Efficient lifting oil pumping device, oil pumping wellhead and using method

Abstract

The efficient lifting oil pumping device comprises a lifting mechanism and a well mouth sealing mechanism, the lifting mechanism is arranged at the upper end of the well mouth sealing mechanism, and the efficient lifting oil pumping device is characterized in that the well mouth sealing mechanism comprises a conversion pup joint and a rigid sealing piece; the rigid sealing piece is connected with a linear motion piece at the tail end of the lifting mechanism, and the rigid sealing piece is used for being connected with the upper end of a sucker rod; a soft seal is arranged at the upper end of the rigid sealing piece and used for being sealed with the lining. The upper end of the conversion pup joint is connected with a lifting mechanism, and a screw sealing device is arranged on the side wall of the conversion pup joint and used for temporarily sealing a rigid sealing piece and a lining and replacing a soft seal. A main abrasion part in the device is the second sealing part, the second sealing part can be replaced without stopping a well through the screw sealing device, and the service life of the device is long.

Description

Technical Field

[0001] This invention relates to the field of oil production equipment technology, specifically to a high-efficiency lifting pumping device, a wellhead, and a method of use. Background Technology

[0002] In oil extraction, the most common lifting method for oil wells is mechanical lift, with pumping units being the primary surface equipment. Commonly used pumping units are beam pumping units and beamless pumping units. These two types share similar basic energy transmission mechanisms, consisting of a motor, belt, reducer, and motion mechanism. The numerous intermediate transmission links result in low system efficiency and high energy consumption. Beam pumping units only offer 2-3 stroke lengths, which cannot meet the needs of stroke adjustment under different well conditions. With urban development, addressing the development contradiction of "potential underground but no available land above ground" in urban oilfields, cluster well development has emerged as a crucial approach for new area production and the adjustment of older areas. Cluster well groups have small well spacing, making on-site installation of beam and beamless pumping units inconvenient. Furthermore, during well workover operations, due to the close proximity of adjacent wells, for safety reasons, one well must be operated while another is shut down, impacting oilfield production.

[0003] Publication No.: CN116658127A discloses a voltage cylinder driven oil pump. The pump has a balance block fixed to the end of a crank, and two threaded rods are used to secure the balance block more firmly, facilitating later disassembly and assembly. This allows for changing the lifting stroke of the connecting beam end, and the connection position of the crank and connecting rod can be changed directly without stopping the equipment. Furthermore, the sliding block located in the middle of the threaded rods improves the connection reliability between the crank and the balance block, and can temporarily provide power to the reducer, thus ensuring normal oil pumping even if the first motor fails.

[0004] This patented technology solves the problem of normal operation of the pumping unit when the first motor fails. However, the pumping unit still has many power transmission links, resulting in low system efficiency. Furthermore, the existing technology requires the machine to be shut down when replacing easily damaged seals.

[0005] Publication No.: CN117514091A discloses a high-efficiency and energy-saving hydraulic pumping unit. After the hydraulic pumping unit completes a reversal, the internal energy stored in the rod-side or rodless-side accumulator is released to the hydraulic cylinder, thereby saving energy consumption in the hydraulic system. Furthermore, the hydraulic cylinder, in conjunction with a counterweight, can further reduce the energy consumption of the cylinder driving the sucker rod movement, further saving energy.

[0006] This patented technology uses hydraulic pressure to lift crude oil and has a hydraulic energy recovery system, which reduces energy consumption. However, the device is large in size and is not suitable for cluster well groups. Furthermore, this existing technology requires shutdown when replacing vulnerable seals.

[0007] Publication No.: CN117646615A, an intelligent walking beam pumping unit, first starts the permanent magnet motor, then the transmission wheel on the output shaft of the permanent magnet motor rotates, which in turn drives the other output shaft of the reduction gearbox to rotate, so that the crank rod eventually makes a circular motion, and the crank rod rotates more stably under the support of the counterweight. While the crank rod is making a circular motion, the connecting rod will pull the walking beam rod to make a continuous swinging motion on the support frame. That is, when the connecting rod pulls one end of the walking beam rod down, the end of the walking beam rod with the donkey head block will tilt up; when the connecting rod does not apply a pulling force to the walking beam rod, the donkey head block will fall under the action of gravity, so that the end of the walking beam rod with the donkey head block will tilt up and down. The donkey head block moves up and down once, which is one stroke, and then it can pull the polished rod to discharge the oil sucked by the pump body in the wellhead terminal.

[0008] This patented technology enables motor speed regulation to change the pumping unit's stroke rate, but it involves many intermediate steps, occupies a large area, and requires the machine to be stopped when replacing easily damaged seals.

[0009] Therefore, it is necessary to study a high-efficiency lifting pumping device to reduce intermediate transmission links, improve system efficiency, and facilitate intelligent control, enabling stepless adjustment of stroke and frequency. This will improve system efficiency, reduce oil well lifting energy consumption, and achieve green, low-carbon, energy-saving, and low-cost oilfield extraction. Summary of the Invention

[0010] In view of the above-mentioned defects in the existing technology, the purpose of this invention is to provide a high-efficiency lifting pumping device, a pumping wellhead, and a method of use.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] On one hand, the present invention provides a high-efficiency lifting pumping device, including a lifting mechanism and a wellhead sealing mechanism. The lifting mechanism is disposed at the upper end of the wellhead sealing mechanism. The wellhead sealing mechanism includes a conversion short joint and a rigid seal. The rigid seal is connected to the end linear motion component of the lifting mechanism and is used to connect to the upper end of the sucker rod. A soft seal is provided at the upper end of the rigid seal for sealing with the bushing. The upper end of the conversion short joint is connected to the lifting mechanism, and a screw sealing device is provided on the side wall of the conversion short joint for temporarily sealing the rigid seal and the bushing, and replacing the soft seal.

[0013] Furthermore, the soft seal includes a second sealing element, at least two of which are provided. The uppermost second sealing element is provided with a pressing device, and the second sealing element is provided with an opening for easy installation.

[0014] Furthermore, the conversion short circuit is provided with a universal connecting rod, the upper end of which is connected to the end linear motion component, and the lower end of which is connected to the rigid sealing component;

[0015] The switching short circuit is provided with an operation window for observing the inside of the switching short circuit;

[0016] The screw sealing device includes a blowout preventer and a locking rod. The locking rod passes through a conversion short connector and is threadedly connected to the conversion short connector. The blowout preventer is connected to the locking rod inside the conversion short connector. A first sealing element is provided on the inner and upper surfaces of the blowout preventer.

[0017] At least two screw sealing devices are provided. When all the screw sealing devices are assembled together, the center is a sealing hole, which can be sealed with a rigid sealing element.

[0018] Furthermore, the hoisting mechanism is connected to the wellhead electrical equipment;

[0019] The lifting mechanism includes an outer cylinder, a driving component is provided at the upper end of the outer cylinder, and a telescopic component is provided inside the outer cylinder. The driving component is connected to the telescopic component.

[0020] The drive assembly includes a motor and a reducer. The motor is connected to an electromagnetic brake and the reducer is also connected. The output of the reducer is a drive head.

[0021] The telescopic assembly includes a lead screw and a telescopic rod, which are disposed inside the outer cylinder. The lead screw is fixedly connected to the drive head.

[0022] The lead screw is fitted with a lead screw nut, and the outer wall of the lead screw nut is provided with an anti-rotation boss. The inner surface of the outer cylinder is provided with an axial long groove corresponding to the anti-rotation boss of the lead screw nut. The anti-rotation boss and the long groove cooperate to prevent the lead screw nut from rotating and only allow it to slide up and down. The lower end of the lead screw nut is fixedly connected to a telescopic rod, and the telescopic rod is a linear motion component at the end.

[0023] Position sensors for detecting the movement position of the lead screw nut are installed at both the upper and lower ends of the inner wall of the outer cylinder.

[0024] The lower end of the outer cylinder is provided with a connecting flange, and the lifting mechanism is connected to the wellhead sealing mechanism through the connecting flange. The connecting flange is provided with a guide and sealing device.

[0025] Furthermore, the telescopic assembly also includes a lubrication mechanism;

[0026] The lower end of the outer cylinder is provided with a lubricating oil outlet, which is connected to a lubricating oil pipeline. The lubricating oil pipeline is connected to a lubrication mechanism, which is installed on the outer cylinder wall. The lubrication mechanism is equipped with a lubricating oil circulation pump, a cooling device, and a nozzle, with the nozzle facing the lead screw.

[0027] Furthermore, the motor is provided with a protective shell, which is fixed to the connecting plate at the upper end of the outer cylinder, and a ventilation cover is provided at the upper end of the protective shell;

[0028] The motor is a dual-output shaft servo motor, including an upper output shaft and a lower output shaft. The upper output shaft is equipped with an electromagnetic brake, and the lower output shaft is inserted into a reducer.

[0029] Furthermore, the motor is connected to the wellhead electrical equipment;

[0030] The wellhead electrical equipment includes a control system, an inverter, and a rectifier. The grid power is supplied to the motor by the rectifier and inverter, and the control system controls the rotation of the motor.

[0031] The Inoue electrical equipment also includes an energy storage device and a braking resistor. The energy storage device stores the electricity generated by the motor driven by the lead screw, and the braking resistor can absorb peak electrical energy that cannot be recovered.

[0032] Secondly, the present invention provides a high-efficiency lifting pumping wellhead, comprising a tubing four-way, a casing four-way, and a casing connected in sequence, wherein a tubing is suspended and sealed inside the casing four-way. The invention is characterized by further comprising the high-efficiency lifting pumping device described in one aspect, wherein the lower end of the conversion short connector is connected to the tubing four-way, the lower end of the rigid seal is connected to the sucker rod, and the lower end of the sucker rod is connected to a plunger pump; a liner is suspended and sealed inside the tubing four-way, and the rigid seal seals the gap between the liner and the sucker rod.

[0033] Furthermore, the upper end of the liner corresponds to the sealing blowout preventer. After all the sealing blowout preventers are assembled, the first sealing element seals the tiny gap between the liner and the rigid sealing element. The length of the liner is greater than the maximum stroke length of the plunger pump.

[0034] Thirdly, the present invention provides a method for using a high-efficiency lifting pumping wellhead, characterized in that using the high-efficiency lifting pumping wellhead described in the second aspect includes the following steps:

[0035] Before starting work, replace the second seal of the soft seal and start the motor to drive the lead screw to move, so that the soft seal is lowered into the liner. Set the up and down reversing position of the lead screw on the control system.

[0036] During the downward movement, the sucker rod drives the telescopic rod downward, at which point the lead screw drives the motor to generate electricity in reverse.

[0037] During the upward movement, the motor reverses, driving the lead screw to move the lead screw nut and the lower connected sucker rod upward. The liquid above the plunger of the oil pump moves upward under the action of the oil pumping device. The soft seal and rigid seal seal the annular space between the liner and the sucker rod, preventing the liquid from flowing out through the liner. The liquid in the oil pipe can only flow out through the gap between the oil pipe and the liner, and through the channels on both sides of the four-way valve of the oil pipe, and enter the production process. During the upward movement, the energy storage device releases the stored electrical energy to power the motor.

[0038] When the machine stops, the electromagnetic brake locks the motor to prevent the lead screw from rotating; when the machine starts, the control system releases the electromagnetic brake and starts the motor synchronously.

[0039] When replacing the second seal of the soft seal, manually control the motor to move the soft seal to the position of the operating window, rotate the locking rods on both sides to drive the seal blowout preventer to seal the small gap between the rigid seal and the bushing. After replacing the second seal, the locking rod drives the seal blowout preventer to retract, and manually control the motor to move the soft seal into the bushing to complete the replacement of the second seal.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] 1. The entire system has fewer transmission links, higher operating efficiency, and an energy recovery device, making it more energy-efficient.

[0042] 2. The entire device is small in size and easy to install in wells with small well spacing.

[0043] 3. The device can operate automatically, making management more convenient.

[0044] 4. The stroke and frequency of the device are infinitely adjustable to adapt to the needs of different well conditions.

[0045] 5. The main wear part in the device is the second seal. The second seal can be replaced without stopping the well by using a screw sealing device, which gives the device a longer service life. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of a high-efficiency lifting oil pumping device according to the present invention;

[0047] Figure 2 This is a schematic diagram of the lifting mechanism in this invention;

[0048] Figure 3 This is a schematic diagram of the structure of the lead screw nut of the lifting mechanism in this invention;

[0049] Figure 4 This is a schematic diagram of the wellhead sealing mechanism in this invention.

[0050] In the diagram: 1-Lifting mechanism; 1.1-Electromagnetic brake; 1.2-Motor; 1.3-Reducer; 1.4-Lead screw; 1.5-Lead screw nut; 1.6-Outer cylinder; 1.7-Telescopic rod; 1.8-Guide and sealing device; 1.9-Connecting flange; 1.10-Lubricating oil line; 1.11-Lubrication mechanism; 1.12-Bearing housing; 1.13-Bearing; 1.14-Bearing cover; 1.15-Drive head; 1.16-Protective shell; 1.17-Connecting rod; 1.18-Ventilation hood;

[0051] 2-Wellhead sealing mechanism; 2.1-Converter short connector; 2.2-Tubing four-way connector; 2.3-Casing four-way connector; 2.4-Universal connector; 2.5-Soft seal; 2.6-Blowout preventer seat; 2.7-Locking rod; 2.8-Rigid seal; 2.9-Shell liner suspension seal; 2.10-Tubing suspension seal; 2.11-Sucker rod; 2.12-Shell liner; 2.13-Tubing; 2.14-Operating window;

[0052] 3-Bushing; 4-Control system; 5-Inverter; 6-Energy storage device; 7-Binding resistor; 8-Other electrical equipment; 9-Rectifier; 10-Power grid. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Example 1:

[0055] Please see Figures 1 to 4 The present invention provides a high-efficiency lifting pumping device, including a lifting mechanism 1 and a wellhead sealing mechanism 2. The lifting mechanism 1 is disposed on the upper end of the wellhead sealing mechanism 2, the wellhead sealing mechanism 2 is used to connect to the wellhead, and the lifting mechanism 1 is connected to the electrical equipment on the well.

[0056] The lifting mechanism 1 includes an outer cylinder 1.6, a driving component is provided at the upper end of the outer cylinder 1.6, and a telescopic component is provided inside the outer cylinder 1.6. The driving component is connected to the telescopic component.

[0057] The drive assembly includes a motor 1.2, which is equipped with an electromagnetic brake 1.1 to lock the rotor of the motor 1.2. The output end of the motor 1.2 is connected to a reducer 1.3 by bolts. The output hole of the reducer 1.3 is connected to the drive head 1.15 by a key. The upper end of the outer cylinder 1.6 is provided with a bearing seat 1.12, and a bearing 1.13 is provided in the bearing seat 1.12. The drive head 1.15 is fixedly connected to the inner wall of the bearing 1.13. The lower end of the drive head 1.15 is fixedly connected to the telescopic assembly. The upper end of the outer cylinder 1.6 is provided with a mounting plate, and the reducer 1.3, the bearing seat 1.12 and the mounting plate are fixedly connected.

[0058] The motor 1.2 is externally equipped with a protective shell 1.16, which is fixed to the connecting plate at the upper end of the outer cylinder 1.6 by bolts or other means. A ventilation hood 1.18 is provided at the upper end of the protective shell 1.16, and the ventilation hood 1.18 is connected to the protective shell 1.16 by connecting rods 1.17. Multiple connecting rods 1.17 are provided as needed. There is a gap between the inner wall of the ventilation hood 1.18 and the outer wall of the protective shell 1.16 to allow ventilation and heat dissipation between the external environment and the components inside the protective shell 1.16, while also preventing rainwater erosion.

[0059] Among them, motor 1.2 is the lifting power of the oil pumping device. Motor 1.2 is a dual-output shaft servo motor, including an upper output shaft and a lower output shaft. The electromagnetic brake 1.1 is set on the upper end of motor 1.2 and can lock the upper output shaft. The lower output shaft is inserted into reducer 1.3. The housing of reducer 1.3 is fixedly connected to the housing of motor 1.2 by bolts. The reducer 1.3 and bearing seat 1.12 are bolted to the mounting plate of outer cylinder 1.6.

[0060] The bearing 1.13 is a thrust bearing or other type of bearing capable of withstanding axial force. The bearing 1.13 is mounted on the bearing housing 1.12 via a bearing cover 1.14, and the bearing cover 1.14 and the bearing housing 1.12 are connected by bolts.

[0061] The telescopic assembly includes a lead screw 1.4, a telescopic rod 1.7, and a lubrication mechanism 1.11. The lead screw 1.4 and the telescopic rod 1.7 are disposed inside the outer cylinder 1.6. The lead screw 1.4 is fixedly connected to the drive head 1.15. A lead screw nut 1.5 is fitted onto the lead screw 1.4. The outer wall of the lead screw nut 1.5 is provided with an anti-rotation boss. At least two anti-rotation bosses are provided and are evenly distributed circumferentially. The inner surface of the outer cylinder 1.6 is provided with an axial long groove corresponding to the anti-rotation boss of the lead screw nut 1.5. The anti-rotation boss and the long groove cooperate to prevent the lead screw nut 1.5 from rotating and allow it to slide up and down. The lower end of the lead screw nut 1.5 is fixedly connected to the telescopic rod 1.7. The upper and lower ends of the inner wall of the outer cylinder 1.6 are provided with... A position sensor is installed to detect the movement position of the lead screw nut 1.5. The space between the outer cylinder 1.6 and the telescopic rod 1.7 is filled with an appropriate amount of lubricating oil. The lower end of the outer cylinder 1.6 is provided with a lubricating oil outlet, which is connected to a lubricating oil pipeline 1.10. The lubricating oil pipeline 1.10 is connected to a lubrication mechanism 1.11, which is located on the wall of the outer cylinder 1.6. The lubrication mechanism 1.11 is equipped with a lubricating oil circulation pump, a cooling device, and a nozzle. The nozzle faces the lead screw 1.4. The lower end of the outer cylinder 1.6 is provided with a connecting flange 1.9. The lifting mechanism 1 is connected to the wellhead sealing mechanism 2 through the connecting flange 1.9. The connecting flange 1.9 is provided with a guide and sealing device 1.8.

[0062] The drive head 1.15 is connected to the lead screw 1.4 by threads or other connection methods, and has anti-loosening measures.

[0063] Among them, lead screw 1.4 is a ball screw or planetary roller screw, etc.

[0064] The lubrication mechanism 1.11 lifts the lubricating oil from the bottom of the outer cylinder 1.6 to the top of the outer cylinder 1.6 through the lubricating oil pipeline 1.10, and sprays it onto the lead screw 1.4 when the lead screw 1.4 moves, thus playing a role in lubrication and cooling.

[0065] The telescopic rod 1.7 and the lead screw nut 1.5 can be designed and manufactured as a single unit, or they can be connected by threads or other means.

[0066] Among them, the guiding and sealing device 1.8 can seal the telescopic rod 1.7 and at the same time guide the operation of the telescopic rod.

[0067] Specifically, in this embodiment, the lead screw nut 1.5 is designed with two anti-rotation bosses, which are symmetrically distributed. Multiple sets of anti-rotation bosses can be set as needed.

[0068] The wellhead sealing mechanism 2 includes a conversion short connector 2.1, the upper end of which is connected to the lifting mechanism 1. A universal connecting rod 2.4 is installed inside the conversion short connector 2.1, the upper end of which is connected to a telescopic rod 1.8. The universal connecting rod 2.4 is connected to the sucker rod 2.11 via a rigid seal 2.8. An operating window 2.14 is provided on the conversion short connector 2.1. A screw sealing device is provided on the side wall of the conversion short connector 2.1, the screw sealing device including a blowout preventer 2.6 and a locking rod 2.7, the locking rod 2.7 passing through the conversion short connector 2. 1. The locking rod 2.7 is threadedly connected to the conversion short connector 2.1. The sealing blowout preventer 2.6 is connected to the locking rod 2.7 inside the conversion short connector 2.1. The inner and upper surfaces of the sealing blowout preventer 2.6 are provided with a first sealing element. At least two screw sealing devices are provided. After all the sealing blowout preventers 2.6 of the screw sealing devices are assembled together, the center is a sealing hole. The sealing hole can seal with the rigid sealing element 2.8. The rigid sealing element 2.8 is provided at the upper end of the sucker rod 2.11. The sucker rod 2.11 is connected to the universal connecting rod 2.4 through the rigid sealing element 2.8.

[0069] Among them, the universal connecting rod 2.4 allows the telescopic rod 1.8 to be connected to the sucker rod 2.11 even when they are not on the same axis, reducing the difficulty of connection.

[0070] Two operation windows 2.14 are symmetrically arranged. The sealing element of the soft seal 2.5 can be replaced through the operation windows 2.14. The size of the operation windows 2.14 is convenient for the replacement of the sealing element of the soft seal 2.5, and does not affect the strength of the conversion short circuit 2.1.

[0071] Among them, the locking rod 2.7 is a screw structure, which can lock in any position. The sealing blowout seat 2.6 can move relative to each other under the drive of the locking rod 2.7. The combination of all the sealing blowout seats 2.6 can clamp and seal the rigid seal 2.8.

[0072] The wellhead electrical equipment includes a control system 4, an inverter 5, and a rectifier 9. The power from the power grid 10 is rectified by the rectifier 8 to form a DC bus grid. The power from the DC bus grid is inverted by the inverter 5 to provide power to the motor 1.2. The rotation of the motor 1.2 is controlled by the control system 4.

[0073] The DC bus grid is equipped with an energy storage device 6, a braking resistor 7, and other electrical equipment 8. The energy storage device 6 can store the electricity generated by the downward drive of the lead screw 1.4 driving the motor 1.2, and release the electricity when the oil pumping device moves upward or supply it to other electrical equipment 8. The braking resistor 7 can absorb the peak power generation that the energy storage device 6 cannot absorb when the lead screw 1.4 drives the motor 1.2 to generate electricity, ensuring the stable operation of the system. The other electrical equipment 8 are other types of electrical equipment in the DC grid.

[0074] The motor 1.2 drives the lead screw 1.4, which causes the telescopic rod 1.7 to move up or down, thereby driving the sucker rod 2.11 to move and driving the oil pump to perform oil extraction.

[0075] The oil pump is a plunger pump.

[0076] Example 2:

[0077] Based on Example 1, this example provides a high-efficiency lifting pumping wellhead. The lower end of the conversion short connector 2.1 is connected to the tubing four-way connector 2.2, the lower end of the tubing four-way connector 2.2 is connected to the casing four-way connector 2.3, the tubing four-way connector 2.2 is connected to the casing four-way connector 2.3 through a flange, the lower end of the casing four-way connector 2.3 is connected to the bottom flange, and the bottom flange is connected to the casing 3.

[0078] The upper end of the inner wall of the oil pipe cross 2.2 is provided with a liner suspension seal 2.9, which seals the inner wall of the oil pipe cross 2.2. The liner suspension seal 2.9 is connected to the liner 2.12 by threads.

[0079] An oil pipe suspension seal 2.10 is provided on the upper end of the inner wall of the casing four-way 2.3. The oil pipe suspension seal 2.10 seals the inner wall of the casing four-way 2.3. The oil pipe suspension seal 2.10 is connected to the oil pipe 2.13 by threads. The lower end of the oil pipe 2.13 is connected to the oil pump.

[0080] The liner 2.12 is placed inside the tubing 2.13. The tubing 2.13 and the oil pump are both placed inside the casing 3. The sucker rod 2.11 is connected to the oil pump. A soft seal 2.5 is provided at the upper end of the rigid seal 2.8. The soft seal 2.5 can seal the annular space between the sucker rod 2.11 and the liner 2.12. The soft seal 2.5 includes a second seal. Multiple sets of second seals can be provided. A clamping device is provided on the upper part of the uppermost second seal.

[0081] Among them, the conversion short-circuit 2.1 is connected to the oil pipe four-way 2.2, and the oil pipe four-way 2.2 is connected to the casing four-way 2.3 through flanges.

[0082] The rigid seal 2.8 and the liner 2.12 are fitted with a clearance, and the annular space between the sucker rod 2.11 and the liner 2.12 is sealed by the outer wall of the soft seal 2.5 on the rigid seal 2.8 and the inner wall of the liner 2.12.

[0083] The upper end of the liner 2.12 corresponds to the sealing blowout preventer 2.6. After all the sealing blowout preventers 2.6 are assembled, the first seal seals the tiny gap between the liner 2.12 and the rigid seal 2.8. The length of the liner 2.12 is greater than the maximum stroke length of the pumping unit during production. The first seal is provided with a stepped sealing surface or achieves the seal between the rigid seal 2.8 and the bushing 2.12 through its own deformation ability. The first seal is made of rubber.

[0084] When replacing the second seal of the soft seal 2.5, the blowout preventer 2.6 seals the small gap between the rigid seal 2.8 and the bushing 2.12 to ensure wellhead safety during the replacement of the second seal of the soft seal 2.5. Preferably, to facilitate seal installation, the second seal can be configured as an open type, such as an open rubber ring.

[0085] There are gaps between casing 3 and tubing 2.13, and between tubing 2.13 and liner 2.12. The gap between tubing 2.13 and liner 2.12 is the production oil flow channel for crude oil. Crude oil flows out through the gap between tubing 2.13 and liner 2.12 and the channels on both sides of tubing cross 2.2.

[0086] Example 3:

[0087] Based on Example 2, this example provides a method for using a high-efficiency lifting pumping wellhead, specifically including the following steps:

[0088] Before starting work, replace the second seal of the soft seal 2.5 and start the motor 1.2 to drive the lead screw 1.4 to move, so that the soft seal 2.5 is lowered into the liner 2.12. Set the up and down reversing position of the lead screw 1.4 on the control system 4.

[0089] During the downward movement, under the influence of the gravity of the liquid column and the gravity of the sucker rod, the sucker rod 2.11 drives the telescopic rod 1.7 to move downward. At this time, the lead screw 1.4 drives the motor 1.2 to generate electricity. The generated electricity enters the DC bus grid through the inverter 5 and can supply power to other electrical equipment 8. Excess energy is stored in the energy storage device 6, and peak electrical energy is consumed by the braking resistor 7, thereby ensuring the stable operation of the lead screw 1.4.

[0090] During the upward movement, motor 1.2 reverses, driving screw 1.4 to move screw nut 1.5 and the lower connected sucker rod 2.11 upward. The liquid above the pump plunger moves upward under the action of the pumping device. The soft seal 2.5 and rigid seal 2.8 seal the annular space between the liner 2.12 and the sucker rod 2.11, preventing the liquid from flowing out through the liner 2.12. The liquid in the oil pipe 2.13 can only flow out through the gap between the oil pipe 2.13 and the liner 2.12, and through the channels on both sides of the oil pipe four-way 2.2, entering the production process. During the upward movement, the energy storage device 6 releases the stored electrical energy to power motor 1.2, thereby reducing the operating energy consumption of the equipment.

[0091] During operation, the distance of the telescopic rod 1.7 moving up and down is set by the encoder or other displacement detection device configured on the motor 1.2. When it reaches the reversing point, it turns to move in the opposite direction. Under the control system 4, parameters such as the up and down speed and the up and down distance can be adjusted, thereby changing the production parameters such as the stroke, stroke rate, and stroke speed of the device. The position sensors set at the upper and lower ends of the outer cylinder 1.6 are safety limit measures for the equipment. Under any circumstances, the screw nut 1.5 can reverse or stop moving when it reaches the position detection points at the upper and lower ends, ensuring the safe operation of the equipment. In addition to controlling the operation of the screw 1.4, the control system 4 also controls the storage and release of electrical energy in the energy storage device 6 and the operation of the braking resistor 7. While the screw 1.4 is running, the lubrication mechanism 1.11 operates synchronously. Lubricating oil is sprayed onto the screw under the action of the lubrication mechanism 1.11, which plays a role in lubrication and cooling. The heat generated by the motor 1.2 during operation is exchanged through the gap between the inner wall of the ventilation hood 1.18 and the outer wall of the protective shell 1.16, ensuring the stable operation of the motor 1.2.

[0092] When the machine stops, the electromagnetic brake 1.1 locks the motor, thereby preventing the lead screw 1.4 from rotating; when the machine starts, the control system 4 controls the electromagnetic brake 1.1 to release and synchronously start the motor 1.2.

[0093] When replacing the second seal of the soft seal 2.5, manually control the motor 1.2 to move the soft seal 2.5 upward to the position of the operating window 2.14, rotate the locking rods 2.7 on both sides to drive the sealing blowout preventer 2.6 to seal the small gap between the rigid seal 2.8 and the bushing 2.12. After replacing the second seal, the locking rod 2.7 drives the sealing blowout preventer 2.6 to retract, and manually control the motor 1.2 to move the soft seal 2.5 into the bushing 2.12 to complete the replacement of the second seal.

[0094] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0095] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0096] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0097] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-efficiency lifting pumping device, comprising a lifting mechanism and a wellhead sealing mechanism, wherein the lifting mechanism is disposed at the upper end of the wellhead sealing mechanism, characterized in that, The wellhead sealing mechanism includes a conversion short circuit and a rigid sealing element; The rigid seal is connected to the end linear motion component of the lifting mechanism, and the rigid seal is used to connect to the upper end of the sucker rod. The rigid seal is provided with a soft seal at its upper end for sealing with the bushing; The upper end of the conversion short connector is connected to the lifting mechanism, and the side wall of the conversion short connector is provided with a screw sealing device for temporarily sealing the rigid seal and bushing, and replacing the soft seal.

2. The high-efficiency lifting oil pumping device according to claim 1, characterized in that, The soft seal includes a second sealing element, and at least two second sealing elements are provided. The uppermost second sealing element is provided with a pressing device, and the second sealing element is provided with an opening for easy installation.

3. The high-efficiency lifting pumping device according to claim 2, characterized in that, The conversion short circuit is provided with a universal connecting rod. The upper end of the universal connecting rod is connected to the end linear motion component, and the lower end of the universal connecting rod is connected to the rigid sealing component. The switching short circuit is provided with an operation window for observing the inside of the switching short circuit; The screw sealing device includes a blowout preventer and a locking rod. The locking rod passes through a conversion short connector and is threadedly connected to the conversion short connector. The blowout preventer is connected to the locking rod inside the conversion short connector. A first sealing element is provided on the inner and upper surfaces of the blowout preventer. At least two screw sealing devices are provided. When all the screw sealing devices are assembled together, the center is a sealing hole, which can be sealed with a rigid sealing element.

4. The high-efficiency lifting oil pumping device according to claim 3, characterized in that, The lifting mechanism is connected to the wellhead electrical equipment; The lifting mechanism includes an outer cylinder, a driving component is provided at the upper end of the outer cylinder, and a telescopic component is provided inside the outer cylinder. The driving component is connected to the telescopic component. The drive assembly includes a motor and a reducer. The motor is connected to an electromagnetic brake and the reducer is also connected. The output of the reducer is a drive head. The telescopic assembly includes a lead screw and a telescopic rod, which are disposed inside the outer cylinder. The lead screw is fixedly connected to the drive head. The lead screw is fitted with a lead screw nut, and the outer wall of the lead screw nut is provided with an anti-rotation boss. The inner surface of the outer cylinder is provided with an axial long groove corresponding to the anti-rotation boss of the lead screw nut. The anti-rotation boss and the long groove cooperate to prevent the lead screw nut from rotating and only allow it to slide up and down. The lower end of the lead screw nut is fixedly connected to a telescopic rod, and the telescopic rod is a linear motion component at the end. Position sensors for detecting the movement position of the lead screw nut are installed at both the upper and lower ends of the inner wall of the outer cylinder. The lower end of the outer cylinder is provided with a connecting flange, and the lifting mechanism is connected to the wellhead sealing mechanism through the connecting flange. The connecting flange is provided with a guide and sealing device.

5. The high-efficiency lifting pumping device according to claim 4, characterized in that, The telescopic assembly also includes a lubrication mechanism; The lower end of the outer cylinder is provided with a lubricating oil outlet, which is connected to a lubricating oil pipeline. The lubricating oil pipeline is connected to a lubrication mechanism, which is installed on the outer cylinder wall. The lubrication mechanism is equipped with a lubricating oil circulation pump, a cooling device, and a nozzle, with the nozzle facing the lead screw.

6. The high-efficiency lifting pumping device according to claim 4, characterized in that, The motor is provided with a protective shell, which is fixed to the connecting plate at the upper end of the outer cylinder. A ventilation cover is provided at the upper end of the protective shell. The motor is a dual-output shaft servo motor, including an upper output shaft and a lower output shaft. The upper output shaft is equipped with an electromagnetic brake, and the lower output shaft is inserted into a reducer.

7. The high-efficiency lifting pumping device according to claim 4, characterized in that, The motor is connected to the wellhead electrical equipment; The wellhead electrical equipment includes a control system, an inverter, and a rectifier. The grid power is supplied to the motor by the rectifier and inverter, and the control system controls the rotation of the motor. The Inoue electrical equipment also includes an energy storage device and a braking resistor. The energy storage device stores the electricity generated by the motor driven by the lead screw, and the braking resistor can absorb peak electrical energy that cannot be recovered.

8. A high-efficiency lifting pumping wellhead, comprising a tubing four-way, a casing four-way, and a casing connected in sequence, wherein the casing four-way contains a tubing suspended and sealed inside, characterized in that, It also includes a high-efficiency lifting and pumping device as described in claim 7, wherein the lower end of the conversion short connector is connected to the fourth oil pipe, the lower end of the rigid seal is connected to the sucker rod, and the lower end of the sucker rod is connected to the plunger pump. The tubing tee is internally suspended and sealed with a liner, and the rigid seal seals the gap between the liner and the sucker rod.

9. The high-efficiency lifting pumping wellhead according to claim 8, characterized in that, The upper end of the liner corresponds to the sealing blowout preventer. After all the sealing blowout preventers are assembled, the first sealing element seals the tiny gap between the liner and the rigid sealing element. The length of the liner is greater than the maximum stroke length of the plunger pump.

10. A method for using a high-efficiency lifting pumping wellhead, characterized in that, Using the efficient lifting pumping wellhead as described in claim 9 includes the following steps: Before starting work, replace the second seal of the soft seal and start the motor to drive the lead screw to move, so that the soft seal is lowered into the liner. Set the up and down reversing position of the lead screw on the control system. During the downward movement, the sucker rod drives the telescopic rod downward, at which point the lead screw drives the motor to generate electricity in reverse. During the upward movement, the motor reverses, driving the lead screw to move the lead screw nut and the lower connected sucker rod upward. The liquid above the plunger of the oil pump moves upward under the action of the oil pumping device. The soft seal and rigid seal seal the annular space between the liner and the sucker rod, preventing the liquid from flowing out through the liner. The liquid in the oil pipe can only flow out through the gap between the oil pipe and the liner, and through the channels on both sides of the four-way valve of the oil pipe, and enter the production process. During the upward movement, the energy storage device releases the stored electrical energy to power the motor. When the machine stops, the electromagnetic brake locks the motor to prevent the lead screw from rotating; when the machine starts, the control system releases the electromagnetic brake and starts the motor synchronously.

11. The method for using a high-efficiency lifting pumping wellhead according to claim 10, characterized in that, When replacing the second seal of the soft seal, manually control the motor to move the soft seal to the position of the operating window, rotate the locking rods on both sides to drive the seal blowout preventer to seal the small gap between the rigid seal and the bushing. After replacing the second seal, the locking rod drives the seal blowout preventer to retract, and manually control the motor to move the soft seal into the bushing to complete the replacement of the second seal.

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