sleeve 3. The collecting oil pipe 1 is connected to an oil fluid output pipe through a short oil pipe 2. The hydraulic component 5 is installed on the connecting sleeve 3. The hydraulic component 5 includes a plug rod 505. One end of the plug rod 505 is connected to a piston head 506, and a oil pump is installed at the other end of the plug rod 505. A reversing pressure relief component 6 is installed on the hydraulic component 5. The hydraulic component 5 includes a top oil inlet 501, a bottom oil inlet 502, a top oil outlet 503 and a bottom oil outlet 504. The reversing pressure relief component 6 includes an oil port one 601, an oil port two 602, an oil port three 603, an oil port four 604, an oil port five 605, an oil port six 606, an oil port seven 607, an oil port seven 607, an oil port eight 608. The hydraulic oil input pipes are respectively connected to the oil port one 601 and the oil port three 603. The hydraulic oil is input into the top oil inlet 501 through the oil port one 601 and the oil port two 602, and is input into the bottom oil inlet 502 through the oil port three 603 and the oil port four 604. The hydraulic oil output pipes are respectively connected to the oil port six 606 and the oil port eight 608. The hydraulic oil at the top of the piston head 506 is discharged through the top oil outlet 503, the oil port seven 607 and the oil port eight 608. The hydraulic fluid at the bottom of the piston head 506 is discharged through the bottom oil outlet 504, the oil port five 605 and the oil port six 606. The reversing pressure relief component 6 further includes a valve core seat 609 and a valve core sleeve 610 that fit on the outer wall of the plug rod 505. The valve core seat 609 and the valve core sleeve 610 are in sliding fit, and communication cavities 611 are provided on both the valve core seat 609 and the valve core sleeve 610. A reversing plate 508 is installed on the plug rod 505. During the lifting and lowering process of the plug rod 505, the reversing plate 508 respectively pushes the valve core sleeve 610 and the valve core seat 609 to move.

[0034] Specifically, a telescopic ball head is installed on the inner wall of the reversing pressure relief component 6, and ball grooves 612 are provided on both the valve core seat 609 and the valve core sleeve 610. The telescopic ball head is matched with the ball grooves 612.

[0035] Specifically, the reversing plate 508 includes a far pressure plate 5080 and a near pressure plate 5081. During the lifting and lowering process of the plug rod 505, the far pressure plate 5080 first pushes the valve core sleeve 610, and then the near pressure plate 5081 pushes the valve core seat 609.

[0036] It should be noted that one end of the collecting oil pipe 1 is connected to the pumping oil inlet pipe 4 through the connecting sleeve 3, and the other end of the collecting oil pipe 1 is connected to the oil fluid output pipe through the short oil pipe 2. When the hydraulic component 5 operates, the oil fluid inside the wellhead is transported from the pumping oil inlet pipe 4 into the connecting sleeve 3 and the collecting oil pipe 1, and then the collecting oil pipe 1 transports the oil fluid to the oil fluid output pipe on the ground. During the non-reversing process of the hydraulic component 5, the valve core sleeve 610 and the valve core seat 609 are flush.

[0037] During use, the hydraulic oil input pipe delivers hydraulic oil to the hydraulic component 5 in two paths. In the first path, the hydraulic oil input pipe delivers hydraulic oil to the bottom oil inlet 502 through oil port three 603 and oil port four 604. In the second path, the hydraulic oil input pipe delivers hydraulic oil to the top oil inlet 501 through oil port one 601 and oil port two 602.

[0038] The hydraulic oil output pipe discharges hydraulic oil from the inside of the hydraulic component 5 in two paths. In the first path, the hydraulic oil inside the hydraulic component 5 is discharged through the top oil drain port 503, oil port seven 607, and oil port eight 608. In the second path, the hydraulic oil inside the hydraulic component 5 is discharged through the bottom oil drain port 504, oil port five 605, and oil port six 606.

[0039] See Figure 7 and Figure 8 , at this time, oil port one 601 and oil port two 602 are blocked by the valve core seat 609, and oil port five 605 and oil port six 606 are blocked by the valve core sleeve 610, that is, the second path of the input hydraulic oil pipeline and the second path of the output hydraulic oil pipeline are blocked; oil port three 603 is connected to oil port four 604 through the communication cavity 611, and oil port seven 607 is connected to oil port eight 608 through the communication cavity 611, that is, the first path of the input hydraulic oil pipeline and the first path of the output hydraulic oil pipeline are connected; see Figure 6 , the hydraulic oil can only be input into the bottom oil inlet 502 through oil port three 603 and oil port four 604, and at the same time, the hydraulic oil can only be discharged through the top oil drain port 503, oil port seven 607, and oil port eight 608. In this state, the plug rod 505 drives the piston head 506 to lift.

[0040] When the piston head 506 moves to the top, the far pressure plate 5080 on the plug rod 505 first pushes the valve core sleeve 610 to move upward. As the valve core sleeve 610 moves upward, oil port five 605 and oil port six 606 are gradually connected, that is, the second path of the output hydraulic oil pipeline is connected. At this time, a part of the hydraulic oil inside the hydraulic component 5 can be discharged through the bottom oil drain port 504, oil port five 605, and oil port six 606. Before commutation, the pressure of the first path of the input hydraulic oil pipeline is effectively reduced, avoiding high-pressure impact of the hydraulic oil on the first path of the input hydraulic oil pipeline during commutation, and thus preventing damage to the first path of the input hydraulic oil pipeline; As the piston head 506 moves upward; the near pressure plate 5081 on the plug rod 505 then pushes the valve core seat 609 to move upward. As the valve core seat 609 moves upward, oil port one 601 and oil port two 602 are connected through the communication cavity 611, and oil port three 603 and oil port four 604 are blocked by the valve core seat 609, that is, the second path of the input hydraulic oil pipeline is connected, and the first path of the input hydraulic oil pipeline is blocked. The hydraulic oil enters the top oil inlet 501 through the second path of the input hydraulic oil pipeline. At this time, the hydraulic oil pushes the piston head 506 and the plug rod 505 to move downward, thereby realizing the commutation operation of the plug rod 505.

[0041] As the plug rod 505 moves downward, the far pressure plate 5080 and the near pressure plate 5081 disengage from the valve core sleeve 610 and the valve core seat 609. The valve core seat 609 and the valve core sleeve 610 are reset under the action of the return spring 615, and this process repeats. In the present invention, the automatic commutation of the plug rod 505 is achieved through the commutation plate 508, while avoiding the high-pressure impact of the hydraulic oil on the input hydraulic oil pipelines of the first and second circuits during the commutation process, which may cause pipeline damage.

[0042] It should be noted that the valve core seat 609 and the valve core sleeve 610 are realized by the cooperation of the ball grooves 612 with the telescopic ball heads on the inner wall of the commutation and pressure relief assembly 6, and the lifting and lowering processes of the valve core seat 609 and the valve core sleeve 610 are limited. Since the far pressure plate 5080 and the near pressure plate 5081 are arranged at different horizontal planes, after the far pressure plate 5080 and the near pressure plate 5081 respectively push the valve core sleeve 610 and the valve core seat 609 to complete the commutation operation, the return spring 615 can drive the valve core sleeve 610 to reset in time, and the ball groove 612 on the valve core sleeve 610 cooperates with the telescopic ball head.

[0043] See Figures 5-13 A vertical groove 614 is opened on the valve core seat 609, a slider 613 is installed on the valve core sleeve 610, the slider 613 is slidably matched with the vertical groove 614, and a return spring 615 is installed between the slider 613 and the inner wall of the vertical groove 614.

[0044] Specifically, an electromagnetic chuck 616 is installed on the vertical groove 614, and a magnetic metal sheet 617 is installed inside the slider 613, and the electromagnetic chuck 616 attracts the magnetic metal sheet 617.

[0045] Specifically, a roller 618 is installed inside the slider 613, the roller 618 fits against the outer wall of the plug rod 505, and the roller 618 is connected to the inner wall of the slider 613 through a compression spring 619.

[0046] Specifically, an inclined groove 620 is opened in the vertical groove 614, and the slider 613 is slidably matched with the inclined groove 620.

[0047] It should be noted that during the operation of the hydraulic component 5, see Figure 12 and Figure 13 , at this time, the roller 618 inside the slider 613 fits against the outer wall of the plug rod 505. The up and down movement of the plug rod 505 drives the roller 618 to roll, and the state of the plug rod 505 is judged by the rolling direction of the roller 618. Electromagnetic chucks 616 are installed at both the top and bottom of the vertical groove 614, and magnetic metal sheets 617 are built into both ends of the slider 613, and the electromagnetic chucks 616 attract the magnetic metal sheets 617 built into the slider 613.

[0048] During the process of the plug rod 505 lifting for oil production, see Figure 6, the hydraulic oil can only be input into the bottom oil inlet 502 through oil port three 603 and oil port four 604, and at the same time, the hydraulic oil can only be discharged through the top oil drain port 503, oil port seven 607 and oil port eight 608. See Figure 12 and Figure 13 , if the hydraulic component 5 suddenly stops, the top electromagnetic chuck 616 built in the vertical groove 614 is activated. The electromagnetic chuck 616 attracts the magnetic metal sheet 617 built in the slider 613, and then drives the slider 613 to move in the direction close to the electromagnetic chuck 616, so that the valve core sleeve 610 moves upward. As the valve core sleeve 610 moves upward, oil port five 605 and oil port six 606 are gradually connected, that is, the second-way output hydraulic oil pipeline is connected. At this time, the hydraulic oil inside the hydraulic component 5 can be discharged out through the bottom oil drain port 504, oil port five 605 and oil port six 606, relieving the pressure of the first-way input hydraulic oil pipeline, and avoiding the accumulation of the first-way input hydraulic oil pipeline caused by the sudden stop of the hydraulic component 5, resulting in damage to hydraulic components.

[0049] Specifically, as the slider 613 moves close to the electromagnetic chuck 616, under the sliding fit of the slider 613 and the inclined groove 620, the slider 613 gradually moves obliquely close to the plug rod 505. At this time, the roller 618 is pressed into the slider 613, so that the slider 613 presses against the outer wall of the plug rod 505, clamping and limiting the plug rod 505 by the slider 613, and avoiding the piston head 506 losing pressure and moving downward during the pressure relief process of the first-way input hydraulic oil pipe, so that the extracted oil is pushed into the wellhead interior under the action of the piston head 506.

[0050] After the hydraulic component 5 is started, the electromagnetic chuck 616 is closed. When the plug rod 505 moves downward, the hydraulic component 5 suddenly stops, and the same principle applies.

[0051] The implementation principle of the present invention is as follows: During use, the hydraulic oil input pipe conveys hydraulic oil into the hydraulic component 5 in two ways. The first way is that the hydraulic oil input pipe conveys hydraulic oil to the bottom oil inlet 502 through oil port three 603 and oil port four 604; the second way is that the hydraulic oil input pipe conveys hydraulic oil to the top oil inlet 501 through oil port one 601 and oil port two 602.

[0052] The hydraulic oil output pipe discharges hydraulic oil from the inside of the hydraulic component 5 in two ways. The first way is that the hydraulic oil inside the hydraulic component 5 is discharged through the top oil drain port 503, oil port seven 607 and oil port eight 608; the second way is that the hydraulic oil inside the hydraulic component 5 is discharged through the bottom oil drain port 504, oil port five 605 and oil port six 606.

[0053] See Figure 7 and Figure 8, at this time, the oil port one 601 and the oil port two 602 are blocked by the valve core seat 609, and the oil port five 605 and the oil port six 606 are blocked by the valve core sleeve 610, that is, the second input hydraulic oil pipeline and the second output hydraulic oil pipeline are blocked; the oil port three 603 is communicated with the oil port four 604 through the communication cavity 611, and the oil port seven 607 is communicated with the oil port eight 608 through the communication cavity 611, that is, the first input hydraulic oil pipeline and the first output hydraulic oil pipeline are communicated; see Figure 6 , the hydraulic oil can only enter the bottom oil inlet 502 through the oil port three 603 and the oil port four 604, and at the same time, the hydraulic oil can only be discharged through the top oil drain port 503, the oil port seven 607 and the oil port eight 608. In this state, the plug rod 505 drives the piston head 506 to lift.

[0054] When the piston head 506 moves to the top, the far pressure plate 5080 on the plug rod 505 first pushes the valve core sleeve 610 to move upward. As the valve core sleeve 610 moves upward, the oil port five 605 and the oil port six 606 are gradually communicated, that is, the second output hydraulic oil pipeline is communicated. At this time, a part of the hydraulic oil inside the hydraulic component 5 can be discharged outward through the bottom oil drain port 504, the oil port five 605 and the oil port six 606. Before commutation, the pressure of the first input hydraulic oil pipeline is effectively reduced, avoiding high-pressure impact of the hydraulic oil on the first input hydraulic oil pipeline during the commutation process, and further preventing damage to the first input hydraulic oil pipeline; As the piston head 506 moves upward; the near pressure plate 5081 on the plug rod 505 then pushes the valve core seat 609 to move upward. As the valve core seat 609 moves upward, the oil port one 601 and the oil port two 602 are communicated through the communication cavity 611, and the oil port three 603 and the oil port four 604 are blocked by the valve core seat 609, that is, the second input hydraulic oil pipeline is communicated, and the first input hydraulic oil pipeline is blocked. The hydraulic oil enters the top oil inlet 501 through the second input hydraulic oil pipeline. At this time, the hydraulic oil pushes the piston head 506 and the plug rod 505 to move downward, thereby realizing the commutation operation of the plug rod 505.

[0055] As the plug rod 505 moves downward, the far pressure plate 5080 and the near pressure plate 5081 are separated from the valve core sleeve 610 and the valve core seat 609. The valve core seat 609 and the valve core sleeve 610 are reset under the action of the return spring 615, and so on in turn. The present invention realizes the automatic commutation of the plug rod 505 through the commutation plate 508, and at the same time avoids high-pressure impact of the hydraulic oil on the first and second input hydraulic oil pipelines during the commutation process, resulting in pipeline damage.

[0056] During the process of the plug rod 505 lifting for oil production, see Figure 6 , the hydraulic oil can only enter the bottom oil inlet 502 through the oil port three 603 and the oil port four 604, and at the same time, the hydraulic oil can only be discharged through the top oil drain port 503, the oil port seven 607 and the oil port eight 608. See Figure 12 and Figure 13, if the hydraulic component 5 suddenly stops, the top electromagnetic chuck 616 built in the vertical groove 614 is activated. The electromagnetic chuck 616 attracts the magnetic metal sheet 617 built in the slider 613, and then drives the slider 613 to move in the direction close to the electromagnetic chuck 616, causing the valve core sleeve 610 to move upward. As the valve core sleeve 610 moves upward, the oil port five 605 and the oil port six 606 are gradually communicated, that is, the second-way output hydraulic oil pipeline is communicated. At this time, a part of the hydraulic oil inside the hydraulic component 5 can be discharged outward through the bottom oil discharge port 504, the oil port five 605 and the oil port six 606, relieving the pressure of the first-way input hydraulic oil pipeline, and avoiding the accumulation of the first-way input hydraulic oil pipeline caused by the sudden stop of the hydraulic component 5, resulting in damage to hydraulic components.

[0057] Specifically, as the slider 613 moves closer to the electromagnetic chuck 616, under the sliding fit of the slider 613 and the inclined groove 620, the slider 613 gradually moves obliquely closer to the plug rod 505. At this time, the roller 618 is pressed into the slider 613, causing the slider 613 to press against the outer wall of the plug rod 505, so that the slider 613 clamps and limits the plug rod 505, avoiding the piston head 506 losing pressure and moving downward during the pressure relief process of the first-way input hydraulic oil pipe, and causing the extracted oil to be pushed into the wellhead interior under the action of the piston head 506.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A hydraulic lifting oil production device without uneven wear, characterized in that: The invention comprises an oil collection pipe (1), a connecting sleeve (3) and a hydraulic assembly (5), wherein the oil collection pipe (1) is connected to an oil pumping inlet pipe (4) via the connecting sleeve (3), the oil collection pipe (1) is connected to an oil pumping outlet pipe via an oil pipe nipple (2), the connecting sleeve (3) is mounted with a hydraulic assembly (5), and the hydraulic assembly (5) comprises a plug rod (505), one end of the plug rod (505) is connected to a piston head (506), and the other end of the plug rod (505) is mounted with an oil pump; The hydraulic assembly (5) is mounted with a reversing pressure relief assembly (6), the hydraulic assembly (5) comprising a top oil inlet (501), a bottom oil inlet (502), a top oil discharge port (503) and a bottom oil discharge port (504), the reversing pressure relief assembly (6) comprising an oil port 1 (601), an oil port 2 (602), an oil port 3 (603), an oil port 4 (604), an oil port 5 (605), an oil port 6 (606), an oil port 7 (607), an oil port 7 (607) and an oil port 8 (608); The hydraulic oil input pipe is connected to the oil port one (601) and the oil port three (603) respectively, and the hydraulic oil is input into the top oil inlet (501) through the oil port one (601) and the oil port two (602), and is input into the bottom oil inlet (502) through the oil port three (603) and the oil port four (604); the hydraulic oil output pipe is connected to the oil port six (606) and the oil port eight (608) respectively, and the hydraulic oil at the top of the piston head (506) is discharged through the top oil discharge port (503), the oil port seven (607) and the oil port eight (608), and the hydraulic oil at the bottom of the piston head (506) is discharged through the bottom oil discharge port (504), the oil port five (605) and the oil port six (606); The reversing pressure relief assembly (6) further comprises a valve core seat (609) and a valve core sleeve (610) which are fitted on the outer wall of the plug rod (505); the valve core seat (609) and the valve core sleeve (610) are slidably matched, and a connecting cavity (611) is provided on the valve core seat (609) and the valve core sleeve (610); a reversing plate (508) is installed on the plug rod (505); during the process of the plug rod (505) being lifted and lowered, the reversing plate (508) respectively pushes the valve core sleeve (610) and the valve core seat (609) to move.

2. The wear-free hydraulic lifting oil production device according to claim 1, characterized in that: A telescopic ball head is installed on the inner wall of the reversing pressure relief assembly (6), and a ball groove (612) is provided on the valve core seat (609) and the valve core sleeve (610), and the telescopic ball head cooperates with the ball groove (612).

3. The wear-free hydraulic lifting oil production device according to claim 1, characterized in that: The reversing plate (508) comprises a distal pressure plate (5080) and a proximal pressure plate (5081). During the lifting and lowering process of the plug rod (505), the distal pressure plate (5080) first pushes the valve core sleeve (610), and then the proximal pressure plate (5081) pushes the valve core seat (609).

4. The non-biased wear hydraulic lifting oil production device according to claim 1, characterized in that: The valve core seat (609) is provided with a vertical groove (614), a slider (613) is installed on the valve core sleeve (610), the slider (613) and the vertical groove (614) are slidably matched, and a return spring (615) is installed between the slider (613) and the inner wall of the vertical groove (614).

5. The wear-free hydraulic lifting oil production device according to claim 4, characterized in that: An electromagnetic suction cup (616) is installed on the vertical groove (614), a magnetic metal sheet (617) is installed in the sliding block (613), and the electromagnetic suction cup (616) attracts the magnetic metal sheet (617).

6. The wear-free hydraulic lifting oil production device according to claim 5, characterized in that: A roller (618) is installed inside the slider (613), the roller (618) is in contact with the outer wall of the plug rod (505), and the roller (618) is connected to the inner wall of the slider (613) via a compression spring (619).

7. The wear-free hydraulic lifting oil production device according to claim 6, characterized in that: An oblique groove (620) is provided in the vertical groove (614), and the sliding block (613) is slidably engaged with the oblique groove (620).

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