A hydraulic reversing device, a continuous tube jet directional drilling system and a method

Abstract

The present invention discloses a hydraulic reversing device, a continuous pipe jet directional drilling system and method. The hydraulic reversing device is provided with a pipe shaft, and at least a first transmission member and a second transmission member are sleeved outside the pipe shaft; a second pipe member is sleeved outside the first transmission member and the second transmission member, and the first transmission member and the second transmission member are respectively meshed with the second pipe member through a spiral gear structure, and the spiral gear directions of the first transmission member and the second transmission member are opposite; the axial movement of the pipe shaft drives the axial movement of the first transmission member or the second transmission member; under the limitation of the spiral gear, the first transmission member or the second transmission member rotates, driving the pipe shaft to rotate. Continuous and automated drilling of drilling holes such as gas extraction drilling holes and water exploration drilling holes in underground coal mines is realized; hydraulic reversing adjustment of the bottom of the tool face of jet directional drilling is realized, solving the disadvantages of difficulty and low precision of indirect adjustment through the orifice drill string; jet continuous drilling is realized, the number of workers and the labor intensity of workers are reduced, and construction safety and comprehensive benefits are improved.

Description

Technical Field

[0001] The invention relates to the field of pit (tunnel) drilling, and in particular to a hydraulic reversing device, a continuous tube jet directional drilling system and a method. Background Art

[0002] At present, underground drilling in coal mines adopts the method of connecting single drill rods to add drill strings, which takes a long time to assist, has high labor intensity and poses safety hazards. Frequently adding rods and stopping pumps (cycle interruption) can easily lead to accidents in the hole. The drilling operation takes a long time to assist, is inefficient, and is not easy to automate. The current gas extraction hole drilling technology has not developed significantly since the 1880s. This traditional labor-intensive underground drilling work has caused many operator injuries, limited drilling efficiency, and increased footage costs and safety costs. Continuous tubing drilling technology can achieve faster and continuous gas extraction hole drilling, greatly reducing manual operations. Continuous flushing medium flow is more conducive to reducing accidents in the hole. The continuous drilling process improves operation automation, reduces misoperation, and improves construction safety. At the same time, since the drilling of gas extraction holes, exploration and drainage holes, and floor grouting reinforcement holes in coal mines requires more drilling target layers, there are higher requirements for accurate control of the trajectory of the entire drilling process and uniform coverage of the target area by drilling holes. Therefore, there is a real need for directional control of continuous tubing drilling.

[0003] At present, the continuous tubing drilling has not yet been fully directional and controllable. The existing technical solution is to adjust the tool surface at the bottom of the hole by rotating the entire continuous tubing drill string to achieve directional control of the continuous drilling.

[0004] The existing technical solutions have the following defects:

[0005] For continuous tubing drilling of deep holes, it is difficult to accurately control the tool surface at the bottom of the hole due to the deflection of the drill string when rotating the entire continuous tubing drill string. The adjustment is difficult, the reliability is low, and the continuous tubing drum needs to rotate with the drill string, and the supporting equipment structure is complex. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the existing continuous tubing drilling technology that cannot be oriented or the existing directional scheme has low reliability, provide a hydraulic reversing device and a directional drilling method for continuous tubing jet directional drilling, and realize efficient directional drilling of continuous tubing jet in coal mines.

[0007] A hydraulic reversing device is provided with a pipe shaft, and at least a first transmission member and a second transmission member are sleeved outside the pipe shaft; a second pipe member is sleeved outside the first transmission member and the second transmission member, and the first transmission member and the second transmission member are respectively meshed with the second pipe member through a spiral gear structure, and the spiral gear directions of the first transmission member and the second transmission member are opposite; the axial movement of the pipe shaft drives the axial movement of the first transmission member and the second transmission member; under the limitation of the spiral gear, the first transmission member or the second transmission member rotates, driving the pipe shaft to rotate.

[0008] Optionally, a third pipe fitting is sleeved outside one end of the pipe shaft, and a spring is sleeved on the pipe shaft inside the third pipe fitting.

[0009] Optionally, a first pipe fitting is sleeved outside the other end of the pipe shaft; a joint is provided at one end of the first pipe fitting, and an end cover is provided at the other end; two sealing grooves are embedded on the inner wall of the first pipe fitting close to the end cover, and a plurality of drainage holes are dug on the first pipe fitting between the sealing grooves.

[0010] Optionally, a stopper is embedded in the tubular shaft, and the stopper is respectively arranged corresponding to the first transmission member and the second transmission member; a first ratchet tooth is arranged on the inner wall of the first transmission member, and a second ratchet tooth is arranged on the inner wall of the second transmission member; the first ratchet tooth and the second ratchet tooth have the same deflection direction.

[0011] Optionally, a first transmission tooth is arranged on the outer wall of the first transmission member, the first transmission tooth is an oblique tooth, and a first internally rotating tooth meshing with the first transmission tooth is arranged on the inner wall of the second tube member.

[0012] Optionally, a second transmission tooth is arranged on the outer wall of the second transmission member, the second transmission tooth is an oblique tooth, and a second internally rotating tooth meshing with the second transmission tooth is arranged on the inner wall of the second tube member.

[0013] Optionally, the first transmission member is a helical gear with multiple groups of right-handed external teeth arranged on the outer periphery, and bearings are respectively embedded at both ends of the first transmission member; the second transmission member is a helical gear with multiple groups of left-handed external teeth arranged on the outer periphery, and bearings are respectively embedded at both ends of the second transmission member.

[0014] A continuous tubing jet directional drilling system, comprising a continuous tubing, a slip connector, a hydraulic reversing device, a hollow cabled drilling measurement probe and a rotating hydraulic nozzle connected in sequence;

[0015] The nozzle body of the rotary hydraulic nozzle is an angled nozzle;

[0016] The hydraulic reversing device is any hydraulic reversing device described in the present invention.

[0017] Optionally, it also includes a coiled tubing machine body, a drum system, an injection head system, a high-pressure pump and a high-pressure hose;

[0018] The coiled tubing operation machine body provides an operation platform and a power source for the drum system and the injection head system;

[0019] The drum system accommodates the coiled tubing in a winding form, and the winding, retraction and release of the coiled tubing are achieved through the self-rotation of the drum;

[0020] The injection head system pushes and pulls the coiled tubing to the bottom of the hole; the high-pressure pump and high-pressure hose are connected to the coiled tubing to provide high-pressure water.

[0021] A coiled tubing jet directional drilling method, wherein the coiled tubing jet directional drilling method adopts the coiled tubing jet directional drilling system of the present invention to realize coiled tubing jet directional drilling, specifically comprising:

[0022] Step 1: Adjust the coiled tubing machine’s hole opening angle according to the drilling design value, and install the coiled tubing front-end drilling tool assembly: slip connector, hydraulic commutator, hollow cabled drilling measurement probe, and rotating hydraulic sprinkler;

[0023] Step 2: According to the designed trajectory, calibrate the tool face angle of the orifice and set the measured hole depth spacing;

[0024] Step 3: Start the high-pressure pump to pump water for hydraulic jet drilling. After drilling to the predetermined hole depth spacing, stop the coiled tubing machine injection head, perform trajectory measurement, and compare the actual drilling trajectory with the designed trajectory to obtain the next tool face adjustment value;

[0025] Step 4: The number of times the pump is opened and closed is calculated based on the preset tool face value, and a command is sent to the high-pressure pump to control the hydraulic reversing device 6 to adjust the tool face of the bottom hole drill tool. The tool face angle value that needs to be adjusted is determined based on the deviation from the designed trajectory. The hydraulic reversing device is driven to rotate by adding and removing pump pressure to drive the tool face angle of the rotating hydraulic nozzle to change. Each time the pressure is added, the tool face angle is rotated to the designed angle. Each time the pressure is removed, the tool face angle is continued to rotate to the designed angle until it rotates to the desired tool face angle and then continues to jet drilling, thereby achieving directional drilling.

[0026] Step 5: Turn on the pump and jet drill again to the predetermined hole depth interval, then repeat steps 3 and 4 to the designed hole depth;

[0027] Step 6: After reaching the designed hole depth, stop the pump and simultaneously start the drum system and injection head system to retract the coiled tubing and drilling tools in the hole.

[0028] Beneficial effects of the present invention:

[0029] (1) Realizes the continuous and automated drilling of gas extraction drilling holes, water exploration and drainage drilling holes, etc. in coal mines;

[0030] (2) It realizes hydraulic reversing adjustment of the tool surface bottom of jet directional drilling, solving the disadvantages of indirect adjustment through the orifice drill string, which is difficult and has low precision;

[0031] (3) Continuous jet drilling is achieved, which reduces the number of workers and their labor intensity, and improves construction safety and overall benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] Figure 1 It is a structural schematic diagram of the continuous tubing jet directional drilling system of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the hydraulic reversing device of the present invention;

[0035] Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure of the first pipe member;

[0036] Figure 4 yes Figure 3 A cross-sectional view of

[0037] Figure 5 yes Figure 2 A cross-sectional view of the structure of the second pipe fitting;

[0038] Figure 6 yes Figure 5 Left view of

[0039] Figure 7 yes Figure 2 A schematic diagram of the structure of the first transmission member, wherein Figure a is a stereogram and Figure b is a right side view;

[0040] Figure 8 yes Figure 2 A schematic diagram of the structure of the second transmission member, wherein Figure a is a stereogram and Figure b is a right side view;

[0041] Fig. 9 yes Figure 2 A schematic diagram of the stopper structure in FIG.

[0042] Fig.10 yes Figure 2 Schematic diagram of the tube axis structure in FIG.

[0043] Fig.11 yes Figure 2 A cross-sectional view of the third pipe fitting structure in FIG.

[0044] The reference numerals in the figure are as follows: 1-coiled tubing locomotive body, 2-drum system, 3-injection head system, 4-coiled tubing, 5-slip connector, 6-hydraulic reversing device, 7-hollow cabled drilling measurement probe, 8-rotating hydraulic sprinkler, 9-measurement signal line, 10-explosion-proof computer, 11-control line, 12-high-pressure pump, 13-high-pressure hose;

[0045] 61-first pipe fitting, 62-second pipe fitting, 63-third pipe fitting, 64-spring, 65-tube shaft, 66-first transmission member, 67-second transmission member, 68-bearing, 69-stop member;

[0046] 611-joint, 612-end cover, 613-first bolt hole, 614-drain hole, 615-sealing groove;

[0047] 621-first internal spiral tooth, 622-second internal spiral tooth, 623-second bolt hole;

[0048] 631-outer edge, 632-third bolt hole, 633-buffer bin, 634-port;

[0049] 651-pipe, 652-retaining ring groove, 653-keyway, 654-flange, 655-end pipe;

[0050] 661-first transmission tooth, 662-first ratchet tooth, 663-first end ring;

[0051] 671 - second transmission tooth, 672 - second ratchet tooth, 673 - second end ring;

[0052] 691-claw body, 692-claw tongue, 693-mounting hole. DETAILED DESCRIPTION

[0053] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0054] Combination Figure 2-11The hydraulic reversing device 6 of the present invention mainly includes the following components: a tube shaft 65 is provided, and at least a first transmission member 66 and a second transmission member 67 are sleeved outside the tube shaft 65; a second tube member 62 is sleeved outside the first transmission member 66 and the second transmission member 67, and the first transmission member 66 and the second transmission member 67 are respectively engaged with the second tube member 62 through a spiral gear structure, and the spiral gear directions of the first transmission member 66 and the second transmission member 67 are opposite; the axial movement of the tube shaft 65 drives the axial movement of the first transmission member 66 and the second transmission member 67; under the limitation of the spiral gear, the rotation of the first transmission member 66 or the second transmission member 67 drives the tube shaft 65 to rotate. The hydraulic reversing device 6 of the present invention mainly converts the axial movement of the pipe shaft 65 into the rotation of the first transmission member 66 and the second transmission member 67. At the same time, since the spiral teeth of the first transmission member 66 and the second transmission member 67 are in opposite directions, the rotation directions of the two are different, and the two will not drive the pipe shaft 65 to rotate at the same time, thereby realizing the forward or reverse rotation of the pipe shaft, realizing angle adjustment, and realizing hydraulic reversing adjustment of the tool surface bottom of jet directional drilling, solving the disadvantages of difficulty and low precision of indirect adjustment through the orifice drill string; realizing jet continuous drilling, reducing the number of workers and the labor intensity of workers, and improving construction safety and comprehensive benefits.

[0055] In the embodiment of the present disclosure, a third pipe 63 is sleeved outside one end of the pipe shaft 65, and a spring 64 is sleeved on the pipe shaft 65 in the third pipe 63. The arrangement of the spring 64 accumulates the compression force of the axial displacement, and when the pipe shaft 65 moves in the reverse direction, the restoring force of the spring 64 can be used to achieve the desired effect.

[0056] In the embodiment of the present disclosure, a first pipe member 61 is sleeved outside the other end of the pipe shaft 65; a joint 611 is provided at one end of the first pipe member 61, and an end cover 612 is provided at the other end; two sealing grooves 615 are embedded on the inner wall of the first pipe member 61 close to the end cover, and a plurality of drainage holes 614 are dug on the first pipe member 61 between the sealing grooves 615. Figure 3 and 4 As shown, the left end of the first pipe fitting 61 is a joint 611 connected to the cava connector 5, and the end cover 612 at the right end is arranged with a plurality of first bolt holes 613 along the circumferential direction and connected to the second pipe fitting 62 through bolts, and two sealing grooves 615 are arranged near the right end for installing sealing rings to seal the gap between the pipe shaft 65 and the first pipe fitting 61, and a plurality of drainage holes 614 are arranged between the two sealing grooves 615.

[0057] The first transmission member 66 is a right-handed helical gear, and a plurality of groups (17 groups in this example) of right-handed external teeth are arranged on the outer periphery, namely the first transmission teeth 661, and the middle of the inside is the ratchet internal teeth, namely the first ratchet teeth 662. The ratchet internal teeth are inclined in the clockwise direction, and the number of ratchet teeth can be determined as needed to control the rotation angle of each tooth. In this example, the number of ratchet internal teeth is 24, and each tooth rotates 15°. A group of bearings 68 are installed on the annular space at both ends of the ratchet internal teeth, namely the first end ring 663, which are preferably self-lubricating bearings.

[0058] The pipe shaft 65 is a hollow tubular structure, and the pipe 651 runs through the entire shaft. Four groups of annular retaining ring grooves 652 are arranged from left to right to accommodate retaining rings. A plurality of rectangular key grooves 653 of non-through pipes 651 are embedded along the circumference of the pipe between the two groups of retaining ring grooves 652 on the left and right sides for accommodating the stopper 69. A flange 654 with an outer diameter larger than the pipe body is provided at the right end to separate the left end pipe body and the right end end pipe 655. The end pipe 655 is connected to the hollow cabled drilling measurement probe 7 and is used to accommodate the spring 64 during assembly. The spring 64 provides the reset force for the pipe shaft 65.

[0059] The left end cover of the third pipe fitting 63 is an outer edge 631 arranged along the circumferential direction, and a plurality of third bolt holes 632 are arranged circumferentially on the outer edge 631. The second pipe fitting 62 is connected by bolts, and the end tube 655 of the pipe shaft 65 and the spring 64 nested thereon are inserted into the buffer bin 633 and passed out from the right side port 634 of the third pipe fitting 63.

[0060] The second transmission member 67 is a left-handed bevel gear, and a plurality of groups (17 groups in this example) of left-handed external teeth are arranged on the outer periphery, namely the second transmission teeth 671, and the middle of the inside is the ratchet internal teeth, namely the second ratchet teeth 672. The ratchet internal teeth are inclined in the clockwise direction, and the number of ratchet teeth can be determined as needed to control the rotation angle of each tooth. In this example, the number of ratchet internal teeth is 24, and each tooth rotates 15°. The annular space at both ends of the ratchet internal teeth, namely the second end ring 673, are each installed with a group of bearings 68, preferably self-lubricating bearings.

[0061] The second pipe fitting 62 is a cylindrical structure, and a plurality of second bolt holes 623 (6 in this example) are arranged on both end faces, wherein the left end is used to connect to the first pipe fitting 61, and the right end is used to connect to the third pipe fitting 63. The first internal spiral teeth 621 and the second internal spiral teeth 622 are symmetrically arranged in the middle of the cylindrical structure. For example, as shown in the figure, the first internal spiral teeth 621 are right-handed internal teeth, and the second internal spiral teeth 622 are left-handed internal teeth, which are respectively engaged with the first transmission teeth 661 of the first transmission member 66 and the second transmission teeth 671 of the second transmission member 67. Lubricating oil or grease can be injected into the interior to reduce the operating resistance of the internal mechanism.

[0062] The stopper 69 includes a claw body 691, a claw tongue 692 and a mounting hole 693. The mounting hole 693 is used to install a small spring. The size and shape of the claw body 691 are consistent with the keyway 653 on the pipe shaft 65. The claw tongue 692 is embedded in the tooth groove of the first ratchet tooth 662 or the second ratchet tooth 672. Since the first transmission tooth 661 and the second transmission tooth 662 have opposite tooth rotation directions and the first ratchet tooth 662 and the second ratchet tooth 672 have the same tooth deflection direction, when the pipe shaft 65 moves axially, the stopper 69 will not be embedded in and brake the first ratchet tooth 662 and the second ratchet tooth 672 at the same time, ensuring that the first transmission member 66 and the second transmission member 67 rotate in opposite directions.

[0063] The working principle of the hydraulic reversing device is as follows: the high-pressure pump 12 is turned on to provide high-pressure water through the high-pressure hose 13, the coiled pipe 4, the slip connector 5, the hydraulic reversing device 6, the hollow cable drilling measurement probe 7 to the rotating hydraulic sprinkler 8 for normal jet drilling. At this time, the rotating hydraulic sprinkler 8 generates a forward driving force under high pressure to pull the hollow cable drilling measurement probe 7 and the pipe shaft 65 of the hydraulic reversing device 6 to move forward, driving the first transmission member 66 and the second transmission member 67 on the shaft to move forward together. The first transmission member 66 on the left end of the pipe shaft 65 is driven by the hydraulic reversing device 6. The first transmission tooth 661 of the transmission member 66 will rotate clockwise along the forward direction of the nozzle when meshing with the first internally rotating tooth 621 of the second pipe member 62, and at the same time, the claw tongue 692 of the stop member 69 is embedded in the tooth groove of the first ratchet tooth 662 to limit its relative rotation with the pipe shaft 65, so that the first transmission member 66 drives the pipe shaft 65 to rotate clockwise together, and at the same time, the second transmission tooth 671 of the second transmission member 67 will rotate counterclockwise along the forward direction of the nozzle when meshing with the second internally rotating tooth 622 of the second pipe member 62, and the stop member 69 will rotate counterclockwise along the forward direction of the nozzle. The claw tongue 692 of the movable member 69 slides on the oblique tooth back of the first ratchet tooth 662 to produce idling, and the second transmission member 67 moves to the right end of the second pipe member 62 and is limited and no longer moves. The spring 64 is compressed to generate storage capacity. In this example, the pipe shaft 65 moves forward to the position and rotates by 15°. When the pressure in the pipeline is relieved, the pipe shaft 65 is pushed to reset under the action of the reset force of the spring 64. At this time, the second transmission tooth 671 of the second transmission member 67 is engaged with the second inner spiral tooth 622 of the second pipe member 62 and moves in the reset direction. It rotates counterclockwise (clockwise in the direction of the nozzle's forward movement), and at the same time, the claw tongue 692 of the stopper 69 is embedded in the tooth groove of the second ratchet tooth 672 to limit its relative rotation with the pipe shaft 65, so that the second transmission member 67 drives the pipe shaft 65 to rotate clockwise, while the first transmission member 66 and the pipe shaft 65 are idle. In this example, the pipe shaft 65 continues to rotate 15° in the direction of the nozzle's forward movement. Therefore, each time the pressure is added or unloaded, the shaft of the hydraulic reversing device drives the bottom hole tool to rotate 15°, thereby realizing the adjustment of the tool surface at the bottom hole.

[0064] The principle of the hydraulic reversing device adjusting the tool face at the bottom of the hole to achieve directional drilling is as follows: during continuous pipe jet drilling, since the rotating hydraulic nozzle 8 has a bend, the jet drilling trajectory is oriented in the direction of the bend, and the direction of the bend is the tool face, and the tool face angle near the nozzle can be measured by the hollow cable drilling measurement probe 7. If the drilling trajectory deviates from the designed trajectory, the drilling trajectory can be changed by controlling the tool face angle (bend direction) of the rotating hydraulic nozzle 8. Before adjusting the tool face angle, the tool face angle, inclination angle, and azimuth angle near the nozzle are measured by the hollow cable drilling measurement probe 7 to determine the current trajectory state and trend, and the tool face angle value to be adjusted is determined according to the deviation from the designed trajectory. The hydraulic reversing device 6 is driven to rotate by adding and unloading pump pressure to drive the tool face angle of the rotating hydraulic nozzle 8 to change, and each time the pressure is added, the tool face angle is rotated by 15°, and each time the pressure is unloaded, the tool face angle continues to rotate by 15° until it rotates to the required tool face angle, thereby achieving directional drilling.

[0065] The coiled tubing jet directional drilling system of the present invention mainly comprises a coiled tubing operation vehicle body 1, a roller system 2, an injection head system 3, a coiled tubing 4, a slip connector 5, a hydraulic reversing device 6, a hollow cabled drilling measurement probe 7, a rotating hydraulic nozzle 8, a measurement signal line 9, an explosion-proof computer 10, a control line 11, a high-pressure pump 12, and a high-pressure hose 13.

[0066] The coiled tubing machine body 1 includes a power pump station, a crawler body, an operating platform, an angle adjustment device, etc., which provide an operating platform, a power source, etc. for the drum system 2 and the injection head system 3.

[0067] The drum system 2 accommodates the continuous pipe 4 in a winding form, and the winding, retraction and delivery of the continuous pipe 4 are achieved through the self-rotation of the drum. The power for driving the rotation of the drum can be provided by a power pump station.

[0068] The injection head system 3 plays the role of pushing and pulling the coiled tubing 4 to the bottom of the hole. During the drilling process, the injection head system 3 can provide a pushing force to send the coiled tubing 4 together with the drilling tool in the hole from the wound drum into the borehole and continue to push the drilling into the hole. When the drilling is completed or when needed, it can provide a pulling force to lift the coiled tubing together with the drilling tool in the hole out of the hole and retract it by winding it around the drum.

[0069] The coiled tubing 4 is connected to the hydraulic reversing device 6 via a slip connector 5 .

[0070] The hollow cabled drilling measurement probe 7 is used to measure the tool angle, inclination and azimuth parameters in the hole and is connected to the explosion-proof computer 10 through a data measurement line.

[0071] The explosion-proof computer 10 measures the drilling trajectory, predicts the tool face, and issues work instructions to the mud pump. It determines the tool face adjustment value through the designed trajectory and the existing trajectory deviation value, then encodes the tool face adjustment value and finally transmits it to the mud pump controller through the control line 11 to realize the tool face adjustment.

[0072] The nozzle body of the rotary hydraulic nozzle 8 is processed with a certain curvature angle to achieve the offset of the jet direction and the axial direction of the drilling hole, thereby achieving the purpose of changing the drilling trajectory.

[0073] The nearly horizontal directional continuous drilling method of the present invention comprises the following steps:

[0074] Step 1: Adjust the hole opening angle of the coiled tubing machine according to the drilling design value, and install the coiled tubing front end drilling tool assembly: slip connector 5, hydraulic commutator 6, hollow cabled drilling measurement probe 7, and rotating hydraulic sprinkler 8;

[0075] Step 2: Input the design trajectory into the explosion-proof computer 10, calibrate the tool face angle of the orifice, and set the measured hole depth spacing;

[0076] Step 3: Start the high-pressure pump 12 to pump water for hydraulic jet drilling. After drilling to the predetermined hole depth spacing, stop the continuous tubing operation machine injection head and perform trajectory measurement. The explosion-proof computer 10 system compares the actual drilling trajectory with the designed trajectory to obtain the next tool face adjustment value.

[0077] Step 4: The number of times the pump is opened and closed is calculated based on the preset tool face value, and a command is sent to the high-pressure pump to control the hydraulic reversing device 6 to adjust the tool face of the bottom hole drill tool. The tool face angle value that needs to be adjusted is determined based on the deviation from the designed trajectory. The hydraulic reversing device 6 is driven to rotate by adding and removing pump pressure to drive the tool face angle of the rotating hydraulic nozzle 8 to change. Each time the pressure is added, the tool face angle is rotated to the designed angle. Each time the pressure is removed, the tool face angle is continued to rotate to the meter angle until it rotates to the desired tool face angle and then continues to jet drilling, thereby achieving directional drilling.

[0078] Step 5: Turn on the pump and jet drill again to the predetermined hole depth interval, then repeat steps 3 and 4 to the designed hole depth;

[0079] Step 6: After reaching the designed hole depth, the pump is stopped, and at the same time, the drum system 2 and the injection head system 3 start to retract the coiled tubing 4 and the drilling tools in the hole.

[0080] Compared with the traditional directional drilling system, the continuous pipe jet directional drilling system in underground coal mines does not need to frequently unscrew and remove the drill rod, so the drilling speed in each shift is faster. At the same time, fewer auxiliary personnel are required during drilling, which saves manpower and is simpler to operate. Due to the simplicity of operation and the continuous characteristics of drilling, it is easier to realize automatic control, which is in line with the development trend of automation, unmanned and intelligent underground coal mines.

[0081] The above is a detailed discussion of the best embodiment in conjunction with the accompanying drawings, which is not intended to limit the present invention. The specific technical features described above can be combined in any suitable form without contradiction, and the present invention does not go into details one by one. Any person skilled in the art may adopt simple modifications or modifications such as arbitrary combination or equivalent replacement of the technical solution without departing from the scope of the technical solution, which does not affect the essence of the technical solution and still belongs to the protection scope of the technical solution represented by the embodiments of the present invention.

Claims

1. A hydraulic reversing device, characterized in that: A tubular shaft (65) is provided, and at least a first transmission member (66) and a second transmission member (67) are sleeved outside the tubular shaft (65); A second tube member (62) is disposed outside the first transmission member (66) and the second transmission member (67); the first transmission member (66) and the second transmission member (67) are respectively meshed with the second tube member (62) via a spiral tooth structure, and the spiral directions of the first transmission member (66) and the second transmission member (67) are opposite; The axial movement of the tube shaft (65) drives the first transmission member (66) and the second transmission member (67) to move axially; under the limitation of the spiral teeth, the first transmission member (66) or the second transmission member (67) rotates to drive the tube shaft (65) to rotate; A stopper (69) is also embedded in the tubular shaft (65), and the stopper (69) is respectively arranged corresponding to the first transmission member (66) and the second transmission member (67); a first ratchet tooth (662) is arranged on the inner wall of the first transmission member (66), and a second ratchet tooth (672) is arranged on the inner wall of the second transmission member (67); the first ratchet tooth (662) and the second ratchet tooth (672) have the same deflection direction; The stopper (69) comprises a claw body (691), a claw tongue (692) and a mounting hole (693). The mounting hole (693) is used to mount a small spring. The claw tongue (692) is embedded in the tooth groove of the first ratchet tooth (662) or the second ratchet tooth (672). When the tubular shaft (65) moves axially, the stopper (69) will not be embedded in and brake the first ratchet tooth (662) and the second ratchet tooth (672) at the same time, thereby ensuring that the first transmission member (66) and the second transmission member (67) rotate in opposite directions.

2. The hydraulic reversing device according to claim 1, characterized in that: A third pipe member (63) is sleeved outside one end of the pipe shaft (65), and a spring (64) is sleeved on the pipe shaft (65) inside the third pipe member (63).

3. The hydraulic reversing device according to claim 2, characterized in that: A first pipe member (61) is sleeved outside the other end of the pipe shaft (65); A joint (611) is provided at one end of the first pipe member (61), and an end cover (612) is provided at the other end; two sealing grooves (615) are embedded on the inner wall of the first pipe member (61) close to the end cover, and a plurality of drainage holes (614) are dug on the first pipe member (61) between the sealing grooves (615).

4. The hydraulic reversing device according to claim 1, 2 or 3, characterized in that: A first transmission tooth (661) is arranged on the outer wall of the first transmission member (66), the first transmission tooth (661) being an oblique tooth, and a first internally spiraling tooth (621) meshing with the first transmission tooth (661) is arranged on the inner wall of the second tube member (62).

5. The hydraulic reversing device according to claim 1, 2 or 3, characterized in that: A second transmission tooth (671) is arranged on the outer wall of the second transmission member (67), the second transmission tooth (671) is an oblique tooth, and a second internally rotating tooth (622) meshing with the second transmission tooth (671) is arranged on the inner wall of the second tube member (62).

6. The hydraulic reversing device according to claim 1, 2 or 3, characterized in that: The first transmission member (66) is a helical gear with a plurality of groups of right-handed external teeth arranged on the outer circumference, and bearings (68) are respectively embedded at both ends of the first transmission member (66); The second transmission member (67) is a helical gear with a plurality of groups of left-handed external teeth arranged on the outer circumference, and bearings (68) are respectively embedded at both ends of the second transmission member (67).

7. A coiled tubing jet directional drilling system, characterized in that: It comprises a continuous pipe (4), a slip connector (5), a hydraulic reversing device (6), a hollow cabled drilling measurement probe (7) and a rotating hydraulic nozzle (8) which are connected in sequence; The nozzle body of the rotating hydraulic nozzle (8) is an angled nozzle; The hydraulic reversing device (6) is the hydraulic reversing device (6) described in any one of claims 1 to 6.

8. The coiled tubing jet directional drilling system according to claim 7, characterized in that: It also includes a coiled tubing machine body (1), a roller system (2), an injection head system (3), a high-pressure pump (12) and a high-pressure hose (13); The coiled tubing operation machine body (1) provides an operation platform and a power source for the drum system (2) and the injection head system (3); The drum system (2) accommodates the continuous tube (4) in a winding form, and realizes winding, retrieving and releasing the continuous tube (4) through the self-rotation of the drum; The injection head system (3) plays the role of pushing and pulling the coiled tubing (4) toward the bottom of the hole; the high-pressure pump (12) and the high-pressure rubber hose (13) are connected to the coiled tubing (4) to provide high-pressure water.

9. A method for directional drilling by continuous tubing jetting, characterized in that: The coiled tubing jet directional drilling method adopts the coiled tubing jet directional drilling system according to claim 7 or 8 to realize the coiled tubing jet directional drilling, and specifically comprises: The first step is to adjust the opening angle of the coiled tubing operation vehicle body (1) according to the drilling design value, and install the front end drilling tool assembly of the coiled tubing (4): a slip connector (5), a hydraulic reversing device (6), a hollow cabled drilling measurement probe (7) and a rotating hydraulic nozzle (8); Step 2: According to the designed trajectory, calibrate the tool face angle of the orifice and set the measured hole depth spacing; Step 3: Start the high-pressure pump (12) to pump water for hydraulic jet drilling. After drilling to a predetermined hole depth interval, stop the coiled tubing operation machine body (1) and perform trajectory measurement. Compare the actual drilling trajectory with the designed trajectory to obtain the next tool face adjustment value. Step 4: The number of times the pump is opened and closed is calculated based on the preset tool face value, and a command is sent to the high-pressure pump (12) to control the hydraulic reversing device (6) to adjust the tool face of the bottom hole drill tool. The tool face angle value that needs to be adjusted is determined based on the deviation from the designed trajectory. The hydraulic reversing device (6) is driven to rotate by adding and removing the pump pressure of the high-pressure pump (12) to drive the tool face angle of the rotating hydraulic nozzle (8) to change. Each time the pressure is added, the tool face angle is rotated to the designed angle. Each time the pressure is removed, the tool face angle continues to be rotated to the designed angle until the desired tool face angle is reached and jet drilling is continued, thereby achieving directional drilling. Step 5: Turn on the high-pressure pump (12) to jet-drill again to a predetermined hole depth interval, and then repeat steps 3 and 4 to the designed hole depth; Step 6: After reaching the designed hole depth, the pump is stopped and the drum system (2) and the injection head system (3) are started to retract the coiled tubing (4) and the drilling tool in the hole.

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