A downhole throttling device, control circuit and operation method for a non-metallic composite coiled tubing string

Abstract

The present application discloses a downhole throttling device for a non-metallic composite coiled tubing string, a control circuit and an operation method. Among them, a downhole throttling device for a non-metallic composite coiled tubing string includes a valve body, a throttling assembly and a power assembly; the throttling assembly includes a throttling nozzle, a first elastic member and a transmission member; a flow channel is formed in the valve body; the throttling nozzle is arranged in the valve body, and one end of the throttling nozzle slides at the flow channel, and the throttling nozzle is configured to adjust the opening size of the flow channel; the other end of the throttling nozzle is connected to one end of the transmission member; the other end of the transmission member is connected to the output end of the power assembly, and the fixed end of the power assembly is connected to the valve body; the first elastic member is sleeved on the transmission member, and one end of the first elastic member abuts against the throttling nozzle, and the other end of the first elastic member abuts against the end face of the transmission member. The present application realizes stepless adjustment of the downhole throttling device on the ground, thereby controlling the wellhead pressure and production, and also improving the oilfield exploitation efficiency and reducing the cost.

Description

Technical Field

[0001] This application relates to the technical field of downhole throttling devices, and particularly to a non-metallic composite coiled tubing downhole throttling device, a control circuit and an operation method. Background Art

[0002] The non-metallic composite coiled tubing has excellent corrosion resistance, sufficient pressure-bearing strength, anti-tensile and bending resistance, and can be continuously formed, which can greatly reduce the labor intensity of construction workers and improve the efficiency of tripping operations. Therefore, it has become a good substitute for traditional steel oil pipes. Based on its good designability and continuous forming process characteristics, the non-metallic composite coiled tubing provides favorable conditions for the composite laying of cables such as power cables, signal cables and auxiliary heating cables. The downhole electronically controlled throttle valve is arranged on the non-metallic composite coiled tubing, and its main functions are mainly reflected in regulating the downhole oil and gas flow rate and controlling the liquid and gas production volume. Generally speaking, the throttle valve is a downhole tool for regulating the wellhead pressure and flow rate. During the production process of an oil well, the wellhead pressure is an important parameter, which directly affects the production capacity of the oil well and the output of oil and gas. The installation position of the downhole electronically controlled throttle valve is at the bottom of the well. Different from the throttle device that forcibly reduces the passage diameter at the wellhead, which is likely to cause a sudden drop in pressure and thus ice blockage, the downhole electronically controlled throttle valve can slowly control the wellhead pressure by adjusting the fluid flow rate entering the pipeline and is not likely to cause ice blockage. When the wellhead pressure is too high, the downhole throttle device needs to reduce the gap between the valve core and the valve seat to lower the wellhead pressure; conversely, when the wellhead pressure is too low, the downhole electronically controlled throttle device will appropriately increase the gap between the valve core and the valve seat to increase the wellhead pressure.

[0003] At present, there is no relevant device on the market that can freely adjust the flow passage area on the wellhead ground to control the flow rate. The mainstream products on the market are traditional downhole throttle devices. The existing downhole throttle devices can only be adjusted by putting in or taking out the throttle nozzle each time, and cannot be adjusted steplessly on the ground. Secondly, special fishing equipment is required for fishing during the removal process of the traditional downhole throttle device, and the single operation cost is huge. Moreover, it is also impossible to smoothly control the wellhead pressure and production volume. Therefore, the traditional downhole throttle device is likely to cause huge losses to oilfield exploitation. Therefore, there is an urgent need for a non-metallic composite coiled tubing downhole throttling device that can be adjusted steplessly on the ground. Summary of the Invention

[0004] By providing a non-metallic composite coiled tubing downhole throttling device, a control circuit and an operation method in the embodiments of this application, the technical problems in the prior art that the downhole throttle device cannot be adjusted steplessly on the ground and cannot control the wellhead pressure and production volume during fishing are solved; it realizes stepless adjustment of the downhole throttling device on the ground to control the wellhead pressure and production volume, and also improves the efficiency of oilfield exploitation and reduces the cost.

[0005] In a first aspect, an embodiment of the present invention provides a downhole throttling device for a non-metallic composite coiled tubing string, which includes a valve body, a throttling assembly, and a power assembly; the throttling assembly includes a throttling nozzle, a first elastic member, and a transmission member; a flow channel is formed on the valve body; the throttling nozzle is disposed in the valve body, and one end of the throttling nozzle slides at the flow channel, and the throttling nozzle is configured to adjust the opening size of the flow channel; the other end of the throttling nozzle is connected to one end of the transmission member; the other end of the transmission member is connected to the output end of the power assembly, and the fixed end of the power assembly is connected to the valve body; the first elastic member is sleeved on the transmission member, and one end of the first elastic member abuts against the throttling nozzle, and the other end of the first elastic member abuts against the end face of the transmission member; the first elastic member is configured to transmit the reaction force generated by its deformation to the transmission member, and transmit it to the output end of the power assembly through the transmission member.

[0006] In combination with the first aspect, in a possible implementation manner, the throttling assembly further includes a stopper; the stopper is sleeved on the outer side of the throttling nozzle, and the stopper is fixedly connected to the throttling nozzle; the stopper and the valve body are clamped in the radial direction of the throttling nozzle; one end of the first elastic member abuts against the stopper, and the other end of the first elastic member abuts against the end face of the transmission member.

[0007] In combination with the first aspect, in a possible implementation manner, the throttling assembly further includes a mounting block; the transmission member includes a lead screw and a bushing; the bushing is sleeved on the outer side of the lead screw and is fixedly connected to the lead screw; the mounting block is sleeved on the outer side of the lead screw; one side of the mounting block abuts against the first elastic member, and the other side of the mounting block abuts against the bushing.

[0008] In combination with the first aspect, in a possible implementation manner, the throttling assembly further includes a first bearing and a second bearing; both the first bearing and the second bearing are sleeved on the outer side of the lead screw, and the first bearing and the second bearing are respectively disposed on both sides of the bushing.

[0009] In combination with the first aspect, in a possible implementation manner, the power assembly includes a power member, a housing, and a coupling; the housing is connected to the valve body; the power member and the coupling are both disposed inside the housing; the fixed end of the power member is connected to the housing, the movable end of the power member is connected to one end of the coupling, and the other end of the coupling is connected to the lead screw.

[0010] In combination with the first aspect, in a possible implementation manner, it further includes a capsule protector; the capsule protector is connected to one end of the power assembly away from the throttling nozzle.

[0011] In combination with the first aspect, in a possible implementation manner, a centralizer is further included; the centralizer is connected to one end of the capsule protector away from the power assembly.

[0012] In a second aspect, an embodiment of the present invention provides a control circuit for a downhole throttling device of a non-metallic composite coiled tubing string, which is applicable to the downhole throttling device of a non-metallic composite coiled tubing string described in the first aspect or any possible implementation manner in combination with the first aspect. The control circuit includes a numerically controlled switching power supply, a first chip, a second chip, a first relay, and a second relay; the numerically controlled switching power supply is connected to the downhole throttling device of the non-metallic composite coiled tubing string; a first end of the numerically controlled switching power supply is connected to a first end of the first chip, and a second end of the numerically controlled switching power supply is connected to a second end of the first chip; a third end of the first chip outputs the voltage of the downhole throttling device; the first end of the numerically controlled switching power supply is connected to an input end of the second chip; an output end of the second chip outputs the current of the downhole throttling device; both the first end and the second end of the numerically controlled switching power supply are connected to the first relay; the second relay is connected in parallel with the first relay.

[0013] In a third aspect, an embodiment of the present invention provides an operation method for a downhole throttling device of a non-metallic composite coiled tubing string, which uses the control circuit of the downhole throttling device of a non-metallic composite coiled tubing string described in the second aspect or any possible implementation manner in combination with the second aspect. The method includes the following steps:

[0014] S1: Place the downhole throttling device in the wellbore, and control the first relay to close through the numerically controlled switching power supply to turn on the downhole throttling device of the non-metallic composite coiled tubing string;

[0015] S2: The output end of the power member rotates, drives the transmission member to rotate through the coupling, and the transmission member drives the throttle nozzle to move back and forth in the length direction of the flow passage, thereby adjusting the flow rate of the downhole throttling device;

[0016] S3: The first elastic member is stressed during the movement of the throttle nozzle, and transmits the force to the transmission member through the mounting block, and the transmission member then transmits the force to the output end of the power member through the coupling;

[0017] S4: A sensor is provided at the output end of the power member, and the sensor can convert this signal into a current signal through the second chip and display it on the control panel at the wellhead;

[0018] S5: The staff determines the position of the throttle nozzle through the current signal on the control panel and can adjust the position of the throttle nozzle, thereby accurately adjusting the flow rate of the downhole throttling device.

[0019] Combined with the third aspect, in a possible implementation manner, in the step S1, the first elastic member adds an opening / closing torque to the opening or closing of the power member.

[0020] One or more technical solutions provided by this application have at least the following technical effects:

[0021] The embodiment of the present invention adopts a non-metallic composite coiled tubing downhole throttling device, including a valve body, a throttling assembly and a power assembly; the throttling assembly includes a throttling nozzle, a first elastic member and a transmission member; a flow channel is provided on the valve body; the throttling nozzle is arranged in the valve body, and one end of the throttling nozzle slides at the flow channel, and the throttling nozzle is configured to adjust the opening size of the flow channel; the other end of the throttling nozzle is connected to one end of the transmission member; the other end of the transmission member is connected to the output end of the power assembly, and the fixed end of the power assembly is connected to the valve body; the power assembly drives the throttling nozzle to move through the transmission member, so as to achieve the purpose of steplessly adjusting the size of the flow channel; the first elastic member is sleeved on the transmission member, and one end of the first elastic member abuts against the throttling nozzle, and the other end of the first elastic member abuts against the end face of the transmission member; the first elastic member is configured to transmit the reaction force generated by its deformation to the transmission member, and transmit it to the output end of the power assembly through the transmission member. The first elastic member deforms when the throttling nozzle moves, and transmits the reaction force to the output end of the power assembly. A sensor is arranged at the output end of the power assembly, and can transmit the electrical signal to the control end on the ground through the power cable and signal cable embedded in the non-metallic composite coiled tubing, so that the ground staff can know the position of the throttling nozzle on the control panel, thereby judging the opening size of the flow channel. The staff can also control the operation of the power assembly on the control panel, so as to realize the stepless adjustment of the downhole throttling device by the ground staff. This application solves the technical problems in the prior art that the downhole throttler cannot be steplessly adjusted on the ground, and the wellhead pressure and production cannot be controlled during fishing; it realizes the stepless adjustment of the downhole throttling device on the ground, thereby controlling the wellhead pressure and production, and also improves the oilfield exploitation efficiency and reduces the cost. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Is an axonometric view of a non-metallic composite coiled tubing downhole throttling device provided by an embodiment of this application;

[0024] Figure 2 Is an axonometric view of a non-metallic composite coiled tubing downhole throttling device provided by an embodiment of this application;

[0025] Figure 3 Is an isometric view of the throttling component provided by the embodiment of the present application;

[0026] Figure 4 Is an isometric view of the power component provided by the embodiment of the present application;

[0027] Figure 5 Is a circuit diagram of the control circuit of the downhole throttling device for non-metallic composite continuous tubing provided by the embodiment of the present application;

[0028] Figure 6 Is a P&ID diagram of the first relay and the second relay provided by the embodiment of the present application;

[0029] Figure 7 Is a schematic diagram of the first chip and the second chip provided by the embodiment of the present application;

[0030] Figure 8 Is a schematic diagram of the first relay and the second relay provided by the embodiment of the present application;

[0031] Figure 9 Is a flowchart of the operation method of the downhole throttling device for non-metallic composite continuous tubing provided by the embodiment of the present application;

[0032] Figure 10 Is a schematic diagram of the non-metallic composite continuous tubing and the downhole throttling device provided by the embodiment of the present application.

[0033] Icons: 1 - valve body; 12 - flow channel; 2 - throttling component; 21 - throttling nozzle; 22 - first elastic member; 23 - transmission member; 231 - lead screw; 232 - bushing; 24 - stop block; 25 - mounting block; 26 - first bearing; 27 - second bearing; 28 - first sealing ring; 29 - second elastic member; 3 - power component; 31 - power member; 32 - housing; 33 - coupling; 34 - second sealing ring; 4 - capsule protector; 5 - centralizer; 6 - numerical control switching power supply; 7 - first chip; 8 - second chip; 9 - first relay; 10 - second relay; 101 - control cabinet; 102 - non-metallic composite continuous tubing; 103 - joint. Detailed implementation manners

[0034] Next, the technical solutions in the prior art and the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0035] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0036] The downhole throttling device provided by the embodiments of the present application is applicable to deep well oil and gas production. Natural gas production generally adopts the self-flowing method. In the early stage of natural gas well production, the well pressure is high and it is easy to produce gas in the early stage. However, during the entire life cycle of the natural gas well, as the production time of the well continues, in the middle and late stages of production, the productivity of the well will gradually decrease and the flow rate will also decrease significantly, which is not conducive to normal gas production. Especially when the gas production flow rate is lower than the critical liquid-carrying flow rate, liquid will accumulate at the bottom of the well. Once liquid accumulation occurs at the bottom of the well, the gas production of the well will be greatly reduced, and in severe cases, it will even lead to gas well flooding and production suspension. In the prior art, in order to still increase the gas production rate in the middle and late stages, a downhole throttler is used to control the channel area, thereby increasing the gas production rate. The conventional operation is to first lower a throttler with a fixed channel area into the well, but it can only maintain gas production for a period of time. In the late stage of production, the previously lowered throttler can no longer meet the gas production requirements in the later stage. Therefore, the original throttler needs to be salvaged with special equipment first, and then a throttler with a smaller channel area is lowered again, so that the well can continue to be exploited. However, in the field of oil and gas production, the cost of lowering a throttler once is huge, and professional operation is required, which is not conducive to the efficient operation of deep well gas production. Therefore, after long-term research and thinking, the present application has opened up a new path, no longer relying on the traditional inherent idea of multiple lowering of throttlers, and realizing the setting of a non-metallic composite continuous pipe string downhole throttling device in the gas production well in advance. Only need to adjust the throttling area of the corresponding downhole throttling device according to the gas production rate requirements in the middle and late stages of the gas production well, so as to meet the exploitation requirements of the entire life cycle of the gas production well, and truly realize the stepless adjustment of the non-metallic composite continuous pipe string downhole throttling device.

[0037] The embodiments of the present invention provide a non-metallic composite continuous pipe string downhole throttling device, such asFigures 1-10 As shown in the figure, it includes a valve body 1, a throttling component 2 and a power component 3; the throttling component 2 includes a throttling nozzle 21, a first elastic member 22 and a transmission member 23; a flow channel 12 is formed on the valve body 1; the throttling nozzle 21 is arranged inside the valve body 1, and one end of the throttling nozzle 21 slides at the flow channel 12, and the throttling nozzle 21 is configured to adjust the opening size of the flow channel 12; the other end of the throttling nozzle 21 is connected to one end of the transmission member 23; the other end of the transmission member 23 is connected to the output end of the power component 3, and the fixed end of the power component 3 is connected to the valve body 1; the first elastic member 22 is sleeved on the transmission member 23, and one end of the first elastic member 22 abuts against the throttling nozzle 21, and the other end of the first elastic member 22 abuts against the end face of the transmission member 23; the first elastic member 22 is configured to transmit the reaction force generated by its deformation to the transmission member 23 and transmit it to the output end of the power component 3 through the transmission member 23.

[0038] Exemplarily, the control of the downhole throttling device is mainly operated at the wellhead control cabinet 101, and the staff can operate the movement of the throttling nozzle 21 through buttons at the wellhead, so as to realize the adjustment of the area of the flow channel 12.

[0039] Exemplarily, the downhole throttling device includes a throttle valve; the material of the valve body 1 includes stainless steel. In order to better carry out heat exchange, a heat exchange groove with a length of one meter is formed on the valve body 1 in this application, and the heat exchange efficiency of the downhole throttling device is improved by increasing the contact surface between the surface of the valve body 1 and the downhole environment.

[0040] Exemplarily, four bolt holes are formed on the end face of the downhole throttling device of this application and are connected to the power component 3 through screws; the power component 3 further includes a second sealing ring 34, and the second sealing ring 34 can protect the internal components of the power component 3.

[0041] Exemplarily, the front end of the throttling nozzle 21 is a conical top sealing surface that meets the national standard, and the throttling nozzle 21 is subjected to anti-corrosion treatment, so as to ensure the service life and the sealing performance at the same time; the first elastic member 22 includes a spring, and the spring can be used as a support for the throttling nozzle 21. When the throttling nozzle 21 moves up and down, the position of the throttling nozzle 21 can be judged by the reaction force generated by the compression of the spring, that is, by observing the compression degree of the spring, the displacement or position of the throttling nozzle 21 can be indirectly judged; the first elastic member 22 can also apply an opening and closing torque to the opening or closing of the downhole throttling device, so as to effectively prevent the situation that the motor cannot be started. The transmission member 23 converts the output torque of the power component 3 into thrust, so as to drive the reciprocating movement of the throttling nozzle 21.

[0042] Exemplarily, as Figure 10 shown, the non-metallic composite coiled tubing 102 is connected to the downhole throttling device through a joint 103.

[0043] In the embodiment of the present application, as Figures 1-4 shown, the throttling assembly 2 further includes a stop block 24; the stop block 24 is sleeved outside the throttling nozzle 21, and the stop block 24 is fixedly connected to the throttling nozzle 21; the stop block 24 is clamped with the valve body 1 in the radial direction of the throttling nozzle 21; one end of the first elastic member 22 abuts against the stop block 24, and the other end of the first elastic member 22 abuts against the end face of the transmission member 23.

[0044] Exemplarily, the throttling assembly 2 further includes a first sealing ring 28; the first sealing ring 28 is arranged between the throttling nozzle 21 and the valve body 1.

[0045] Exemplarily, a moving cavity is formed on one side of the valve body 1 close to the throttling nozzle 21. The stop block 24 cooperates with the moving cavity to ensure that the throttling nozzle 21 only makes reciprocating motion without rotational motion; a wool felt ring is arranged in the moving cavity in the present application, which can reduce the jamming of the throttling nozzle 21 during movement, so as to ensure that there is no slag inclusion in the movement process of the throttling nozzle 21.

[0046] Exemplarily, the throttling assembly 2 further includes a second elastic member 29. The second elastic member 29 is sleeved outside the throttling nozzle 21. One end of the second elastic member 29 abuts against the stop block 24, and the other end of the second elastic member 29 abuts against the valve body 1.

[0047] In the embodiment of the present application, as Figures 1-4 shown, the throttling assembly 2 further includes a mounting block 25; the transmission member 23 includes a lead screw 231 and a bushing 232; the bushing 232 is sleeved outside the lead screw 231 and is fixedly connected to the lead screw 231; the mounting block 25 is sleeved outside the lead screw 231; one side of the mounting block 25 abuts against the first elastic member 22, and the other side of the mounting block 25 abuts against the bushing 232.

[0048] In the embodiment of the present application, as Figures 1-4 shown, the throttling assembly 2 further includes a first bearing 26 and a second bearing 27; both the first bearing 26 and the second bearing 27 are sleeved outside the lead screw 231, and the first bearing 26 and the second bearing 27 are respectively arranged on both sides of the bushing 232.

[0049] Exemplarily, the first bearing 26 and the second bearing 27 are respectively arranged at both ends of the bushing 232. Through the first bearing 26 and the second bearing 27, the reaction force generated by the first elastic member 22 can be transmitted to the output end of the power assembly 3, and moreover, the first bearing 26 and the second bearing 27 can reduce the friction between the lead screw 231 and the valve body 1 during rotation, so as to ensure the normal operation of the downhole throttling device.

[0050] In the embodiment of the present application, as Figures 1-4As shown in the figure, the power assembly 3 includes a power component 31, a housing 32, and a coupling 33; the housing 32 is connected to the valve body 1; both the power component 31 and the coupling 33 are disposed inside the housing 32; the fixed end of the power component 31 is connected to the housing 32, the movable end of the power component 31 is connected to one end of the coupling 33, and the other end of the coupling 33 is connected to the lead screw 231.

[0051] Exemplarily, the power assembly 3 further includes a sealing device. The power component 31 includes a motor. The sealing device can seal the motor shaft. The motor is fixed to the sealing device by bolts in cooperation with thread sealant, and the motor shaft is inserted into one end of the coupling 33; a second sealing ring 34 is disposed between the housing 32 and the valve body 1, which can seal the coupling 33 to prevent external pollutants from entering the inside of the housing 32 and contaminating the power component 31 and other components, thereby ensuring the normal operation of the motor.

[0052] Exemplarily, the housing 32 is composed of an outer box body and an outlet end cover. The outside of the power component 31 is filled with epoxy resin for sealing. The housing 32 can not only act as a retaining wall for the resin, but also increase the adhesion of the resin, and can also increase the rigidity of the housing 32, thereby improving the mechanical properties of the housing 32; the outlet end cover is provided with an outlet hole and a resin pouring port. During the actual filling process, most of the resin is first poured in, then the outlet end cover is covered, and finally the motor wire is led out and the final resin pouring is carried out.

[0053] In the embodiment of the present application, as Figures 1-4 shown, the downhole throttling device for non-metallic composite continuous tubing string further includes a capsule protector 4; the capsule protector 4 is connected to one end of the power assembly 3 away from the throttle nozzle 21.

[0054] Exemplarily, the downhole throttling device is internally provided with an internal and external pressure interaction capsule, which can achieve pressure balance, thereby reducing the opening and closing force.

[0055] Exemplarily, the capsule protector 4 is the core component of the downhole throttling device. Among them, the material of the capsule is rubber material. After filling the cavity with insulating oil, it can effectively balance the internal and external pressures, thereby reducing the overall sealing difficulty of the downhole throttling device, and can also immerse the components in lubricating oil, thereby increasing the service life of the downhole throttling device and reducing the friction between components.

[0056] In the embodiment of the present application, as Figures 1-4 shown, the downhole throttling device for non-metallic composite continuous tubing string further includes a centralizer 5, and the centralizer 5 is connected to one end of the capsule protector 4 away from the power assembly 3.

[0057] Exemplarily, a centralizer 5 is further provided at the tail end of the downhole throttling device to ensure the verticality of the downhole throttling device when it is lowered into the well, thereby improving the success rate of lowering the downhole throttling device into the well.

[0058] Exemplarily, the centralizer 5 can center the downhole throttling device as a whole without hitting the wall, thus ensuring smooth sliding during the up and down operation. Moreover, the centralizer 5 can also serve as the data storage and transmission end of the sensor, thereby transmitting the data of the downhole throttling device back to the control cabinet 101. After the downhole throttling device is placed in place, the centralizer 5 can also ensure the stability of the downhole throttling device during operation, preventing the downhole throttling device from loosening.

[0059] An embodiment of the present invention provides a control circuit for a non-metallic composite coiled tubing downhole throttling device, as Figures 5-8 shown, applicable to a non-metallic composite coiled tubing downhole throttling device, including a numerical control switching power supply 6, a first chip 7, a second chip 8, a first relay 9, and a second relay 10; the numerical control switching power supply 6 is connected to the non-metallic composite coiled tubing downhole throttling device; the first end of the numerical control switching power supply 6 is connected to the first end of the first chip 7, and the second end of the numerical control switching power supply 6 is connected to the second end of the first chip 7; the third end of the first chip 7 outputs the voltage of the downhole throttling device; the first end of the numerical control switching power supply 6 is connected to the input end of the second chip 8; the output end of the second chip 8 outputs the current of the downhole throttling device; both the first end and the second end of the numerical control switching power supply 6 are connected to the first relay 9; the second relay 10 is connected in parallel with the first relay 9.

[0060] Exemplarily, the opening and closing of the downhole throttling device can be controlled through the first relay 9 and the second relay 10, and the signals received by the output end of the power component 31 can be converted into voltage or current signals through the first chip 7 and the second chip 8. The voltage or current signals at the output end of the power component 31 are transmitted to the control end on the ground through the power cable and signal cable arranged in the non-metallic composite coiled tubing 102, thereby realizing the judgment of the opening position of the downhole throttling device, and the rotation of the power component 31 can be controlled through the control cabinet 101, thereby realizing the adjustment of the throttle nozzle 21, that is, realizing the stepless adjustment of the downhole throttling device on the ground, thereby controlling the wellhead pressure and production, improving the efficiency of oilfield exploitation, and reducing costs.

[0061] An embodiment of the present invention provides an operation method for a non-metallic composite coiled tubing downhole throttling device, as Figure 9 shown, using the control circuit of the non-metallic composite coiled tubing downhole throttling device, including the following steps:

[0062] S1: Place the downhole throttling device downhole, control the first relay 9 to close through the numerical control switching power supply 6, and turn on the non-metallic composite coiled tubing downhole throttling device;

[0063] S2: The output end of the power component 31 rotates and drives the transmission component 23 to rotate through the coupling 33. The transmission component 23 drives the throttle nozzle 21 to move back and forth in the length direction of the flow channel 12, thereby adjusting the flow rate of the downhole throttling device.

[0064] S3: The first elastic member 22 is stressed during the movement of the throttle nozzle 21, and transmits the force to the transmission member 23 through the mounting block 25. The transmission member 23 then transmits the force to the output end of the power component 31 through the coupling 33.

[0065] S4: A sensor is provided at the output end of the power component 31. The sensor can convert this signal into a current signal through the second chip 8 and display it on the control panel at the wellhead.

[0066] S5: The staff judges the position of the throttle nozzle 21 through the current signal on the control panel and can adjust the position of the throttle nozzle 21, thereby accurately adjusting the flow rate of the downhole throttling device.

[0067] In the embodiment of the present application, in step S1, the first elastic member 22 adds an opening and closing torque to the opening or closing of the power component 31.

[0068] Exemplarily, on the ground, the staff gives a start or stop signal to the power component 31 through the control panel. After receiving the signal, the power component 31 located inside the downhole throttling device rotates forward or backward, and then transfers the torque to the transmission component 23 through the coupling 33, thereby being able to adjust the displacement of the throttle nozzle 21. In the present application, by observing the degree of increase in the current on the wellhead control panel, the opening or closing position of the throttle nozzle 21 can be judged in a timely manner. Specifically, the greater the reaction force generated by the first elastic member 22, the current on the control panel will increase linearly. The main functions of the first elastic member 22 include converting the change in the displacement of the throttle nozzle 21 into a visible linear current change. At the same time, the control cabinet 101 can also detect the current of the power component 31, thereby preventing the power component 31 from burning out due to excessive current. The present application can also detect the flow rate at the wellhead and adjust the opening and closing conditions of the downhole throttling device according to the feedback result.

[0069] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0070] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A non-metallic composite continuous tubing downhole throttling device, characterized in that: It comprises a valve body (1), a throttling assembly (2) and a power assembly (3); The throttling assembly (2) comprises a throttling nozzle (21), a first elastic member (29) and a transmission member (23); The valve body (1) is provided with a flow channel (12); A heat exchange groove with a length of one meter is provided on the valve body (1); The throttle nozzle (21) is arranged in the valve body (1), and one end of the throttle nozzle (21) slides on the flow channel (12), and the throttle nozzle (21) is configured to adjust the opening size of the flow channel (12); the front end of the throttle nozzle (21) is a cone-top sealing surface that complies with national standards; the other end of the throttle nozzle (21) is connected to one end of a transmission member (23); The other end of the transmission member (23) is connected to the output end of the power assembly (3), and the fixed end of the power assembly (3) is connected to the valve body (1); The first elastic member (29) is sleeved on the transmission member (23), and one end of the first elastic member (29) abuts against the throttle nozzle (21), and the other end of the first elastic member (29) abuts against the end surface of the transmission member (23); The first elastic member (29) is configured to transmit the reaction force generated by its deformation to the transmission member (23), and transmit it to the output end of the power assembly (3) through the transmission member (23); The transmission member (23) comprises a screw rod (231) and a shaft sleeve (232); The shaft sleeve (232) is sleeved on the outer side of the screw rod (231) and is fixedly connected to the screw rod (231); The power assembly (3) comprises a power component (31), a housing (32) and a coupling (33); The housing (32) is connected to the valve body (1); The power member (31) and the coupling (33) are both arranged inside the housing (32); The fixed end of the power member (31) is connected to the housing (32), the movable end of the power member (31) is connected to one end of the coupling (33), and the other end of the coupling (33) is connected to the screw rod (231); The first elastic member (29) adds an opening and closing torque to the opening or closing of the power member (31); The throttling assembly (2) further comprises a stopper (24); The stopper (24) is sleeved on the outside of the throttle nozzle (21), and the stopper (24) is fixedly connected to the throttle nozzle (21); The stopper (24) is clamped with the valve body (1) in the radial direction of the throttle nozzle (21); One end of the first elastic member (29) abuts against the stopper (24), and the other end of the first elastic member (29) abuts against the end surface of the transmission member (23); The throttling assembly (2) further comprises a second elastic member (22), the second elastic member (22) being sleeved on the outside of the throttling nozzle (21), one end of the second elastic member (22) being in contact with the stopper (24), and the other end of the second elastic member (22) being in contact with the valve body (1); Also included is a capsule protector (4); The capsule protector (4) is connected to an end of the power assembly (3) away from the throttle nozzle (21); Also included is a centralizer (5); The centralizer (5) is connected to an end of the capsule protector (4) away from the power assembly (3).

2. The non-metallic composite continuous tubing string downhole throttling device according to claim 1 is characterized in that: The throttling assembly (2) further comprises a mounting block (25); The mounting block (25) is sleeved on the outer side of the screw rod (231); One side of the mounting block (25) abuts against the first elastic member (29), and the other side of the mounting block (25) abuts against the shaft sleeve (232).

3. The non-metallic composite continuous tubing string downhole throttling device according to claim 2 is characterized in that: The throttling assembly (2) further comprises a first bearing (26) and a second bearing (27); The first bearing (26) and the second bearing (27) are both sleeved on the outside of the screw rod (231), and the first bearing (26) and the second bearing (27) are respectively arranged on both sides of the shaft sleeve (232).

4. A control circuit for a non-metallic composite continuous tubing downhole throttling device, characterized in that: A non-metallic composite continuous tubing downhole throttling device applicable to any one of claims 1 to 3, comprising a digital control switch power supply (6), a first chip (7), a second chip (8), a first relay (9) and a second relay (10); The digital control switch power supply (6) is connected to the non-metallic composite continuous tubing string downhole throttling device; The first end of the digitally controlled switching power supply (6) is connected to the first end of the first chip (7), and the second end of the digitally controlled switching power supply (6) is connected to the second end of the first chip (7); The third terminal of the first chip (7) outputs the voltage of the downhole throttling device; The first end of the digital control switch power supply (6) is connected to the input end of the second chip (8); the output end of the second chip (8) outputs the current of the downhole throttling device; The first end of the digital control switch power supply (6) and the second end of the digital control switch power supply (6) are both connected to the first relay (9); The second relay (10) is connected in parallel with the first relay (9).

5. A method for operating a non-metallic composite coiled tubing downhole throttling device, characterized in that: The control circuit of the non-metallic composite continuous tubing string downhole throttling device according to claim 4 comprises the following steps: S1: placing the downhole throttling device underground, controlling the first relay (9) to close through a digital control switch power supply (6), and opening the downhole throttling device of the non-metallic composite continuous tubing string; in the step S1, the first elastic member (29) adds a starting and closing torque to the opening or closing of the power member (31); S2: the output end of the power member (31) rotates and drives the transmission member (23) to rotate through the coupling (33), and the transmission member (23) drives the throttle nozzle (21) to move forward and backward in the length direction of the flow channel (12), thereby adjusting the flow rate of the downhole throttling device; S3: The first elastic member (29) is subjected to force during the movement of the throttle nozzle (21), and transmits the force to the transmission member (23) through the mounting block (25), and the transmission member (23) then transmits the force to the output end of the power member (31) through the coupling (33); S4: A sensor is provided at the output end of the power member (31), and the sensor is capable of converting the signal into a current signal through the second chip (8) and displaying it on a control panel at the wellhead; S5: The staff determines the position of the throttle nozzle (21) through the current signal on the control panel, and can adjust the position of the throttle nozzle (21), thereby accurately adjusting the flow rate of the downhole throttling device.

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