Oil extraction wellhead device capable of automatically adjusting flow

Abstract

The invention relates to the technical field of oil production wellhead devices, and discloses an oil production wellhead device capable of automatically adjusting flow, which comprises a casing head, a tubing head, a Christmas tree and a controller which are sequentially mounted at the top of a wellhead, the Christmas tree comprises an adjustable throttle valve, the adjustable throttle valve comprises a valve body and a valve cover, a valve seat is mounted in the valve body, and the valve cover is mounted on the valve seat. A sealing filler is installed in the valve body, a valve rod is slidably connected to the interior of the valve deck, a valve element is fixedly connected to the bottom of the valve rod, an annular groove is formed in the middle of the sealing filler, a liposuction sponge sleeve is arranged in the annular groove, L-shaped grease adding pipes are symmetrically arranged on the outer portion of the liposuction sponge sleeve, and a grease adding mechanism is arranged in the valve deck. When the valve rod linearly moves up and down to change the opening degree between the valve element and the valve seat, the annular piston can move downwards to extrude lubricating grease in the annular grease storage cavity to achieve self-lubrication of the valve rod, and therefore dynamic friction between the valve rod and sealing filler can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production wellhead devices, in particular to an oil production wellhead device with automatic flow regulation. Background Art

[0002] The oil wellhead assembly is a series of devices installed at the wellhead during the oil production process. It controls and manages the flow of fluids (including crude oil, natural gas, and associated water) from underground to the surface, and is crucial for ensuring safe and efficient oil production. The oil wellhead assembly primarily consists of components such as the casing head, tubing head, and Christmas tree. The casing head primarily supports the tubing head and Christmas tree, the tubing head primarily suspends the tubing, and the Christmas tree primarily controls reservoir pressure and regulates oil flow. Each component is connected using a sealed structure to ensure safe and reliable oil production operations.

[0003] A search revealed Chinese invention patent publication number CN 101644149 A, which discloses an integrated horizontal oil production wellhead assembly. The assembly consists of a wellhead body, a tubing hanger, a pneumatic-hydraulic safety valve, a throttle valve, a flat valve, a WD casing hanger slip housing, reverse slips, positive slips, a sealing baffle, double C-rings, a BT seal, a plug, an intermediate casing hanger, a completion casing hanger, a steel ring, a reducing flange, a wax removal valve, and a Christmas tree cap. The wellhead body is cylindrical and contains an upper cavity, a middle cavity, and a lower cavity. Compared to existing technologies, this patent, publication number CN 101644149 A, utilizes a three-hook integrated suspension structure, which reduces the wellhead height and simplifies the installation process. Subsequent workover operations do not require the removal of the production tree and associated connecting pipelines, simplifying subsequent workover operations.

[0004] During the oil production process of the above-mentioned integrated horizontal oil production wellhead device, the throttle valve included in the oil production tree valve body can automatically adjust the oil output flow rate according to downhole conditions or production needs. However, when the valve core position in the throttle valve is adjusted, dynamic friction will be generated between the valve stem and the sealing packing. That is, frequent adjustment of the valve core position will lead to increased wear between the valve stem and the sealing packing, thereby increasing the risk of leakage in the device. Therefore, there is a need for an oil production wellhead device that can reduce dynamic friction (between the valve stem and the sealing packing) and automatically adjust the flow rate. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantage in the prior art that frequent adjustment of the valve core position will lead to increased wear between the valve stem and the sealing packing, and to propose an oil wellhead device with automatic flow adjustment.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: 1. The oil production wellhead device of claim 1 , wherein the oil production wellhead device comprises a casing head, a tubing head, a Christmas tree, and a controller connected to the Christmas tree, the Christmas tree comprising an adjustable throttle valve for automatically regulating the oil production flow rate. The adjustable throttle valve comprises a valve body for encapsulation and a valve cover mounted on the top thereof. An oil inlet pipe and an oil outlet pipe are fixedly connected to the side and bottom of the valve body, respectively. A sensor group is mounted inside the oil inlet pipe. A valve seat extending to the upper inner portion of the oil outlet pipe is mounted inside the valve body. A sealing packing close to the valve cover is mounted inside the valve body. A valve stem passing through the sealing packing and extending into the interior of the valve body is slidably connected to the interior of the valve cover. A valve core for sealing the valve seat is fixedly connected to the bottom of the valve stem. An actuator for causing the valve stem to perform linear motion is disposed on the outside of the valve body. An annular groove is provided in the middle of the sealing packing, and a liposuction sponge sleeve is provided inside the annular groove and is sleeved on the outside of the valve stem. An L-shaped grease adding tube extending to the top of the sealing packing is axially symmetrically provided on the outside of the liposuction sponge sleeve. A grease adding mechanism for adding grease to the inside of the axially symmetrical L-shaped grease adding tube is provided inside the valve cover, and a linkage mechanism that is linked to the actuator and the grease adding mechanism is provided on the top of the valve cover.

[0007] The above technical solution further includes: The sensor group is connected to the controller and is used to monitor the flow rate, pressure and temperature inside the oil inlet pipe. The controller calculates based on a preset algorithm and issues instructions to the actuator; the flow rate, pressure and temperature data inside the oil inlet pipe are the basis for achieving automatic regulation of oil production flow.

[0008] The actuator includes a sealed bearing mounted on the top of the valve cover and an actuator motor mounted on the top of the valve cover via a mounting bracket, wherein the input end of the actuator motor is connected to the controller, and the output end of the actuator motor is fixedly connected to a rotating threaded rod passing through the sealed bearing; The actuator further includes two vertical slide grooves provided inside the valve cover, wherein the interiors of the two vertical slide grooves are slidably connected to sliders fixedly connected to the valve stem, and the interior of the valve stem is provided with a cylindrical groove extending to the top thereof, wherein the interior of the cylindrical groove is fixedly connected to an internal threaded sleeve threadedly connected to the exterior of the rotating threaded rod; The execution motor starts to drive the rotating threaded rod to rotate, so that the internal threaded sleeve drives the valve stem to move up and down to change the opening between the valve core and the valve seat. The linear motion of the valve stem to adjust the valve core opening can reduce the dynamic friction between the valve stem and the sealing packing.

[0009] The grease adding mechanism includes an annular grease storage chamber opened inside the valve cover, a grease injection tube extending to the outside of the valve cover is provided on the outside of the annular grease storage chamber, the bottom of the annular grease storage chamber is axially symmetrically fixedly connected to a conical grease adding tube that can be inserted into the inside of the L-shaped grease adding tube, an annular piston is provided inside the annular grease storage chamber, the top of the annular piston is axially symmetrically fixedly connected to a connecting rod passing through the valve cover, and the tops of the axially symmetrical connecting rods are jointly fixedly connected to a connecting ring; when the connecting ring drives the annular piston to move downward through the axially symmetrical connecting rod, the grease inside the annular grease storage chamber can be squeezed into the inside of the conical grease adding tube and the L-shaped grease adding tube.

[0010] The linkage mechanism includes an inverted U-shaped air pressure tube and a positive U-shaped air pressure tube symmetrically fixedly connected to the top of the valve cover, an annular air pressure tube is fixedly connected between the middle of the symmetrical inverted U-shaped air pressure tube and the top of the symmetrical positive U-shaped air pressure tube, two one-way valves A close to the corresponding inverted U-shaped air pressure tubes are symmetrically installed on the outside of the annular air pressure tube, and a one-way valve B close to the annular air pressure tube is installed on the outside of the symmetrical inverted U-shaped air pressure tube. A piston connecting rod passing through the valve cover is provided inside one end of the symmetrical inverted U-shaped air pressure tube. The two The piston connecting rods are respectively fixedly connected to the tops of the two sliders, and the other ends of the symmetrical inverted U-shaped air pressure tubes are internally provided with piston telescopic rods A fixedly connected to the top of the connecting ring, and the ends of the symmetrical positive U-shaped air pressure tubes away from the annular air pressure tubes are internally provided with piston telescopic rods B fixedly connected to the bottom of the connecting ring; when the valve stem moves up and down to change the opening between the valve core and the valve seat, the piston connecting rod can be used to pressurize the gas inside the inverted U-shaped air pressure tube and to decompress the gas inside the annular air pressure tube and the positive U-shaped air pressure tube.

[0011] The relative one-way valves A are used to allow the airflow inside the annular air pressure tube to pass in a direction close to each other, and the one-way valves B are used to allow the airflow inside the corresponding inverted U-shaped air pressure tube to pass upward; the gas below the inside of the inverted U-shaped air pressure tube can pass through the obstruction of the relative one-way valve A and pass through the one-way valve B to enter the upper part of the inside of the inverted U-shaped air pressure tube, and the gas inside the annular air pressure tube and the positive U-shaped air pressure tube can pass through the obstruction of the one-way valve B and pass through the relative one-way valve A to enter the lower part of the inside of the inverted U-shaped air pressure tube.

[0012] The piston telescopic rod A and the piston telescopic rod B both include a piston outer sleeve and a telescopic inner connecting rod slidably connected to the inside of the piston outer sleeve, the piston outer sleeve is arranged inside the corresponding inverted U-shaped air pressure tube or the corresponding positive U-shaped air pressure tube, the telescopic inner connecting rod is fixedly connected to the top of the connecting ring or the bottom of the connecting ring, the inner side of the piston outer sleeve is axially symmetrically provided with a driving torque groove, the outer side of the telescopic inner connecting rod is axially symmetrically provided with a built-in torque groove, the interior of the built-in torque groove is fixedly connected with a connecting spring, the interior of the built-in torque groove is slidably connected with a driving torque block fixedly connected to the connecting spring, the driving torque block can enter the interior of the driving torque groove, and the bottom surface of the driving torque block is set as an abutment inclined surface; the piston outer sleeve included in the piston telescopic rod A can drive the torque block downward through the driving torque groove, and the telescopic inner connecting rod can be extended by driving the torque groove, the abutment inclined surface and the driving torque block, the piston outer sleeve included in the piston telescopic rod B can move downward through the driving torque groove and the driving torque block, and the telescopic inner connecting rod can be shortened by driving the torque groove, the abutment inclined surface and the driving torque block.

[0013] The symmetrical piston telescopic rod A can drive the connecting ring to move downward and can drive the piston telescopic rod B to shorten. The symmetrical piston telescopic rod B can drive the connecting ring to move downward and can drive the piston telescopic rod A to extend. That is, when the valve stem moves up and down to change the opening between the valve core and the valve seat, the annular piston can move downward to squeeze the grease inside the annular grease storage cavity to achieve self-lubrication of the valve stem.

[0014] The present invention has the following beneficial effects: 1. The present invention monitors the internal oil flow rate, pressure, and temperature through a sensor group installed inside the oil inlet pipe. The controller receives data from the sensor group and can calculate the optimal opening of the valve core based on a preset algorithm to issue a command to the actuator motor, so that the actuator motor drives the rotating threaded rod to rotate, causing the valve stem to move linearly up and down, thereby changing the opening between the valve core and the valve seat. In this way, the function of automatically adjusting the oil output flow rate according to downhole conditions or production needs can be achieved.

[0015] 2. The present invention converts the rotational motion of the rotating threaded rod into linear motion of the valve stem, thereby avoiding the direct connection between the rotating threaded rod and the valve stem, which causes the valve stem to overcome linear friction and rotational friction with the sealing packing to adjust the valve core opening. That is, the linear motion of the valve stem to achieve adjustment of the valve core opening can reduce the dynamic friction between the valve stem and the sealing packing, thereby reducing the risk of leakage of the device, and the self-locking effect between the rotating threaded rod and the internal threaded sleeve can ensure the stability of the valve core position, so as to avoid fluctuations in the valve core that affect the sealing of the device.

[0016] 3. In the present invention, when the valve stem moves upward to increase the opening between the valve core and the valve seat, the piston telescopic rod A can drive the annular piston to move downward to squeeze the grease inside the annular grease storage chamber, and at the same time the piston telescopic rod B is shortened. When the valve stem moves downward to reduce the opening between the valve core and the valve seat, the piston telescopic rod B can drive the annular piston to move downward to squeeze the grease inside the annular grease storage chamber, and at the same time the piston telescopic rod A is extended. That is, when the valve stem moves linearly up and down to change the opening between the valve core and the valve seat, the annular piston can move downward to squeeze the grease inside the annular grease storage chamber to achieve self-lubrication of the valve stem, thereby reducing the dynamic friction between the valve stem and the sealing packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of an oil wellhead device with automatic flow regulation proposed by the present invention; Figure 2 for Figure 1 Schematic diagram of the external structure of the adjustable throttle valve; Figure 3 for Figure 1 Schematic diagram of the internal structure of the adjustable throttle valve; Figure 4 Schematic diagram of the structure of the valve body and valve cover in the present invention; Figure 5 Schematic diagram of the structure of the linkage mechanism in the present invention; Figure 6 Schematic diagram of the structure of the piston telescopic rod A and the piston telescopic rod B in the present invention; Figure 7 for Figure 6 A schematic diagram of the structure at center A; Figure 8 for Figure 6 A magnified schematic diagram of the structure at point B in the middle; Figure 9 It is a structural schematic diagram of the adjustable throttle valve in the present invention in a half-open state; Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point C in the middle.

[0018] In the figure: 100, wellhead; 200, casing head; 300, tubing head; 400, Christmas tree; 410, adjustable throttle valve; 411, valve body; 412, valve cover; 413, oil inlet pipe; 414, oil outlet pipe; 415, sensor group; 416, valve seat; 417, sealing packing; 418, valve stem; 419, valve core; 420, actuator; 421, sealing bearing; 422, mounting bracket; 423, actuator motor; 424, rotating threaded rod; 425, vertical slide; 426, slider; 427, cylindrical groove; 428, internal threaded sleeve; 430, annular groove; 440, liposuction sponge sleeve; 450, L-shaped grease Tube; 460, grease adding mechanism; 461, annular grease storage chamber; 462, grease injection tube; 463, conical grease adding tube; 464, annular piston; 465, connecting rod; 466, connecting ring; 470, linkage mechanism; 471, inverted U-shaped air pressure tube; 472, positive U-shaped air pressure tube; 473, annular air pressure tube; 474, one-way valve A; 475, one-way valve B; 476, piston connecting rod; 477, piston telescopic rod A; 478, piston telescopic rod B; 479, piston outer sleeve; 480, telescopic inner connecting rod; 481, driving moment groove; 482, built-in moment groove; 483, connecting spring; 484, driving moment block; 485, abutting inclined surface. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0020] like Figures 1-4 and Figure 9-10As shown, the present invention proposes an oil production wellhead device with automatic flow regulation, comprising a casing head 200, a tubing head 300, a Christmas tree 400, and a controller connected to the Christmas tree 400, which are sequentially installed at the top of the wellhead 100. The casing head 200 is mainly used to support the tubing head 300 and the Christmas tree 400. The tubing head 300 is mainly used to suspend the oil pipe. The Christmas tree 400 is mainly used to control the oil reservoir pressure and regulate the oil flow. The wellhead 100, the casing head 200, the tubing head 300, and the Christmas tree 400 are connected by a sealing structure to ensure safe and reliable oil production operations. The controller calculates and issues instructions to the actuator 420 based on a preset algorithm. The controller can calculate the optimal opening of the adjustable throttle valve 410 based on a preset algorithm (such as PID control). The specific structure and connection method of the wellhead 100, the casing head 200, the tubing head 300, the Christmas tree 400, and the controller all adopt the existing technology and are therefore not described in detail in this embodiment. The Christmas tree 400 includes an adjustable throttle valve 410 for automatically adjusting the oil production flow rate. The adjustable throttle valve 410 includes a valve body 411 for packaging and a valve cover 412 installed on the top thereof. The side and bottom of the valve body 411 are fixedly connected to an oil inlet pipe 413 and an oil outlet pipe 414 respectively. A sensor group 415 is installed inside the oil inlet pipe 413. The sensor group 415 is connected to the controller and is used to monitor the flow rate, pressure and temperature inside the oil inlet pipe 413. The flow rate, pressure and temperature data inside the oil inlet pipe 413 are the basis for achieving automatic adjustment of the oil production flow rate. The valve body 411 is installed inside a valve seat 416 extending to the upper part of the oil outlet pipe 414. 1 is installed with a sealing packing 417 close to the valve cover 412. The sealing packing 417 must have good temperature resistance, pressure resistance and corrosion resistance. The valve cover 412 is internally slidably connected to a valve stem 418 that passes through the sealing packing 417 and extends to the inside of the valve body 411. The valve stem 418 can move linearly inside the sealing packing 417, thereby reducing the dynamic friction between the valve stem 418 and the sealing packing 417. The bottom of the sealing valve stem 418 is fixedly connected to a valve core 419 for sealing the valve seat 416. The larger the opening between the valve core 419 and the valve seat 416, the greater the oil flow through the oil outlet pipe 414, and conversely, the smaller the oil flow through the oil outlet pipe 414. The outside of the valve body 411 is provided with an actuator 420 for executing the linear motion of the valve stem 418. The actuator 420 includes a sealed bearing 421 installed on the top of the valve cover 412 and an actuator motor 423 installed on the top of the valve cover 412 through a mounting bracket 422. The input end of the actuator motor 423 is connected to the controller. After receiving the data from the sensor group 415, the controller can calculate the optimal opening of the valve core 419 based on a preset algorithm and issue an instruction to the actuator motor 423. The output end of the actuator motor 423 is fixedly connected to a rotating threaded rod 424 passing through the sealed bearing 421. The actuator 420 also includes two screws opened inside the valve cover 412. The vertical slide groove 425, the internal sliding connection of the two vertical slide grooves 425 is provided with a slider 426 fixedly connected to the valve stem 418, the interior of the valve stem 418 is provided with a cylindrical groove 427 extending to its top, the interior of the cylindrical groove 427 is fixedly connected with an internal threaded sleeve 428 threadedly connected to the outside of the rotating threaded rod 424, the self-locking effect between the rotating threaded rod 424 and the internal threaded sleeve 428 can ensure the stability of the position of the valve core 419, and avoid the valve core 419 from fluctuating and affecting the sealing. The execution motor 423 is started to drive the rotating threaded rod 424 to rotate, so that the internal threaded sleeve 428 drives the valve stem 418 to move up and down to change the opening between the valve core 419 and the valve seat 416.

[0021] The working principle of this embodiment is as follows: Figure 9 As shown, when the valve core 419 in the adjustable throttle valve 410 is in a half-open state, the sensor group 415 installed inside the oil inlet pipe 413 can monitor the flow rate, pressure and temperature of the oil in the oil inlet pipe 413 and transmit the data information to the controller. After receiving the data from the sensor group 415, the controller can calculate the optimal opening of the valve core 419 based on a preset algorithm and issue an instruction to the actuator motor 423. After receiving the instruction, the actuator motor 423 drives the rotating threaded rod 424 to rotate, so that the internal threaded sleeve 428 drives the valve stem 418 to move linearly up and down (during this process, the two sliders 426 connected to the outside of the valve stem 418 slide inside the two vertical slide grooves 425 respectively), thereby changing the opening between the valve core 419 and the valve seat 416. The larger the opening between the valve core 419 and the valve seat 416, the greater the oil flow through the oil outlet pipe 414, and conversely, the smaller the oil flow through the oil outlet pipe 414. In this way, the function of automatically adjusting the oil output flow according to downhole conditions or production needs can be achieved.

[0022] The main difference between this embodiment and the prior art is that: this embodiment converts the rotational motion of the rotating threaded rod 424 into the linear motion of the valve stem 418, thereby avoiding the direct connection between the rotating threaded rod 424 and the valve stem 418, which causes the valve stem 418 to overcome the linear friction and rotational friction with the sealing packing 417 to adjust the opening of the valve core 419, that is, the linear motion of the valve stem 418 to achieve the adjustment of the opening of the valve core 419 can reduce the dynamic friction between the valve stem 418 and the sealing packing 417, thereby reducing the risk of leakage of the device, and the self-locking effect between the rotating threaded rod 424 and the internal threaded sleeve 428 can ensure the stability of the position of the valve core 419, so as to avoid fluctuations in the valve core 419 that affect the sealing of the device. Example

[0023] like Figures 1-10 As shown, based on the first embodiment, an annular groove 430 is formed in the middle of the sealing packing 417. A liposuction sponge sleeve 440 is provided inside the annular groove 430 and is sleeved on the outside of the valve stem 418. An L-shaped grease-adding tube 450 is axially symmetrically provided on the outside of the liposuction sponge sleeve 440 and extends to the top of the sealing packing 417. The liposuction sponge sleeve 440 can absorb grease squeezed out from the end of the L-shaped grease-adding tube 450. When the valve stem 418 is linearly adjusted to adjust the oil output flow rate, the liposuction sponge sleeve 440 can apply the absorbed grease to the outer surface of the valve stem 418 to reduce the dynamic friction between the valve stem 418 and the sealing packing 417. The valve cover 412 is provided with a grease adding mechanism 460 for adding grease to the interior of the axisymmetric L-shaped grease adding tube 450. The grease adding mechanism 460 includes an annular grease storage chamber 461 provided inside the valve cover 412. The outside of the annular grease storage chamber 461 is provided with a grease injection tube 462 extending to the outside of the valve cover 412. The bottom of the annular grease storage chamber 461 is axially symmetrically fixedly connected with a tapered grease adding tube 463 that can be inserted into the interior of the L-shaped grease adding tube 450. The inside of the annular grease storage chamber 461 is provided with a grease injection tube 462 extending to the outside of the valve cover 412. An annular piston 464 is provided at the bottom. The top of the annular piston 464 is axially symmetrically fixedly connected to a connecting rod 465 that passes through the valve cover 412. The tops of the axially symmetrical connecting rods 465 are jointly fixedly connected to a connecting ring 466. When the connecting ring 466 drives the annular piston 464 downward through the axially symmetrical connecting rod 465, it can squeeze the grease inside the annular grease storage chamber 461 into the interior of the tapered grease adding tube 463 and the L-shaped grease adding tube 450 to achieve self-lubrication of the valve stem 418. The top of the valve cover 412 is provided with a linkage mechanism 470 linked to the actuator 420 and the grease adding mechanism 460. The linkage mechanism 470 includes an inverted U-shaped air pressure tube 471 and a positive U-shaped air pressure tube 472 symmetrically fixedly connected to the top of the valve cover 412. An annular air pressure tube 473 is fixedly connected between the middle of the symmetrical inverted U-shaped air pressure tube 471 and the top of the symmetrical positive U-shaped air pressure tube 472. Two one-way valves A474 close to the corresponding inverted U-shaped air pressure tube 471 are symmetrically installed on the outside of the annular air pressure tube 473. A one-way valve B4 close to the annular air pressure tube 473 is installed on the outside of the symmetrical inverted U-shaped air pressure tube 471. 75, the relative one-way valves A474 are used to allow the airflow inside the annular air pressure tube 473 to pass in a direction close to each other, and the one-way valve B475 is used to allow the airflow inside the corresponding inverted U-shaped air pressure tube 471 to pass upward, that is, the gas at the lower part of the inverted U-shaped air pressure tube 471 can pass through the obstruction of the relative one-way valve A474 and enter the upper part of the inverted U-shaped air pressure tube 471 through the one-way valve B475, and the gas inside the annular air pressure tube 473 and the positive U-shaped air pressure tube 472 can pass through the obstruction of the one-way valve B475 and enter the lower part of the inverted U-shaped air pressure tube 471 through the relative one-way valve A474; One end of the symmetrical inverted U-shaped air pressure tube 471 is provided with a piston connecting rod 476 passing through the valve cover 412. The two piston connecting rods 476 are respectively fixedly connected to the top of the two sliders 426. That is, when the valve stem 418 moves up and down to change the opening between the valve core 419 and the valve seat 416, the gas inside the inverted U-shaped air pressure tube 471 can be pressurized and the gas inside the annular air pressure tube 473 and the positive U-shaped air pressure tube 472 can be decompressed through the piston connecting rod 476. The other end of the symmetrical inverted U-shaped air pressure tube 471 A piston telescopic rod A477 fixedly connected to the top of the connecting ring 466 is provided inside each of the symmetrical U-shaped air pressure tubes 472 at one end away from the annular air pressure tube 473, and a piston telescopic rod B478 fixedly connected to the bottom of the connecting ring 466 is provided inside each of the symmetrical U-shaped air pressure tubes 472. The symmetrical piston telescopic rods A477 can drive the connecting ring 466 to move downward and can drive the piston telescopic rods B478 to shorten. The symmetrical piston telescopic rods B478 can drive the connecting ring 466 to move downward and can drive the piston telescopic rods A477 to extend. The piston telescopic rod A477 and the piston telescopic rod B478 both include a piston outer sleeve 479 and a telescopic inner connecting rod 480 slidably connected to the inside of the piston outer sleeve 479. The piston outer sleeve 479 is arranged inside the corresponding inverted U-shaped air pressure tube 471 or the corresponding positive U-shaped air pressure tube 472. The telescopic inner connecting rod 480 is fixedly connected to the top of the connecting ring 466 or the bottom of the connecting ring 466. The inner side of the piston outer sleeve 479 is symmetrically provided with a driving torque groove 481, and the outer side of the telescopic inner connecting rod 480 is symmetrically provided with a built-in torque groove 482. The interior of the built-in torque groove 482 is fixedly connected to a connecting spring 483, and the interior of the built-in torque groove 482 is slidably connected to the connecting spring 483. The fixedly connected driving moment block 484 can enter the interior of the driving moment groove 481, and the bottom surface of the driving moment block 484 is set to the abutting inclined surface 485, that is, the piston outer sleeve 479 included in the piston telescopic rod A477 can move downward through the driving moment groove 481 and the driving moment block 484, and the telescopic inner connecting rod 480 can be extended through the driving moment groove 481, the abutting inclined surface 485 and the driving moment block 484, and the piston outer sleeve 479 included in the piston telescopic rod B478 can move downward through the driving moment groove 481 and the driving moment block 484, and the telescopic inner connecting rod 480 can be shortened through the driving moment groove 481, the abutting inclined surface 485 and the driving moment block 484.

[0024] The working principle of this embodiment is as follows: Figure 9 As shown, when the valve core 419 in the adjustable throttle valve 410 is in a half-open state, the valve stem 418 moves upward to increase the opening between the valve core 419 and the valve seat 416. The valve stem 418 can drive the piston connecting rod 476 to move upward through the slider 426 to pressurize the lower part of the inverted U-shaped air pressure tube 471, so that the gas at the lower part of the inverted U-shaped air pressure tube 471 can pass through the obstruction of the relative one-way valve A474 and pass through the one-way valve B475 to enter the upper part of the inverted U-shaped air pressure tube 471, thereby causing the piston to extend. The retracted rod A477 drives the connecting ring 466 to move downward, so that the connecting ring 466 drives the annular piston 464 to move downward through the axially symmetrical connecting rod 465, thereby squeezing the grease inside the annular grease storage chamber 461 into the interior of the tapered grease adding tube 463 and out through the L-shaped grease adding tube 450. The liposuction sponge sleeve 440 can absorb the grease squeezed out from the end of the L-shaped grease adding tube 450 and apply the absorbed grease to the upper outer surface of the valve stem 418, thereby reducing the dynamic friction between the valve stem 418 and the upper sealing packing 417. When the piston telescopic rod A477 drives the connecting ring 466 to move downward, the telescopic inner connecting rod 480 of the piston telescopic rod B478 can be shortened by driving the moment groove 481, the abutting inclined surface 485 and the driving moment block 484; When the valve stem 418 moves downward to reduce the opening between the valve core 419 and the valve seat 416, the valve stem 418 can drive the piston connecting rod 476 to move downward through the slider 426 to reduce the pressure inside the annular air pressure tube 473 and the positive U-shaped air pressure tube 472, so that the gas inside the annular air pressure tube 473 and the positive U-shaped air pressure tube 472 can pass through the obstruction of the one-way valve B475 and pass through the relative one-way valve A474 to enter the lower part of the inverted U-shaped air pressure tube 471, thereby causing the piston telescopic rod B478 to drive the connecting ring 466 to move downward to achieve self-lubrication of the valve stem 418; When the piston telescopic rod B478 drives the connecting ring 466 to move downward, the telescopic inner connecting rod 480 of the piston telescopic rod A477 can be extended by driving the moment groove 481, the abutting inclined surface 485 and the driving moment block 484.

[0025] The main difference between this embodiment and the prior art is that: in this embodiment, when the valve stem 418 moves upward to increase the opening between the valve core 419 and the valve seat 416, the piston telescopic rod A477 can drive the annular piston 464 to move downward to squeeze the grease inside the annular grease storage chamber 461, and at the same time the piston telescopic rod B478 is shortened. When the valve stem 418 moves downward to reduce the opening between the valve core 419 and the valve seat 416, the piston telescopic rod B478 can drive the annular piston 464 to move downward to squeeze the grease inside the annular grease storage chamber 461, and at the same time the piston telescopic rod A477 is extended, that is, when the valve stem 418 moves linearly up and down to change the opening between the valve core 419 and the valve seat 416, the annular piston 464 can move downward to squeeze the grease inside the annular grease storage chamber 461 to achieve self-lubrication of the valve stem 418, thereby reducing the dynamic friction between the valve stem 418 and the sealing packing 417.

[0026] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An oil production wellhead device with automatic flow regulation, comprising a casing head (200), a tubing head (300), a Christmas tree (400) and a controller connected to the Christmas tree (400) which are sequentially installed at the top of a wellhead (100), characterized in that: The Christmas tree (400) comprises an adjustable throttle valve (410) for automatically adjusting the oil production flow rate. The adjustable throttle valve (410) comprises a valve body (411) for packaging and a valve cover (412) installed on the top thereof. The side and bottom of the valve body (411) are respectively fixedly connected to an oil inlet pipe (413) and an oil outlet pipe (414). A sensor group (415) is installed inside the oil inlet pipe (413). A valve seat extending to the upper inner part of the oil outlet pipe (414) is installed inside the valve body (411). (416), a sealing packing (417) close to the valve cover (412) is installed inside the valve body (411), a valve stem (418) passing through the sealing packing (417) and extending into the interior of the valve body (411) is slidably connected inside the valve cover (412), a valve core (419) for sealing the valve seat (416) is fixedly connected to the bottom of the valve stem (418), and an actuator (420) for executing the linear movement of the valve stem (418) is arranged outside the valve body (411); An annular groove (430) is provided in the middle of the sealing packing (417), and a liposuction sponge sleeve (440) is provided inside the annular groove (430) and is sleeved on the outside of the valve stem (418). An L-shaped grease adding tube (450) extending to the top of the sealing packing (417) is axially symmetrically provided outside the liposuction sponge sleeve (440), and a grease adding mechanism (460) for adding grease to the axially symmetrical L-shaped grease adding tube (450) is provided inside the valve cover (412), and a linkage mechanism (470) that is linked to the actuator (420) and the grease adding mechanism (460) is provided on the top of the valve cover (412).

2. The oil wellhead device with automatic flow regulation according to claim 1, characterized in that: The sensor group (415) is connected to the controller and is used to monitor the flow rate, pressure and temperature inside the oil inlet pipe (413). The controller calculates based on a preset algorithm and issues instructions to the actuator (420) to operate.

3. The oil wellhead device with automatic flow regulation according to claim 1, characterized in that: The actuator (420) comprises a sealed bearing (421) mounted on the top of the valve cover (412) and an actuator motor (423) mounted on the top of the valve cover (412) via a mounting bracket (422); an input end of the actuator motor (423) is connected to the controller, and an output end of the actuator motor (423) is fixedly connected to a rotating threaded rod (424) passing through the sealed bearing (421); The actuator (420) further comprises two vertical slide grooves (425) provided inside the valve cover (412), wherein the two vertical slide grooves (425) are internally slidably connected to a slider (426) fixedly connected to the valve stem (418), wherein the valve stem (418) is internally provided with a cylindrical groove (427) extending to the top thereof, wherein the cylindrical groove (427) is internally fixedly connected to an internal threaded sleeve (428) threadedly connected to the outside of the rotating threaded rod (424).

4. The oil wellhead device with automatic flow regulation according to claim 3, characterized in that: The grease adding mechanism (460) comprises an annular grease storage chamber (461) opened inside the valve cover (412), a grease injection tube (462) extending to the outside of the valve cover (412) is arranged outside the annular grease storage chamber (461), a conical grease adding tube (463) which can be inserted into the L-shaped grease adding tube (450) is axially symmetrically fixedly connected to the bottom of the annular grease storage chamber (461), an annular piston (464) is arranged inside the annular grease storage chamber (461), a connecting rod (465) passing through the valve cover (412) is axially symmetrically fixedly connected to the top of the annular piston (464), and a connecting ring (466) is fixedly connected to the top of the axially symmetrical connecting rod (465).

5. The oil wellhead device with automatic flow regulation according to claim 4, characterized in that: The linkage mechanism (470) comprises an inverted U-shaped air pressure tube (471) and a positive U-shaped air pressure tube (472) symmetrically fixedly connected to the top of the valve cover (412); an annular air pressure tube (473) is fixedly connected between the middle of the symmetrical inverted U-shaped air pressure tube (471) and the top of the symmetrical positive U-shaped air pressure tube (472); two one-way valves A (474) close to the corresponding inverted U-shaped air pressure tubes (471) are symmetrically installed on the outside of the annular air pressure tube (473); and one-way valves B (475) close to the annular air pressure tubes (473) are installed on the outside of the symmetrical inverted U-shaped air pressure tubes (471). , a piston connecting rod (476) passing through the valve cover (412) is disposed inside one end of the symmetrical inverted U-shaped air pressure tube (471), and the two piston connecting rods (476) are respectively fixedly connected to the top of the two sliding blocks (426), and a piston telescopic rod A (477) fixedly connected to the top of the connecting ring (466) is disposed inside the other end of the symmetrical inverted U-shaped air pressure tube (471), and a piston telescopic rod B (478) fixedly connected to the bottom of the connecting ring (466) is disposed inside the end of the symmetrical positive U-shaped air pressure tube (472) away from the annular air pressure tube (473).

6. The oil wellhead device with automatic flow regulation according to claim 5, characterized in that: The corresponding one-way valves A (474) are used to allow the airflow inside the annular air pressure tube (473) to pass in a direction approaching each other, and the one-way valves B (475) are used to allow the airflow inside the corresponding inverted U-shaped air pressure tube (471) to pass upward.

7. The oil wellhead device with automatic flow regulation according to claim 5, characterized in that: The piston telescopic rod A (477) and the piston telescopic rod B (478) both include a piston outer sleeve (479) and a telescopic inner connecting rod (480) slidably connected to the inside of the piston outer sleeve (479). The piston outer sleeve (479) is arranged inside the corresponding inverted U-shaped air pressure tube (471) or inside the corresponding positive U-shaped air pressure tube (472). The telescopic inner connecting rod (480) is fixedly connected to the top of the connecting ring (466) or the bottom of the connecting ring (466). The piston outer sleeve (479) A driving moment groove (481) is symmetrically provided on the inner side of the telescopic inner connecting rod (480), and a built-in moment groove (482) is symmetrically provided on the outer side of the telescopic inner connecting rod (480). A connecting spring (483) is fixedly connected to the interior of the built-in moment groove (482), and a driving moment block (484) fixedly connected to the connecting spring (483) is slidably connected to the interior of the built-in moment groove (482). The driving moment block (484) can enter the interior of the driving moment groove (481), and the bottom surface of the driving moment block (484) is arranged to abut against the inclined surface (485).

8. The oil wellhead device with automatic flow regulation according to claim 5, characterized in that: The symmetrical piston telescopic rod A (477) can drive the connecting ring (466) to move downward and can drive the piston telescopic rod B (478) to shorten, and the symmetrical piston telescopic rod B (478) can drive the connecting ring (466) to move downward and can drive the piston telescopic rod A (477) to extend.

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