A double-channel downhole tool

Abstract

The present invention provides a double-channel downhole tool, which relates to the technical field of positive displacement motors and includes: a limiting shaft is arranged inside the housing; a first water channel is arranged inside the limiting shaft, and a second water channel is formed between the limiting shaft and the housing; the power assembly includes a stator and a rotor; an extended water channel corresponding to the first water channel is arranged inside the rotor; the driving mechanism includes a motor and a limiting sleeve; the limiting sleeve is slidably connected with the housing, and spline rotary limiting insertion teeth are arranged on the inner ring; docking teeth are arranged on the limiting shaft corresponding to the spline rotary limiting insertion teeth; a lead screw is installed on the motor; the limiting sleeve is connected with the lead screw through a nut; one end of the nut away from the motor is connected with the limiting sleeve through a connecting piece. By arranging the first water channel inside the limiting shaft and matching with the extended water channel inside the rotor, the plugging agent can be directly conveyed to the other end of the power assembly without passing through the stator cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of positive displacement downhole motors, and particularly to a two-channel downhole tool. Background Art

[0002] A positive displacement downhole motor is a positive displacement downhole power drill that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. When the mud pumped out by the mud pump flows through the bypass valve and enters the motor, a certain pressure difference is formed at the inlet and outlet of the motor, pushing the rotor to rotate around the axis of the stator, and transmitting the rotational speed and torque to the drill bit through the universal joint shaft and the drive shaft assembly, thereby realizing the drilling operation. The positive displacement downhole motor is a mature downhole power drill for oil drilling or geological exploration drilling worldwide, and is an essential tool for directional drilling and compound drilling.

[0003] Oil drilling is the most important link in the process of oil exploitation. The location of the oil well drilling and the technology adopted for drilling can both have a huge impact on the crude oil exploitation. Improper drilling location or inappropriate drilling technology may lead to leakage problems during the oil well exploitation process. In the case where the oil well still has exploitation value, once the oil well leaks, it is necessary to prevent and stop the leakage in a timely manner. Preventing and stopping the leakage of the oil well can not only solve the problem of oil well leakage, but also carry out preventive treatment, which can effectively reduce the risk of oil well leakage and improve the safety of oil well exploitation;

[0004] Since there is a sealing cavity inside the positive displacement downhole motor and the plugging agent contains large particles, it cannot reach the bottom plugging position through the positive displacement downhole motor. If high pressure is used to force the plugging, it will cause irreversible damage to the internal structure of the positive displacement downhole motor, and the drill cannot be used continuously and the drill string needs to be lifted to replace the positive displacement downhole motor;

[0005] In the existing plugging process, when the plugging operation requirements are generated, it is necessary to first lift the drill string to the ground, remove the positive displacement downhole motor, then directly connect the drill pipe to the drill bit, and then lower it to the designated position to fill the plugging agent. However, this process requires relevant equipment to be configured on the drilling platform. At the same time, due to the frequent tripping in and out of the well, not only the working efficiency is slow, but also the operation cost is increased; therefore, the above problems need to be solved urgently. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a two-channel downhole tool.

[0007] The present invention provides a two-channel downhole tool, including:

[0008] A housing, the housing extends along a first direction, and a coaxial limiting shaft is arranged inside;

[0009] A first water channel coaxial with the limiting shaft is arranged inside the limiting shaft, the outer diameter is relatively smaller than the inner diameter of the housing, and a second water channel is formed between the outer wall of the limiting shaft and the inner wall of the housing;

[0010] A powertrain, the powertrain includes a stator fixedly mounted on the housing and a rotor connected to the limit shaft;

[0011] The rotor is rotatably connected to the stator, and a matching extended water channel is provided inside corresponding to the first water channel;

[0012] A drive mechanism, the drive mechanism includes a motor fixedly mounted inside the housing and a limit sleeve sleeved on the limit shaft;

[0013] The limit sleeve is slidably connected to the housing, and evenly arranged spline rotation limit insertion teeth are provided along the circumferential direction on the inner ring, and a first limit plane for restricting rotation is provided on the outer ring;

[0014] Corresponding to the spline rotation limit insertion teeth on the limit shaft, there are matching docking teeth for restricting the rotation of the rotor;

[0015] A lead screw is installed at the output end of the motor;

[0016] The limit sleeve is connected to the lead screw through a matching nut;

[0017] The nut is sleeved on the lead screw, and a second limit plane for restricting rotation is provided on the outer ring, and one end away from the motor is connected to the limit sleeve through a connecting piece.

[0018] Furthermore,

[0019] One end of the limit shaft away from the rotor is also provided with a one-way valve for controlling the on-off of the first water channel;

[0020] The one-way valve is located inside the connecting piece and includes a fixed part connected to the limit shaft and a movable part connected to the connecting piece;

[0021] The movable part is sleeved on the fixed part, one end close to the limit shaft is an open structure, and an input port with a relatively smaller diameter is provided at one end away from the limit shaft;

[0022] The fixed part is a variable diameter structure, and the diameter of one end away from the limit shaft is relatively larger and is matched with the inner diameter of the input port for controlling the on-off of the input port.

[0023] Furthermore,

[0024] The lead screw and the motor are connected through a coupling;

[0025] An installation seat is sleeved on the coupling and is connected to the installation seat through a bearing;

[0026] The diameter of the mounting seat is relatively smaller than the inner diameter of the housing, and a relatively larger outer edge is provided in the middle for positioning and installing with the housing;

[0027] Uniformly arranged through holes are provided along the circumference on the outer edge for the drilling fluid to pass through.

[0028] Furthermore,

[0029] A first sealing sleeve is also installed on the mounting seat;

[0030] The first sealing sleeve is sleeved on the connecting piece, located on the side of the mounting seat away from the motor, and forms a main water channel with the housing;

[0031] A sealing ring is also provided between the connecting piece and the first sealing sleeve for forming a seal with the first sealing sleeve;

[0032] A matching installation groove is provided on the inner wall at the end of the first sealing sleeve away from the mounting seat corresponding to the sealing ring.

[0033] Furthermore,

[0034] A communication hole is provided on the connecting piece corresponding to the one-way valve;

[0035] The communication hole is located on the side of the sealing ring away from the motor for communicating the main water channel with the first water channel and the second water channel;

[0036] The number of the communication holes includes a plurality, and they are uniformly arranged along the axial direction on the connecting piece.

[0037] Furthermore,

[0038] A centralizer is also provided in the housing;

[0039] The centralizer is located at the end of the motor away from the limit shaft and is connected to the mounting seat through a second sealing sleeve;

[0040] A battery is also provided inside the second sealing sleeve for supplying power to the motor.

[0041] Furthermore,

[0042] A vibration sensor and a processor are also provided inside the second sealing sleeve;

[0043] The vibration sensor is connected to the processor and is configured to detect the vibration of the drill string and transmit the vibration signal to the processor;

[0044] The processor is also connected to the motor and is configured to convert a specific vibration law into start-stop signals and forward-reverse signals of the motor and transmit them to the motor.

[0045] Furthermore,

[0046] An output port is also provided at one end of the rotor away from the motor;

[0047] The output port extends along the radial direction of the rotor and is communicated with the extended water channel.

[0048] Furthermore,

[0049] A universal shaft assembly is also provided inside the housing;

[0050] The universal shaft assembly is located at one end of the rotor away from the motor and is fixedly connected to the rotor.

[0051] Furthermore,

[0052] The universal shaft assembly is also connected to the transmission shaft assembly;

[0053] The transmission shaft assembly is located at one end of the universal shaft assembly away from the rotor, and a coaxial flow channel hole is provided inside;

[0054] One end of the flow channel hole close to the universal shaft assembly extends along the radial direction of the transmission shaft assembly and penetrates through the transmission shaft assembly.

[0055] The advantages and positive effects of the present invention are:

[0056] In this technical solution, by arranging the first water channel inside the limiting shaft and cooperating with the extended water channel inside the rotor, the plugging agent can be directly conveyed to the other end of the power assembly without passing through the stator cavity; meanwhile, the limiting shaft can also be restricted from rotating by the limiting sleeve driven by the motor, and cooperating with the one-way valve linked with the connecting piece, the rotating state of the rotor can be randomly switched by the motor during the drilling process of the drill pipe, so as to switch the communication between the main water channel and the first water channel and the second water channel, and further complete plugging and resume drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic structural diagram of the universal shaft assembly of the double-channel downhole tool provided by the embodiment of the present invention;

[0058] Figure 2 It is a schematic structural diagram of the limiting shaft of the double-channel downhole tool provided by the embodiment of the present invention;

[0059] Figure 3 It is a schematic structural diagram of the one-way valve of the double-channel downhole tool provided by the embodiment of the present invention;

[0060] Figure 4 It is a schematic structural diagram of the driving mechanism of the double-channel downhole tool provided by the embodiment of the present invention;

[0061] Figure 5 A schematic structural diagram of a centralizer for a dual-flow channel downhole tool provided in an embodiment of the present invention.

[0062] The text markings in the figure are as follows: 100-housing; 110-limiting shaft; 120-check valve; 200-stator; 210-rotor; 300-motor; 310-limiting sleeve; 320-screw rod; 321-nut; 330-coupling; 340-mounting seat; 350-battery; 400-centralizer; 500-universal shaft assembly; 600-drive shaft assembly. DETAILED DESCRIPTION

[0063] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0064] Please refer to Figures 1 - 5 , by Figures 1 - 5 The double-channel downhole tool can be formed by connecting the two ends in sequence. The present embodiment provides a double-channel downhole tool, including a shell 100, the shell 100 extends in a first direction, and a coaxial limiting shaft 110 is provided inside; a coaxial first water channel is provided inside the limiting shaft 110, and the outer diameter is relatively smaller than the inner diameter of the shell 100, and a second water channel is formed between the limiting shaft 110 and the inner wall of the shell 100; a power assembly, the power assembly includes a stator 200 fixedly mounted on the shell 100 and a rotor 210 connected to the limiting shaft 110; the rotor 210 is rotatably connected to the stator 200, and a matching extension water channel is provided inside corresponding to the first water channel; a driving mechanism, the driving mechanism includes a stator 200 fixedly mounted on the shell 100 and a rotor 210 connected to the limiting shaft 110; the rotor 210 is rotatably connected to the stator 200, and a matching extension water channel is provided inside corresponding to the first water channel; and a driving mechanism includes a stator 200 fixedly mounted on the shell 100 and a rotor 210 connected to the limiting shaft 110. The motor 300 inside and the limiting sleeve 310 sleeved on the limiting shaft 110; the limiting sleeve 310 is slidably connected to the housing 100, the inner ring is provided with evenly arranged spline rotation limiting teeth along the circumferential direction, and the outer ring is provided with a first limiting plane for limiting rotation; the limiting shaft 110 is provided with matching docking teeth corresponding to the spline rotation limiting teeth, which are used to limit the rotation of the rotor 210; a screw rod 320 is installed at the output end of the motor 300; the limiting sleeve 310 is connected to the screw rod 320 through a matching nut 321; the nut 321 is sleeved on the screw rod 320, a second limiting plane for limiting rotation is provided on the outer ring, and the end away from the motor 300 is connected to the limiting sleeve 310 through a connecting piece.

[0065] In this embodiment, the housing 100 extends in the first direction and is internally provided with a power assembly and a limiting shaft 110 connected to the power assembly; the power assembly includes a stator 200 fixedly installed on the housing 100 and a rotor 210 coaxial with the housing 100; the rotor 210 is coaxially and fixedly connected to the limiting shaft 110. When the drilling fluid passes between the rotor 210 and the stator 200, the rotor 210 will rotate and drive the limiting shaft 110 to rotate synchronously; conversely, when the rotation of the limiting shaft 110 is restricted, the rotor 210 cannot rotate relative to the stator 200, and the drilling fluid cannot pass between the stator 200 and the rotor 210.

[0066] In this embodiment, a coaxial first water channel is provided inside the limiting shaft 110, and a second water channel is formed between the outside of the limiting shaft 110 and the housing 100; at the same time, a matching extended water channel is provided inside the rotor 210 corresponding to the first water channel; during normal operation, the drilling fluid first enters the second water channel and then passes between the rotor 210 and the stator 200, thereby driving the relative rotation of the rotor 210; when the rotation of the rotor 210 is restricted, the plugging agent can directly pass through the rotor 210 through the first water channel and the extended water channel for discharge and plugging; since it does not pass through the cavity between the rotor 210 and the stator 200, it will not damage them.

[0067] In this embodiment, a limiting sleeve 310 is also sleeved on the limiting shaft 110; evenly arranged spline rotary limiting insertion teeth are provided on the inner circumference of the limiting sleeve 310 along the circumferential direction, and a plurality of first limiting planes are provided on the outer circumference along the circumferential direction; corresponding to the spline rotary limiting insertion teeth on the limiting shaft 110, mating docking teeth are provided; after the limiting sleeve 310 slides to make the spline rotary limiting insertion teeth inserted into the docking teeth, since the outer circumference of the limiting sleeve 310 is docked with the inner wall of the housing 100 through the first limiting plane, it cannot rotate, and thus the rotation of the rotor 210 is restricted.

[0068] In this embodiment, the sliding of the limiting sleeve 310 is driven by a motor 300; the motor 300 is fixedly installed in the housing 100, and a lead screw 320 is installed at the output end; a nut 321 is threadedly installed on the lead screw 320 and is connected to the limiting sleeve 310 through the nut 321; a plurality of second limiting surfaces are provided on the outer circumference of the nut 321 along the circumferential direction, so that it can only slide relative to the housing 100 and cannot rotate; the limiting sleeve 310 is connected to the nut 321 through a connecting member.

[0069] In a preferred embodiment, a check valve 120 is further provided at one end of the limiting shaft 110 away from the rotor 210 for controlling the on / off of the first water channel; the check valve 120 is located inside the connecting member and includes a fixed portion connected to the limiting shaft 110 and a movable portion connected to the connecting member; the movable portion is sleeved on the fixed portion, with an open structure at one end close to the limiting shaft 110 and an input port with a relatively smaller diameter at one end away from the limiting shaft 110; the fixed portion is a variable-diameter structure, with a relatively larger diameter at one end away from the limiting shaft 110 and matching the inner diameter of the input port for controlling the on / off of the input port.

[0070] In this embodiment, a check valve 120 is installed at one end of the limiting shaft 110 away from the rotor 210 for controlling the on / off of the first water channel; the check valve 120 includes a fixed portion and a movable portion that are inserted; a stepped through-hole is provided inside the movable portion, and the diameter at one end away from the limiting shaft 110 is relatively smaller; the fixed portion is located inside the movable portion and is also stepped; the diameter of the fixed portion at one end away from the limiting shaft 110 is relatively larger and matches the small diameter of the stepped through-hole.

[0071] In this embodiment, the fixed portion is fixedly installed at the end of the limiting shaft 110; the movable portion is fixedly installed on the connecting member; when the connecting member drives the limiting sleeve 310 to slide, the on / off relationship of the check valve 120 will also be correspondingly switched.

[0072] In a preferred embodiment, the lead screw 320 is connected to the motor 300 through a coupling 330; an installation seat 340 is sleeved on the coupling 330 and is connected to the installation seat 340 through a bearing; the diameter of the installation seat 340 is relatively smaller than the inner diameter of the housing 100, and a relatively larger outer edge is provided in the middle for positioning and installing with the housing 100; through-holes are evenly arranged along the circumference on the outer edge for the drilling fluid to pass through.

[0073] In this embodiment, the installation seat 340 is fixedly connected to the housing 100 through the outer edge, thereby positioning the lead screw 320 and improving stability; at the same time, through-holes are evenly arranged along the circumference on the outer edge, and both sides of it are in a communicating state.

[0074] In this embodiment, the lead screw 320 is connected to the motor 300 through a coupling 330; the coupling 330 is connected to the installation seat 340 through a bearing, so that it can rotate relative to the installation seat 340 and prevent displacement between it and the installation seat 340.

[0075] In a preferred embodiment, a first sealing sleeve is further installed on the mounting base 340; the first sealing sleeve is sleeved on the connecting piece, on the side of the mounting base 340 away from the motor 300, and forms a main water channel with the housing 100; a sealing ring is further arranged between the connecting piece and the first sealing sleeve for forming a seal with the first sealing sleeve; a matching mounting groove is arranged on the inner wall of one end of the first sealing sleeve away from the mounting base 340 corresponding to the sealing ring.

[0076] In this embodiment, the first sealing sleeve is sleeved on the connecting piece, one end is fixedly connected to the mounting base 340, and one end is hermetically connected to the outer wall of the connecting piece; at the same time, the diameter of the first sealing sleeve is relatively smaller than the inner diameter of the housing 100, thereby forming a main water channel.

[0077] In this embodiment, the connecting piece and the first sealing sleeve are sealed by a sealing ring; a matching mounting groove is arranged on the first sealing sleeve corresponding to the sealing ring; the mounting groove extends circumferentially for preventing relative displacement with the sealing ring.

[0078] In a preferred embodiment, a communication hole is arranged on the connecting piece corresponding to the one-way valve 120; the communication hole is on the side of the sealing ring away from the motor 300 for communicating the main water channel with the first water channel and the second water channel; the number of the communication holes includes a plurality, and the communication holes are uniformly arranged along the axial direction on the connecting piece.

[0079] In this embodiment, the connecting piece has a stepped diameter structure, the part at one end away from the motor 300 and outside the first sealing sleeve has a relatively larger diameter and is sleeved on the limiting shaft; at the same time, a communication hole is further arranged on the connecting piece corresponding to the one-way valve 120; the number of the communication holes includes a plurality, the communication holes are arranged circumferentially on the connecting piece and extend radially, so that the main water channel can be respectively communicated with the first water channel and the second water channel.

[0080] In a preferred embodiment, a centering device 400 is further arranged in the housing 100; the centering device 400 is at the end of the motor 300 away from the limiting shaft 110 and is connected to the mounting base 340 through a second sealing sleeve; a battery 350 is further arranged inside the second sealing sleeve for supplying power to the motor 300.

[0081] In this embodiment, the centering device 400 is installed inside the housing 100, at the end of the motor 300 away from the limiting shaft 110, and a second sealing sleeve is sleeved outside; one end of the second sealing sleeve is fixedly installed on the mounting base 340, thereby also forming protection for the motor 300.

[0082] In this embodiment, a battery 350 is further arranged inside the second sealing sleeve; the battery 350 is between the centering device 400 and the motor 300 for supplying power to the motor 300.

[0083] In a preferred embodiment, a vibration sensor and a processor are further provided in the second sealing sleeve; the vibration sensor is connected to the processor, and is configured to detect the vibration of the drilling tool and transmit the vibration signal to the processor; the processor is also connected to the motor 300, and is configured to convert a specific vibration pattern into a start / stop signal and a forward / reverse rotation signal of the motor 300, and transmit them to the motor 300.

[0084] In this embodiment, the drill pipe and drill tools will generate vibration when rotating. Conversely, when the drill pipe and drill tools stop rotating, the vibration will disappear. By switching the start and stop of the drill pipe and drill tools to generate a specific vibration combination, the positive start signal of the motor 300 can be triggered, thereby limiting the rotation of the rotor.

[0085] In this embodiment, the vibration sensor will also trigger a reverse start signal of the motor 300 by detecting that the drill pipe and drill tool have not vibrated within a specified time, thereby releasing the restriction on the rotor and allowing the drill pipe and drill tool to continue to work normally.

[0086] In a preferred embodiment, an output port is further provided at one end of the rotor 210 away from the motor 300 ; the output port extends in the radial direction of the rotor 210 and is communicated with the extended water channel.

[0087] In this embodiment, the end of the rotor 210 away from the motor 300 is radially provided with an output port connected to the extended water channel, so that the plugging agent transported through the extended water channel can enter the drilling fluid delivery water channel, and then be discharged to the outside of the shell 100 for plugging.

[0088] In a preferred embodiment, a universal joint shaft assembly 500 is further disposed inside the housing 100 ; the universal joint shaft assembly 500 is located at an end of the rotor 210 away from the motor 300 , and is fixedly connected to the rotor 210 .

[0089] In a preferred embodiment, the universal joint shaft assembly 500 is also connected to the transmission shaft assembly 600; the transmission shaft assembly 600 is located at the end of the universal joint shaft assembly 500 away from the rotor 210, and a coaxial flow channel hole is provided inside; the flow channel hole extends radially along the transmission shaft assembly 600 at the end close to the universal joint shaft assembly 500 and passes through the transmission shaft assembly 600.

[0090] In this article, specific examples are used to illustrate the principles and implementation modes of the present invention. The description of the above embodiments is only for helping to understand the method and its core idea of the present invention. The above is only the preferred implementation mode of the present invention. It should be noted that due to the limited nature of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, shall all be regarded as the protection scope of the present invention.

Claims

1. A two-channel downhole tool, characterized in that, Comprising: A housing (100), which extends along a first direction and is internally provided with a coaxial limiting shaft (110); A first water channel is provided coaxially inside the limiting shaft (110). The outer diameter of the limiting shaft (110) is smaller than the inner diameter of the housing (100), and a second water channel is formed between the limiting shaft (110) and the inner wall of the housing (100); A power assembly, which includes a stator (200) fixedly installed on the housing (100) and a rotor (210) connected to the limiting shaft (110); The rotor (210) is rotatably connected to the stator (200), and a matching extended water channel is provided inside the rotor (210) corresponding to the first water channel; A driving mechanism, which includes a motor (300) fixedly installed inside the housing (100) and a limiting sleeve (310) sleeved on the limiting shaft (110); The limiting sleeve (310) is slidably connected to the housing (100). The inner circle of the limiting sleeve (310) is provided with evenly arranged spline rotary limiting insertion teeth along the circumferential direction, and a first limiting plane for restricting rotation is provided on the outer circle of the limiting sleeve (310); Corresponding to the spline rotary limiting insertion teeth on the limiting shaft (110), matching docking teeth are provided to restrict the rotation of the rotor (210); A lead screw (320) is installed at the output end of the motor (300); The limiting sleeve (310) is connected to the lead screw (320) through a matching nut (321); The nut (321) is sleeved on the lead screw (320). A second limiting plane for restricting rotation is provided on the outer circle of the nut (321), and one end of the lead screw (320) far from the motor (300) is connected to the limiting sleeve (310) through a connecting piece; During normal operation, the drilling fluid first enters the second water channel and then passes through between the rotor (210) and the stator (200), thereby driving the relative rotation of the rotor (210); when the rotation of the rotor (210) is restricted, the plugging agent can directly pass through the rotor (210) through the first water channel and the extended water channel for discharging and plugging.

2. The two-channel downhole tool according to claim 1, wherein One end of the limiting shaft (110) far from the rotor (210) is further provided with a one-way valve (120) for controlling the on-off of the first water channel; The one-way valve (120) is located inside the connecting piece and includes a fixed part connected to the limiting shaft (110) and a movable part connected to the connecting piece; The movable part is sleeved on the fixed part. One end of the movable part close to the limiting shaft (110) is an open structure, and an input port with a relatively smaller diameter is provided at the end of the movable part far from the limiting shaft (110); The fixed part is a variable-diameter structure. One end far from the limiting shaft (110) has a relatively larger diameter and is matched with the inner diameter of the input port for controlling the on-off of the input port.

3. The two-channel downhole tool according to claim 2, wherein The lead screw (320) is connected to the motor (300) through a coupling (330). An installation seat (340) is sleeved on the coupling (330) and is connected to the installation seat (340) through a bearing. The diameter of the installation seat (340) is smaller than the inner diameter of the housing (100), and a relatively large outer edge is provided in the middle for positioning and installing with the housing (100). Through holes are evenly arranged in the circumferential direction on the outer edge for the drilling fluid to pass through.

4. The double-channel downhole tool according to claim 3, wherein A first sealing sleeve is further installed on the installation seat (340). The first sealing sleeve is sleeved on the connecting piece, on the side of the installation seat (340) away from the motor (300), and forms a main water channel with the housing (100). A sealing ring is further provided between the connecting piece and the first sealing sleeve for forming a seal with the first sealing sleeve. A matching installation groove is provided on the inner wall at one end of the first sealing sleeve away from the installation seat (340) corresponding to the sealing ring.

5. The double-channel downhole tool according to claim 4, wherein A communication hole is provided on the connecting piece corresponding to the one-way valve (120). The communication hole is on the side of the sealing ring away from the motor (300) for communicating the main water channel with the first water channel and the second water channel. The number of the communication holes includes a plurality, and they are evenly arranged axially on the connecting piece.

6. The double-channel downhole tool according to claim 3, wherein A centralizer (400) is further provided in the housing (100). The centralizer (400) is located at the end of the motor (300) away from the limiting shaft (110) and is connected to the installation seat (340) through a second sealing sleeve. A battery (350) is further provided inside the second sealing sleeve for supplying power to the motor (300).

7. The double-channel downhole tool according to claim 6, wherein A vibration sensor and a processor are further provided inside the second sealing sleeve. The vibration sensor is connected to the processor and is configured to detect the vibration of the drill string and transmit the vibration signal to the processor. The processor is further connected to the motor (300) and is configured to convert a specific vibration law into a start-stop signal and a forward-reverse signal of the motor (300) and transmit them to the motor (300).

8. The double-channel downhole tool according to claim 1, wherein An output port is further provided at one end of the rotor (210) away from the motor (300). The output port extends radially along the rotor (210) and is communicated with the extended water channel.

9. The double-channel downhole tool according to claim 1, wherein A universal shaft assembly (500) is further provided inside the housing (100). The universal shaft assembly (500) is located at the end of the rotor (210) away from the motor (300) and is fixedly connected to the rotor (210).

10. The double-flow downhole tool according to claim 9, wherein the universal shaft assembly (500) is further connected to the transmission shaft assembly (600); the transmission shaft assembly (600) is located at one end of the universal shaft assembly (500) away from the rotor (210), and a coaxial flow channel hole is provided inside; one end of the flow channel hole close to the universal shaft assembly (500) extends along the radial direction of the transmission shaft assembly (600) and penetrates through the transmission shaft assembly (600).

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