Gas production system and process with velocity string motor throttling

Abstract

The speed string electric throttling gas production system disclosed by the application comprises a winding and unwinding mechanism with a speed string, an electric throttle valve connected to the speed string through a gooseneck support, a vehicle frame connected to the gooseneck support through a hinge support frame, and the hinge support frame being fixedly connected to the vehicle frame. The gas production process of the application injects the speed string and the electric throttle valve into a well, starts a motor through a control cable, drives a trapezoidal threaded rod to rotate, and drives a throttle adjusting rod to push a valve disc to move up and down to form a flow passage, so that the pressure and flow rate of the fluid are adjusted to achieve the throttling purpose. The speed string electric throttling gas production system and process of the application connect the electric throttle valve with the speed string, do not need to perform a wire fishing operation, and reduce the daily maintenance cost of the gas well; the control cable and the pressure and temperature monitoring optical fiber arranged in the speed string are used to directly adjust the electric throttle valve, and the fine level of the gas well management is improved.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction technology, specifically relating to a velocity tubing electric throttling gas production system. This invention also relates to the gas production process of the aforementioned velocity tubing electric throttling gas production system. Background Technology

[0002] During natural gas well production, high-pressure gas wells require the installation of throttling devices to regulate and control production and pressure. Depending on their installation location, throttling devices can be categorized as surface or downhole throttling devices. Since gas well production often involves two-phase flow of gas and water, or multi-phase flow of oil, gas, and water, when fluid passes through a throttling channel, the flow area decreases, the fluid velocity increases, and the fluid's internal energy is used to increase kinetic energy, causing a rapid drop in the fluid's temperature.

[0003] Therefore, when using surface throttling devices, under conditions of low ambient temperature, the temperature of the gas well's produced fluid continuously decreases, easily leading to the formation of natural gas hydrates and surface process ice blockage. Downhole throttling devices, on the other hand, are typically deployed at a certain depth downhole. Due to the relatively high downhole temperature and initial fluid temperature, the fluid can fully exchange heat with the formation after throttling, effectively preventing the formation of natural gas hydrates. Furthermore, the increased fluid velocity after throttling significantly enhances the gas well's fluid-carrying capacity, reducing the risk of fluid accumulation and extending the well's self-flowing production cycle. However, existing downhole throttling devices have two main problems. First, current downhole throttling processes require wireline retrieval for deployment, which is difficult, time-consuming, and cumbersome in complex well conditions, resulting in a low success rate. Second, traditional downhole throttling processes use mechanical control, which cannot adjust the throttling nozzle diameter in real time, making production management more difficult. Summary of the Invention

[0004] The purpose of this invention is to provide an electric throttling gas production system for velocity tubing, which connects the electric throttling valve to the velocity tubing, eliminating the need for wireline retrieval operations and reducing the daily maintenance costs of gas wells.

[0005] Another objective of this invention is to provide an electric throttling gas production process using a velocity tubing. This process directly adjusts the electric throttling valve via a control cable and pressure and temperature monitoring fiber optic cable installed within the velocity tubing, thereby improving the precision of gas well management.

[0006] The first technical solution adopted in this invention is a velocity tube electric throttling gas sampling system, including a retraction mechanism with a velocity tube wound around it, the velocity tube passing through a gooseneck support and connected to an electric throttling valve, the gooseneck support being connected to a vehicle frame via a hinge support frame, and the hinge support frame being fixedly connected to the vehicle frame.

[0007] The first technical solution of the present invention is further characterized in that,

[0008] The velocity column has a single gas delivery channel along the axial direction, and a pair of carbon fiber rod cables are also threaded through the velocity column along the axial direction. The pair of carbon fiber rod cables are respectively equipped with control cables and pressure and temperature monitoring optical fibers.

[0009] The electric throttle valve includes an outer sleeve and a motor sleeve connected by threads. Both the outer sleeve and the motor sleeve are hollow cylindrical. The outer sleeve has a wiring hole along the axial direction. The valve seat, valve disc, throttle adjustment rod and trapezoidal threaded screw are connected in sequence from top to bottom inside the outer sleeve. An air inlet is provided on the outer sleeve corresponding to the position of the valve seat. A flow channel is formed between the valve disc and the valve seat to throttle the fluid entering through the air inlet. A wave spring a is provided on the outside of the throttle adjustment rod to limit the upward movement of the throttle adjustment rod. A wave spring b is provided on the outside of the trapezoidal threaded screw to buffer the downward movement of the throttle adjustment rod.

[0010] The trapezoidal threaded screw is connected to a coupling, which is connected to the motor via a drive shaft. Both the coupling and the motor are located inside the electrode sleeve. The motor sleeve is connected to a voltage stabilizing cover via a thread at the end away from the outer sleeve. A capsule respirator is snapped into place at the connection between the motor sleeve and the voltage stabilizing cover. An annular cavity hole is provided on the capsule respirator at the position away from the motor.

[0011] Rubber sealing rings are provided at the connection between the outer casing and the motor sleeve, and at the connection between the motor sleeve and the voltage stabilizer cover.

[0012] A wiring sealing plug is installed inside the wiring hole, and a rubber sealing ring is fitted over the wiring sealing plug.

[0013] A motor pressure sleeve is fitted onto the outer side of the trapezoidal threaded screw, and the motor pressure sleeve is located at one end of the inner side of the motor sleeve.

[0014] A support cylinder is connected to the frame via a pin, and the other end of the support cylinder is pinned to the side wall of the hinge support frame. A liftable injection head is installed on the hinge support frame, and the speed tube passes through the liftable injection head. An upper blowout preventer and a lower blowout preventer are also sleeved on the outside of the speed tube.

[0015] The chassis is also equipped with a hydraulic workstation and a control room. The hydraulic workstation is connected to the electric throttle valve via a pressure and temperature monitoring fiber optic cable, and the control room is connected to the motor via a control cable passing through a wiring hole.

[0016] The second technical solution adopted in this invention is a velocity tubing electric throttling gas production process, the specific steps of which are as follows:

[0017] Step 1: Connect one end of the velocity string to the electric throttle valve. The retraction mechanism releases the velocity string. The velocity string enters the liftable injection head through the gooseneck support. The liftable injection head clamps and straightens the velocity string. When the liftable injection head is working, it simultaneously controls the upper blowout preventer and the lower blowout preventer to ensure the safe injection of the velocity string into the gas well.

[0018] Step 2: Start the motor through the control cable built into the velocity tubing. The downhole fluid enters the inner cavity through the air inlet. Adjust the flow channel gap to allow the fluid to enter the gas delivery channel through the air inlet and be delivered to the surface.

[0019] The second technical solution of the present invention is further characterized in that,

[0020] In step 2, after the motor starts, it drives the coupling to rotate through the transmission shaft. The coupling drives the trapezoidal threaded screw to rotate. The throttling adjustment rod moves up and down relative to the outer sleeve under the rotation of the trapezoidal threaded screw, thereby adjusting the gap of the flow passage between the valve disc and the valve seat, and the fluid entering through the air inlet is throttled.

[0021] The beneficial effects of this invention are:

[0022] (1) The velocity tubing electric throttling gas production system of the present invention connects the velocity tubing and the electric throttling valve, and sets the electric throttling valve at a certain depth in the well. The throttling and pressure reduction process of the electric throttling valve occurs in the well, and can fully exchange heat with geothermal energy, thus avoiding the problem of ice blockage in the well tubing and surface process caused by the generation of natural gas hydrates during the gas production process.

[0023] (2) The electric throttling gas production process of the present invention can automatically adjust the flow area of ​​the electric throttling valve nozzle according to the gas well production and pressure control needs, thereby adjusting the gas flow rate and the critical liquid carrying flow rate of the gas well, eliminating downhole liquid accumulation or slowing down the downhole liquid accumulation rate, extending the gas well self-flowing cycle, and improving the production efficiency of the gas well.

[0024] (3) The electric throttling gas production system of the present invention is directly installed at the bottom of the velocity tubing during operation. There is no need to perform wireline retrieval to replace the nozzle during use, which reduces the daily maintenance cost of the gas well.

[0025] (4) The electric throttling gas production system of the present invention has a built-in distributed temperature monitoring optical fiber and can be equipped with downhole pressure and temperature sensors as needed. This enables the monitoring of wellbore temperature distribution and downhole pressure, and the judgment of the throttling, liquid carrying effect and gas-liquid slippage of the throttling device. This can improve the intelligence level of gas wells and the refinement level of gas well management, and give full play to the production capacity of gas wells. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the velocity tubing electric throttling gas collection system of the present invention;

[0027] Figure 2 This is a schematic diagram of the throttling valve in the velocity tubing electric throttling gas extraction system of the present invention;

[0028] Figure 3This is a schematic diagram of the velocity column in the electric throttling gas extraction system of the velocity column of the present invention.

[0029] In the diagram, 1. Electric throttle valve, 1-1. Annular cavity hole, 1-2. Air inlet, 1-3. Wiring sealing plug, 1-4. Valve seat, 1-5. Valve disc, 1-6. Outer sleeve, 1-7. Wave spring a, 1-8. Throttling adjustment rod, 1-9. Wave spring b, 1-10. Trapezoidal threaded screw, 1-11. Wiring hole, 1-12. Motor pressure sleeve, 1-13. Coupling, 1-14. Motor, 1-15. Motor sleeve, 1-16. Capsule respirator, 1-17. Pressure stabilizing cover;

[0030] 2. Hydraulic workstation, 3. Control room, 4. Retraction mechanism, 5. Gooseneck support, 6. Support cylinder, 7. Hinge support frame, 8. Liftable injection head, 9. Upper blowout preventer, 10. Lower blowout preventer, 11. Speed ​​column, 12. Chassis, 13. Air supply channel, 14. Carbon fiber rod cable, 15. Control cable, 16. Pressure and temperature monitoring fiber optic cable. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] The structure of the velocity-column electric throttling gas collection system of the present invention is as follows: Figure 1 As shown, the system includes a take-up and take-down mechanism 4 with a velocity string 11 wound around it. The velocity string 11 passes through a gooseneck support 5 and is connected to an electric throttle valve 1. By connecting the velocity string 11 and the electric throttle valve 1 and setting the electric throttle valve 1 at a certain depth downhole, the throttling and pressure reduction process of the electric throttle valve 1 occurs downhole, allowing for sufficient heat exchange with geothermal energy. This avoids the problem of ice blockage in the downhole string and surface process caused by the formation of natural gas hydrates during gas production. Furthermore, it is directly installed at the bottom of the velocity string 11 during operation, eliminating the need for wireline retrieval to replace the nozzle during use, thus reducing the daily maintenance cost of the gas well.

[0033] The gooseneck bracket 5 is connected to the frame 12 via a hinge support frame 7, and the hinge support frame 7 is fixedly connected to the frame 12.

[0034] A support cylinder 6 is connected to the frame 12 by a pin, and the other end of the support cylinder 6 is pinned to the side wall of the hinge support frame 7. A liftable injection head 8 is provided on the hinge support frame 7, and the speed column 11 passes through the liftable injection head 8. An upper blowout preventer 9 and a lower blowout preventer 10 are also sleeved on the outside of the speed column 11.

[0035] The chassis 12 is also equipped with a hydraulic workstation 2 and a control room 3. The hydraulic workstation 2 is connected to the electric throttle valve 1 through the speed column 11, and the control room 3 is connected to the electric throttle valve 1 through the speed column 11.

[0036] like Figure 2 As shown, the electric throttle valve 1 includes an outer sleeve 1-6 and a motor sleeve 1-15 connected by threads. Both the outer sleeve 1-6 and the motor sleeve 1-15 are hollow cylindrical. The outer sleeve 1-6 has a wiring hole 1-11 along the axial direction. A wiring sealing plug 1-3 is provided in the wiring hole 1-11. A rubber sealing ring is attached to the outer sleeve of the wiring sealing plug 1-3. The outer sleeve 1-6 is connected from top to bottom to a valve seat 1-4, a valve disc 1-5, a throttle adjustment rod 1-8, and a trapezoidal threaded screw 1-10. The outer sleeve 1-6 is provided with an air inlet 1-2 corresponding to the position of the valve seat 1-4. A flow passage is formed between the valve disc 1-5 and the valve seat 1-4 to throttle the fluid entering through the air inlet 1-2. The gap of the flow passage can be adjusted. A wave spring a1-7 is provided on the outside of the throttle adjustment rod 1-8 to limit the upward movement of the throttle adjustment rod 1-8. A wave spring b1-9 is provided on the outside of the trapezoidal threaded screw 1-10 to buffer the downward movement of the throttle adjustment rod 1-8.

[0037] A trapezoidal threaded screw 1-10 is connected to a coupling 1-13. A motor pressure sleeve 1-12 is sleeved on the outside of the trapezoidal threaded screw 1-10. The motor pressure sleeve 1-12 is located at one end of the inner side of the motor sleeve 1-15. The coupling 1-13 is connected to the motor 1-14 through a transmission shaft. Both the coupling 1-13 and the motor 1-14 are located inside the motor sleeve 1-15. A pressure stabilizing cover 1-17 is threadedly connected to the end of the motor sleeve 1-15 away from the outer sleeve 1-6. A capsule respirator 1-16 is snapped into place at the connection between the motor sleeve 1-15 and the pressure stabilizing cover 1-17. An annular cavity hole 1-1 is provided on the capsule respirator 1-16 away from the motor 1-14.

[0038] Rubber sealing rings are provided at the connection between the outer sleeve 1-6 and the motor sleeve 1-15, and at the connection between the motor sleeve 1-15 and the voltage stabilizer cover 1-17. A fixing ring is also provided below the rubber sealing ring.

[0039] like Figure 3 As shown, the velocity string 11 has a single gas delivery channel 13 along its axial direction. A pair of carbon fiber rod cables 14 also run through the velocity string 11 along its axial direction. Each pair of carbon fiber rod cables 14 contains a control cable 15 and a pressure and temperature monitoring fiber optic cable 16. Downhole pressure and temperature sensors can be installed as needed to monitor the wellbore temperature distribution and downhole pressure, thereby determining the throttling and liquid-carrying effects of the electric throttle valve 1 and the gas-liquid slippage situation. This improves the intelligence level and precision of gas well management, fully utilizing the gas well's production capacity. The hydraulic workstation 2 is connected to the electric throttle valve 1 via the pressure and temperature monitoring fiber optic cable 16, and the control room 3 is connected to the motor 1-14 via the control cable 15 passing through the wiring hole 1-11.

[0040] The velocity tubing electric throttling gas collection process employs a velocity tubing electric throttling gas collection system. The specific steps are as follows:

[0041] Step 1: One end of the velocity string 11 is connected to the electric throttle valve 1. The retraction mechanism 4 releases the velocity string 11. The velocity string 11 enters the liftable injection head 8 through the gooseneck bracket 5. The liftable injection head 8 clamps and straightens the velocity string 11. When the liftable injection head 8 is working, it simultaneously controls the upper blowout preventer 9 and the lower blowout preventer 10 to ensure that the velocity string 11 is safely injected into the gas well.

[0042] Step 2: Start the motor 1-14 via the control cable 15 built into the velocity string 11. After the motor 1-14 starts, it drives the coupling 1-13 to rotate via the drive shaft. The coupling 1-13 drives the trapezoidal threaded screw 1-10 to rotate. The throttling adjustment rod 1-8 moves up and down relative to the outer sleeve 1-6 under the rotation of the trapezoidal threaded screw 1-10, thereby adjusting the gap of the flow passage between the valve disc 1-5 and the valve seat 1-4. Under the adjustment of the flow passage gap, the flow rate and pressure of the downhole fluid change, so as to achieve the purpose of throttling the fluid entering the inner cavity of the electric throttling valve 1 through the air inlet 1-2. The throttled fluid is then transported to the surface process through the gas delivery passage 13 in the velocity string 11.

[0043] The electric throttling gas production process of this invention can automatically adjust the flow area of ​​the electric throttling valve 1 nozzle according to the gas well production and pressure control needs, thereby adjusting the gas flow rate and the critical liquid carrying flow rate of the gas well, eliminating downhole liquid accumulation or slowing downhole liquid accumulation, extending the gas well's self-flowing cycle, and improving the gas well's production efficiency.

Claims

1. A velocity tubing-driven electric throttling gas extraction system, characterized in that, The system includes a take-up and take-down mechanism (4) with a speed tube (11) wound around it. The speed tube (11) passes through a gooseneck bracket (5) and is connected to an electric throttle valve (1). The gooseneck bracket (5) is connected to a frame (12) via a hinge support frame (7). The hinge support frame (7) is fixedly connected to the frame (12). The velocity tube (11) has a single gas delivery channel (13) along the axial direction. The velocity tube (11) is also threaded with a pair of carbon fiber rod cables (14) along the axial direction. The pair of carbon fiber rod cables (14) are respectively equipped with a control cable (15) and a pressure and temperature monitoring optical fiber (16). The electric throttle valve (1) includes an outer sleeve (1-6) and a motor sleeve (1-15) connected by threads. Both the outer sleeve (1-6) and the motor sleeve (1-15) are hollow cylindrical. The outer sleeve (1-6) has a wiring hole (1-11) along the axial direction. Inside the outer sleeve (1-6), from top to bottom, are a valve seat (1-4), a valve disc (1-5), a throttle adjustment rod (1-8), and a trapezoidal threaded screw (1-10). The outer sleeve (1-6) corresponds to... An air inlet (1-2) is provided at the valve seat (1-4). A flow passage is formed between the valve disc (1-5) and the valve seat (1-4) to throttle the fluid entering through the air inlet (1-2). A wave spring a (1-7) is provided on the outside of the throttling adjustment rod (1-8) to limit the upward movement of the throttling adjustment rod (1-8). A wave spring b (1-9) is provided on the outside of the trapezoidal threaded screw (1-10) to buffer the downward force of the throttling adjustment rod (1-8). The trapezoidal threaded screw (1-10) is connected to a coupling (1-13), which is connected to a motor (1-14) via a transmission shaft. Both the coupling (1-13) and the motor (1-14) are located inside a motor sleeve (1-15). A pressure stabilizing cover (1-17) is threadedly connected to the end of the motor sleeve (1-15) away from the outer sleeve (1-6). A capsule respirator (1-16) is snapped into place at the connection between the motor sleeve (1-15) and the pressure stabilizing cover (1-17). An annular cavity hole (1-1) is provided on the capsule respirator (1-16) away from the motor (1-14).

2. The velocity tubing electric throttling gas extraction system according to claim 1, characterized in that, Rubber sealing rings are provided at the connection between the outer sleeve (1-6) and the motor sleeve (1-15) and at the connection between the motor sleeve (1-15) and the voltage stabilizer cover (1-17).

3. The velocity tubing electric throttling gas extraction system according to claim 2, characterized in that, A wiring sealing plug (1-3) is provided inside the wiring hole (1-11), and a rubber sealing ring is fitted over the wiring sealing plug (1-3).

4. The velocity tubing electric throttling gas extraction system according to claim 3, characterized in that, The trapezoidal threaded screw (1-10) is sleeved with a motor pressure sleeve (1-12), which is located at one end inside the motor sleeve (1-15).

5. The velocity tubing electric throttling gas production system according to any one of claims 1 to 4, characterized in that, The frame (12) is connected to a support cylinder (6) by a pin, and the other end of the support cylinder (6) is pinned to the side wall of the hinge support frame (7); the hinge support frame (7) is provided with a liftable injection head (8), the speed column (11) passes through the liftable injection head (8), and the speed column (11) is also fitted with an upper blowout preventer (9) and a lower blowout preventer (10).

6. The velocity tubing electric throttling gas extraction system according to claim 5, characterized in that, The frame (12) is also equipped with a hydraulic workstation (2) and a control room (3). The hydraulic workstation (2) is connected to the electric throttle valve (1) through a pressure and temperature monitoring fiber (16). The control room (3) is connected to the motor (1-14) through a control cable (15) passing through the wiring hole (1-11).

7. A velocity tubing-based electrically throttling gas extraction process, characterized in that, The specific steps of using the velocity tubing electric throttling gas collection system as described in claim 6 are as follows: Step 1: One end of the velocity string (11) is connected to the electric throttle valve (1), and the retraction mechanism (4) releases the velocity string (11). The velocity string (11) enters the liftable injection head (8) through the gooseneck support (5). The liftable injection head (8) clamps and straightens the velocity string (11). When the liftable injection head (8) is working, it simultaneously controls the upper blowout preventer (9) and the lower blowout preventer (10) to ensure that the velocity string (11) is safely injected into the gas well. Step 2: Start the motor (1-14) through the control cable (15) built into the velocity string (11). The downhole fluid enters the inner cavity through the air inlet (1-2). Adjust the flow passage gap so that the fluid enters the gas transmission passage (13) through the air inlet (1-2) and is transported to the surface.

8. The velocity tubing electric throttling gas extraction process according to claim 7, characterized in that, In step 2, after the motor (1-14) starts, it drives the coupling (1-13) to rotate through the transmission shaft. The coupling (1-13) drives the trapezoidal threaded screw (1-10) to rotate. The throttling adjustment rod (1-8) moves up and down relative to the outer sleeve (1-6) under the rotation of the trapezoidal threaded screw (1-10), thereby adjusting the flow passage gap between the valve disc (1-5) and the valve seat (1-4), and the fluid entering through the air inlet (1-2) is throttled.

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