A coiled tubing electric drilling device

Abstract

The present invention discloses a continuous tubing electric drilling device, wherein a fracturing vehicle is connected to one end of the continuous tubing, the other end of the continuous tubing passes through an injection head and a blowout preventer in sequence and is connected to a motor head assembly, the motor head assembly, a submersible motor and a drilling tool assembly are sequentially connected, one end of a cable is connected to a control cabinet, the other end of the cable passes through the continuous tubing and the motor head assembly in sequence and is connected to a submersible motor, and the submersible motor is a Zhongtong submersible motor. Beneficial effects: ultra-short curvature radius drilling is achieved through continuous tubing + flexible drilling tools, and reservoirs are precisely mobilized; supporting facilities are simple, drilling cycle is short, and drilling cost is low; Zhongtong submersible motor is used to provide power, has a long service life, low failure rate, no requirements on the solid content of drilling liquid, etc., and an ultra-long single-trip footage is achieved; large-displacement circulating drilling fluid can be achieved; the Zhongtong submersible motor has a compact structure and a small outer diameter, and a small-sized drill bit can be used, which is suitable for side drilling of old wells and small-diameter branch wells.

Description

Technical Field

[0001] The invention relates to the technical field of electric flexible drilling, and in particular to a continuous oil pipe electric drilling device. Background Art

[0002] With the gradual advancement of oilfield development and the improvement of mining technology, various oilfields have entered the era of precise development, which has put forward new requirements for drilling technology. In particular, the requirements for ultra-short radius drilling and precise use of reservoirs in drilling fields such as tapping the potential of remaining oil in old oilfields, developing low-permeability thin layers with horizontal wells, developing active reservoirs with edge and bottom water, and realizing fixed-layer directional water injection to improve water drive effects are more important. The conventional drilling rigs currently used usually use rotary rods and drill bits in conjunction with each other. Due to the poor flexibility of the drill rod, short radius drilling and precise use of reservoirs cannot be achieved. In addition, the drilling aperture is large, the expansion area is large, the drilling cycle is long, and the drilling cost is high. Conventional drilling rigs + flexible drilling tools can achieve drilling with drill bit bending, but the drilling curvature radius is large. Due to the poor flexibility of the drill rod, the drill tool is easy to wear with the drill rod during drilling with bending, which reduces the service life of the drilling device. The drilling aperture is large, so only large-diameter drill bits can be used, and the operation cycle is long. In addition, conventional drilling rigs and supporting equipment are complex and have poor economic benefits. The existing continuous tubing + volumetric screw motor drilling technology can accurately mobilize reservoirs, but it is easily limited by the displacement of the volumetric screw motor. In addition, the volumetric screw motor has a pressure drop, which causes excessive circulating pressure and makes it impossible to circulate drilling fluid in large volumes. As a result, when the continuous tubing is operating in a large wellbore, the drilling fluid annulus return velocity is too low and cannot carry drill cuttings, which greatly limits the application scope of the continuous tubing. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a continuous tubing electric drilling device, which can achieve ultra-short curvature radius drilling through continuous tubing + flexible drilling tools, and accurately mobilize reservoirs; the supporting facilities are simple, the drilling cycle is short, and the drilling cost is low; the Zhongtong submersible motor is used to provide power, the service life is long, the failure rate is low, and there is no requirement for the solid content, acidity and alkalinity, oil phase and water phase of the drilling liquid, so as to achieve ultra-long single-trip footage; the Zhongtong submersible motor can realize large-volume circulation of drilling fluid, and the drilling fluid carries the drill cuttings back to the ground to avoid the deposition of drill cuttings in the well, which greatly increases the application scope of continuous tubing drilling; the Zhongtong submersible motor can drive the drill bit to achieve reverse rotation, which is conducive to unblocking when the drill is stuck; the Zhongtong submersible motor has a compact structure and a small outer diameter, and can use a small-sized drill bit, which is suitable for side drilling of small-diameter branch wells in old wells; the electric control can accurately adjust the drilling speed, can realize the reminder of drilling blockage and protection of drilling blockage, and the electric control is conducive to the later realization of full-automatic drilling, logging while drilling, and directional well drilling functions.

[0004] The objective of the present invention is achieved through the following technical measures: a coiled tubing electric drilling device, comprising a fracturing vehicle, a control cabinet, a coiled tubing, an injection head, a blowout preventer, a cable, a motor head assembly, a submersible motor and a drilling tool assembly, wherein the fracturing vehicle is connected to one end of the coiled tubing, the other end of the coiled tubing sequentially passes through the injection head and the blowout preventer and is connected to the motor head assembly, the motor head assembly, the submersible motor and the drilling tool assembly are sequentially connected, one end of the cable is connected to the control cabinet, the other end of the cable sequentially passes through the coiled tubing and the motor head assembly and is connected to the submersible motor, and the submersible motor is a mid-pass submersible motor.

[0005] Furthermore, the Zhongtong submersible motor includes a shell and a stator assembly, a rotor assembly, a rotating shaft and a thrust device built into the shell. The two ends of the shell are respectively provided with an inlet end and an outlet end. The rotating shaft is a hollow structure. The two ends of the rotating shaft are respectively connected to the inner side walls of the inlet end and the outlet end of the shell through the thrust device. The rotor assembly is sheathed outside the rotating shaft, and the stator assembly is sheathed outside the rotor assembly. The rotor assembly is used in conjunction with the stator assembly. A cable channel is provided on the shell, and the cable passes through the cable channel into the interior of the shell and is connected to the stator assembly.

[0006] Furthermore, the inlet end of the shell is connected to the motor head assembly, and the end of the rotating shaft close to the outlet end of the shell is connected to the drilling tool assembly.

[0007] Furthermore, the Zhongtong submersible motor also includes a dynamic seal and a sealing cap. The cable is sealed and connected to the cable channel through the sealing cap. The dynamic seal is used to seal the two ends of the rotating shaft with the housing to prevent drilling fluid from entering the interior of the housing.

[0008] Furthermore, the Zhongtong submersible motor also includes a drilling pressure sensor, which is connected to the cable and is used to collect the axial thrust of the rotating shaft on the thrust device.

[0009] Furthermore, the Zhongtong submersible motor also includes a temperature and pressure sensor, which is arranged on the outside of the shell and one end of which penetrates deep into the shell and is connected to the cable. The temperature and pressure sensor is used to collect the temperature and pressure at the bottom of the well.

[0010] Furthermore, the drilling tool assembly includes a flexible drilling tool and a PDC drill bit, the inlet of the flexible drilling tool is connected to a submersible oil motor, and the outlet of the flexible drilling tool is connected to the PDC drill bit.

[0011] Furthermore, the motor head assembly includes a one-way valve, a release lever and a circulation valve, the inlet of the one-way valve is connected to the outlet of the continuous oil pipe, the outlet of the one-way valve is connected to the inlet of the release lever, the outlet of the release lever is connected to the inlet of the circulation valve, and the outlet of the circulation valve is connected to the mid-pass submersible motor.

[0012] Furthermore, the control cabinet is provided with a frequency conversion controller, and the frequency conversion controller can adjust the rotation speed of the Zhongtong submersible motor.

[0013] Furthermore, the cable is a multi-core cable, and the multi-core cable includes a signal cable core and a power cable core.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the electric coiled tubing drilling device can achieve ultra-short curvature radius drilling through coiled tubing + flexible drilling tools, and accurately mobilize reservoirs; the supporting facilities are simple, and the device can be integrated into a vehicle, which is convenient for equipment relocation and installation, and the length of the coiled tubing can be selected according to the drilling depth, the drilling cycle is short, and the drilling cost is low. At the same time, the coiled tubing can operate under pressure without overflow well control risks, and negative pressure underbalanced drilling can be achieved to protect the oil and gas layers; the Zhongtong submersible motor is used to provide power, which has a long service life and a low failure rate. It has no requirements for the solid content, acidity and alkalinity, oil phase and water phase of the drilling liquid, and can achieve ultra-long single-trip drilling. Compared with positive displacement screw motors, Zhongtong submersible motors have no pressure drop and low drilling fluid circulation pressure, which can realize large-volume circulation of drilling fluid. The drilling fluid carries the cuttings back to the ground to avoid the cuttings being deposited in the well, greatly increasing the application scope of continuous tubing drilling. Zhongtong submersible motors can drive the drill bit to reverse, which is conducive to unblocking when the drill is stuck. Zhongtong submersible motors have a compact structure and a small outer diameter, and can use small-sized drill bits, which are suitable for side drilling of small-diameter branch wells in old wells. Electric control can accurately adjust the drilling speed, and can realize drilling hold reminder and drilling hold protection. In addition, electric control is conducive to the later realization of fully automatic drilling, logging while drilling, and directional well drilling functions.

[0015] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the coiled tubing electric drilling device.

[0017] Figure 2 It is a structural diagram of Zhongtong submersible motor.

[0018] Among them, 1. Fracturing truck, 2. Control cabinet, 3. Continuous oil pipe, 4. Injection head, 5. BOP, 6. Motor head assembly, 7. Zhongtong submersible motor, 8. Flexible drilling tools, 9. PDC drill bit, 10. Cable, 11. Drum, 12. Flow meter, 13. Housing, 14. Stator core, 15. Rotor core, 16. Rotating shaft, 17. First thrust bearing, 18. First dynamic seal, 19. Sealing cap, 20. Drilling pressure sensor, 21. Second thrust bearing, 22. Second dynamic seal, 23. Temperature and pressure sensor, 24. Rotor bearing, 25. O-ring. DETAILED DESCRIPTION

[0019] like Figures 1 to 2 As shown, a coiled tubing electric drilling device includes a fracturing vehicle 1, a control cabinet 2, a coiled tubing 3, an injection head 4, a blowout preventer 5, a cable 10, a motor head assembly 6, a submersible motor and a drilling tool assembly. The fracturing vehicle 1 is connected to one end of the coiled tubing 3, and the fracturing vehicle 1 provides drilling fluid for drilling. Further preferably, a flow meter 12 is also provided between the fracturing vehicle 1 and the coiled tubing 3, and the flow meter 12 is used to monitor the flow of the drilling fluid entering the coiled tubing 3. The drilling device also includes a roller 11, and the roller 11 is used to roll the coiled tubing 3. The other end of the coiled tubing 3 passes through the injection head 4 and the blowout preventer 5 in sequence and is connected to the motor head assembly 6, and the motor head assembly 6, the submersible motor and the drilling tool assembly are connected in sequence. The injection head 4 and the blowout preventer 5 can make the coiled tubing operate under pressure without overflow well control risk, realize negative pressure underbalanced drilling, and protect the oil and gas layer. One end of the cable 10 is connected to the control cabinet 2, and the other end of the cable 10 passes through the continuous tubing 3 and the motor head assembly 6 in sequence and is connected to the submersible motor, which is a mid-pass submersible motor 7. The drilling fluid passes through the continuous tubing 3, the motor head assembly 6, the mid-pass submersible motor 7 and the drilling tool assembly in sequence to reach the PDC drill bit 9. The drilling fluid assists the drill bit in breaking rocks, while cooling the drill bit and carrying the drill cuttings back to the ground. The cable 10 passes through the continuous tubing 3 and the motor head assembly 6 and is connected to the submersible terminal. The cable 10 does not contact the external drilling, which can prevent the cable 10 from being worn and causing the cable core to be exposed, thereby causing the cable core to contact the drilling fluid and causing danger. The continuous tubing 3 has good flexibility, and when used in conjunction with the flexible drilling tool 8, ultra-short curvature radius drilling can be achieved, and the reservoir can be accurately mobilized. The electric drilling device of the continuous tubing 3 has simple supporting facilities, can be integrated into a vehicle, does not need to install a drilling frame, is easy to move and install, can select the length of the continuous tubing according to the drilling depth, has a short drilling cycle, and has low drilling costs. The Zhongtong submersible motor 7 is used to provide power, has a long service life, and has a low failure rate. Compared with a positive displacement screw motor, the Zhongtong submersible motor 7 has no pressure drop, a low drilling fluid circulation pressure, and can achieve large-displacement circulation of drilling fluid. The drilling fluid carries the cuttings back to the ground to avoid the cuttings from being deposited in the well, which greatly increases the application scope of continuous tubing drilling.

[0020] The submersible motor 7 includes a housing 13 and a stator assembly, a rotor assembly, a rotating shaft 16 and a thrust device built into the housing 13. The two ends of the housing 13 are respectively provided with an inlet end and an outlet end. Specifically, the housing 13 includes an upper housing and a lower housing. The upper housing and the lower housing are detachably connected and sealed by an O-ring 25. The inlet end is located on the upper housing, and the outlet end is located on the lower housing. The inlet end and the outlet end are arranged relative to each other. The rotating shaft 16 is a hollow structure, and the drilling fluid can flow in the hollow structure of the rotating shaft 16, reducing the influence of the solid phase content, acidity and alkalinity, oil phase and water phase of the drilling fluid on the motor, and increasing the drilling single-trip footage. The two ends of the rotating shaft 16 are respectively connected to the inner side walls of the inlet end and the outlet end of the housing 13 through the thrust device. Specifically, the thrust device is used to prevent the rotating shaft 16 from relative displacement with the housing 13 when rotating. The thrust device includes a thrust bearing and a thrust plate. The thrust bearing includes a first thrust bearing 17 and a second thrust bearing 21. The thrust plate includes a first thrust plate and a second thrust plate. The first thrust bearing 17 is mounted on one end of the rotating shaft 16 close to the inlet end of the housing 13 and connected to the inner side wall of the inlet end of the housing 13. The second thrust bearing 21 is mounted on one end of the rotating shaft 16 close to the outlet end of the housing 13 and connected to the inner side wall of the outlet end of the housing 13. The first thrust plate is mounted on the rotating shaft 16 and located on a side of the first thrust bearing 17 close to the motor head assembly 6. The first thrust plate is connected to the inner side wall of the inlet end of the housing 13. The second thrust plate is mounted on the rotating shaft 16 and located on a side of the second thrust bearing 21 close to the drilling tool assembly. The second thrust plate is connected to the inner side wall of the outlet end of the housing 13. The rotor assembly is mounted on the rotating shaft 16, and the stator assembly is mounted on the rotor assembly. The rotor assembly is used in conjunction with the stator assembly. Specifically, the rotating shaft 16 is fixedly connected to the rotor assembly, and the stator assembly is fixedly connected to the housing 13. The stator assembly includes a stator core 14 and a winding. The rotor assembly includes a rotor core 15. The rotor core 15 is formed by punching high-quality silicon steel sheets into rotor punching sheets and stacking them. A rotor slot is provided in the rotor core 15, and copper bars are inserted into the rotor slots. The two ends of the rotor core 15 are riveted or welded with copper end rings and the bars, and their function is to conduct magnetism and generate electromagnetic torque. A rotor bearing 24 is provided in the middle of the rotor core 15. The rotor bearing 24 can prevent the slender rotor core 15 from rubbing against the stator core 14 during operation, play a straightening role, and reduce wear. A cable 10 channel is provided on the housing 13, and the cable 10 passes through the cable channel into the interior of the housing 13 and is connected to the stator assembly. Further preferably, the inlet end of the housing 13 is connected to the motor head assembly 6, and the end of the rotating shaft 16 close to the outlet end of the housing 13 is connected to the drilling tool assembly.After the stator assembly is energized, the rotor assembly can be rotated, thereby driving the rotating shaft 16 to rotate, thereby driving the drilling tool assembly to rotate. At the same time, the drilling fluid is transported from the motor head assembly 6 to the inlet end of the housing 13, and enters the hollow structure of the rotating shaft 16 from the inlet end of the housing 13, and then transported to the drilling tool assembly, thereby reaching the PDC drill bit 9 to achieve drilling operations. The Zhongtong submersible motor 7 can realize large-volume circulation of drilling fluid, and the drilling fluid carries the cuttings back to the ground to avoid the cuttings from being deposited in the well, greatly increasing the application scope of continuous tubing 3 drilling. In addition, the Zhongtong submersible motor 7 has a compact structure and a small outer diameter, and can use a small-sized drill bit, which is suitable for side drilling of old wells and small-diameter branch wells.

[0021] The mid-pass submersible motor 7 also includes a dynamic seal and a sealing cap 19. The cable 10 is sealed and connected to the cable channel through the sealing cap 19. The dynamic seal is used to achieve sealing between the two ends of the rotating shaft 16 and the housing 13 to prevent drilling fluid from entering the interior of the housing 13. Specifically, the dynamic seal includes a first dynamic seal 18 and a second dynamic seal 22. The first dynamic seal 18 is sleeved on one end of the rotating shaft 16 close to the inlet end of the housing 13 and connected to the inner side wall of the inlet end of the housing 13. The first dynamic seal 18 is located on the side of the first thrust plate close to the motor head assembly 6. The second dynamic seal 22 is sleeved on one end of the rotating shaft 16 close to the outlet end of the housing 13 and connected to the inner side wall of the outlet end of the housing 13. The second dynamic seal 22 is located on the side of the second thrust plate close to the drilling tool assembly. The sealing cap 19 and the dynamic seal achieve sealing inside the housing 13 to prevent drilling fluid from entering the interior of the housing 13 and causing damage to the submersible motor.

[0022] The submersible motor 7 further includes a drilling pressure sensor 20, which is connected to the cable 10 extending into the housing 13, and is used to collect the axial thrust of the rotating shaft 16 on the thrust device. Specifically, the drilling pressure sensor 20 is arranged on the first thrust plate and is located between the first thrust plate and the first thrust bearing 17. The drilling pressure of the drill bit is analyzed by collecting the thrust received by the first thrust plate through the drilling pressure sensor 20, so as to realize the monitoring of the drilling pressure.

[0023] The submersible motor 7 further includes a temperature and pressure sensor 23, which is arranged outside the shell 13 and one end of which penetrates deep into the shell 13 and is connected to the cable 10. The temperature and pressure sensor 23 is used to collect the temperature and pressure at the bottom of the well.

[0024] The drilling tool assembly includes a flexible drilling tool 8 and a PDC drill bit 9. The inlet of the flexible drilling tool 8 is connected to the submersible motor 7, and the outlet of the flexible drilling tool 8 is connected to the PDC drill bit 9. Specifically, the flexible drilling tool 8 includes a plurality of short sections, each of which can be bent to one side at a fixed angle. The bending of the short sections realizes the bending of the flexible drilling tool 8, and then realizes the bending of the PDC drill bit 9, so as to realize curved drilling. In the actual drilling process, according to the requirements of the drilling curvature radius, the flexible drilling tool 8 with different numbers of short sections can be selected, and used in conjunction with the continuous oil pipe 3 to realize ultra-short curvature radius drilling and accurately mobilize the reservoir.

[0025] The motor head assembly 6 includes a one-way valve, a release handle and a circulation valve. The inlet of the one-way valve is connected to the outlet of the continuous oil pipe, the outlet of the one-way valve is connected to the inlet of the release handle, the outlet of the release handle is connected to the inlet of the circulation valve, and the outlet of the circulation valve is connected to the mid-pass submersible motor.

[0026] The control cabinet 2 is provided with a frequency conversion controller, which can adjust the speed of the submersible motor 7 through the cable 10. The speed of the submersible motor 7 is adjusted by the frequency conversion controller, and then the speed of the drilling tool assembly is adjusted, thereby adjusting the speed of the PDC drill bit 9 to achieve drilling with different speed requirements. At the same time, the drill bit can also be reversed through the frequency conversion controller. When the drill is stuck, the drill bit is reversed to release the jam.

[0027] The cable 10 is a multi-core cable. The multi-core cable includes a signal cable core and a power cable core. The signal cable core can realize that the cable 10 is connected to the drilling pressure sensor 20 and the temperature and pressure sensor 23 in the housing 13 at the same time, and transmits the drilling pressure and temperature and pressure signals collected by the drilling pressure sensor 20 and the temperature and pressure sensor 23. The power cable core supplies power to the Zhongtong submersible motor 7, accurately adjusts the drilling speed, and realizes the reminder and protection of drilling delay.

[0028] Working principle:

[0029] When drilling for the purpose of tapping the remaining oil in old oil fields or developing low-permeability thin layers in horizontal wells, the whipstock is first placed at the position of the inclination or casing window opening for directional drilling of the old well, and then the drilling device is extended into the old well. When the flexible drilling tool 8 encounters the whipstock, the flexible drilling tool 8 is restricted by the whipstock and bends, thereby driving the PDC drill bit 9 to bend in the drilling direction. The fracturing truck 1 is turned on, and the fracturing truck 1 transports the drilling fluid to the coiled tubing 3. The coiled tubing 3 transports the drilling fluid to the motor head assembly 6. The motor head assembly 6 transports the drilling fluid to the inlet end of the housing 13 of the submersible motor 7. The drilling fluid enters the rotating shaft 16 from the inlet end and is transported to the drilling tool assembly by the rotating shaft 16 and reaches the PDC drill bit 9. At this time, the control cabinet 2 is connected to the power supply of the frequency converter, and the frequency converter controls the submersible motor 7 to rotate through the cable 10, thereby driving the drilling tool assembly to rotate, and the PDC drill bit 9 starts drilling, and the fracturing fluid returns the drill cuttings from the old well to the ground.

[0030] This drilling device can also be used for the development of new wells. When developing a new well, the drilling tool assembly can use conventional drilling tools. A large-diameter drill bit can be used to drill a borehole first, and drilling fluid can be used to return the cuttings to the ground. According to actual working conditions, when a certain depth is reached, casing can be lowered into the borehole for cementing, and then a small-diameter drill bit can be used to continue drilling. According to actual working conditions, cementing can be performed again, and this can be repeated until the set depth is reached to complete the development of the new well.

[0031] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A coiled tubing electric drilling device, characterized in that: The invention comprises a fracturing vehicle, a control cabinet, a coiled tubing, an injection head, a blowout preventer, a cable, a motor head assembly, a submersible motor and a drilling tool assembly. The fracturing vehicle is connected to one end of the coiled tubing, the other end of the coiled tubing passes through the injection head and the blowout preventer in sequence and is connected to the motor head assembly, the motor head assembly, the submersible motor and the drilling tool assembly are connected in sequence, one end of the cable is connected to the control cabinet, the other end of the cable passes through the coiled tubing and the motor head assembly in sequence and is connected to the submersible motor, and the submersible motor is a Zhongtong submersible motor; the Zhongtong submersible motor includes The invention comprises a shell and a stator assembly, a rotor assembly, a rotating shaft and a thrust device built in the shell, wherein an inlet end and an outlet end are respectively arranged at two ends of the shell, the rotating shaft is a hollow structure, and the two ends of the rotating shaft are respectively connected to the inner side walls of the inlet end and the outlet end of the shell through the thrust device, the rotor assembly is sleeved outside the rotating shaft, the stator assembly is sleeved outside the rotor assembly, the rotor assembly and the stator assembly are used together, a cable channel is arranged on the shell, the cable passes through the cable channel into the shell and is connected to the stator assembly, and the drilling tool assembly comprises a flexible drilling tool and a PDC drill bit.

2. The coiled tubing electric drilling device according to claim 1, characterized in that: The inlet end of the shell is connected to the motor head assembly, and one end of the rotating shaft close to the outlet end of the shell is connected to the drilling tool assembly.

3. The coiled tubing electric drilling device according to claim 1, characterized in that: The Zhongtong submersible motor also includes a dynamic seal and a sealing cap. The cable is sealed and connected to the cable channel through the sealing cap. The dynamic seal is used to seal the two ends of the rotating shaft and the housing to prevent drilling fluid from entering the housing.

4. The coiled tubing electric drilling device according to claim 1, characterized in that: The Zhongtong submersible motor also includes a drilling pressure sensor, which is connected to the cable and is used to collect the axial thrust of the rotating shaft on the thrust device.

5. The coiled tubing electric drilling device according to claim 1, characterized in that: The Zhongtong submersible motor also includes a temperature and pressure sensor, which is arranged on the outside of the shell and one end of which penetrates deep into the shell and is connected to the cable. The temperature and pressure sensor is used to collect the temperature and pressure at the bottom of the well.

6. The coiled tubing electric drilling device according to claim 1, characterized in that: The inlet of the flexible drilling tool is connected to a submersible oil motor, and the outlet of the flexible drilling tool is connected to a PDC drill bit.

7. The coiled tubing electric drilling device according to claim 1, characterized in that: The motor head assembly includes a one-way valve, a release handle and a circulation valve. The inlet of the one-way valve is connected to the outlet of the continuous oil pipe, the outlet of the one-way valve is connected to the inlet of the release handle, the outlet of the release handle is connected to the inlet of the circulation valve, and the outlet of the circulation valve is connected to the mid-pass submersible motor.

8. The coiled tubing electric drilling device according to claim 1, characterized in that: The control cabinet is provided with a frequency conversion controller, and the frequency conversion controller can adjust the rotation speed of the Zhongtong submersible motor.

9. The coiled tubing electric drilling device according to any one of claims 1 to 8, characterized in that: The cable is a multi-core cable, and the multi-core cable includes a signal cable core and a power cable core.

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