Coiled tubing drilling tool with oil pressure balance high-speed rotating wire structure

Abstract

The invention relates to the technical field of directional drilling, in particular to a coiled tubing drilling tool of an oil pressure balance high-speed rotating wire structure. The drill collar is used for applying drilling pressure to the drill bit and fixing the main body shell; the cable switching mechanism is used for switching electric signals; the balance mechanism is used for balancing the borehole pressure and the internal pressure of the drilling tool; the slip ring connecting mechanism is used for transmitting electric signals; and the sealing mechanism is used for sealing the drilling tool. According to the invention, transmission of signals and power between the rotating drilling tool and the non-rotating drilling tool can be realized.

Description

Technical Field

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

[0002] For operations such as logging while drilling and coiled tubing drilling, it is necessary to provide real-time inclination measurement data and logging data, and at the same time, it is necessary to improve the drilling time to save costs when logging. At this time, a positive displacement motor is needed to improve the drilling efficiency. When adding a positive displacement motor to the bottom hole assembly, there are several limitations on the position of the positive displacement motor. The logging probe needs to be as close to the bottom hole as possible, and due to structural limitations, not too many downhole instruments can be connected to the lower part of the positive displacement motor, resulting in insufficient power and safety risks for bottom hole construction. At this time, it is necessary to design a wireline positive displacement motor to solve this problem. The power supply and signal of the upper instrument are transmitted to the bottom instrument close to the drill bit through the wireline motor. Since the lower part of the wireline positive displacement motor rotates relative to the wireline positive displacement motor, the signal and power cannot be transmitted between the rotating and non-rotating two drill tools. Therefore, there is an urgent need for a drill tool that can solve the problem of signal and power not being able to be transmitted between the rotating and non-rotating two drill tools.

[0003] Chinese Patent Publication No. CN110485924A discloses a control device for a coiled tubing drilling power drill bit and its usage method. The control device includes a control circuit sub-section and a releasing control sub-section. The control circuit sub-section is provided with a circuit control unit and a circuit sub-section body. The lower end of the coiled tubing is sequentially connected to the control circuit sub-section, the hydraulic balance sub-section, the hydraulic control sub-section, and the releasing control sub-section from top to bottom. The drilling power drill tool is connected to the lower end of the releasing control sub-section. The balance piston can move up and down along the balance piston tube. The hydraulic valve 1 and the hydraulic valve 2 in the hydraulic control sub-section are connected to the releasing hydraulic center tube and the rotary orientation inner shaft installed in the valve connection sub-section through the liquid flow channels in the valve installation body and the valve body connection sub-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 and cannot realize the transmission of signals and power between the rotating and non-rotating two drill tools. Summary of the Invention

[0005] Therefore, the present invention provides a drill tool for coiled tubing drilling with an oil pressure balanced high-speed rotating wire structure to overcome the problem that in the prior art, due to the relative rotation of the lower part of the wireline positive displacement motor with respect to the wireline positive displacement motor, the cable signal and power cannot be transmitted between the rotating and non-rotating two drill tools.

[0006] To achieve the above object, the present invention provides a drill tool for coiled tubing drilling with an oil pressure balanced high-speed rotating wire structure, including: A main body housing; A drill collar is disposed outside the main body housing, and a drill bit is provided at one end thereof for applying a drilling pressure to the drill bit and fixing the main body housing; A cable transfer mechanism is disposed inside the main body housing for transferring electrical signals, including a first cable transfer module provided at one end of the main body housing, a second cable transfer module provided at the end of the main body housing away from the first cable transfer module and connected to the drill bit, and an electrical connection channel provided between the first cable transfer module and the second cable transfer module; A balancing mechanism is used to balance the wellbore pressure and the pressure inside the drill string, including a balance joint end cap, a piston spring, and a balance piston. One end of the balance joint end cap is connected to the first cable transfer module, the other end is connected to the piston spring, and the other end of the piston spring is connected to the balance piston; A slip ring connection mechanism is used to transmit electrical signals, including a slip ring main shaft and a slip ring assembly. One end of the slip ring main shaft is connected to the balance piston, the other end of the slip ring main shaft is connected to the second cable transfer module, the slip ring assembly is fixed on the slip ring main shaft by a coiled pin, and is connected to the electrical connection channel; A sealing mechanism is disposed outside the second cable transfer module for sealing the drill string, including a dynamic seal adapter, a shaft end seal sleeve, a static seal ring, a dynamic seal ring, and a fluororubber tower-shaped seal ring. The dynamic seal adapter is fixedly connected to the main body housing and the slip ring main shaft respectively, the shaft end seal sleeve is fixedly connected to the dynamic seal adapter, the static seal ring is fixedly connected to the shaft end seal sleeve, the dynamic seal ring is fixedly connected to the second cable transfer module and is connected to the static seal ring, one end of the fluororubber tower-shaped seal ring is connected to the dynamic seal ring, and the inner side of the fluororubber tower-shaped seal ring is connected to the second cable transfer module.

[0007] Further, the first cable transfer module includes a first transfer shaft, a first internal cable channel, a first three-core pressure-bearing joint, and a adapter; Wherein, a part of the first transfer shaft is disposed inside the main body housing and the end located inside the main body housing is connected to the adapter. A through first internal cable channel is provided inside the first transfer shaft. The first transfer shaft and the adapter are respectively connected to the main body housing by threads. The first three-core pressure-bearing joint is disposed inside the adapter and fixedly connected to the first transfer shaft for connecting 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.

[0008] Further, the second cable transfer module includes a second transfer shaft, a second internal cable channel, a second three-core pressure-bearing joint, and a connecting shaft; Among them, the connecting shaft part is arranged inside the main body housing and is connected to the second adapter shaft at one end inside the main body housing. The end of the second adapter shaft far from the connecting shaft is connected to the slip ring connection mechanism. A through second internal cable channel is arranged 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 arranged inside the end of the second adapter shaft far from the slip ring connection mechanism for connecting the cable structure provided in the second internal cable channel. The second adapter shaft is connected to the connecting shaft by a thread.

[0009] Further, the balancing mechanism further includes two oil plugs and a one-way valve; Among them, the one-way valve is arranged at the connection between the balance piston and the slip ring main shaft. One oil plug is arranged at the connection between the balance joint end cover and the first cable adapter module. The other 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 body housing by threads.

[0010] Further, the slip ring assembly includes a slip ring rotor and a slip ring stator; Among them, the slip ring rotor is fixedly connected to the slip ring main shaft by a roll pin and rotates radially together with the slip ring main shaft. The slip ring stator is fixedly connected to the main body housing.

[0011] Further, two groups of angular contact bearings are arranged 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 by a thread ring.

[0012] Further, the sealing mechanism further includes a dynamic seal spring, a dynamic seal spring support, a seal ring retainer, and a tapered seal ring gasket; Among them, the dynamic seal spring support is connected to the second adapter shaft. The dynamic seal spring is arranged inside the shaft end seal sleeve and sleeved on the dynamic seal spring support. The seal ring retainer is arranged outside the fluororubber tapered seal ring. The tapered seal ring gasket is arranged between the fluororubber tapered seal ring and the dynamic seal spring to generate a pre-tightening force between the fluororubber tapered seal ring, the dynamic seal ring, and the static seal ring.

[0013] Further, a locking sleeve is also included; Among them, the locking sleeve is arranged inside the drill collar and presses the main body housing through the thread between the locking sleeve and the drill collar to prevent the axial movement of the main body housing.

[0014] Further, a positioning block is also included; 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.

[0015] Furthermore, it also includes: A detection mechanism, used to detect the internal pressure and sealing degree of the drilling tool; The adjusting mechanism is connected to the detecting mechanism and is used to determine whether the working state of the drilling tool and the rotation speed of the slip ring spindle need to be adjusted according to the detection result of the detecting mechanism.

[0016] Compared with the prior art, the beneficial effects of the present invention are that a main body shell is arranged inside the drill collar, so that various complex internal mechanisms can be fixed at corresponding positions, a cable switching mechanism and a slip ring connection mechanism are arranged, so that signals and power can be transmitted between rotating and non-rotating sections of the drill tool, a balancing mechanism is arranged, so that the internal pressure of the drill tool can be adjusted to maintain a dynamic balance with the wellbore pressure, and a sealing mechanism is arranged, so that the drill tool can be sealed to prevent drilling fluid, formation fluid and other substances from entering the drill tool and prevent the fluid inside the drill tool from leaking into the wellbore.

[0017] Furthermore, the cable switching mechanism of the present invention is provided with a first cable switching module, which can be connected to the through-line screw motor to achieve signal transmission, and a second cable switching module is provided, which can be connected to the power module to achieve power transmission.

[0018] 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 avoid leakage and backflow of substances in the cavity.

[0019] 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 realize the transmission of power and signals between the rotating part and the non-rotating part.

[0020] 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 the drill tool from being damaged during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a coiled tubing drilling tool for an oil pressure balanced high-speed rotating electric wire structure according to an embodiment of the present invention; Figure 2 A 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 4Schematic diagram of internal wire connection of the drill tool for coiled tubing drilling with the oil pressure balanced high-speed rotating wire structure according to the embodiment of the present invention; In the figure: 401-1, the first transfer shaft; 402-1, the first three-core pressure-bearing joint; 401-2, the second transfer shaft; 402-2, the second three-core pressure-bearing joint; 403, the balance piston; 404, the slip ring assembly; 404-1, the slip ring stator; 404-2, the slip ring rotor; 405, the slip ring main shaft; 406, the angular contact bearing; 407, the main body housing; 408, the dynamic seal adapter; 409, the connecting shaft; 410, the static seal ring; 411, the dynamic seal ring; 412, the fluororubber tower-shaped sealing ring; 413, the dynamic seal spring; 414, the dynamic seal spring support; 415, the locking sleeve; 416, the drill collar; 417, the mud flow channel; 418-1, the first internal cable channel; 418-2, the second internal cable channel; 419, the positioning block; 420, the hexagon socket head screw; 421, the anti-rotation pin; 422, the oil plug; 423, the one-way valve; 424, the balance joint end cap; 425, the piston spring; 426, the sealing ring retainer; 427, the tower-shaped sealing ring gasket; 428, the adapter; 429, the coiled pin; 430, the threaded ring; 431, the shaft end seal sleeve; 501, the electrical connection channel; 1, the drill bit; 2, the rotary steering unit; 3, the wireline motor; 5, the power and communication sub; 6, the drill pipe; 7, the quick connector; 8, the coiled tubing; 9, the cable. Detailed implementation manners

[0022] In order to make the objectives and advantages of the present invention more clearly understood, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0024] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the 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, and therefore cannot be understood as a limitation to the present invention.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Please refer to Figures 1-4 as shown in Figure 1 a schematic structural view of a drill tool for coiled tubing drilling with an oil pressure balanced high-speed rotating wire structure according to an embodiment of the present invention; Figure 2 a schematic view of a logging-while-drilling bottomhole assembly according to an embodiment of the present invention; Figure 3 a schematic view of a coiled tubing drilling bottomhole assembly according to an embodiment of the present invention; Figure 4 an internal wire connection schematic view of a drill tool for coiled tubing drilling with an oil pressure balanced high-speed rotating wire structure according to an embodiment of the present invention; In the figure: the first adapter shaft 401-1, the first three-core pressure-bearing joint 402-1, the second adapter shaft 401-2, the second three-core pressure-bearing joint 402-2, the balance piston 403, the slip ring assembly 404, the slip ring stator 404-1, the slip ring rotor 404-2, the slip ring main shaft 405, the angular contact bearing 406, the main body housing 407, the dynamic seal adapter 408, the connecting shaft 409, the static seal ring 410, the dynamic seal ring 411, the fluororubber tower-shaped seal ring 412, the dynamic seal spring 413, the dynamic seal spring support 414, the locking sleeve 415, the drill collar 416, the mud flow channel 417, the first internal cable channel 418-1, the second internal cable channel 418-2, the positioning block 419, the hexagon socket head screw 420, the anti-rotation pin 421, the oil plug 422, the one-way valve 423, the balance joint end cap 424, the piston spring 425, the seal ring retainer 426, the tower-shaped seal ring gasket 427, the adapter 428, the coiled pin 429, the threaded ring 430, the shaft end seal sleeve 431, the electrical connection channel 501, the drill bit 1, the rotary steering unit 2, the wireline screw motor 3, the power and communication sub 5, the drill pipe 6, the quick connector 7, the coiled tubing 8, the cable 9.

[0027] It can be understood that the bottom hole assembly can be divided into logging while drilling and coiled tubing drilling in specific construction scenarios. Among them, in logging while drilling, the bottom hole assembly mainly includes: drill pipe 6, power and communication sub - joint 5 (including the downhole instrument power part, logging unit), coiled tubing drilling tool with oil pressure balanced high - speed rotating wire structure, wire - passing positive displacement motor 3, rotary steering unit 2 (or near - bit azimuth gamma), and bit 1. The two ends of the drill tool of the present application are respectively connected to the power and communication sub - joint 5 and the wire - passing positive displacement motor 3. The end of the power and communication sub - joint 5 far from the drill tool is connected to the drill pipe 6. The end of the wire - passing positive displacement motor 3 far from the drill tool is connected to the rotary steering unit 2 (or near - bit azimuth gamma). The end of the rotary steering unit 2 (or near - bit azimuth gamma) far from the wire - passing positive displacement motor 3 is connected to the bit 1. In coiled tubing drilling, the bottom hole assembly mainly includes: coiled tubing 8 (with cable 9 passing through), quick - coupling 7, power and communication sub - joint 5, coiled tubing drilling tool with oil pressure balanced high - speed rotating wire structure, wire - passing positive displacement motor 3, rotary steering unit 2 (or near - bit azimuth gamma), and bit 1. The two ends of the drill tool of the present application are respectively connected to the power and communication sub - joint 5 and the wire - passing positive displacement motor 3. The end of the power and communication sub - joint 5 far from the drill tool is connected to the quick - coupling 7. The coiled tubing 8 (with cable 9 passing through) is connected to the end of the quick - coupling 7 far from the power and communication sub - joint 5. The end of the wire - passing positive displacement motor 3 far from the drill tool is connected to the rotary steering unit 2 (or near - bit azimuth gamma). The end of the rotary steering unit 2 (or near - bit azimuth gamma) far from the wire - passing positive displacement motor 3 is connected to the bit 1.

[0028] An embodiment of the present invention provides a coiled tubing drilling tool with an oil pressure balanced high - speed rotating wire structure, including: A main body housing 407, which is used to fix and protect the internal mechanisms. A drill collar 416, which is arranged outside the main body housing 407 and has a bit at one end, used to apply drilling pressure to the bit and fix the main body housing 407. Specifically, it further includes a positioning block 419. Among them, the positioning block 419 is connected to the main body housing 407 by screws, and a limiting groove for 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 body housing 407.

[0029] In implementation, the positioning block 419 can be fixed on the main body housing 407 by an internal hexagon screw 420, which can accurately position and enhance the structural stability.

[0030] A cable connection mechanism is disposed inside the main body housing for connecting electrical signals. It includes a first cable connection module disposed at one end of the main body housing, a second cable connection module disposed at the end of the main body housing away from the first cable connection module and connected to the drill bit, and an electrical connection channel 501 disposed between the first cable connection module and the second cable connection module. Specifically, the first cable connection module includes a first connection shaft 401-1, a first internal cable channel 418-1, a first three-core pressure-bearing joint 402-1, and an adapter 428. Among them, a part of the first connection shaft 401-1 is disposed inside the main body housing 407 and the end inside the main body housing 407 is connected to the adapter 428. A through first internal cable channel 418-1 is provided inside the first connection shaft 401-1. The first connection shaft 401-1 and the adapter 428 are respectively connected to the main body housing 407 by threads. The first three-core pressure-bearing joint 402-1 is disposed inside the adapter 428 and fixedly connected to the first connection 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.

[0031] In implementation, wires are provided inside the electrical connection channel 501 for transmitting electrical signals.

[0032] Specifically, the second cable connection module includes a second connection shaft 401-2, a second internal cable channel 418-2, a second three-core pressure-bearing joint 402-2, and a connection shaft 409. Among them, a part of the connection shaft 409 is disposed inside the main body housing 407 and the end inside the main body housing 407 is connected to the second connection shaft 401-2. The end of the second connection shaft 401-2 away from the connection shaft 409 is connected to the slip ring connection mechanism. A through second internal cable channel 418-2 is provided inside the second connection shaft 401-2. 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 disposed inside the second connection shaft 401-2 at the end away from the slip ring connection mechanism for connecting the cable structure provided in the second internal cable channel 418-2. The second connection shaft 401-2 is connected to the connection shaft 409 by threads.

[0033] In a specific embodiment, a cable structure is disposed in the first internal cable channel 418-1 and the second internal cable channel 418-2. One end of the cable structure disposed 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 disposed in the electrical connection channel 501 through a first three-core pressure-bearing joint. The other end of the wire disposed 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 disposed in the second internal cable channel 418-2. The other end of the cable structure disposed in the second internal cable channel 418-2 is connected to the power supply and communication sub-section 5 through a second three-core pressure-bearing joint 402-2, realizing the function of rotating and connecting wires.

[0034] The cable transfer mechanism of the present invention is provided with a first cable transfer module, which can be connected to the wire passing screw motor to realize the transmission of signals, and a second cable transfer module, which can be connected to the power supply module to realize the transmission of power.

[0035] Specifically, it further includes a locking sleeve; Wherein, the locking sleeve is disposed inside the drill collar, and the main body housing 407 is pressed through the thread between the locking sleeve 415 and the drill collar 416 to prevent the axial movement of the main body housing 407.

[0036] A balance mechanism, which is used to balance the wellbore pressure and the pressure inside the drill string, includes a balance joint end cap 424, a piston spring 425 and a balance piston 403. One end of the balance joint end cap 424 is connected to the first cable transfer module, and the other end is connected to the piston spring 425. The other end of the piston spring 425 is connected to the balance piston 403; Specifically, the balance mechanism further includes two oil plugs 422 and a check valve 423; Wherein, the check valve 423 is disposed at the connection between the balance piston 403 and the slip ring main shaft 405. One oil plug 422 is disposed at the connection between the balance joint end cap 424 and the first cable transfer module. The other oil plug 422 is connected to the check valve 423, and the two oil plugs 422 and the check valve 423 are respectively connected to the main body housing 407 through threads.

[0037] In implementation, the inside of the drill string is a sealed cavity, which can be sealed by filling with silicone oil, and silicone oil can be filled / discharged at the oil plug 422.

[0038] The balance mechanism of the present invention is provided with oil plugs 422 and a check valve 423, which can control the sealing performance of the sealed cavity inside the drill string, and avoid the leakage and backflow of substances inside the cavity.

[0039] A slip ring connection mechanism, which is used to transmit electrical signals, comprises a slip ring main shaft 405 and a slip ring assembly 404, wherein one end of the slip ring main shaft 405 is connected to the balance piston 403, and the other end of the slip ring main shaft 405 is connected to the second cable adapter module, and the slip ring assembly 404 is fixed to the slip ring main shaft 405 by a winding pin 429 and connected to the electrical connection channel; In implementation, the slip ring assembly 404 is provided with an external connector for connecting to the electrical connection channel 501 .

[0040] Specifically, the slip ring assembly 404 includes a slip ring rotor 404 - 2 and a slip ring stator 404 - 1 ; The slip ring rotor 404 - 2 is fixedly connected to the slip ring main shaft 405 via a winding pin 429 and radially rotates together with the slip ring main shaft 405 . The slip ring stator 404 - 1 is fixedly connected to the main housing 407 .

[0041] 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 by means of threads.

[0042] 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 transmission of power and signals between the rotating part and the non-rotating part.

[0043] 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 .

[0044] A sealing mechanism is arranged outside the second cable transfer module and is used to seal the drilling tool, comprising 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.

[0045] Specifically, the sealing mechanism further includes a dynamic sealing spring 413, a dynamic sealing spring support 414, a sealing ring retainer 426, and a tapered sealing ring gasket 427; Among them, the dynamic sealing spring support 414 is connected to the second transfer shaft 401-2. The dynamic sealing spring 413 is arranged inside the shaft end seal sleeve 431 and sleeved on the dynamic sealing spring support 414. The sealing ring retainer 426 is arranged outside the fluororubber tapered sealing ring 412. The tapered sealing ring gasket 427 is arranged between the fluororubber tapered sealing ring 412 and the dynamic sealing spring 413 to generate a pre-tightening force between the fluororubber tapered sealing ring 412, the dynamic sealing ring 411, and the static sealing ring 410.

[0046] In implementation, the dynamic sealing ring 411, the fluororubber tapered sealing ring 412, the sealing ring retainer 426, and the tapered sealing ring gasket 427 rotate together with the slip ring rotor 404-2 and the slip ring main shaft 405. In the present invention, a main body housing 407 is arranged inside the drill collar 416, which can fix various complex mechanisms inside to corresponding positions. A cable transfer mechanism and a slip ring connection mechanism are arranged, which can realize the transmission of signals and power between the rotating and non-rotating sections of the drill tool. A balance mechanism is arranged to adjust the internal pressure of the drill tool to keep it in dynamic balance with the wellbore pressure. A sealing mechanism is arranged to seal the drill tool to prevent substances such as drilling fluid and formation fluid from entering the inside of the drill tool, and at the same time avoid the leakage of the fluid inside the drill tool into the wellbore.

[0047] In implementation, mud flow channels are provided outside the main body housing 407 and at the end of the locking sleeve 415 to discharge the mud generated during drilling, effectively reduce the temperature during rotation, and enhance the stability of the wellbore wall.

[0048] Specifically, it further includes: A detection mechanism for detecting the internal pressure and sealing degree of the drill tool; It can be understood that the methods and devices for detecting the internal pressure and sealing degree of the drill tool are not specifically limited. For example, several pressure sensors are arranged inside the drill tool to detect the internal pressure of the drill tool, and after filling a certain pressure of gas into the drill tool, an ultrasonic detector is used to detect the sealing degree. Those skilled in the art know that any methods and devices in the prior art that can detect the internal pressure and sealing degree of the drill tool fall within the protection scope of the present invention and will not be elaborated here.

[0049] An adjustment mechanism, which is connected to the detection mechanism, is used to determine whether it is necessary to adjust the working state of the drill tool and the rotation speed of the slip ring main shaft 405 according to the detection results of the detection mechanism.

[0050] 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 overhauled; 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 rotation speed of the slip ring main shaft 405 needs to be adjusted, and the rotation 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. Among them, a first difference is determined according to the difference between the actual pressure and the second preset pressure, a first adjustment parameter is determined according to the ratio of the first difference to the second preset pressure, and the rotation speed adjustment amount of the slip ring main shaft 405 is determined according to the product of the first adjustment parameter and the current rotation speed of the slip ring main shaft 405. Then, the rotation speed of the slip ring main shaft 405 needs to be adjusted to the sum of the current rotation speed and the rotation 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 working state of the drill tool and the rotation speed of the slip ring main shaft 405 do not need to be adjusted. It can be understood that actual implementers can set the first preset pressure and the second preset pressure respectively according to the actual situation or based on the internal maximum pressure and minimum pressure when the drill tools passing the qualification test in historical data. Preferably, the value range of the first preset pressure is set to 10 MPa to 20 MPa, and the value range of the second preset pressure is set to 3 MPa to 8 MPa.

[0051] The present invention sets up 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.

[0052] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A coiled tubing drilling tool with a hydraulically 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 drilling pressure to the drill bit and fixing the main body shell; a cable transfer mechanism, which is arranged inside the main housing and is used to transfer electrical signals, comprising a first cable transfer module arranged at one end of the main housing and a second cable transfer module arranged at an end of the main housing away from the first cable transfer module to be connected to the drill bit, and an electrical connection channel arranged between the first cable transfer module and the second cable transfer module; A balancing mechanism, which is used to balance the wellbore pressure and the internal pressure of the drilling tool, comprises 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, which is used to transmit electrical signals, comprises a slip ring main shaft and a slip ring assembly, wherein one end of the slip ring main shaft is connected to the balance 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 rolling pin and connected to the electrical connection channel; A sealing mechanism is arranged outside the second cable transfer module and is used to seal the drilling tool, comprising 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 shell 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.

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; Among them, 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 arranged 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, and 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 part 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, the second internal cable channel is arranged 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 arranged inside the end of the second adapter shaft away from the slip ring connection mechanism, and is used to connect 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 is characterized in that: The balancing mechanism also includes two oil plugs and a one-way valve; Among them, 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 conversion 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 comprises a slip ring rotor and a slip ring stator; The slip ring rotor is fixedly connected to the slip ring main shaft through a winding pin and radially rotates together 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 arranged 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.

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; Wherein, 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 guard 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; Wherein, the locking sleeve is arranged inside the drill collar, and the main body shell is pressed by the thread between the locking sleeve and the drill collar to prevent the main body shell from axial movement.

9. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 8, characterized in that: Also includes a positioning block; 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.

10. The coiled tubing drilling tool with a hydraulically balanced high-speed rotating wire structure according to claim 9, characterized in that: Also includes: A detection mechanism, used to detect the internal pressure and sealing degree of the drilling tool; The adjusting mechanism is connected to the detecting mechanism and is used to determine whether the working state of the drilling tool and the rotation speed of the slip ring spindle need to be adjusted according to the detection result of the detecting mechanism.

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