A wireless remote intelligent monitoring and multi-level regulation downhole choke

Abstract

The present invention discloses a wireless remote intelligent monitoring and multi-stage regulating downhole throttle, which includes an anchoring and sealing mechanism, a multi-stage throttling mechanism, and a downhole power generation module; the anchoring and sealing mechanism includes a rubber barrel, a rubber barrel extrusion cylinder, a pushing slip, a slip seat, a slip, a self-locking C-ring, and a sealing ring; the multi-stage throttling mechanism includes a throttling connector, a fixed throttle nozzle, a control integration outer cylinder, an ultra-low frequency electromagnetic wave control integration, a threaded sliding sleeve, a hollow shaft motor, a battery short circuit, and a moving throttle nozzle; the downhole power generation module includes a generator and a turbine shaft. The beneficial effects of the present invention are that by adjusting the position of the threaded sliding sleeve on the moving throttle nozzle, the cross-sectional area of natural gas flow is dynamically regulated for primary throttling, and a fixed throttle nozzle is used for secondary throttling, so as to achieve multi-stage precise regulation of the flow rate and pressure of the produced natural gas; ultra-low frequency electromagnetic wave communication control and downhole turbine power generation are used for continuous power supply to realize remote wireless real-time monitoring and control of the working state and operation parameters of the throttle.

Description

Technical Field

[0001] The present invention relates to the field of equipment for the combined production of natural gas extraction, gas storage injection and production, and natural gas hydrates, and particularly relates to a wireless remote intelligent monitoring and multi-stage regulation downhole choke valve. Background Art

[0002] Natural gas is a clean, efficient, and low-carbon fossil energy source that exists in gaseous form or as natural gas hydrates. Compared with conventional fossil energy sources such as coal and crude oil, when releasing 10,000 kcal of heat, the CO 2 emissions produced by the combustion of natural gas are 65.8% of the CO 2 emissions produced by the combustion of crude oil, and the carbon emission reduction is 1 / 3; it is 46.5% of the CO 2 emissions produced by the combustion of standard coal, and the carbon emission reduction reaches more than 50%.

[0003] During the development of natural gas, if the produced natural gas contains a certain amount of water and is under high pressure and low temperature conditions, during the process of the natural gas being produced to the ground, it is extremely easy to form hydrates, causing blockages in the production tubing and gas transmission pipelines, thus affecting the production of gas wells, and more seriously, it may cause safety accidents. The downhole throttling technology is to place a downhole choke valve at an appropriate position in the tubing, use a choke nozzle to achieve throttling and pressure reduction in the wellbore, and use the geothermal temperature to heat the low-temperature natural gas after throttling to reduce the temperature and pressure of the natural gas, thereby preventing the formation of natural gas hydrates. However, the existing downhole choke valves all have many deficiencies, especially most of them cannot achieve multi-stage regulation to meet the requirements of different well conditions.

[0004] Gas storage is a project to ensure the safe and stable supply of China's energy to cope with the sudden situation of providing energy supply to the country. During the construction and operation of the gas storage, it is necessary to achieve efficient operation of the injection and production wells under the condition of ensuring the safety of the wellbore in the case of large flow rate and frequent fluctuations. In the early gas storage constructed in China, the well sites adopted the process of separate injection and production, manual adjustment of injection and production gas volumes, and the installation of a vent riser and a pig launcher at the wellhead. The process was complex and the manual operation efficiency was low. Therefore, it is imperative to achieve throttling and status monitoring during the downhole injection and production of the gas storage.

[0005] At present, China has carried out three rounds of offshore hydrate trial production projects. In 2017, the pressure reduction method was used to extract hydrates, and continuous gas testing and ignition were carried out for 60 days, with a cumulative gas production of 30.9×10 4 m 3 , creating a world record for the longest continuous gas production time. In May of the same year, the world's first marine hydrate solid fluidization trial production was successfully implemented in the Shenhu sea area, with a recovery rate of 80.1%. In the third round of hydrate trial production in 2020, during the 30-day continuous gas production test, the cumulative gas production was 86.14×10 4 m 3, with a daily average gas production of 2.87×10 4 m 3 , the three hydrate test productions were successful, but their production capacity still could not reach the commercial exploitation level. The equipment utilization rate was low during the test production process, and the cost was high. However, the analysis and research of the natural gas hydrate samples found so far show that there are free gas and shallow gas under the natural gas hydrate reservoirs, and conventional gas fields are often accompanied near the natural gas hydrates. The three gas sources may often come from the common source rock. Therefore, in order to increase the natural gas production capacity, make full use of the use value of the exploitation equipment, and reduce the exploitation economic cost, Chinese scholars innovatively proposed the idea of vertical three-dimensional development of natural gas hydrates, shallow gas, and deep gas. One of the core tools is the layered throttling and multi-stage regulation tool for the combined production of three gases. However, the existing throttling and production allocation and other related tools currently cannot meet the requirements.

[0006] Therefore, in order to realize the commercial exploitation of marine natural gas hydrates in China and provide support for the formation of a complete large-scale and commercial exploitation engineering technology equipment for hydrates, the invented remote wireless multi-stage regulation downhole throttle needs to meet the following requirements and functions:

[0007] 1. It has the downhole throttling function, and the flow rate and pressure of the produced natural gas can be dynamically regulated in multiple stages to meet the characteristics of different gas-producing horizons and the reasonable production allocation requirements of the overall operation.

[0008] 2. It meets the requirements of natural gas exploitation, gas injection and production in gas storage reservoirs, or the combined production process of three gases of natural gas hydrates. The tool can be flexibly installed at any required gas-producing horizon and different depths in the wellbore, so as to carry out layered regulation on different horizons;

[0009] 3. It has the function of wireless remote control and monitoring, and the opening of the downhole throttle can be remotely wirelessly adjusted, and the operation parameters such as the opening of the throttle, the inlet and outlet flow rates, pressure, and temperature can be monitored in real time.

[0010] 4. It has the function of downhole autonomous power generation, so as to ensure that the tool can work continuously underground for a long time, reduce operations such as tripping the pipe string and reinstalling the tool, and reduce the overall operation difficulty and cost.

[0011] Therefore, it is necessary to invent a wireless remote intelligent monitoring and multi-stage regulation downhole throttle to realize the above functions, remotely regulate the flow rate and pressure of the produced natural gas in multiple stages, and dynamically monitor the opening, flow rate, pressure, temperature, etc. of the throttle, so as to effectively meet the requirements of natural gas exploitation, gas injection and production in gas storage reservoirs, and the combined production process of three gases of natural gas hydrates. Summary of the Invention

[0012] The object of the present invention is to propose a wireless remote intelligent monitoring and multi-stage control downhole throttle to solve the problems in the multi-gas vertical three-dimensional combined production process of natural gas hydrates, shallow gas, and deep gas, such as remotely and efficiently regulating the flow rate and pressure of the produced natural gas in a convenient stratified manner, throttling the produced natural gas, and meeting the requirements of natural gas production, gas injection and production in gas storage reservoirs, and the three-gas combined production process. The present invention anchors the tool on the casing through an anchoring and sealing mechanism to install the downhole throttle at different required horizons; adjusts the opening of the through-hole at the lower part of the moving throttle nozzle by axially moving the threaded sliding sleeve on the moving throttle nozzle, changes the cross-sectional area of the natural gas flow channel, and realizes the regulation of the flow rate and pressure of the produced natural gas and the regulation of the gas injection and production flow rate in the gas storage reservoir; controls the opening adjustment of the threaded sliding sleeve through ultra-low frequency electromagnetic waves on the ground to achieve remote, efficient, and convenient control; monitors the working parameters such as the pressure, flow rate, and temperature of the natural gas before and after throttling and the opening of the through-hole of the moving throttle nozzle in real time through sensor integration and displacement sensors; and generates electricity through the downhole power generation module using the produced natural gas passing through the turbine shaft to supply power to the control module of the downhole throttle and extend the downhole working time of the downhole throttle.

[0013] The technical solution adopted by the present invention for solving its technical problems is as follows: A wireless remote intelligent monitoring and multi-stage control downhole throttle, which is composed of an anchoring and sealing mechanism, a multi-stage throttling mechanism, and a downhole power generation module;

[0014] The anchoring and sealing mechanism is composed of a fishing joint, a rubber barrel, a rubber barrel extrusion cylinder, a pushing slip, a slip seat, a slip, a self-locking C-ring, and a sealing ring. The fishing joint is connected to the running tool. The rubber barrel is sleeved on the fishing joint. The rubber barrel extrusion cylinder is sleeved on the fishing joint and installed below the rubber barrel. The pushing slip is sleeved between the fishing joint and the rubber barrel extrusion cylinder. The slip seat is sleeved on the fishing joint. The slip is installed in the slip seat. The self-locking C-ring is installed on the pushing slip. The sealing ring is installed on the rubber barrel extrusion cylinder;

[0015] The multi-stage throttling mechanism consists of a throttling connector, a fixed throttling nozzle, a control integrated outer cylinder, an ultra-low frequency electromagnetic wave control integration, a threaded sliding sleeve, a hollow shaft motor, a battery short circuit, a moving throttling nozzle, a battery outer cylinder, a motor outer cylinder, a connecting cylinder, a shear pin, a sensor integration I, and a sensor integration II. The throttling connector is installed between the fishing joint and the slip seat. The shear pin is installed between the fishing joint and the throttling connector. The fixed throttling nozzle is installed on the inner side of the lower part of the throttling connector through threads. The control integrated outer cylinder is installed under the throttling connector through threads. The moving throttling nozzle is installed under the fixed throttling nozzle through threads. Inside the control integrated outer cylinder, the connecting cylinder is installed under the control integrated outer cylinder through threaded connection. The ultra-low frequency electromagnetic wave control integration is sleeved inside the control integrated outer cylinder and the connecting cylinder. The motor outer cylinder is installed under the connecting cylinder through threaded connection. The inner rotor of the hollow shaft motor is provided with a trapezoidal thread groove. The hollow shaft motor is installed inside the connecting cylinder and the motor outer cylinder. The battery outer cylinder is installed under the motor outer cylinder through threaded connection. The battery short circuit is installed inside the motor outer cylinder and the battery outer cylinder. The outer part of the threaded sliding sleeve is provided with trapezoidal threads. The threaded sliding sleeve is sleeved on the moving throttling nozzle. The trapezoidal threads are installed in cooperation with the trapezoidal thread groove inside the hollow shaft motor. The sensor integration I is installed on the throttling connector. The sensor integration II is installed on the battery outer cylinder;

[0016] The downhole power generation module consists of a generator, a generator outer cylinder, a coupling, a turbine shaft, and a turbine shaft outer cylinder. The generator outer cylinder is installed under the battery outer cylinder through threaded connection. The generator is mounted inside the generator outer cylinder. The turbine shaft outer cylinder is installed under the generator outer cylinder through threaded connection. The turbine shaft is mounted inside the turbine shaft outer cylinder. The coupling is installed between the generator and the turbine shaft.

[0017] Further, the upper part of the fishing joint is provided with a circular boss I, the middle upper part is circumferentially provided with a circular through hole, the lower part is provided with a circular boss II, and the lower part is circumferentially provided with a threaded hole I.

[0018] Further, the inner side of the upper part of the rubber cylinder extrusion cylinder is provided with a circular boss III, the inner side of the upper part is provided with a circular groove I, and the inner side of the middle part is provided with a circular groove II.

[0019] Further, the upper part of the push slip is provided with a circular groove III, the middle part is provided with a circular groove IV, and the lower part is provided with a conical surface.

[0020] Further, the outer side of the upper end of the moving throttling nozzle is provided with a circular boss IV, the inner side of the upper end is provided with a connecting thread, and the lower part is circumferentially provided with a rectangular through hole.

[0021] Further, the external trapezoidal thread of the threaded sliding sleeve is matched with the trapezoidal thread groove on the inner side of the hollow shaft motor rotor. The rotation of the hollow shaft motor rotor drives the threaded sliding sleeve to axially slide on the moving throttle nozzle, thereby adjusting the opening degree of the rectangular through hole.

[0022] Further, a displacement sensor is provided in the ultra-low frequency electromagnetic wave control integration to monitor the axial movement distance of the threaded sliding sleeve.

[0023] Further, natural gas passes through the turbine shaft, driving the turbine shaft to rotate. The rotation of the turbine shaft drives the generator.

[0024] The present invention also provides a method for using a wireless remote intelligent monitoring and multi-stage regulation downhole throttle, which includes the following steps:

[0025] Sa. Lower the tool, and send the feeding tool and the remote control layered pressure control and production adjustment downhole throttle to the predetermined position.

[0026] Sb. Anchor and set the packer. After the tool is sent to the predetermined position, drop the steel ball and inject drilling fluid into the tool. The drilling fluid is blocked by the steel ball and enters the annular space between the rubber barrel extrusion cylinder and the push slip through the circular through hole in the upper part of the fishing joint. The drilling fluid pushes the push slip shaft to move downward, pushing the rubber barrel extrusion cylinder shaft to move upward. The push slip pushes the push slip out to anchor on the casing. The rubber barrel extrusion cylinder squeezes the rubber barrel to compress and expand radially to contact the casing. The push slip and the rubber barrel extrusion cylinder move axially relative to each other. When the self-locking C-ring installed on the upper part of the push slip is aligned with the inner annular groove II in the middle of the rubber barrel extrusion cylinder, the self-locking C-ring is no longer squeezed and expands into the annular groove II. At this time, the push slip and the rubber barrel extrusion cylinder no longer move axially relative to each other, completing the anchoring and sealing of the downhole throttle.

[0027] Sc. Remove the feeding tool. After the downhole throttle completes anchoring and sealing, stop injecting drilling fluid into the tool, and remove the feeding tool and the steel ball.

[0028] Sd. Control the pressure and adjust the production. When the downhole throttle is installed and starts to work, when adjusting the flow rate and pressure of natural gas in the well according to the needs of the production process, the ground control system sends an instruction to the downhole throttle through ultra-low frequency electromagnetic waves. The ultra-low frequency electromagnetic wave control integration receives the instruction and processes the instruction to control the rotation of the hollow shaft motor rotor, driving the threaded sliding sleeve to move axially, adjusting the opening degree of the rectangular through hole at the lower part of the moving throttle nozzle, and adjusting the flow rate and pressure of natural gas.

[0029] Se, retrieving tool. When the downhole throttle needs to be retrieved after completing its work, lower the fishing tool, connect it to the fishing joint, and lift the fishing tool. The fishing tool drives the fishing joint to cut the shear pin. The fishing joint moves axially upward, driving the pushing slip axially upward. The pushing slip drives the self-locking C-ring to disengage from the annular groove II. The slip is no longer squeezed by the pushing slip and releases the anchored state. The rubber barrel rebounds and recovers without being squeezed by the rubber barrel extrusion cylinder, releasing the sealed state. Continue to lift the fishing tool to retrieve the downhole throttle.

[0030] Beneficial effects

[0031] Due to the adoption of the above technical solutions, the beneficial technical effects achieved by the present invention are as follows:

[0032] (1) Through different opening degrees of the fixed throttle nozzle and the lower rectangular through-hole of the moving throttle nozzle, the present invention forms multi-stage throttling of natural gas, and the throttling effect is more efficient. The anchor and packer mechanism enables installation at any layer required for natural gas production, gas storage injection and production, and multi-gas combined production processes.

[0033] (2) By using the ground control system to control the integrated transmission of ultra-low frequency electromagnetic wave commands for the ultra-low frequency electromagnetic wave, the ultra-low frequency electromagnetic wave control integration controls the rotation of the hollow shaft motor to drive the threaded sleeve to move axially on the moving throttle nozzle, adjusts the opening degree of the lower rectangular through-hole of the moving throttle nozzle, changes the cross-sectional area of the output natural gas flow channel, and further regulates the output natural gas flow rate, pressure, and gas storage injection and production flow rate to meet the requirements of gas production allocation for multi-gas vertical three-dimensional combined production processes of natural gas hydrates, shallow gas, and deep gas, and efficient gas storage injection and production, realizing remote, convenient, and efficient control of the downhole throttle.

[0034] (3) Through the sensor integration and displacement sensor, the operation parameters such as natural gas flow rate, pressure, and temperature before and after throttling, and the opening degree of the through-hole of the moving throttle nozzle are monitored in real time, facilitating the adjustment of the output natural gas and the gas injection flow rate of the gas storage by the process. The output natural gas is used to generate electricity through the downhole power generation module to supply power to the multi-stage throttling mechanism of the downhole throttle, realizing self-power supply of the downhole throttle, enabling the tool to work continuously underground for a long time, and reducing the overall operation difficulty and cost. Description of the drawings

[0035] Figure 1 It is a cross-sectional view of the tool of the present invention;

[0036] Figure 2 It is a schematic structural diagram of the fishing joint of the present invention;

[0037] Figure 3 It is a schematic structural diagram of the rubber barrel extrusion cylinder of the present invention;

[0038] Figure 4 It is a schematic structural diagram of the pushing slip of the present invention;

[0039] Figure 5 Schematic diagram of the moving throttle nozzle structure of the present invention;

[0040] Figure 6 Schematic diagram of the hollow shaft motor structure of the present invention;

[0041] Figure 7 Schematic diagram of the appearance of the threaded sliding sleeve of the present invention;

[0042] Figure 8 Schematic diagram of the fully open state of the moving throttle nozzle of the present invention;

[0043] Figure 9 Schematic diagram of the 1 / 4 opening state of the moving throttle nozzle of the present invention;

[0044] Figure 10 Schematic diagram of the half-opening state of the moving throttle nozzle of the present invention;

[0045] Figure 11 Schematic diagram of the 3 / 4 opening state of the moving throttle nozzle of the present invention;

[0046] Figure 12 Schematic diagram of the fully closed state of the moving throttle nozzle of the present invention;

[0047] Figure 13 Flow chart of the usage method of the tool of the present invention;

[0048] In the figure, 1 - fishing joint, 2 - rubber cylinder, 3 - rubber cylinder extrusion cylinder, 4 - pushing slip, 5 - slip seat, 6 - slip, 7 - throttle connection head, 8 - fixed throttle nozzle, 9 - control integrated outer cylinder, 10 - ultra-low frequency electromagnetic wave control integration, 11 - threaded sliding sleeve, 12 - hollow shaft motor, 13 - battery short circuit, 14 - moving throttle nozzle, 15 - generator, 16 - generator outer cylinder, 17 - coupling, 18 - turbine shaft, 19 - turbine shaft outer cylinder, 20 - battery outer cylinder, 21 - motor outer cylinder, 22 - connecting cylinder, 23 - shear pin, 24 - self-locking C-ring, 25 - sealing ring, 26 - sensor integration Ⅰ, 27 - sensor integration Ⅱ, 101 - annular boss Ⅰ, 102 - circular through hole, 103 - annular boss Ⅱ, 104 - threaded hole Ⅰ, 301 - annular boss Ⅲ, 302 - annular groove Ⅰ, 303 - annular groove Ⅱ, 401 - annular groove Ⅲ, 402 - annular groove Ⅳ, 403 - conical surface, 1101 - trapezoidal thread, 1201 - trapezoidal thread groove, 1401 - annular boss Ⅳ, 1402 - connecting thread, 1403 - rectangular through hole. Detailed implementation manners

[0049] The following further describes the present invention with reference to the accompanying drawings. The protection scope of the present invention is not limited to the following description:

[0050] AsFigures 1-13, a wireless remote intelligent monitoring and multi-stage regulating downhole throttle, which consists of an anchoring and sealing mechanism, a multi-stage throttling mechanism, and a downhole power generation module; the anchoring and sealing mechanism consists of a fishing joint 1, a rubber barrel 2, a rubber barrel extrusion barrel 3, a push slip 4, a slip seat 5, slips 6, a self-locking C-ring 24, and a sealing ring 25. The upper part of the fishing joint 1 is provided with an annular boss Ⅰ101, a circular through hole 102 is circumferentially provided in the upper middle part, the lower part is provided with an annular boss Ⅱ103, and a threaded hole Ⅰ104 is circumferentially provided in the lower part. The rubber barrel 2 is sleeved on the fishing joint 1, and the upper part of the rubber barrel 2 contacts the lower part of the annular boss Ⅰ101. The inner side of the upper part of the rubber barrel extrusion barrel 3 is provided with an annular boss Ⅲ301, an annular groove Ⅰ302 is provided on the inner side of the upper part, and an annular groove Ⅱ303 is provided on the inner side of the middle part. The rubber barrel extrusion barrel 3 is sleeved on the fishing joint 1 and installed under the rubber barrel 2. The upper part of the push slip 4 is provided with an annular groove Ⅲ401, an annular groove Ⅳ402 is provided in the middle part, and a conical surface 403 is provided in the lower part. The push slip 4 is sleeved between the fishing joint 1 and the rubber barrel extrusion barrel 3. The slip seat is sleeved on the fishing joint 1 and installed under the rubber barrel extrusion barrel 3. The slips 6 are installed in the slip seat 5. The self-locking C-ring 24 is installed in the annular groove Ⅲ401 of the push slip 4. The sealing ring 25 is installed in the annular groove Ⅰ302 of the rubber barrel extrusion barrel 3. The multi-stage throttling mechanism consists of a throttling connector 7, a fixed throttle nozzle 8, a control integration outer cylinder 9, an ultra-low frequency electromagnetic wave control integration 10, a threaded sliding sleeve 11, a hollow shaft motor 12, a battery short circuit 13, a moving throttle nozzle 14, a battery outer cylinder 20, a motor outer cylinder 21, a connecting cylinder 22, a shear pin 23, a sensor integration Ⅰ26, and a sensor integration Ⅱ27. The throttling connector 7 is installed between the fishing joint 1 and the slip seat 5. The shear pin 23 is installed on the fishing joint 1 and the throttling connector 7. The fixed throttle nozzle 8 is installed on the inner side of the lower part of the throttling connector 7 by thread. The control integration outer cylinder 9 is installed under the throttling connector 7 by thread. The outer side of the upper end of the moving throttle nozzle 14 is provided with an annular boss Ⅳ1401, a connecting thread 1402 is provided on the inner side of the upper end, and a rectangular through hole 1403 is circumferentially provided at the lower end. The moving throttle nozzle 14 is installed under the fixed throttle nozzle 8 by thread. Natural gas enters the inside of the moving throttle nozzle 14 through the rectangular through hole 1403 at the lower part of the moving throttle nozzle 14;Inside the control integration outer cylinder 9, the connecting cylinder 22 is installed under the control integration outer cylinder 9 by threaded connection. A displacement sensor is provided in the ultra-low frequency electromagnetic wave control integration 10 to monitor the axial movement distance of the threaded sliding sleeve 11. The ultra-low frequency electromagnetic wave control integration 10 is sleeved inside the control integration outer cylinder 9 and the connecting cylinder 22. The motor outer cylinder 21 is installed under the connecting cylinder 22 by threaded connection. A trapezoidal thread groove 1201 is provided on the inner rotor of the hollow shaft motor 12. The hollow shaft motor 12 is installed inside the connecting cylinder 22 and the motor outer cylinder 21. The battery outer cylinder 20 is installed under the motor outer cylinder 21 by threaded connection. The battery short circuit 13 is installed inside the motor outer cylinder 21 and the battery outer cylinder 20. A trapezoidal thread 1101 is provided on the outside of the threaded sliding sleeve 11. The threaded sliding sleeve 11 is sleeved on the moving throttle 14. The trapezoidal thread 1101 is installed in cooperation with the trapezoidal thread groove 1201 inside the hollow shaft motor 12. The trapezoidal thread 1101 cooperates with the trapezoidal thread groove 1201 on the inner side of the rotor of the hollow shaft motor 12. The rotation of the rotor of the hollow shaft motor 12 drives the threaded sliding sleeve 11 to axially slide on the moving throttle 14 to adjust the opening of the rectangular through hole 1403 at the lower part of the moving throttle 14. The sensor integration I 26 is installed on the throttle connector 7. The sensor integration II 27 is installed on the battery outer cylinder 20. The downhole power generation module is composed of a generator 15, a generator outer cylinder 16, a coupling 17, a turbine shaft 18, and a turbine shaft outer cylinder 19. The generator outer cylinder 16 is installed under the battery outer cylinder 20 by threaded connection. The generator 15 is mounted inside the generator outer cylinder 16. The turbine shaft outer cylinder 19 is installed under the generator outer cylinder 16 by threaded connection. The turbine shaft 18 is mounted inside the turbine shaft outer cylinder 19. The coupling 17 is installed between the generator 15 and the turbine shaft 18. Natural gas passes through the turbine shaft 18, driving the turbine shaft 18 to rotate. The rotation of the turbine shaft 18 drives the generator 15 to generate electricity to supply power to the multi-stage throttling mechanism.;

[0051] The present invention also provides a method for using a wireless remote intelligent monitoring and multi-stage regulation downhole throttle, which includes the following steps:

[0052] Sa. Lower the tool, and send the feeding tool and the remote control stratified pressure control and production adjustment downhole throttle to the predetermined position;

[0053] Sb. Anchor and set in place. Wait for the tool to be sent to the predetermined position, drop the steel ball and inject drilling fluid into the tool. Due to the pressure buildup caused by the steel ball, the drilling fluid enters the annulus space between the rubber barrel extrusion barrel 3 and the push slip 4 through the circular through-hole 102 in the upper-middle part of the fishing joint 1. The drilling fluid pushes the push slip 4 to move axially downward, pushing the rubber barrel extrusion barrel 3 to move axially upward. The push slip 4 pushes the slip 6 to extend and anchor on the casing. The rubber barrel extrusion barrel 3 squeezes the rubber barrel 2 to compress and radially expand to contact the casing. The push slip 4 and the rubber barrel extrusion barrel 3 move axially relative to each other. When the self-locking C-ring 24 installed on the upper part of the push slip 4 aligns with the inner annular groove II 303 in the middle of the rubber barrel extrusion barrel 3, the self-locking C-ring 24 is no longer squeezed and expands into the annular groove II 303. At this time, the push slip 4 and the rubber barrel extrusion barrel 3 no longer move axially relative to each other, completing the anchoring and sealing of the downhole throttle valve;

[0054] Sc. Remove the delivery tool. When the downhole throttle valve completes anchoring and sealing, stop injecting drilling fluid into the tool and remove the delivery tool and the steel ball;

[0055] Sd. Control pressure and adjust production. When the downhole throttle valve is installed and starts to work, when adjusting the natural gas flow rate and pressure in the well according to the needs of the production process, the surface control system sends commands to the downhole throttle valve through ultra-low frequency electromagnetic waves. The ultra-low frequency electromagnetic wave control integration 10 receives the commands and processes the commands to control the rotation of the rotor of the hollow shaft motor 12, driving the threaded slip 11 to move axially, adjusting the opening of the rectangular through-hole 1403 below the moving throttle nozzle 14, and adjusting the natural gas flow rate and pressure;

[0056] Se. Remove the tool. When the downhole throttle valve needs to be removed after completing the work, lower the fishing tool, connect it to the fishing joint 1, lift the fishing tool. The fishing tool drives the fishing joint 1 to cut the shear pin 23. The fishing joint 1 moves axially upward, driving the push slip 4 to move axially upward. The push slip 4 drives the self-locking C-ring 24 to disengage from the annular groove II 303. The slip 6 is no longer squeezed by the push slip 4 and releases the anchored state. The rubber barrel 2 is no longer squeezed by the rubber barrel extrusion barrel 3 and rebounds to restore, releasing the sealed state. Continue to lift the fishing tool to remove the downhole throttle valve.

[0057] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, based on the above description, other different forms of changes or variations can be made. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A wireless remote intelligent monitoring and multi-stage regulating downhole choke, which is composed of an anchoring and sealing mechanism, a multi-stage throttling mechanism, and a downhole power generation module; The anchoring and sealing mechanism consists of a fishing joint (1), a rubber barrel (2), a rubber barrel extrusion barrel (3), a push slip (4), a slip seat (5), a slip (6), a self-locking C-ring (24), and a sealing ring (25). The fishing joint (1) is connected to a running tool. The rubber barrel (2) is sleeved on the fishing joint (1). The rubber barrel extrusion barrel (3) is sleeved on the fishing joint (1) and installed below the rubber barrel (2). The push slip (4) is sleeved between the fishing joint (1) and the rubber barrel extrusion barrel (3). The slip seat (5) is sleeved on the fishing joint (1) and installed below the rubber barrel extrusion barrel (3). The slip (6) is installed in the slip seat (5). The self-locking C-ring (24) is installed on the push slip (4). The sealing ring (25) is installed on the rubber barrel extrusion barrel (3); The multi-stage throttling mechanism consists of a throttling connector (7), a fixed throttle nozzle (8), a control integrated outer cylinder (9), an ultra-low frequency electromagnetic wave control integration (10), a threaded sliding sleeve (11), a hollow shaft motor (12), a battery short circuit (13), a moving throttle nozzle (14), a battery outer cylinder (20), a motor outer cylinder (21), a connecting cylinder (22), a shear pin (23), a sensor integration I (26), and a sensor integration II (27). The throttling connector (7) is installed between the fishing joint (1) and the slip seat (5). The shear pin (23) is installed on the fishing joint (1) and the throttling connector (7). The fixed throttle nozzle (8) is installed on the inner side of the lower part of the throttling connector (7) by means of threads. The control integrated outer cylinder (9) is installed under the throttling connector (7) by means of threads. The moving throttle nozzle (14) is installed under the fixed throttle nozzle (8) by means of threads. The moving throttle nozzle (14) is inside the control integrated outer cylinder (9). The connecting cylinder (22) is installed under the control integrated outer cylinder (9) by means of threaded connection. The ultra-low frequency electromagnetic wave control integration (10) is sleeved inside the control integrated outer cylinder (9) and the connecting cylinder (22). The motor outer cylinder (21) is installed under the connecting cylinder (22) by means of threaded connection. A trapezoidal thread groove (1201) is provided on the inner rotor of the hollow shaft motor (12). The hollow shaft motor (12) is installed inside the connecting cylinder (22) and the motor outer cylinder (21). The battery outer cylinder (20) is installed under the motor outer cylinder (21) by means of threaded connection. The battery short circuit (13) is installed inside the motor outer cylinder (21) and the battery outer cylinder (20). The external part of the threaded sliding sleeve (11) is provided with a trapezoidal thread (1101). The threaded sliding sleeve (11) is sleeved on the moving throttle nozzle (14). The trapezoidal thread (1101) is installed in cooperation with the trapezoidal thread groove (1201) inside the hollow shaft motor (12). The sensor integration I (26) is installed on the throttling connector (7). The sensor integration II (27) is installed on the battery outer cylinder (20). The downhole power generation module consists of a generator (15), a generator outer cylinder (16), a coupling (17), a turbine shaft (18), and a turbine shaft outer cylinder (19). The generator outer cylinder (16) is installed under the battery outer cylinder (20) by means of threaded connection. The generator (15) is mounted inside the generator outer cylinder (16). The turbine shaft outer cylinder (19) is installed under the generator outer cylinder (16) by means of threaded connection. The turbine shaft (18) is mounted inside the turbine shaft outer cylinder (19). The coupling (17) is installed between the generator (15) and the turbine shaft (18).

2. A wireless remote intelligent monitoring and multi-stage regulation downhole throttler according to claim 1, characterized in that: The upper part of the fishing sub (1) is provided with an annular boss I (101), a circular through-hole (102) is circumferentially arranged in the upper middle part, the lower part is provided with an annular boss II (103), and a threaded hole I (104) is circumferentially arranged in the lower part.

3. The wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to claim 1, characterized in that: The inner side of the upper part of the rubber barrel extrusion cylinder (3) is provided with an annular boss III (301), the inner side of the upper part is provided with an annular groove I (302), and the inner side of the middle part is provided with an annular groove II (303).

4. The wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to claim 1, characterized in that: The upper part of the pushing slip (4) is provided with an annular groove III (401), the middle part is provided with an annular groove IV (402), and the lower part is provided with a conical surface (403).

5. The wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to claim 1, characterized in that: An annular boss IV (1401) is arranged on the outer side of the upper end of the moving throttle nozzle (14), a connecting thread (1402) is arranged on the inner side of the upper end, and a rectangular through-hole (1403) is circumferentially arranged at the lower end.

6. The wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to claim 5, characterized in that: The external trapezoidal thread (1101) of the threaded sliding sleeve (11) cooperates with the trapezoidal thread groove (1201) on the inner side of the rotor of the hollow shaft motor (12). The rotation of the rotor of the hollow shaft motor (12) drives the threaded sliding sleeve (11) to axially slide on the moving throttle nozzle (14) to adjust the opening degree of the rectangular through-hole (1403).

7. The wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to claim 1, characterized in that: A displacement sensor is arranged in the ultra-low frequency electromagnetic wave control integration (10) to monitor the axial movement distance of the threaded sliding sleeve (11).

8. The wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to claim 1, characterized in that: Natural gas passes through the turbine shaft (18) to drive the turbine shaft (18) to rotate, and the rotation of the turbine shaft (18) drives the generator (15) to generate electricity.

9. The usage method of the wireless remote intelligent monitoring and multi-stage regulating downhole throttle according to any one of claims 1 to 8, characterized in that: It includes the following steps: Sa. Lower the tool, and send the feeding tool and the remotely controlled stratified pressure control and production adjustment downhole throttle to the predetermined position; Sb. Anchor and set in place. Wait until the tool is sent to the predetermined position, drop the steel ball and inject drilling fluid into the tool. The drilling fluid is blocked by the steel ball and enters the annulus space between the rubber barrel extrusion cylinder (3) and the push slip (4) through the circular through hole (102) in the upper and middle parts of the fishing sub (1). The drilling fluid pushes the push slip (4) to move downward axially, pushing the rubber barrel extrusion cylinder (3) to move upward axially. The push slip (4) pushes the slip (6) to extend and anchor on the casing. The rubber barrel extrusion cylinder (3) squeezes the rubber barrel (2) to compress and expand radially to contact the casing. The push slip (4) and the rubber barrel extrusion cylinder (3) move axially relative to each other. When the self-locking C-ring (24) installed on the upper part of the push slip (4) aligns with the inner annular groove II (303) in the middle of the rubber barrel extrusion cylinder (3), the self-locking C-ring (24) is no longer squeezed and expands into the annular groove II (303). At this time, the push slip (4) and the rubber barrel extrusion cylinder (3) no longer move axially relative to each other, completing the anchoring and sealing of the downhole choke; Sc. Remove the running-in tool. When the downhole choke completes anchoring and sealing, stop injecting drilling fluid into the tool and remove the running-in tool and the steel ball; Sd. Control pressure and adjust production. When the downhole choke is installed and starts to work, when adjusting the natural gas flow rate and pressure in the well according to the needs of the production process, the surface control system sends an instruction to the downhole choke through ultra-low frequency electromagnetic waves. The ultra-low frequency electromagnetic wave control integration (10) receives the instruction and processes the instruction to control the rotation of the rotor of the hollow shaft motor (12), driving the threaded slip sleeve (11) to move axially, adjusting the opening of the rectangular through hole (1403) at the lower part of the movable choke nozzle (14), and adjusting the natural gas flow rate and pressure; Se. Remove the tool. When the downhole choke needs to be removed after completing the work, lower the fishing tool, connect it to the fishing sub (1), lift the fishing tool. The fishing tool drives the fishing sub (1) to cut the shear pin (23). The fishing sub (1) moves upward axially, driving the push slip (4) to move upward axially. The push slip (4) drives the self-locking C-ring (24) to disengage from the annular groove II (303). The slip (6) is no longer squeezed by the push slip (4) and releases the anchored state. The rubber barrel (2) is no longer squeezed by the rubber barrel extrusion cylinder (3) and rebounds to restore, releasing the sealed state. Continue to lift the fishing tool to remove the downhole choke.

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