Nonmetal composite coiled tubing string downhole throttling device, control circuit and operation method

Abstract

The invention discloses a nonmetal composite coiled tubing string downhole throttling device, a control circuit and an operation method.The nonmetal composite coiled tubing string downhole throttling device comprises a valve body, a throttling assembly and a power assembly; the throttling assembly comprises a throttling nozzle, a first elastic piece and a transmission piece. A flow channel is formed in the valve body; the throttling nozzle is arranged in the valve body, one end of the throttling nozzle slides in 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 with one end of the transmission part; the other end of the transmission part is connected with the output end of the power assembly, and the fixed end of the power assembly is connected with the valve body. The first elastic piece is arranged on the transmission piece in a sleeving mode, one end of the first elastic piece abuts against the throttling nozzle, and the other end of the first elastic piece abuts against the end face of the transmission piece. The underground throttling device is subjected to stepless regulation on the ground, so that the pressure and the yield of a wellhead are controlled, the oilfield exploitation efficiency is also improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of downhole throttling devices, and in particular to a non-metallic composite continuous tubing downhole throttling device, a control circuit and an operating method. Background Art

[0002] The non-metallic composite continuous tubing string has excellent corrosion resistance, sufficient pressure bearing strength, tensile and bending resistance, and can be continuously formed, which can greatly reduce the labor intensity of construction workers and improve the efficiency of well operation. Therefore, it has become a good substitute for traditional steel oil pipes. Based on good designability and continuous forming process characteristics, the non-metallic composite continuous tubing string provides favorable conditions for the composite laying of power cables, signal cables, auxiliary heating cables and other cables. The downhole electric-controlled throttle valve is set on the non-metallic composite continuous tubing string. The function of the downhole electric-controlled throttle valve is mainly reflected in regulating the downhole oil and gas flow and controlling the liquid and gas production. In layman's terms, the throttle valve is a downhole tool for regulating wellhead pressure and flow. In the production process of oil wells, wellhead pressure is an important parameter, which directly affects the production capacity of oil wells and the output of oil and gas. The installation position of the downhole electric control throttle valve is at the bottom of the well. Unlike the throttle valve, which can force the diameter to be reduced at the wellhead, it is easy to cause a sudden pressure drop and ice blockage. The downhole electric control throttle valve can achieve slow control of the wellhead pressure by adjusting the fluid flow entering the pipeline, and it is not easy to cause ice blockage. When the wellhead pressure is too high, the downhole throttle valve is required to reduce the gap between the valve core and the valve seat, thereby reducing the wellhead pressure; conversely, when the wellhead pressure is too low, the downhole electric control throttle valve will appropriately increase the gap between the valve core and the valve seat, thereby increasing the wellhead pressure.

[0003] At present, there is no relevant equipment on the market that can freely adjust the flow area on the wellhead surface to control the flow rate. The mainstream product on the market is the traditional downhole choke, and the existing downhole choke can only be adjusted by inserting or removing the throttle nozzle each time, and cannot be adjusted steplessly on the ground. Secondly, the traditional downhole choke also needs special salvage equipment to salvage during the removal process, and the cost of a single operation is huge. It is also impossible to smoothly control the wellhead pressure and production. Therefore, the traditional downhole choke is easy to cause huge losses to oil field exploitation. Therefore, there is an urgent need for a non-metallic composite continuous tubing downhole throttling device that can be infinitely adjusted on the ground. Summary of the invention

[0004] The embodiment of the present application solves the technical problems in the prior art that the downhole throttle cannot be adjusted steplessly on the ground and the pressure and production at the wellhead cannot be controlled during salvage by providing a non-metallic composite continuous tubing downhole throttling device, a control circuit and an operating method; the downhole throttling device can be adjusted steplessly on the ground, thereby controlling the pressure and production at the wellhead, and also improving the efficiency of oil field exploitation and reducing costs.

[0005] In the first aspect, an embodiment of the present invention provides a non-metallic composite continuous tubing downhole throttling device, comprising a valve body, a throttling assembly and a power assembly; the throttling assembly comprises a throttling nozzle, a first elastic member and a transmission member; a flow channel is opened 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 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, the throttling assembly also includes a block; the block is sleeved on the outside of the throttle nozzle, and the block is fixedly connected to the throttle nozzle; the block and the valve body are clamped in the radial direction of the throttle nozzle; one end of the first elastic member abuts against the block, 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, the throttling assembly also includes a mounting block; the transmission member includes a screw rod and a sleeve; the sleeve is sleeved on the outside of the screw rod and fixedly connected to the screw rod; the mounting block is sleeved on the outside of the screw rod; one side of the mounting block abuts against the first elastic member, and the other side of the mounting block abuts against the sleeve.

[0008] In combination with the first aspect, in a possible implementation, the throttling assembly also includes a first bearing and a second bearing; the first bearing and the second bearing are both sleeved on the outer side of the screw rod, and the first bearing and the second bearing are respectively arranged on both sides of the sleeve.

[0009] In combination with the first aspect, in a possible implementation, 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 arranged 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 screw rod.

[0010] In combination with the first aspect, in a possible implementation, a capsule protector is further included; the capsule protector is connected to an end of the power assembly away from the throttle nozzle.

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

[0012] In the second aspect, an embodiment of the present invention provides a control circuit for a non-metallic composite continuous tubing downhole throttling device, which is suitable for the non-metallic composite continuous tubing downhole throttling device described in the first aspect or in combination with any possible implementation method of the first aspect, and includes a digital control switch power supply, a first chip, a second chip, a first relay and a second relay; the digital control switch power supply is connected to the non-metallic composite continuous tubing downhole throttling device; the first end of the digital control switch power supply is connected to the first end of the first chip, and the second end of the digital control switch power supply is connected to the second end of the first chip; the third end of the first chip outputs the voltage of the downhole throttling device; the first end of the digital control switch power supply is connected to the input end of the second chip; the output end of the second chip outputs the current of the downhole throttling device; the first end of the digital control switch power supply and the second end of the digital control switch power supply are both 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 operating method for a non-metallic composite continuous tubing string downhole throttling device, using the control circuit of the non-metallic composite continuous tubing string downhole throttling device described in the second aspect or in combination with any possible implementation of the second aspect, comprising the following steps: S1: Place the downhole throttling device underground, control the first relay to close through the digital control switch power supply, and open the downhole throttling device of the non-metallic composite continuous tubing string; S2: The output end of the power component rotates and drives the transmission component to rotate through the coupling. The transmission component drives the throttle nozzle to move forward and backward in the length direction of the flow channel, thereby adjusting the flow of the downhole throttling device; S3: The first elastic member is subjected to force 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; S4: A sensor is provided at the output end of the power component, and the sensor can convert the signal into a current signal through the second chip and display it on the control panel at the wellhead; 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 to accurately adjust the flow of the downhole throttling device.

[0014] In combination with the third aspect, in a possible implementation, in step S1, the first elastic member adds an opening and closing torque to the opening or closing of the power member.

[0015] One or more technical solutions provided by this application have at least the following technical effects: The embodiment of the present invention adopts a non-metallic composite continuous 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 opened 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, thereby achieving 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 is deformed when the throttle moves, and transmits the reaction force to the output end of the power assembly. The output end of the power assembly is provided with a sensor, which 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 continuous pipe string, so that the ground staff can know the position of the throttle 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, thereby realizing the stepless adjustment of the downhole throttle device on the ground by the staff. The present application solves the technical problem that the downhole throttle cannot be adjusted steplessly on the ground in the prior art, and the pressure and production at the wellhead cannot be controlled during salvage; it realizes the stepless adjustment of the downhole throttle device on the ground, thereby controlling the pressure and production at the wellhead, and also improves the efficiency of oil field exploitation and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 An axonometric diagram of a non-metallic composite continuous tubing downhole throttling device provided in an embodiment of the present application; Figure 2 An axonometric diagram of a non-metallic composite continuous tubing downhole throttling device provided in an embodiment of the present application; Figure 3 An axonometric diagram of a throttling assembly provided in an embodiment of the present application; Figure 4 An axonometric view of a power assembly provided in an embodiment of the present application; Figure 5A circuit diagram of a control circuit of a non-metallic composite continuous tubing string downhole throttling device provided in an embodiment of the present application; Figure 6 A P&ID diagram of a first relay and a second relay provided in an embodiment of the present application; Figure 7 A schematic diagram of a first chip and a second chip provided in an embodiment of the present application; Figure 8 A schematic diagram of a first relay and a second relay provided in an embodiment of the present application; Fig. 9 A flow chart of an operating method of a non-metallic composite coiled tubing downhole throttling device provided in an embodiment of the present application; Fig.10 Schematic diagram of the non-metallic composite continuous tubing string and downhole throttling device provided in an embodiment of the present application.

[0018] Icons: 1-valve body; 12-flow channel; 2-throttling assembly; 21-throttling nozzle; 22-first elastic member; 23-transmission member; 231-screw rod; 232-sleeve; 24-stopper; 25-mounting block; 26-first bearing; 27-second bearing; 28-first sealing ring; 29-second elastic member; 3-power assembly; 31-power member; 32-housing; 33-coupling; 34-second sealing ring; 4-capsule protector; 5-centralizer; 6-CNC switch power supply; 7-first chip; 8-second chip; 9-first relay; 10-second relay; 101-control cabinet; 102-non-metallic composite continuous tubing string; 103-connector. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the prior art and the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the 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 the specific circumstances.

[0021] The downhole throttling device provided in the embodiment of the present application is suitable for deep well oil and gas production. Natural gas production generally adopts the self-blowing method. In the early stage of natural gas well production, the gas well pressure is high and gas production is easy in the early stage. However, during the entire life cycle of the natural gas well, as the gas well production time continues, in the middle and late stages of production, the gas well production capacity will gradually decrease, and the flow rate will also significantly decrease, which is not conducive to normal gas production. In particular, when the gas production flow rate is lower than the critical liquid-carrying flow rate, liquid will accumulate at the bottom of the gas well. Once liquid accumulation occurs at the bottom of the well, the production of the gas well will be greatly reduced. In severe cases, it will also cause the gas well to be flooded and shut down. In order to still increase the gas production rate in the middle and late stages of the prior art, a downhole throttling device is used to control the channel area, thereby increasing the gas production rate. The conventional operation is to first lower a throttling device with a fixed channel area into the well, but it can only maintain gas production for a period of time. In the late stages of production, the gas well will be completely shut down. The throttle previously lowered can no longer meet the later gas production requirements, so the original throttle needs to be salvaged with special equipment, and then a throttle with a smaller channel area needs to be lowered again so that the well can continue to be mined. However, in the field of oil and gas production, the cost of lowering a throttle 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 development and thinking, the present application has opened up a new path, which no longer relies on the inherent idea of ​​traditional multiple lowering of throttles, and realizes the pre-installation of non-metallic composite continuous tubing downhole throttling device in the gas well. It only needs 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 well, so as to meet the mining requirements of the gas well throughout its life cycle, and truly realize the stepless adjustment of the non-metallic composite continuous tubing downhole throttling device.

[0022] The embodiment of the present invention provides a non-metallic composite continuous tubing string downhole throttling device, such as Figure 1-10 As shown, it includes a valve body 1, a throttling assembly 2 and a power assembly 3; the throttling assembly 2 includes a throttling nozzle 21, a first elastic member 22 and a transmission member 23; a flow channel 12 is opened on the valve body 1; the throttling nozzle 21 is arranged in 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 assembly 3, and the fixed end of the power assembly 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 assembly 3 through the transmission member 23.

[0023] For example, the downhole throttling device is mainly controlled in the wellhead control cabinet 101 , and the staff can operate the movement of the throttling nozzle 21 by pressing a button at the wellhead, thereby adjusting the area of ​​the flow channel 12 .

[0024] Exemplarily, the downhole throttling device includes a throttling valve; the material of the valve body 1 includes stainless steel. In order to better perform thermal interaction in the downhole throttling device, the present application provides a heat exchange groove with a length of one meter on the valve body 1, and also increases the contact area between the surface of the valve body 1 and the downhole environment, thereby improving the efficiency of heat exchange in the downhole throttling device.

[0025] Exemplarily, four bolt holes are opened on the end face of the downhole throttling device of the present application, which is connected to the power assembly 3 by screws; the power assembly 3 also includes a second sealing ring 34, which can protect the internal components of the power assembly 3.

[0026] Exemplarily, the front end of the throttle 21 is a cone-top sealing surface that meets the national standard, and the throttle 21 is treated with corrosion resistance, so that the service life and sealing performance can be guaranteed; the first elastic member 22 includes a spring, which can be used as a support for the throttle 21, and when the throttle 21 moves up and down, the reaction force generated by the compression of the spring can determine the position of the throttle 21, that is, by observing the degree of compression of the spring, the displacement or position of the throttle 21 can be indirectly determined; 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 motor from failing to open. The transmission member 23 converts the output torque of the power assembly 3 into thrust, thereby driving the reciprocating motion of the throttle 21.

[0027] For example, Fig.10 As shown, the non-metallic composite continuous tubing string 102 is connected to the downhole throttling device through a joint 103 .

[0028] In the present application embodiment, Figure 1-4 As shown, the throttling assembly 2 also includes a stopper 24; the stopper 24 is sleeved on the outside of the throttling nozzle 21, and the stopper 24 is fixedly connected to the throttling nozzle 21; the stopper 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 stopper 24, and the other end of the first elastic member 22 abuts against the end face of the transmission member 23.

[0029] Exemplarily, the throttling assembly 2 further includes a first sealing ring 28 ; the first sealing ring 28 is disposed between the throttling nozzle 21 and the valve body 1 .

[0030] Exemplarily, an action chamber is opened on one side of the valve body 1 near the throttle nozzle 21, and the block 24 cooperates with the action chamber to ensure that the throttle nozzle 21 does not rotate but only reciprocates; the present application provides a wool felt ring in the action chamber to reduce the obstruction of the throttle nozzle 21 during movement, thereby ensuring that there is no slag inclusion in the throttle nozzle 21 during movement.

[0031] Exemplarily, the throttling assembly 2 further includes a second elastic member 29 , which is sleeved on the outside of the throttling nozzle 21 , one end of the second elastic member 29 abuts against the stopper 24 , and the other end of the second elastic member 29 abuts against the valve body 1 .

[0032] In the present application embodiment, Figure 1-4 As shown, the throttling assembly 2 also includes a mounting block 25; the transmission member 23 includes a screw rod 231 and a sleeve 232; the sleeve 232 is sleeved on the outer side of the screw rod 231 and fixedly connected to the screw rod 231; 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 22, and the other side of the mounting block 25 abuts against the sleeve 232.

[0033] In the present application embodiment, Figure 1-4 As shown, the throttling assembly 2 further includes 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 sleeve 232 .

[0034] Exemplarily, a first bearing 26 and a second bearing 27 are respectively provided at both ends of the sleeve 232, and the reaction force of the first elastic member 22 can be transmitted to the output end of the power component 3 through the first bearing 26 and the second bearing 27. In addition, the first bearing 26 and the second bearing 27 can reduce the friction between the screw rod 231 and the valve body 1 during the rotation process, thereby ensuring the normal operation of the downhole throttling device.

[0035] In the present application embodiment, Figure 1-4As shown, the power assembly 3 includes a power piece 31, a housing 32 and a coupling 33; the housing 32 is connected to the valve body 1; the power piece 31 and the coupling 33 are both arranged inside the housing 32; the fixed end of the power piece 31 is connected to the housing 32, the movable end of the power piece 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.

[0036] Exemplarily, the power assembly 3 also includes a sealing device, the power part 31 includes a motor, the sealing device can seal the motor shaft, the motor is fixed to the sealing device by bolts and threaded glue, and the motor shaft is inserted into one end of the coupling 33; a second sealing ring 34 is arranged between the outer shell 32 and the valve body 1, which can seal the coupling 33 to prevent external contaminants from entering the interior of the outer shell 32 and contaminating the power part 31 and other components, thereby ensuring the normal operation of the motor.

[0037] Exemplarily, the housing 32 is composed of an outer box body and an outlet terminal cover. The outside of the power part 31 is sealed by epoxy resin filling. 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 terminal cover is provided with an outlet hole and a resin potting port. In the actual filling process, most of the resin is first poured in, then the outlet terminal cover is covered, and finally the motor line is led out for final resin potting.

[0038] In the present application embodiment, Figure 1-4 As shown, the non-metallic composite continuous tubing downhole throttling device further includes a capsule protector 4 ; the capsule protector 4 is connected to one end of the power assembly 3 away from the throttling nozzle 21 .

[0039] Exemplarily, the downhole throttling device is equipped with an internal and external pressure interactive capsule, which can achieve pressure balance and thus reduce the opening or closing force.

[0040] For example, the capsule protector 4 is a core component of the downhole throttling device. The capsule is made of rubber material, and after the cavity is filled 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 the components.

[0041] In the present application embodiment, Figure 1-4 As shown, the non-metallic composite continuous tubing downhole throttling device further includes a centralizer 5 , which is connected to one end of the capsule protector 4 away from the power assembly 3 .

[0042] Exemplarily, a centralizer 5 is also 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.

[0043] For example, the centralizer 5 can make the downhole throttling device as a whole centered without hitting the wall, thereby ensuring smooth sliding during the up and down operation, and 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, so that the downhole throttling device will not be loose.

[0044] The embodiment of the present invention provides a control circuit of a non-metallic composite continuous tubing downhole throttling device, such as Figure 5-8 As shown, it is suitable for a downhole throttling device of a non-metallic composite continuous tubing string, 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 downhole throttling device of the non-metallic composite continuous tubing string; the first end of the digital control switch power supply 6 is connected to the first end of the first chip 7, and the second end of the digital control switch 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 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.

[0045] Exemplarily, the opening and closing of the downhole throttling device can be controlled by the first relay 9 and the second relay 10, and the signal received at the output end of the power component 31 can be converted into a voltage or current signal by the first chip 7 and the second chip 8. The voltage or current signal at the output end of the power component 31 is transmitted to the control end on the ground through the power cable and the signal cable arranged in the non-metallic composite continuous tubing 102, so as to judge the opening position of the downhole throttling device, and the rotation of the power component 31 can be controlled by the control cabinet 101, so as to adjust the throttling nozzle 21, that is, to realize stepless adjustment of the downhole throttling device on the ground, so as to control the pressure and output at the wellhead, improve the efficiency of oil field exploitation, and reduce costs.

[0046] The embodiment of the present invention provides an operation method of a non-metallic composite continuous tubing downhole throttling device, such as Fig. 9 As shown, the control circuit of the downhole throttling device using the non-metallic composite continuous tubing string includes the following steps: S1: Place the downhole throttling device underground, control the first relay 9 to close through the digital control switch power supply 6, and start the downhole throttling device of the non-metallic composite continuous tubing string; S2: The output end of the power member 31 rotates, and drives the transmission member 23 to rotate through the coupling 33. 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 22 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 can convert the signal into a current signal through the second chip 8 and display it on the 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, so as to accurately adjust the flow rate of the downhole throttling device.

[0047] 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 member 31 .

[0048] Exemplarily, the staff on the ground gives the power member 31 a start or shut down signal through the control panel. After receiving the signal, the power member 31 inside the downhole throttling device rotates forward or reversely, and then converts the torque to the transmission member 23 through the coupling 33, so that the displacement of the throttling nozzle 21 can be adjusted. The present application can timely determine the open or closed position of the throttling nozzle 21 by observing the degree of increase in the current on the wellhead control panel. Specifically, the greater the reaction force generated by the first elastic member 22, the linear increase of the current on the control panel. The main function of the first elastic member 22 includes converting the change in the displacement of the throttling nozzle 21 into a visible linear current change. At the same time, the control cabinet 101 can also detect the current of the power member 31, thereby preventing the power member 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 of the downhole throttling device according to the feedback result.

[0049] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0050] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by 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 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 (22) and a transmission member (23); The valve body (1) is provided with a flow channel (12); 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 other end of the throttle 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 assembly (3), and the fixed end of the power assembly (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 throttle nozzle (21), and the other end of the first elastic member (22) abuts against the end surface 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 the reaction force to the output end of the power assembly (3) through the transmission member (23).

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 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 (22) abuts against the stopper (24), and the other end of the first elastic member (22) abuts against the end surface of the transmission member (23).

3. 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 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 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 (22), and the other side of the mounting block (25) abuts against the shaft sleeve (232).

4. The non-metallic composite continuous tubing string downhole throttling device according to claim 3 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).

5. The non-metallic composite continuous tubing string downhole throttling device according to claim 3 is characterized in that: 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).

6. The non-metallic composite continuous tubing string downhole throttling device according to claim 1 is characterized in that: 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).

7. The non-metallic composite continuous tubing string downhole throttling device according to claim 6 is characterized in that: 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).

8. A control circuit for a downhole throttling device of a non-metallic composite continuous tubing string, characterized in that: A non-metallic composite continuous tubing downhole throttling device applicable to any one of claims 1 to 7, 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).

9. A method for operating a non-metallic composite continuous tubing downhole throttling device, characterized in that: The control circuit of the non-metallic composite continuous tubing downhole throttling device according to claim 8 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; 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 (22) 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.

10. The method for operating the non-metallic composite coiled tubing downhole throttling device according to claim 9, characterized in that: In the step S1, the first elastic member (22) adds an opening and closing torque to the opening or closing of the power member (31).

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