Novel plunger wellhead gas production tree

Abstract

The utility model discloses a novel plunger wellhead christmas tree which comprises a standard christmas tree and a christmas tree bypass pipe, the standard christmas tree is vertically arranged, the christmas tree bypass pipe is arranged on the side edge of the standard christmas tree in a communicated mode, and the joint position of the christmas tree bypass pipe and the standard christmas tree is higher than the top of the main drift diameter of the center of the christmas tree. A sealing plunger is arranged on the inner side of the standard gas production tree, and the outer diameter of the sealing plunger is slightly smaller than the inner diameter of the main drift diameter of the center of the gas production tree. The sealing plunger is arranged, the diameter of the sealing plunger is slightly smaller than the inner diameter of the main drift diameter of the center of the gas production tree, a gap can be formed when the sealing plunger moves to the position of the main drift diameter of the center of the gas production tree, a channel is provided for gas-liquid circulation, and therefore the thrust generated by gas and liquid to the sealing plunger is smaller than the gravity of the sealing plunger. And the sealing plunger cannot move to the gas production tree bypass pipe, so that the freezing and blocking phenomena are avoided.

Description

Technical Field

[0001] The utility model relates to the field of gas production trees, in particular to a novel plunger wellhead gas production tree. Background Art

[0002] In the process of exploitation of low-pressure oil and gas fields and coalbed methane, in order to ensure the normal operation of the gas well and achieve stable and high production, it is necessary to discharge the liquid accumulated in the wellbore in time. In the prior art, the use of a plunger is one of the commonly used methods of drainage. The conventional plunger process requires welding a bypass pipeline on the wellhead gas tree, which destroys the original gas tree standards of the gas tree and increases construction and material costs and safety risks. At the same time, when the plunger reaches the wellhead, the high-pressure fluid is prone to freezing and blocking the gas tree bypass pipe when passing through the gas tree bypass pipe, affecting drainage.

[0003] Although, a Chinese patent with the patent publication number CN204804737U discloses a simple plunger device at the wellhead of a gas well, which includes: a first valve of a gas tree connected to the wellhead, a second valve of a gas tree and a third valve of a gas tree; the other end of the first valve of the gas tree is connected to the fourth valve and the fifth valve; the other end of the fourth valve is connected to the wellhead blowout prevention device; the first end of the solenoid valve is connected to the third valve and the fifth valve of the gas tree, and the second end is connected to the flow meter; the other end of the flow meter is connected to the stop valve. When the device provided by the above patent is working, the gas wellhead solenoid valve of the solenoid valve is used to switch the well to replace the pneumatic stop valve and the intelligent control box of the conventional plunger gas lift ground device, simplifying the plunger gas lift wellhead device system, achieving the purpose of controlling the plunger gas lift device to switch the well with the solenoid valve, and achieving the purpose of simplifying the device and reducing the cost. However, it does not solve the problem that the bypass pipeline of the gas tree is easily frozen and blocked when the plunger process is used to open the well. Utility Model Content

[0004] The utility model aims to provide a novel plunger wellhead gas production tree, aiming to improve the problem of easy freezing and blocking of gas production tree bypass pipeline when the plunger process is used to open a well in the prior art.

[0005] The utility model is implemented as follows: a novel plunger wellhead gas tree comprises a standard gas tree and a gas tree bypass pipe, the standard gas tree is vertically arranged, the gas tree bypass pipe is arranged on the side of the standard gas tree, and the intersection position of the gas tree bypass pipe and the standard gas tree is higher than the top of the central main path of the gas tree, a sealing plunger is arranged on the inner side of the standard gas tree, and the outer diameter of the sealing plunger is slightly smaller than the inner diameter of the central main path of the gas tree.

[0006] Preferably, an angle valve is provided on the side of the bypass pipe of the gas production tree, and a driver power head and a driver reducer are provided at one end of the angle valve. The driver power head drives the driver reducer to rotate and control the rotation of the angle valve core shaft.

[0007] Preferably, an output pipeline is provided at the other end of the angle valve, and a pipeline pressure sensor is provided on the output pipeline.

[0008] Preferably, a pressure control module is also provided on the side of the angle valve, and the pressure control module is electrically connected to the pipeline pressure sensor and the driver power head.

[0009] Preferably, one angle valve and five gate valves are provided on the standard gas tree, or one angle valve and nine gate valves are provided on the standard gas tree.

[0010] Preferably, a plunger catcher is provided at the top of the standard gas tree, and the plunger catcher is located above the bypass pipe of the gas tree.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model is provided with a sealing plunger, and the diameter of the sealing plunger is slightly smaller than the inner diameter of the main diameter of the center of the gas tree, so that a gap is formed when the sealing plunger moves to the main diameter of the center of the gas tree, providing a channel for gas-liquid circulation, thereby making the thrust generated by the gas and liquid on the sealing plunger smaller than the gravity of the sealing plunger itself. Therefore, the sealing plunger cannot move to the bypass pipe of the gas tree, thereby preventing ice and freezing.

[0013] 2. The setting of the utility model reduces the construction workload of on-site measurement, cranes, welding, etc., avoids the problem of welding bypass pipelines damaging the original gas tree standards, reduces process construction and material costs, reduces the risk of hot welding at the natural gas wellhead, and can also reduce the demolition cost and risk when the later plunger process is moved to other wellheads. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the working principle provided by the embodiment of the wellhead gas production tree of the utility model;

[0015] Figure 2 This is a schematic diagram of the working principle of a conventional double bypass plunger wellhead gas tree;

[0016] Figure 3 This is a schematic diagram of the working principle of a conventional single bypass plunger wellhead gas tree.

[0017] In the figure: A1, gate valve; A2, sealing plunger; A3, gas-liquid flow; A4, main central diameter of the gas tree; A5, gas tree; A6, plunger catcher; A7, gas tree bypass pipe; A8, angle valve; A9, drive power head; A10, drive reducer; A11, output pipeline; A12, pipeline pressure sensor; A13, pressure control module; A14, upper bypass pipe; A15, pneumatic valve; A16, intermediate bypass pipe. DETAILED DESCRIPTION

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0020] Example 1

[0021] Figure 1 Schematic diagram of the working principle of the new plunger wellhead gas production tree provided for the embodiment of the utility model; the new plunger wellhead gas production tree comprises a standard gas production tree A5, a plunger catcher A6, an angle valve A8, a driver power head A9, a driver reducer A10, a sealing plunger A2, a pipeline pressure sensor A12 and a pressure control module A13.

[0022] The gas tree is a standard gas tree A5, which is a standard gas tree with 5 gate valves and 1 electric angle valve A8. A plunger catcher A6 is installed on the top of the standard gas tree A5. The plunger catcher A6 is responsible for the plunger upward impact buffer and plunger capture functions. The electric angle valve A8 is a standard gas tree angle valve operating end with a motor driver installed; the motor driver includes a driver power head A9 and a driver reducer A10, and the sealing plunger A2 is a plunger in the prior art. The sealing plunger A2 has a sealing function that fits with the inner wall of the downhole pipeline and has good sealing performance and drainage effect; the outer diameter of the sealing plunger A2 has a certain gap with the central main diameter A4 of the standard gas tree A5.

[0023] The motor driver drives the angle valve A8, implements the axial movement of the valve core of the angle valve A8, and realizes the opening and closing of the valve core. The action of the motor driver accepts the instruction of the pressure control module A13 to implement the action. The pressure control module A13 monitors the pipeline pressure sensor signal and implements the judgment. After the judgment, it commands the motor driver to act to implement the opening and closing of the angle valve A8, or the opening size control of the valve port of the angle valve A8.

[0024] The innovative point of the new plunger wellhead gas tree is that when the plunger opens the well, there is no high-pressure throttling between the sealing plunger A2 and the gas tree bypass pipe A7 channel, and no freezing or blocking. The implementation method is to control the gas-liquid flow by controlling the pipeline pressure. There is a certain gap between the main channel A4 in the center of the gas tree and the outer diameter of the sealing plunger A2, so that the gas-liquid thrust is less than the weight of the sealing plunger A2. The plunger cannot reach the through hole position of the gas tree bypass pipe A7, but stays at the bottom of the gas tree A5. The sealing plunger A2 is constantly jumping or shaking due to the flow of gas and liquid, so that there is no freezing or blocking phenomenon, and the plunger process works normally. At the same time, the new plunger wellhead gas tree A5 is a standard gas well gas tree, without the upper bypass pipe A14, pneumatic valve A15 and intermediate bypass pipe A16, which reduces the construction workload such as on-site measurement, cranes, welding, etc., avoids the problem of welding bypass pipelines destroying the original gas tree standards, reduces process construction and material costs, reduces the risk of hot welding at the natural gas wellhead, and can also reduce the demolition cost and risk when the later plunger process is moved to other wellheads.

[0025] Before opening the well, the pressure control module A13 is adjusted to control the maximum and minimum pressures of the output pipeline A11, and corresponds to the appropriate gas-liquid flow rate to ensure that the plunger cannot move up to the bypass pipe A7 channel of the gas tree. During the opening of the well, the pressure control module A13 always monitors the pipeline pressure sensor A12 and issues control commands at any time.

[0026] During the well opening process of the plunger system, when the pipeline pressure sensor A12 shows that the pressure reaches the maximum pressure of the pipeline A11 controlled by the pressure control module A13, the pressure control module A13 sends a stop command to the angle valve driver power head A9, and the angle valve driver stops increasing the valve port; when the pipeline pressure sensor shows that the pressure is higher than the maximum pressure of the pipeline A11 controlled by the pressure control module A13, the pressure control module A13 sends a valve closing command to the angle valve driver power head A9, and the angle valve driver closes the valve port until the pressure of the pipeline A11 is less than or equal to the maximum pressure of the pipeline controlled by the pressure control module A13. Pressure stops; as the well opening time increases, the wellbore energy gradually decreases. When the pressure of pipeline A11 drops to the lowest pressure of pipeline A11 controlled by pressure control module A13, pressure control module A13 issues a valve opening increase instruction, instructing angle valve driver power head A9 to increase the valve opening to the highest pressure of the pipeline and stop. When the highest pressure of the pipeline cannot be reached, it means that the gas-liquid flow is too small to push the sealing plunger to the bypass pipe A7 channel of the gas production tree. At this time, pressure control module A13 issues a valve opening increase instruction, and angle valve driver power head A9 continues to increase the valve opening to the set valve opening value. In this way, the plunger will not freeze during the well opening process, ensuring the normal operation of the plunger system.

[0027] Example 2

[0028] Figure 1Schematic diagram of the working principle of the new plunger wellhead gas production tree provided for the embodiment of the utility model; the new plunger wellhead gas production tree comprises a standard gas production tree A5, a plunger catcher A6, an angle valve A8, a driver power head A9, a driver reducer A10, a sealing plunger A2, a pipeline pressure sensor A12 and a pressure control module A13.

[0029] The gas tree is a standard gas tree A5, which is a standard gas tree with 5 gate valves and 1 electric angle valve A8. A plunger catcher A6 is installed on the top of the standard gas tree A5. The plunger catcher A6 is responsible for the plunger upward impact buffer and plunger capture functions. The electric angle valve A8 is a standard gas tree angle valve operating end with a motor driver installed; the motor driver includes a driver power head A9 and a driver reducer A10, and the sealing plunger A2 is a plunger in the prior art. The sealing plunger A2 has a sealing function that fits with the inner wall of the downhole pipeline and has good sealing performance and drainage effect; the outer diameter of the sealing plunger A2 has a certain gap with the central main diameter A4 of the standard gas tree A5.

[0030] The motor driver drives the angle valve A8, implements the axial movement of the valve core of the angle valve A8, and realizes the opening and closing of the valve core. The action of the motor driver accepts the instruction of the pressure control module A13 to implement the action. The pressure control module A13 monitors the pipeline pressure sensor signal and implements the judgment. After the judgment, it commands the motor driver to act to implement the opening and closing of the angle valve A8, or the opening size control of the valve port of the angle valve A8.

[0031] The innovative point of the new plunger wellhead gas tree is that when the plunger opens the well, there is no high-pressure throttling between the sealing plunger A2 and the gas tree bypass pipe A7 channel, and no freezing or blocking. The implementation method is to control the gas-liquid flow by controlling the pipeline pressure. There is a certain gap between the main channel A4 in the center of the gas tree and the outer diameter of the sealing plunger A2, so that the gas-liquid thrust is less than the weight of the sealing plunger A2. The plunger cannot reach the through hole position of the gas tree bypass pipe A7, but stays at the bottom of the gas tree A5. The sealing plunger A2 is constantly jumping or shaking due to the flow of gas and liquid, so that there is no freezing or blocking phenomenon, and the plunger process works normally. At the same time, the new plunger wellhead gas tree A5 is a standard gas well gas tree, without the upper bypass pipe A14, pneumatic valve A15 and intermediate bypass pipe A16, which reduces the construction workload such as on-site measurement, cranes, welding, etc., avoids the problem of welding bypass pipelines destroying the original gas tree standards, reduces process construction and material costs, reduces the risk of hot welding at the natural gas wellhead, and can also reduce the demolition cost and risk when the later plunger process is moved to other wellheads.

[0032] When the sealing plunger A2 is not lowered into the gas well, the pressure control module A13 is adjusted before the well is opened. The pressure control module A13 controls the maximum and minimum pressures of the output pipeline A11 and corresponds to the appropriate gas-liquid flow rate to ensure the intelligent intermittent production of the gas well. During the well opening, the pressure control module A13 always monitors the pipeline pressure sensor A12 and issues command control at any time.

[0033] During the intermittent production and opening of the gas well, when the pipeline pressure sensor A12 shows that the pressure reaches the maximum pressure of the pipeline A11 controlled by the pressure control module A13, the pressure control module A13 sends a stop command to the angle valve driver power head A9, and the angle valve driver stops increasing the valve opening; when the pipeline pressure sensor shows that the pressure is higher than the maximum pressure of the pipeline A11 controlled by the pressure control module A13, the pressure control module A13 sends a valve closing command to the angle valve driver power head A9, and the angle valve driver closes the valve opening until the pressure of the pipeline A11 is less than or equal to the maximum pressure of the pipeline controlled by the pressure control module A13. High pressure stops; as the well opening time increases, the wellbore energy gradually decreases, and when the pressure of pipeline A11 drops to the lowest pressure of pipeline A11 controlled by pressure control module A13, pressure control module A13 issues a valve opening increase instruction, and commands angle valve driver power head A9 to increase the valve opening to the highest pressure of the pipeline and stop. When the highest pressure of the pipeline cannot be reached, it means that the gas-liquid flow rate is already small and cannot push the sealing plunger to the bypass pipe A7 channel of the gas tree. At this time, pressure control module A13 issues a valve opening increase instruction, and angle valve driver power head A9 continues to increase the valve opening to the set valve opening value. In this way, the gas-liquid fluid flow rate of the output pipeline can be accurately controlled during the well opening process to ensure the realization of intelligent intermittent production of gas wells.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of plunger wellhead gas tree, characterized in that: The invention comprises a standard gas production tree (A5) and a gas production tree bypass pipe (A7), wherein the standard gas production tree (A5) is arranged vertically, and the gas production tree bypass pipe (A7) is arranged on the side of the standard gas production tree (A5), and the intersection position between the gas production tree bypass pipe (A7) and the standard gas production tree (A5) is higher than the top of the central main diameter (A4) of the gas production tree, and a sealing plunger (A2) is arranged on the inner side of the standard gas production tree (A5), and the outer diameter of the sealing plunger (A2) is slightly smaller than the inner diameter of the central main diameter (A4) of the gas production tree.

2. A novel plunger wellhead gas tree according to claim 1, characterized in that: An angle valve (A8) is provided on the side of the gas production tree bypass pipe (A7), and a driver power head (A9) and a driver reducer (A10) are provided at one end of the angle valve (A8). The driver power head (A9) drives the driver reducer (A10) to rotate and control the rotation of the core shaft of the angle valve (A8).

3. A new type of plunger wellhead gas tree according to claim 2, characterized in that: An output pipeline (A11) is provided in communication with the other end of the angle valve (A8), and a pipeline pressure sensor (A12) is provided on the output pipeline (A11).

4. A novel plunger wellhead gas tree according to claim 3, characterized in that: A pressure control module (A13) is also provided on the side of the angle valve (A8), and the pressure control module (A13) is electrically connected to the pipeline pressure sensor (A12) and the driver power head (A9).

5. A novel plunger wellhead gas tree according to claim 1, characterized in that: The standard gas tree (A5) is provided with one angle valve (A8) and five gate valves (A1), or the standard gas tree (A5) is provided with one angle valve (A8) and nine gate valves (A1).

6. A novel plunger wellhead gas tree according to claim 5, characterized in that: A plunger catcher (A6) is arranged on the top of the standard gas tree (A5), and the plunger catcher (A6) is located above the bypass pipe of the gas tree (A5).

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