A coiled tubing drilling tool with an oil pressure balanced high-speed rotating wire structure

Abstract

The present invention relates to the field of directional drilling technology, and more particularly to a coiled tubing drilling tool with an oil pressure-balanced, high-speed rotating electrical wire structure. The tool comprises a main body housing; a drill collar for applying weight on bit and securing the main body housing; a cable transfer mechanism for transferring electrical signals; a balancing mechanism for balancing wellbore pressure and pressure within the drill tool; a slip ring connection mechanism for transmitting electrical signals; and a sealing mechanism for sealing the drill tool. The present invention enables signal and power transmission between rotating and non-rotating sections of the drill tool.

Description

Technical Field

[0001] The present invention relates to the technical field of directional drilling, in particular to a continuous tubing drilling tool with an oil pressure balanced high-speed rotating wire structure. Background Art

[0002] Construction such as logging while drilling and continuous tubing drilling requires real-time provision of inclination data and logging data. At the same time as logging, it is necessary to increase drilling time and save costs. At this time, a screw motor is needed to improve drilling efficiency. When adding a screw motor to the bottom hole drill bit assembly, there are several restrictions on the position of the screw motor. The logging probe needs to be as close to the bottom hole as possible, but the screw motor cannot be connected to too many downhole instruments due to structural limitations. Insufficient power creates a safety risk for bottom hole construction. At this time, it is necessary to design a through-line screw motor to solve this problem. The power and signal of the upper instrument are transmitted to the bottom instrument close to the drill bit through the through-line motor. Since the lower part of the through-line screw motor rotates relative to the through-line screw motor, the signal and power cannot be transmitted between the rotating and non-rotating sections of the drill bit. Therefore, there is an urgent need for a drill bit that can solve the problem of the signal and power not being able to be transmitted between the rotating and non-rotating sections of the drill bit.

[0003] Chinese patent publication number CN110485924A discloses a coiled tubing drilling power drill bit control device and its use method. The control device includes a control circuit pup section and a release control pup section. The control circuit pup section is provided with a circuit control unit and a circuit pup section body. The lower end of the coiled tubing is connected to the control circuit pup section, the hydraulic balance pup section, the hydraulic control pup section, and the release control pup section in sequence from top to bottom. The drilling power drill bit is connected to the lower end of the release control pup section. The balance piston can move up and down along the balance piston tube. Hydraulic valves 1 and 2 in the hydraulic control pup section are connected to the release hydraulic center pipe and the rotary directional inner shaft installed in the valve body connection pup section through the valve mounting body and the fluid flow channel in the valve body connection pup section.

[0004] It can be seen that the above invention has the following problems: it can only control the drilling trajectory of the drill bit, but cannot realize the transmission of signals and power between the rotating and non-rotating sections of the drilling tool. Summary of the Invention

[0005] To this end, the present invention provides a continuous tubing drilling tool with an oil pressure balanced high-speed rotating wire structure, which is used to overcome the problem in the prior art that the cable signal and power supply cannot be transmitted between the rotating and non-rotating sections of the drilling tool due to the rotation of the lower part of the wire-passing screw motor relative to the wire-passing screw motor.

[0006] To achieve the above-mentioned object, the present invention provides a coiled tubing drilling tool with an oil pressure balanced high-speed rotating wire structure, comprising:

[0007] Main body shell;

[0008] a drill collar, which is arranged outside the main body shell and has a drill bit at one end thereof, for applying drilling pressure to the drill bit and fixing the main body shell;

[0009] a cable transfer mechanism disposed inside the main housing for transferring electrical signals, comprising a first cable transfer module disposed at one end of the main housing, a second cable transfer module disposed at an end of the main housing remote from the first cable transfer module and connected to the drill bit, and an electrical connection channel disposed between the first cable transfer module and the second cable transfer module;

[0010] a balancing mechanism for balancing the wellbore pressure and the internal pressure of the drilling tool, comprising a balancing joint end cover, a piston spring, and a balancing piston, wherein one end of the balancing joint end cover is connected to the first cable adapter module and the other end is connected to the piston spring, and the other end of the piston spring is connected to the balancing piston;

[0011] A slip ring connection mechanism for transmitting electrical signals, comprising a slip ring main shaft and a slip ring assembly, wherein one end of the slip ring main shaft is connected to the balancing piston, and the other end of the slip ring main shaft is connected to the second cable adapter module, and the slip ring assembly is fixed to the slip ring main shaft by a winding pin and connected to the electrical connection channel;

[0012] A sealing mechanism is provided outside the second cable transfer module for sealing the drill tool, and includes a dynamic sealing adapter, a shaft end seal, a static sealing ring, a dynamic sealing ring, and a fluororubber tower-shaped sealing ring. The dynamic sealing adapter is fixedly connected to the main body housing and the slip ring main shaft, respectively. The shaft end seal is fixedly connected to the dynamic sealing adapter, the static sealing ring is fixedly connected to the shaft end seal, the dynamic sealing ring is fixedly connected to the second cable transfer module and connected to the static sealing ring. One end of the fluororubber tower-shaped sealing ring is connected to the dynamic sealing ring, and the inner side of the fluororubber tower-shaped sealing ring is connected to the second cable transfer module.

[0013] Furthermore, the first cable adapter module includes a first adapter shaft, a first internal cable channel, a first three-core pressure-bearing joint, and an adapter;

[0014] In which, the first adapter shaft is partially arranged inside the main shell and one end located inside the main shell is connected to the adapter. The first internal cable channel is set inside the first adapter shaft. The first adapter shaft and the adapter are respectively connected to the main shell through threads. The first three-core pressure-bearing joint is arranged inside the adapter and fixedly connected to the first adapter shaft to connect the cable structure provided in the first internal cable channel. The other end of the first three-core pressure-bearing joint is connected to the electrical connection channel.

[0015] Furthermore, the second cable adapter module includes a second adapter shaft, a second internal cable channel, a second three-core pressure-bearing joint and a connecting shaft;

[0016] Wherein, the connecting shaft portion is arranged inside the main body shell and one end located inside the main body shell is connected to the second adapter shaft, the second adapter shaft is connected to the slip ring connection mechanism at one end away from the connecting shaft, a second internal cable channel is provided inside the second adapter shaft, one end of the second internal cable channel is connected to the slip ring main shaft, the second three-core pressure-bearing joint is provided inside the end of the second adapter shaft away from the slip ring connection mechanism, for connecting the cable structure provided in the second internal cable channel, and the second adapter shaft is connected to the connecting shaft through a thread.

[0017] Furthermore, the balancing mechanism further includes two oil plugs and a one-way valve;

[0018] In which, the one-way valve is arranged at the connection between the balancing piston and the slip ring main shaft, one oil plug is arranged at the connection between the balancing joint end cover and the first cable adapter module, another oil plug is connected to the one-way valve, and the two oil plugs and the one-way valve are respectively connected to the main shell through threads.

[0019] Furthermore, the slip ring assembly includes a slip ring rotor and a slip ring stator;

[0020] The slip ring rotor is fixedly connected to the slip ring main shaft via a winding pin and radially rotates along with the slip ring main shaft, and the slip ring stator is fixedly connected to the main body shell.

[0021] Furthermore, two sets of angular contact bearings are provided at one end of the slip ring main shaft close to the second cable adapter module, and the slip ring main shaft and the angular contact bearings are fixedly connected to the dynamic seal adapter via a threaded ring.

[0022] Furthermore, the sealing mechanism further comprises a dynamic sealing spring, a dynamic sealing spring support, a sealing ring retainer and a tower-shaped sealing ring gasket;

[0023] In which, the dynamic sealing spring support is connected to the second adapter shaft, the dynamic sealing spring is arranged on the inner side of the shaft end sleeve and is sleeved on the dynamic sealing spring support, the sealing ring retainer is arranged on the outer side of the fluororubber tower-shaped sealing ring, and the tower-shaped sealing ring gasket is arranged between the fluororubber tower-shaped sealing ring and the dynamic sealing spring, so as to generate a pre-tightening force between the fluororubber tower-shaped sealing ring and the dynamic sealing ring and the static sealing ring.

[0024] Furthermore, it also includes a locking sleeve;

[0025] The locking sleeve is arranged inside the drill collar and presses the main body shell through the thread between the locking sleeve and the drill collar to prevent the main body shell from moving axially.

[0026] Furthermore, it also includes a positioning block;

[0027] The positioning block is connected to the main body shell by screws, and a limiting groove cooperating with the positioning block is provided inside the drill collar to prevent radial rotation between the drill collar and the main body shell.

[0028] Furthermore, it also includes:

[0029] A detection mechanism for detecting the internal pressure and sealing degree of the drilling tool;

[0030] An adjusting mechanism is connected to the detecting mechanism and is used to determine whether the working state of the drilling tool and the rotational speed of the slip ring spindle need to be adjusted according to the detection result of the detecting mechanism.

[0031] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention sets a main body shell inside the drill collar, which can fix the various complex internal mechanisms in corresponding positions, sets a cable transfer mechanism and a slip ring connection mechanism, which can realize the transmission of signals and power between the rotating and non-rotating sections of the drill tool, sets a balancing mechanism to adjust the internal pressure of the drill tool to maintain dynamic balance with the wellbore pressure, and sets a sealing mechanism to seal the drill tool to prevent drilling fluid, formation fluid and other substances from entering the drill tool, while preventing the fluid inside the drill tool from leaking into the wellbore.

[0032] Furthermore, the cable switching mechanism of the present invention is provided with a first cable switching module, which can be connected to the threaded screw motor to realize signal transmission, and a second cable switching module is provided, which can be connected to the power module to realize power transmission.

[0033] Furthermore, the balancing mechanism of the present invention is provided with an oil plug and a one-way valve, which can control the sealing performance of the sealed cavity inside the drilling tool and prevent leakage and backflow of substances in the cavity.

[0034] Furthermore, the slip ring assembly of the present invention is provided with a slip ring rotor and a slip ring stator, which can realize high-speed rotation and transmission of power and signals between the rotating part and the non-rotating part.

[0035] Furthermore, the present invention is provided with a detection mechanism and an adjustment mechanism, which can monitor the internal pressure and sealing degree of the drill tool in real time, ensure the construction quality of the drill tool, and avoid damage to the drill tool during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1A schematic structural diagram of a coiled tubing drilling tool for oil pressure balanced high-speed rotating wire structure according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of a bottom hole assembly for logging while drilling according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a bottom hole assembly for coiled tubing drilling according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the internal wire connections of a coiled tubing drilling tool for an oil pressure balanced high-speed rotating wire structure according to an embodiment of the present invention;

[0040] In the figure: 401-1, first adapter shaft; 402-1, first three-core pressure-bearing joint; 401-2, second adapter shaft; 402-2, second three-core pressure-bearing joint; 403, balance piston; 404, slip ring assembly; 404-1, slip ring stator; 404-2, slip ring rotor; 405, slip ring main shaft; 406, angular contact bearing; 407, main body housing; 408, dynamic seal adapter; 409, connecting shaft; 410, static seal ring; 411, dynamic seal ring; 412, fluororubber tower seal ring; 413, dynamic seal spring; 414, dynamic seal spring support; 415, locking sleeve; 416, drill collar; 417, mud Slurry flow channel; 418-1, first internal cable channel; 418-2, second internal cable channel; 419, positioning block; 420, hexagon socket screw; 421, anti-rotation pin; 422, oil plug; 423, one-way valve; 424, balance joint end cover; 425, piston spring; 426, sealing ring retainer; 427, tower-shaped sealing ring gasket; 428, adapter; 429, coil pin; 430, threaded ring; 431, shaft end sleeve; 501, electrical connection channel; 1, drill bit; 2, rotary guide unit; 3, over-the-line screw motor; 5, power supply and communication short section; 6, drill pipe; 7, quick connector; 8, continuous oil pipe; 9, cable. DETAILED DESCRIPTION

[0041] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0043] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] See also Figures 1-4 As shown, Figure 1 A schematic structural diagram of a coiled tubing drilling tool for oil pressure balanced high-speed rotating wire structure according to an embodiment of the present invention; Figure 2 Schematic diagram of a bottom hole assembly for logging while drilling according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a bottom hole assembly for coiled tubing drilling according to an embodiment of the present invention; Figure 4 Schematic diagram of the internal wiring connection of a coiled tubing drilling tool for an oil pressure balanced high-speed rotating wire structure according to an embodiment of the present invention; in the figure: a first adapter shaft 401-1, a first three-core pressure-bearing joint 402-1, a second adapter shaft 401-2, a second three-core pressure-bearing joint 402-2, a balancing piston 403, a slip ring assembly 404, a slip ring stator 404-1, a slip ring rotor 404-2, a slip ring main shaft 405, an angular contact bearing 406, a main body housing 407, a dynamic seal adapter 408, a connecting shaft 409, a static seal ring 410, a dynamic seal ring 411, a fluororubber tower seal ring 412, a dynamic seal spring 413, a dynamic seal spring Support 414, locking sleeve 415, drill collar 416, mud flow channel 417, first internal cable channel 418-1, second internal cable channel 418-2, positioning block 419, hexagon socket screw 420, anti-rotation pin 421, oil plug 422, one-way valve 423, balance joint end cover 424, piston spring 425, sealing ring retainer 426, tower-shaped sealing ring gasket 427, adapter 428, coil pin 429, threaded ring 430, shaft end seal 431, electrical connection channel 501, drill bit 1, rotary steering unit 2, threaded screw motor 3, power and communication short section 5, drill pipe 6, quick connector 7, coiled tubing 8, cable 9.

[0046] It can be understood that the bottom hole drilling tool combination can be divided into logging while drilling and continuous tubing drilling in specific construction usage scenarios; among them, in logging while drilling, the bottom hole drilling tool combination mainly includes: drill pipe 6, power supply and communication short section 5 (including downhole instrument power supply part, logging unit), continuous tubing drilling drill with oil pressure balanced high-speed rotating wire structure, through-line screw motor 3, rotary steering unit 2 (or near drill bit azimuth gamma), drill bit 1, the two ends of the drilling tool of this application are respectively connected to the power supply and communication short section 5 and the through-line screw motor 3, the power supply and communication short section 5 is connected to the drill pipe 6 at one end away from the drilling tool, the through-line screw motor 3 is connected to the rotary steering unit 2 (or near drill bit azimuth gamma) at one end away from the drilling tool, and the rotary steering unit 2 (or near drill bit azimuth gamma) is connected to the drill bit at one end away from the through-line screw motor 3. Head 1 is connected; in continuous tubing drilling, the bottom hole drill assembly mainly includes: continuous tubing 8 (through cable 9), quick connector 7, power and communication short section 5, continuous tubing drilling drill with oil pressure balanced high-speed rotating wire structure, through-line screw motor 3, rotary steering unit 2 (or near-bit azimuth gamma) and drill bit 1. The two ends of the drilling tool of this application are respectively connected to the power and communication short section 5 and the through-line screw motor 3, the power and communication short section 5 is connected to the quick connector 7 at the end away from the drilling tool, the quick connector 7 is connected to the continuous tubing 8 (through cable 9) at the end away from the power and communication short section 5, the through-line screw motor 3 is connected to the rotary steering unit 2 (or near-bit azimuth gamma) at the end away from the drilling tool, and the rotary steering unit 2 (or near-bit azimuth gamma) is connected to the drill bit 1 at the end away from the through-line screw motor 3.

[0047] An embodiment of the present invention provides a coiled tubing drilling tool with an oil pressure balanced high-speed rotating wire structure, comprising:

[0048] The main body shell 407 is used to fix and protect the internal mechanisms;

[0049] a drill collar 416 , which is disposed outside the main housing 407 and has a drill bit at one end thereof, for applying drilling pressure to the drill bit and fixing the main housing 407 ;

[0050] Specifically, it also includes a positioning block 419;

[0051] The positioning block 419 is connected to the main housing 407 via screws, and a limiting groove cooperating with the positioning block 419 is provided inside the drill collar 416 to prevent radial rotation between the drill collar 416 and the main housing 407 .

[0052] In practice, the positioning block 419 can be fixed to the main housing 407 by means of the hexagon socket screw 420 , which enables precise positioning and enhances structural stability.

[0053] a cable transfer mechanism disposed inside the main housing for transferring electrical signals, comprising a first cable transfer module disposed at one end of the main housing, a second cable transfer module disposed at an end of the main housing remote from the first cable transfer module for connection to the drill bit, and an electrical connection channel 501 disposed between the first cable transfer module and the second cable transfer module;

[0054] Specifically, the first cable adapter module includes a first adapter shaft 401-1, a first internal cable channel 418-1, a first three-core pressure-bearing joint 402-1, and an adapter 428;

[0055] In which, the first adapter shaft 401-1 is partially arranged inside the main shell 407 and one end located inside the main shell 407 is connected to the adapter 428. The first internal cable channel 418-1 is set inside the first adapter shaft 401-1. The first adapter shaft 401-1 and the adapter 428 are respectively connected to the main shell 407 through threads. The first three-core pressure-bearing joint 402-1 is arranged inside the adapter 428 and is fixedly connected to the first adapter shaft 401-1 for connecting the cable structure provided in the first internal cable channel 418-1. The other end of the first three-core pressure-bearing joint 402-1 is connected to the electrical connection channel 50.

[0056] In practice, wires are disposed inside the electrical connection channel 501 to transmit electrical signals.

[0057] Specifically, the second cable adapter module includes a second adapter shaft 401-2, a second internal cable channel 418-2, a second three-core pressure-bearing joint 402-2 and a connecting shaft 409;

[0058] In which, the connecting shaft 409 is partially arranged in the inner part 407 of the main shell and one end located inside the main shell 407 is connected to the second adapter shaft 401-2, and the second adapter shaft 401-2 is connected to the slip ring connection mechanism at one end away from the connecting shaft 409. The second internal cable channel 418-2 is provided inside the second adapter shaft 401-2, and one end of the second internal cable channel 418-2 is connected to the slip ring main shaft 405. The second three-core pressure-bearing joint 402-2 is provided inside the end of the second adapter shaft 401-2 away from the slip ring connection mechanism, for connecting the cable structure provided in the second internal cable channel 418-2, and the second adapter shaft 401-2 is connected to the connecting shaft 409 through a thread.

[0059] In a specific embodiment, a cable structure is set in the first internal cable channel 418-1 and the second internal cable channel 418-2, one end of the cable structure set in the first internal cable channel 418-1 is connected to the wire-passing screw motor, and the other end is connected to the wire set in the electrical connection channel 501 through a first three-core pressure-bearing joint, the other end of the wire set in the electrical connection channel 501 is connected to the external joint of the slip ring assembly, the internal cable channel of the slip ring assembly is connected to the cable structure set in the second internal cable channel 418-2, and the other end of the cable structure set in the second internal cable channel 418-2 is connected to the power supply and communication short section 5 through the second three-core pressure-bearing joint 402-2, thereby realizing the function of rotating the connecting wire.

[0060] The cable switching mechanism of the present invention is provided with a first cable switching module, which can be connected to the threaded screw motor to realize signal transmission, and a second cable switching module is provided, which can be connected to the power module to realize power transmission.

[0061] Specifically, it also includes a locking sleeve;

[0062] The locking sleeve is disposed inside the drill collar and presses the main housing 407 through the threads between the locking sleeve 415 and the drill collar 416 to prevent the main housing 407 from moving axially.

[0063] A balancing mechanism for balancing the wellbore pressure and the internal pressure of the drilling tool, comprising a balancing joint end cap 424, a piston spring 425, and a balancing piston 403. One end of the balancing joint end cap 424 is connected to the first cable adapter module, and the other end is connected to the piston spring 425. The other end of the piston spring 425 is connected to the balancing piston 403.

[0064] Specifically, the balancing mechanism further includes two oil plugs 422 and a one-way valve 423;

[0065] Among them, the one-way valve 423 is arranged at the connection between the balancing piston 403 and the slip ring main shaft 405, one oil plug 422 is arranged at the connection between the balancing joint end cover 424 and the first cable transfer module, another oil plug 422 is connected to the one-way valve 423, and the two oil plugs 422 and the one-way valve 423 are respectively connected to the main housing 407 through threads.

[0066] In practice, the interior of the drilling tool is a sealed cavity, which can be sealed by being filled with silicone oil, and the silicone oil is filled / discharged through the oil plug 422 .

[0067] The balancing mechanism of the present invention is provided with an oil plug 422 and a one-way valve 423, which can control the sealing performance of the sealed cavity inside the drilling tool and prevent leakage and backflow of substances in the cavity.

[0068] A slip ring connection mechanism for transmitting electrical signals, comprising a slip ring main shaft 405 and a slip ring assembly 404. One end of the slip ring main shaft 405 is connected to the balancing piston 403, and the other end of the slip ring main shaft 405 is connected to the second cable adapter module. The slip ring assembly 404 is fixed to the slip ring main shaft 405 via a winding pin 429 and is connected to the electrical connection channel.

[0069] In implementation, the slip ring assembly 404 is provided with an external connector for connecting to the electrical connection channel 501 .

[0070] Specifically, the slip ring assembly 404 includes a slip ring rotor 404 - 2 and a slip ring stator 404 - 1 ;

[0071] The slip ring rotor 404 - 2 is fixedly connected to the slip ring main shaft 405 via a winding pin 429 and radially rotates along with the slip ring main shaft 405 . The slip ring stator 404 - 1 is fixedly connected to the main housing 407 .

[0072] In practice, an anti-rotation pin 421 is further provided to limit the slip ring stator 404 - 1 to prevent the slip ring stator 404 - 1 from radially rotating. The anti-rotation pin 421 is fixed to the main housing 407 via threads.

[0073] The slip ring assembly 404 of the present invention is provided with a slip ring rotor 404 - 2 and a slip ring stator 404 - 1 , which can realize high-speed rotation and transmit power and signals between the rotating part and the non-rotating part.

[0074] Specifically, two sets of angular contact bearings 406 are provided at one end of the slip ring main shaft 405 close to the second cable adapter module, and the slip ring main shaft 405 and the angular contact bearings 406 are fixedly connected to the dynamic seal adapter 408 via a threaded ring 430 .

[0075] A sealing mechanism is provided outside the second cable transfer module for sealing the drilling tool, and includes a dynamic sealing adapter 408, a shaft end seal 431, a static sealing ring 410, a dynamic sealing ring 411 and a fluororubber tower-shaped sealing ring 412. The dynamic sealing adapter 408 is fixedly connected to the main housing 407 and the slip ring main shaft 405, respectively. The shaft end seal 431 is fixedly connected to the dynamic sealing adapter 408. The static sealing ring 410 is fixedly connected to the shaft end seal 431. The dynamic sealing ring 411 is fixedly connected to the second cable transfer module and connected to the static sealing ring 410. One end of the fluororubber tower-shaped sealing ring 412 is connected to the dynamic sealing ring 411, and the inner side of the fluororubber tower-shaped sealing ring 412 is connected to the second cable transfer module.

[0076] Specifically, the sealing mechanism further includes a dynamic sealing spring 413, a dynamic sealing spring support 414, a sealing ring retainer 426 and a tower-shaped sealing ring gasket 427;

[0077] In which, the dynamic sealing spring support 414 is connected to the second adapter shaft 401-2, the dynamic sealing spring 413 is arranged on the inner side of the shaft end sleeve 431 and is sleeved on the dynamic sealing spring support 414, the sealing ring retainer 426 is arranged on the outer side of the fluororubber tower-shaped sealing ring 412, and the tower-shaped sealing ring gasket 427 is arranged between the fluororubber tower-shaped sealing ring 412 and the dynamic sealing spring 413, so as to generate a pre-tightening force between the fluororubber tower-shaped sealing ring 412 and the dynamic sealing ring 411 and the static sealing ring 410.

[0078] In practice, the dynamic seal ring 411, the fluororubber tower seal ring 412, the seal ring retainer 426 and the tower seal ring gasket 427 rotate together with the slip ring rotor 404-2 and the slip ring main shaft 405.

[0079] The present invention sets a main body shell 407 inside the drill collar 416, which can fix the various complex internal mechanisms in corresponding positions, and sets a cable transfer mechanism and a slip ring connection mechanism to realize the transmission of signals and power between the rotating and non-rotating sections of the drill tool. A balancing mechanism is set to adjust the internal pressure of the drill tool to maintain dynamic balance with the wellbore pressure. A sealing mechanism is set to seal the drill tool to prevent drilling fluid, formation fluid and other substances from entering the drill tool, while preventing the fluid inside the drill tool from leaking into the wellbore.

[0080] In practice, mud channels are provided on the outside of the main housing 407 and the end of the locking sleeve 415 to discharge the mud generated during the drilling process, effectively reduce the temperature during the rotation process, and enhance the stability of the well wall.

[0081] Specifically, it also includes:

[0082] A detection mechanism for detecting the internal pressure and sealing degree of the drilling tool;

[0083] It is understandable that there is no specific limitation on the method and equipment for detecting the internal pressure and sealing degree of the drill tool. For example, a number of pressure sensors are set inside the drill tool to detect the internal pressure of the drill tool, and an ultrasonic detector is used to detect the sealing degree after a certain pressure of gas is filled into the drill tool. Those skilled in the art know that any method and equipment in the prior art that can detect the internal pressure and sealing degree of the drill tool fall within the scope of protection of the present invention and will not be described in detail here.

[0084] The adjustment mechanism is connected to the detection mechanism and is used to determine whether the working state of the drilling tool and the rotation speed of the slip ring main shaft 405 need to be adjusted according to the detection result of the detection mechanism.

[0085] In implementation, if the internal sealing degree of the drill tool does not meet the preset standard and / or the actual pressure inside the drill tool is greater than or equal to the first preset pressure, it is determined that the working state of the drill tool needs to be adjusted, the drill tool is adjusted from the normal working state to the stopped working state, and the drill tool is repaired; if the internal sealing degree of the drill tool meets the preset standard and the actual pressure inside the drill tool is less than or equal to the second preset pressure, it is determined that the speed of the slip ring main shaft 405 needs to be adjusted, and the speed adjustment amount of the slip ring main shaft 405 is determined according to the difference between the actual pressure and the second preset pressure, wherein, according to the actual pressure, the speed of the slip ring main shaft 405 is adjusted. The first difference is determined based on the difference between the pressure and the second preset pressure. A first adjustment parameter is determined based on the ratio of the first difference to the second preset pressure. The speed adjustment amount of the slip ring main shaft 405 is determined based on the product of the first adjustment parameter and the current speed of the slip ring main shaft 405. The speed of the slip ring main shaft 405 is then adjusted to the sum of the current speed and the speed adjustment amount. If the internal sealing degree of the drill tool meets the preset standard and the actual pressure inside the drill tool is greater than the second preset pressure and less than the first preset pressure, it is determined that the operating state of the drill tool and the speed of the slip ring main shaft 405 do not need to be adjusted. It is understood that the first preset pressure and the second preset pressure can be set by the actual implementation personnel based on the maximum and minimum internal pressures of the drill tool during operation that have passed qualification inspection in historical data. Preferably, the first preset pressure is set to a value range of 10 MPa to 20 MPa, and the second preset pressure is set to a value range of 3 MPa to 8 MPa.

[0086] The present invention is provided with a detection mechanism and an adjustment mechanism, which can monitor the internal pressure and sealing degree of the drill tool in real time, ensure the construction quality of the drill tool, and prevent the drill tool from being damaged during construction.

[0087] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A coiled tubing drilling tool with an oil pressure balanced high-speed rotating wire structure, characterized in that: include: Main body shell; a drill collar, which is arranged outside the main body shell and has a drill bit at one end thereof, for applying bit pressure to the drill bit and fixing the main body shell; a cable transfer mechanism disposed inside the main housing for transferring electrical signals, comprising a first cable transfer module disposed at one end of the main housing, a second cable transfer module disposed at an end of the main housing remote from the first cable transfer module and connected to the drill bit, and an electrical connection channel disposed between the first cable transfer module and the second cable transfer module; a balancing mechanism for balancing the wellbore pressure and the internal pressure of the drilling tool, comprising a balancing joint end cover, a piston spring, and a balancing piston, wherein one end of the balancing joint end cover is connected to the first cable adapter module and the other end is connected to the piston spring, and the other end of the piston spring is connected to the balancing piston; A slip ring connection mechanism for transmitting electrical signals, comprising a slip ring main shaft and a slip ring assembly, wherein one end of the slip ring main shaft is connected to the balancing piston, and the other end of the slip ring main shaft is connected to the second cable adapter module, and the slip ring assembly is fixed to the slip ring main shaft by a winding pin and connected to the electrical connection channel; a sealing mechanism, which is disposed outside the second cable transfer module and is used to seal the drill tool, and includes a dynamic sealing adapter, a shaft end seal, a static sealing ring, a dynamic sealing ring, and a fluororubber tower-shaped sealing ring; the dynamic sealing adapter is fixedly connected to the main body housing and the slip ring main shaft, respectively; the shaft end seal is fixedly connected to the dynamic sealing adapter; the static sealing ring is fixedly connected to the shaft end seal; the dynamic sealing ring is fixedly connected to the second cable transfer module and connected to the static sealing ring; one end of the fluororubber tower-shaped sealing ring is connected to the dynamic sealing ring; and the inner side of the fluororubber tower-shaped sealing ring is connected to the second cable transfer module; A detection mechanism for detecting the internal pressure and sealing degree of the drilling tool; an adjusting mechanism connected to the detecting mechanism, for determining whether the working state of the drilling tool and the rotational speed of the slip ring spindle need to be adjusted according to the detection result of the detecting mechanism; If the internal sealing degree of the drill tool does not meet the preset standard and / or the actual pressure inside the drill tool is greater than or equal to the first preset pressure, it is determined that the working state of the drill tool needs to be adjusted; If the degree of sealing inside the drill tool meets the preset standard and the actual pressure inside the drill tool is less than or equal to the second preset pressure, it is determined that the speed of the slip ring main shaft needs to be adjusted, and the speed adjustment amount of the slip ring main shaft is determined according to the difference between the actual pressure and the second preset pressure; If the internal sealing degree of the drill tool meets the preset standard and the actual pressure inside the drill tool is greater than the second preset pressure and less than the first preset pressure, it is determined that there is no need to adjust the working state of the drill tool and the speed of the slip ring spindle.

2. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 1, characterized in that: The first cable adapter module includes a first adapter shaft, a first internal cable channel, a first three-core pressure-bearing joint and an adapter; In which, the first adapter shaft is partially arranged inside the main shell and one end located inside the main shell is connected to the adapter. The first internal cable channel is set inside the first adapter shaft. The first adapter shaft and the adapter are respectively connected to the main shell through threads. The first three-core pressure-bearing joint is arranged inside the adapter and fixedly connected to the first adapter shaft to connect the cable structure provided in the first internal cable channel. The other end of the first three-core pressure-bearing joint is connected to the electrical connection channel.

3. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 2, characterized in that: The second cable adapter module includes a second adapter shaft, a second internal cable channel, a second three-core pressure-bearing joint and a connecting shaft; Wherein, the connecting shaft portion is arranged inside the main body shell and one end located inside the main body shell is connected to the second adapter shaft, the second adapter shaft is connected to the slip ring connection mechanism at one end away from the connecting shaft, a second internal cable channel is provided inside the second adapter shaft, one end of the second internal cable channel is connected to the slip ring main shaft, the second three-core pressure-bearing joint is provided inside the end of the second adapter shaft away from the slip ring connection mechanism, for connecting the cable structure provided in the second internal cable channel, and the second adapter shaft is connected to the connecting shaft through a thread.

4. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 3, characterized in that: The balancing mechanism also includes two oil plugs and a one-way valve; In which, the one-way valve is arranged at the connection between the balancing piston and the slip ring main shaft, one oil plug is arranged at the connection between the balancing joint end cover and the first cable adapter module, another oil plug is connected to the one-way valve, and the two oil plugs and the one-way valve are respectively connected to the main shell through threads.

5. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 4, characterized in that: The slip ring assembly includes a slip ring rotor and a slip ring stator; The slip ring rotor is fixedly connected to the slip ring main shaft via a winding pin and radially rotates along with the slip ring main shaft, and the slip ring stator is fixedly connected to the main body shell.

6. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 5, characterized in that: Two sets of angular contact bearings are provided at one end of the slip ring main shaft close to the second cable adapter module, and the slip ring main shaft and the angular contact bearings are fixedly connected to the dynamic seal adapter through a threaded ring.

7. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 6, characterized in that: The sealing mechanism also includes a dynamic sealing spring, a dynamic sealing spring support, a sealing ring retainer and a tower-shaped sealing ring gasket; In which, the dynamic sealing spring support is connected to the second adapter shaft, the dynamic sealing spring is arranged on the inner side of the shaft end sleeve and is sleeved on the dynamic sealing spring support, the sealing ring retainer is arranged on the outer side of the fluororubber tower-shaped sealing ring, and the tower-shaped sealing ring gasket is arranged between the fluororubber tower-shaped sealing ring and the dynamic sealing spring, so as to generate a pre-tightening force between the fluororubber tower-shaped sealing ring and the dynamic sealing ring and the static sealing ring.

8. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 7, characterized in that: Also includes a locking sleeve; The locking sleeve is arranged inside the drill collar and presses the main body shell through the thread between the locking sleeve and the drill collar to prevent the main body shell from moving axially.

9. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 8, characterized in that: Also includes positioning blocks; The positioning block is connected to the main body shell by screws, and a limiting groove cooperating with the positioning block is provided inside the drill collar to prevent radial rotation between the drill collar and the main body shell.

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