Performance testing device and method for underground throttler

Abstract

The invention relates to the technical field of petroleum and natural gas extraction, in particular to a device and a method for testing the performance of an underground throttler, and aims to solve the problems that the throttler cannot be systematically tested after leaving a factory, and the quality of the throttler is unstable in the use process. The invention provides a performance testing device for an underground throttler. The performance testing device comprises a simulation assembly, a pressing assembly, a liquid discharging assembly and a separator, the pressing assembly is communicated with the vertical pipe and is used for carrying out a pressure-bearing test; and the liquid discharging assembly and the separator are respectively communicated with two ends of the vertical pipe and are used for testing the liquid discharging efficiency. The underground environment is simulated through the simulation assembly, pressure adjustment and temperature adjustment are facilitated, the upper pressure and the lower pressure of the throttler under different temperature conditions and the drainage efficiency of a throttling air nozzle are tested through flexible switching, the testing device has the advantages of being easy to operate, efficient and low in cost, quality control of the throttler is guaranteed, and the testing device is suitable for popularization and application. And meanwhile, the stability of field use is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas exploitation, and in particular to a downhole choke performance testing device and method. Background Art

[0002] The downhole choke is used to realize the low-pressure mode production of gas wells. It relies on slip positioning, rubber cylinder sealing, and gas nozzle matching to achieve wellbore natural gas throttling and pressure reduction, and completes downhole construction operations such as choke placement, sealing, and salvage through the well test car wire.

[0003] The lower pressure, upper pressure and gas nozzle drainage efficiency of the choke during the underground application are three key indicators for judging the quality of the tool. The existing choke test device cannot perform an overall experimental device for the lower pressure, upper pressure and gas nozzle drainage efficiency of the choke, resulting in the choke not being systematically tested before leaving the factory, and the quality is prone to unstable during field application. Summary of the invention

[0004] The purpose of the present invention is to provide a downhole choke performance testing device and method to solve the problem that the choke cannot be systematically tested before leaving the factory and the quality is easily unstable during use.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A downhole throttle performance test device comprises a simulation component, a pressure component, a drainage component and a separator; the simulation component comprises a base, a riser, an outer pipe, an outer pipe cap, a pressure test cap, a heating gauge and a thermometer; the riser is inserted into the outer pipe, and the throttle is inserted into the riser; one end of the outer pipe is sleeved on the base, and the other end is connected to the outer pipe cap; one end of the riser is inserted into the base, and the other end passes through the outer pipe cap and is connected to the pressure test cap; grease is filled in the annular space between the riser and the outer pipe, the heating gauge is installed on the outer pipe for heating the grease, and the thermometer is installed on the outer pipe cap for measuring the temperature of the grease; the pressure component is connected to the riser for pressure bearing test; the drainage component and the separator are respectively connected to the two ends of the riser for drainage efficiency test.

[0007] Furthermore, the pressure test assembly includes a pressure test pump and a first switching switch valve, the pressure test pump is connected to the first switching switch valve, and the first switching switch valve is connected to the riser; the first switching switch valve switches the state to allow the pressure test pump to pressurize above or below the throttle.

[0008] Furthermore, the pressure testing component also includes a second switching valve, one end of which is connected to the base, and the other end of which is connected to the first switching valve, for controlling the connection state between the pressure test pump and the base.

[0009] Furthermore, the pressure test assembly also includes a pressure test switch valve, one end of which is connected to the pressure test cap, and the other end is connected to the first switching switch valve, which is used to control the connection state between the pressure test pump and the pressure test cap.

[0010] Furthermore, the liquid discharge assembly includes a liquid storage tank and an air source; one end of the liquid storage tank is connected to the second switching switch valve, and the other end is connected to the air source; the second switching switch valve switches the state to connect the base to the pressure test pump or the liquid storage tank.

[0011] Furthermore, the downhole throttle performance testing device also includes a hoisting assembly, which includes an I-shaped wheel reel and a fixed pulley; one end of the wire rope is wound around the I-shaped wheel reel, and the other end passes through the fixed pulley for hoisting the throttle.

[0012] Furthermore, the lifting assembly also includes a rope cap, which is connected to the end of the wire rope away from the I-spool reel, and includes a main body, an inner tube, a wedge-shaped plug, a connecting seat and a shear nail; the main body is inserted in the connecting seat, the inner tube is inserted in the main body and the connecting seat and abuts against the main body, the wedge-shaped plug is inserted in the inner tube and abuts against the inner tube, and the shear nail is inserted in the main body and the connecting seat; the wire rope is connected to the wedge-shaped plug and passes through the inner tube and the main body.

[0013] Furthermore, the lifting assembly also includes a conversion short section, one end of the conversion short section is provided with an internal thread, and the other end is provided with an external thread; one end of the conversion short section is inserted into the connecting seat and threadedly connected to the connecting seat, and the other end is connected to the throttle.

[0014] Furthermore, the hoisting assembly also includes a stand, and the I-shaped wheel reel, the fixed pulley and the base are all installed on the stand.

[0015] Another aspect of the present invention provides a method for testing the performance of a downhole choke, using the downhole choke performance testing device, comprising the following steps:

[0016] Throttle release and sealing: block the throttling nozzle of the throttle and lift the throttle through the lifting assembly and put it into the riser, then lift it up to make the rubber cylinder of the throttle pressurized and sealed and cut off the connecting pin of the throttle;

[0017] Pressure test: install the pressure test cap, connect the first switching valve and the pressure test valve, and use the pressure test pump to pressurize the pressure test cap to perform an upper pressure test; then switch the first switching valve to connect the first switching valve and the second switching valve, and use the pressure test pump to pressurize the base to perform a lower pressure test;

[0018] Liquid discharge efficiency test: open the throttling nozzle of the throttling device to discharge the liquid in the riser; switch the second switching valve to connect the liquid storage tank with the base; adjust the exhaust volume of the gas source to conduct liquid discharge efficiency tests under different gas-liquid ratio conditions.

[0019] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0020] The downhole throttle performance testing device provided by the present invention comprises a simulation component, a pressure component, a drainage component and a separator; the simulation component comprises a base, a riser, an outer pipe, an outer pipe cap, a pressure test cap, a heating meter and a thermometer; the riser is inserted into the outer pipe, and the throttle is inserted into the riser; one end of the outer pipe is sleeved on the base, and the other end is connected to the outer pipe cap; one end of the riser is inserted into the base, and the other end passes through the outer pipe cap and is connected to the pressure test cap; the annular space between the riser and the outer pipe is filled with grease, the heating meter is installed on the outer pipe for heating the grease, and the thermometer is installed on the outer pipe cap for measuring the temperature of the grease; the pressure component is connected to the riser for pressure bearing test; the drainage component and the separator are respectively connected to the two ends of the riser for drainage efficiency test.

[0021] The downhole throttle performance testing device provided by the present invention simulates the downhole environment through a simulation component, which is convenient for pressure regulation and temperature regulation, so that the upper pressure, lower pressure and drainage efficiency of the throttle nozzle under different temperature conditions of the throttle can be tested through flexible switching. It has the advantages of simple operation, high efficiency and low cost, provides a guarantee for the quality control of the throttle and ensures the stability of on-site use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a downhole choke performance testing device provided by an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the simulation component;

[0025] Figure 3 is a schematic diagram of the structure of the base;

[0026] Figure 4 It is a structural schematic diagram of the hoisting assembly;

[0027] Figure 5 It is a structural schematic diagram of the rope cap;

[0028] Figure 6 Schematic diagram of the structure of the throttle.

[0029] Icons: 100-simulation component; 300-drainage component; 400-separator; 500-hoisting component; 110-base; 120-riser; 130-outer pipe; 140-outer pipe cap; 150-pressure test cap; 160-heating meter; 170-thermometer; 180-drainage switch valve; 210-pressure test pump; 220-first switching switch valve; 230-second switching switch valve; 240-pressure test switch valve; 310-liquid storage tank; 320-air source; 510-I-wheel reel; 520-fixed pulley; 530-rope cap; 540-conversion short section; 550-stand; 531-main body; 532-inner cylinder; 533-wedge-shaped plug block; 534-connecting seat; 535-shear nail; 10-throttle; 11-delivery head; 12-connecting pin; 13-slip; 14-rubber cylinder; 15-throttling nozzle; a-annular space. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] The existing throttle test device cannot perform an overall experimental device for the lower pressure, upper pressure and discharge efficiency of the air nozzle that the throttle bears, resulting in the throttle not being systematically tested before leaving the factory, and unstable quality is prone to occur during field application.

[0034] In view of this, the present invention provides a downhole choke performance test device, including a simulation component 100, a pressure component, a drainage component 300 and a separator 400; the simulation component 100 includes a base 110, a riser 120, an outer tube 130, an outer tube cap 140, a pressure test cap 150, a heating meter 160 and a thermometer 170; the riser 120 is inserted into the outer tube 130, and the choke 10 is inserted into the riser 120; one end of the outer tube 130 is sleeved on the base 110, and the other end is connected to the outer tube cap 140; One end of the tube 120 is inserted into the base 110, and the other end passes through the outer tube cap 140 and is connected to the pressure test cap 150; the annular space a between the vertical pipe 120 and the outer tube 130 is filled with grease, the heating meter 160 is installed on the outer tube 130 for heating the grease, and the thermometer 170 is installed on the outer tube cap 140 for measuring the temperature of the grease; the pressure assembly is connected to the vertical pipe 120 for pressure testing; the drainage assembly 300 and the separator 400 are respectively connected to the two ends of the vertical pipe 120 for drainage efficiency testing.

[0035] The downhole throttle performance testing device provided by the present invention simulates the downhole environment through the simulation component 100, which is convenient for pressure regulation and temperature regulation, so that the upper pressure, lower pressure and drainage efficiency of the throttle nozzle under different temperature conditions of the throttle can be tested through flexible switching. It has the advantages of simple operation, high efficiency and low cost, provides a guarantee for the quality control of the throttle, and ensures the stability of on-site use.

[0036] The following combination Figure 1-Figure 6 The structure and shape of the downhole choke performance testing device provided in this embodiment are described in detail:

[0037] In an optional solution of this embodiment, the base 110 is provided with internal threads and external threads, the internal threads are used to connect with the standpipe 120, and the external threads are used to connect with the outer pipe 130. The base 110 is also provided with a connector for connecting with the pressure assembly and the drainage assembly 300, such as Figure 3 shown.

[0038] In this embodiment, at least two heating meters 160 are arranged along the axial direction of the outer tube 130 to ensure uniform heating of the grease in the annular space a and avoid uneven temperature. Specifically, the heating meter 160 is inserted into the grease. In addition, a heat preservation layer can be set on the outer side of the outer tube 130 for heat preservation, reducing heat loss to maintain temperature stability, and avoiding excessive heat loss that causes the heating meter 160 to be unable to heat in time. The heat preservation layer can be made of asbestos, rubber, polyurethane foam, etc. Similarly, the heating meter 160 can be replaced with a heating wire evenly wound around the outer side of the outer tube 130 to make the heating more uniform.

[0039] In this embodiment, the simulation component 100 further includes a drain switch valve 180, which is installed on the pressure test cap 150 and is used to connect with the separator 400. The pressure test cap 150 is mounted on the standpipe 120 and is provided with two connectors, which are respectively connected to the pressure test component and the pressure test cap 150. Figure 1 , Figure 2 In addition, a thermometer 170 is inserted into the annular space a to directly measure the grease temperature.

[0040] In an optional solution of this embodiment, the pressure test assembly includes a pressure test pump 210, a first switching switch valve 220, a second switching switch valve 230 and a pressure test switch valve 240. Figure 1 As shown. The second switching switch valve 230 is connected to the base 110, the pressure test switch valve 240 is connected to the pressure test cap 150, one end of the first switching switch valve 220 is connected to the pressure test pump 210, and the other end is connected to the second switching switch valve 230 and the pressure test switch valve 240 respectively. In addition, the second switching switch valve 230 is also connected to the discharge assembly 300. In this embodiment, each switch valve is selected as a solenoid valve to facilitate automatic control.

[0041] In this embodiment, the liquid discharge assembly 300 includes a liquid storage tank 310 and an air source 320. One end of the liquid storage tank 310 is connected to the second switching switch valve 230, and the other end is connected to the air source 320. Specifically, when the liquid discharge efficiency test is required, the second switching switch valve 230 switches the state so that the base 110 is connected to the liquid storage tank 310; at the same time, the liquid discharge switch valve 180 is opened to connect the pressure test cap 150 with the separator 400. When the lower pressure test is performed, the second switching switch valve 230 connects the base 110 with the first switching switch valve 220, and the first switching switch valve 220 connects the pressure test pump 210 with the second switching switch valve 230, so that the pressure test pump 210 presses the base 110. When the upper pressure test is performed, the first switching switch valve 220 switches the state so that the pressure test switch valve 240 is connected to the pressure test pump 210, so as to pressurize the pressure test cap 150.

[0042] In this embodiment, the gas source 320 can be an air pump, a compressor or a gas tank, etc., and the separator 400 is used to separate the gas-liquid mixture and measure the liquid. In addition, when used, the standpipes 120 of different specifications can be replaced to test the throttles 10 of different specifications.

[0043] In an optional solution of this embodiment, the hoisting assembly 500 includes an I-shaped wheel reel 510, a fixed pulley 520, a rope cap 530, a conversion short section 540 and a stand 550. Figure 1 , 4As shown, the base 110, the drainage assembly 300, the spool reel 510 and the fixed pulley 520 are all installed on the stand 550. Specifically, one end of the wire rope is wound around the spool reel 510, and the other end passes through the fixed pulley 520 and is connected to the rope cap 530; one end of the conversion short section 540 is inserted into the rope cap 530 and is threadedly connected to the rope cap 530, and the other end is connected to the throttle 10 for hoisting the throttle 10.

[0044] In this embodiment, the I-shaped wheel reel 510 is driven by a motor, and the motor can cooperate with a frequency converter to control the output speed; two fixed pulleys 520 are arranged in the horizontal direction to change the lifting position, and one end of the adapter short section is provided with an internal thread and the other end is provided with an external thread.

[0045] The rope cap 530 is connected to the end of the wire rope away from the spool reel 510, and includes a body 531, an inner tube 532, a wedge-shaped plug 533, a connecting seat 534 and a shear nail 535. Figure 5 As shown in the figure, the body 531 is inserted into the connection seat 534, the inner cylinder 532 is inserted into the body 531 and the connection seat 534 and abuts against the body 531, the wedge plug 533 is inserted into the inner cylinder 532 and abuts against the inner cylinder 532, and the shear nail 535 is inserted into the body 531 and the connection seat 534; the wire rope is connected to the wedge plug 533 and passes through the inner cylinder 532 and the body 531. Specifically, the inner cylinder 532 is provided with a tapered hole to cooperate with the wedge plug 533, and the wedge plug 533 is set as a truncated cone structure, and a stable connection is achieved through the cooperation of the tapered surface.

[0046] In order to facilitate the hoisting of the throttle 10, a sliding plate can be provided on the stand 550, and the base 110 is installed on the sliding plate. When the throttle 10 needs to be hoisted, the sliding plate drives the simulation component 100 to move away for hoisting; after hoisting, the sliding plate drives the simulation component 100 to reset so that the riser 120 and the throttle 10 are aligned, so as to facilitate the lowering of the throttle 10. At the same time, the sliding plate needs to be locked to ensure that it is not affected during the test.

[0047] In this embodiment, the throttle 10 includes a delivery head 11, a connecting pin 12, a slip 13, a rubber cylinder 14 and a throttling nozzle 15. Figure 6 The delivery head 11 is inserted into the conversion nipple 540 and is threadedly connected to the conversion nipple 540, the connecting pin 12 is used to connect the delivery head 11 and the lower pipe string, the slip 13 is used to bite with the pipe wall, the rubber cylinder 14 is deformed after being compressed to form a seal, and the throttling nozzle 15 is used for fluid to pass through.

[0048] In addition, when performing a pressure test, the throttling nozzle 15 needs to be blocked. At this time, a plug can be used to replace the throttling nozzle 15, but the pipe column needs to be taken out and disassembled during the test to perform the drainage efficiency test. Further, a combination of a closing sleeve, a shear pin and a pitching ball can be used to block and open the throttling nozzle 15. Specifically, the closing sleeve is inserted into the throttling device 10 and located at the throttling nozzle 15 to close the throttling nozzle 15, the shear pin is inserted into the closing sleeve and the throttling device 10 to fix the closing sleeve, and the pitching ball is arranged on the upper part of the closing sleeve and is seated on the closing sleeve to block the upper end of the closing sleeve. It should be noted that the pressure bearing capacity of the shear pin must be higher than the pressure required for the pressure test. During the test, a pressure test is performed first to ensure that the shear pin will not be sheared off. At this time, the closing sleeve can block the throttling nozzle 15. When a drainage efficiency test is required, first pressurize the pressure test cap 150 to push the ball, so that the ball pushes the closing sleeve and shears the shear pin. Then, under the action of pressure and deadweight, the closing sleeve moves downward to open the throttling nozzle 15. At this time, the upper and lower ends of the throttle 10 are connected, and the drainage efficiency test can be performed. At this time, automatic testing can be achieved.

[0049] Based on the above-mentioned downhole choke performance testing device, a downhole choke performance testing method is proposed, comprising the following steps:

[0050] Throttle release and sealing: block the throttling nozzle 15, lift the throttle 10 through the lifting assembly 500 and put it into the riser 120, and then quickly lower it. When the throttle 10 enters the riser 120 completely, reduce the lowering speed, so that the slip 13 starts and bites with the inner wall of the riser 120 for preliminary anchoring; then lift up to make the slip 13 fully open to complete the anchoring. As the lifting proceeds, the rubber cylinder 14 is compressed to increase the diameter, and then contacts with the inner wall of the riser 120 to achieve sealing, thereby completing the sealing; when the lifting force reaches the set value, the connecting pin 12 is cut off, the throttle 10 is released, and the delivery head 11 leaves the riser 120 together with the conversion short section 540 and the rope cap 530; at this time, the throttle 10 is successfully seated in the riser 120.

[0051] Pressure test: Install the pressure test cap 150, connect the first switching valve 220 and the pressure test switch valve 240, and the pressure test pump 210 pressurizes the pressure test cap 150 to perform an upper pressure test; then switch the first switching valve 220 to connect the first switching valve 220 and the second switching valve 230, and the pressure test pump 210 pressurizes the base 110 to perform a lower pressure test.

[0052] It should be noted that when the throttling nozzle 15 is blocked with a sealing sleeve, in order to reduce the switching of the on-off valve, the lower pressure test can be performed first. After the upper pressure test is completed, the pressure is further increased to cut the shear pin, thereby opening the throttling nozzle 15. If the throttling nozzle 15 is replaced with a plug, the pressure test cap 150 needs to be opened and the throttling device 10 needs to be removed, and then the plug needs to be replaced with the throttling nozzle 15 and the delivery head 11 needs to be reconnected, and the throttling device 10 needs to be lowered again for sealing before the discharge efficiency test can be performed.

[0053] Liquid discharge efficiency test: Open the throttling nozzle 15 to discharge the liquid in the riser 120; switch the second switching switch valve 230 to connect the liquid storage tank 310 with the base 110; adjust the exhaust volume of the gas source 320 to perform liquid discharge efficiency tests under different gas-liquid ratio conditions. At this time, the gas discharged from the gas source 320 can form a gas with a certain gas-liquid ratio through the liquid storage tank 310, and the gas enters the base 110 and passes through the throttle 10, the pressure test cap 150, and the liquid discharge switch valve 180 in sequence before entering the separator 400.

[0054] In this embodiment, when conducting pressure testing and drainage efficiency testing, the temperature of the grease in the annular space a can be adjusted by the heating meter 160, so as to realize testing at different temperatures and obtain the changing rules of the upper and lower pressures borne by the throttle 10 at different temperatures, as well as the changes in drainage efficiency.

[0055] By changing the exhaust volume of the gas source 320, the gas-liquid ratio entering the throttle 10 is adjusted, so the effect of the gas-liquid ratio on the discharge efficiency of the throttle 10 under the same nozzle condition can be tested. The discharge efficiency of different nozzles under the same gas-liquid ratio can also be tested by changing the nozzle structure.

[0056] The downhole choke performance testing device provided in this embodiment has the advantages of simple operation, high efficiency and low cost, and can achieve accurate control of the choke quality.

[0057] In addition, the ability of the downhole throttle to withstand upper and lower pressures and the drainage efficiency of the throttle nozzle 15 can be quickly tested under different wellbore sizes and downhole temperature conditions, and the drainage efficiency of the throttle nozzle can be tested under different gas-liquid ratios.

[0058] It can quantitatively test the indicators of upper pressure and lower pressure of downhole choke under working condition at different temperatures; it can quantitatively test the indicators of upper pressure and lower pressure of matching choke under different pipe string sizes; it can test the drainage efficiency of different types of nozzles under different gas-liquid ratios, and it can also test the drainage efficiency of different nozzles under the same gas-liquid ratio.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A downhole choke performance testing device, characterized in that: It comprises a simulation component (100), a pressure component, a liquid discharge component (300) and a separator (400); The simulation component (100) comprises a base (110), a riser (120), an outer tube (130), an outer tube cap (140), a pressure test cap (150), a heating meter (160) and a thermometer (170); The standpipe (120) is inserted into the outer pipe (130), and the throttle (10) is inserted into the standpipe (120); one end of the outer pipe (130) is sleeved on the base (110), and the other end is connected to the outer pipe cap (140); one end of the standpipe (120) is inserted into the base (110), and the other end passes through the outer pipe cap (140) and is connected to the pressure test cap (150); The annular space (a) between the vertical pipe (120) and the outer pipe (130) is filled with grease, the heating meter (160) is installed on the outer pipe (130) to heat the grease, and the thermometer (170) is installed on the outer pipe cap (140) to measure the temperature of the grease; The pressure-pressing assembly is in communication with the standpipe (120) for carrying out a pressure bearing test; the drainage assembly (300) and the separator (400) are respectively in communication with two ends of the standpipe (120) for carrying out a drainage efficiency test.

2. The downhole choke performance testing device according to claim 1, characterized in that: The pressure-pressurizing assembly comprises a pressure test pump (210) and a first switching switch valve (220), wherein the pressure test pump (210) is connected to the first switching switch valve (220), and the first switching switch valve (220) is connected to the standpipe (120); the first switching switch valve (220) switches a state so that the pressure test pump (210) pressurizes above or below the throttle (10).

3. The downhole choke performance testing device according to claim 2, characterized in that: The pressure testing assembly further comprises a second switching valve (230), one end of the second switching valve (230) being connected to the base (110), and the other end of the second switching valve (230) being connected to the first switching valve (220), for controlling the connection state between the pressure testing pump (210) and the base (110).

4. The downhole choke performance testing device according to claim 3, characterized in that: The pressure test assembly also includes a pressure test switch valve (240), one end of which is connected to the pressure test cap (150), and the other end of which is connected to the first switching switch valve (220), and is used to control the connection state between the pressure test pump (210) and the pressure test cap (150).

5. The downhole choke performance testing device according to claim 4, characterized in that: The liquid discharge assembly (300) comprises a liquid storage tank (310) and an air source (320); One end of the liquid storage tank (310) is in communication with the second switching valve (230), and the other end is in communication with the gas source (320); The second switching valve (230) switches its state so that the base (110) is in communication with the pressure test pump (210) or the liquid storage tank (310).

6. The downhole choke performance testing device according to claim 5, characterized in that: It also includes a hoisting assembly (500), wherein the hoisting assembly (500) includes a spool reel (510) and a fixed pulley (520); One end of the steel wire rope is wound around the I-shaped wheel reel (510), and the other end passes through the fixed pulley (520) for hoisting the throttle (10).

7. The downhole choke performance testing device according to claim 6, characterized in that: The hoisting assembly (500) further comprises a rope cap (530), wherein the rope cap (530) is connected to one end of the wire rope away from the spool reel (510), and comprises a body (531), an inner cylinder (532), a wedge-shaped plug (533), a connecting seat (534) and a shear nail (535); The body (531) is inserted into the connecting seat (534), the inner tube (532) is inserted into the body (531) and the connecting seat (534) and abuts against the body (531), the wedge-shaped plug (533) is inserted into the inner tube (532) and abuts against the inner tube (532), and the shear nail (535) is inserted into the body (531) and the connecting seat (534); The steel wire rope is connected to the wedge-shaped plug (533) and passes through the inner cylinder (532) and the body (531).

8. The downhole choke performance testing device according to claim 7, characterized in that: The lifting assembly (500) further includes a conversion short section (540), one end of which is provided with an internal thread, and the other end of which is provided with an external thread; one end of the conversion short section (540) is inserted into the connecting seat (534) and threadedly connected to the connecting seat (534), and the other end is connected to the throttle (10).

9. The downhole choke performance testing device according to claim 8, characterized in that: The hoisting assembly (500) further comprises a platform (550), and the spool reel (510), the fixed pulley (520) and the base (110) are all mounted on the platform (550).

10. A method for testing the performance of a downhole choke, using the downhole choke performance testing device according to claim 9, characterized in that: The steps include: Throttle release and sealing: blocking the throttling nozzle (15) of the throttle (10) and lifting the throttle (10) through the lifting assembly (500) and placing it into the riser (120), and then lifting it up so that the rubber cylinder (14) of the throttle (10) is pressed and sealed and the connecting pin (12) of the throttle (10) is cut off; Pressure test: installing the pressure test cap (150), connecting the first switching valve (220) and the pressure test switch valve (240), and applying pressure to the pressure test cap (150) by the pressure test pump (210) to perform an upper pressure test; then switching the first switching valve (220) to connect the first switching valve (220) and the second switching valve (230), and applying pressure to the base (110) by the pressure test pump (210) to perform a lower pressure test; Liquid discharge efficiency test: opening the throttling nozzle (15) of the throttling device (10) to discharge the liquid in the vertical pipe (120); switching the second switching valve (230) to connect the liquid storage tank (310) with the base (110); adjusting the exhaust volume of the gas source (320) to perform liquid discharge efficiency tests under different gas-liquid ratio conditions.

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