Coiled tubing drilling composite drilling tool string and composite drilling driving joint thereof

Abstract

The invention discloses a coiled tubing drilling composite drilling tool string and a composite drilling driving joint thereof, and relates to the technical field of mine operation equipment. The composite drilling driving joint comprises a drilling barrel of a hollow pipe sleeve structure, a horizontal pushing branch drilling rod, a rotating branch drilling rod, a branch drilling rod connecting piece and a flow controller, and when the composite drilling driving joint is used, when a continuous oil pipe body cannot rotate, normal continuous oil pipe drilling operation is not affected. On the premise of not causing other adverse effects on coiled tubing drilling, the low-speed stepping type rotation action of a tubular column can be increased while high-speed rotation of the screw motor is achieved, that is to say, double rotation of an underground drilling tubular column can be achieved through the composite drilling driving joint, and the purpose of composite drilling of coiled tubing drilling is achieved. And the drilling speed of coiled tubing sidetrack drilling can be increased.

Description

Technical Field

[0001] The present application relates to the technical field of mine operation equipment, and more specifically, to a composite drilling drive joint. In addition, the present application also relates to a coiled tubing drilling composite drill string including the above composite drilling drive joint. Background Art

[0002] The coiled tubing sidetracking technology uses coiled tubing equipment to replace traditional drill pipes for drilling. It is an advanced and important oil drilling technology that can perform various operations without interrupting drilling, can enter the target formation more flexibly, better adapt to complex geological conditions and well conditions, reduce the time and cost of tripping, greatly improve the operation efficiency, and at the same time can reduce the damage to the formation and improve the oil recovery rate of oil wells.

[0003] However, there are difficult-to-break limitations in coiled tubing sidetracking, that is, the coiled tubing body cannot rotate, and it cannot achieve double-rotation composite drilling like conventional drilling by using the rotation of the drill pipe body + the rotation of the downhole positive displacement motor to improve the drilling speed. This limitation makes the drilling speed of coiled tubing sidetracking only reach 1 / 5 to 1 / 10 of the drilling speed of conventional drilling.

[0004] In summary, how to improve the drilling speed of coiled tubing sidetracking is an urgent problem for those skilled in the art at present. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a composite drilling drive joint, and using this composite drilling drive joint can improve the drilling speed of coiled tubing sidetracking.

[0006] Another purpose of the present application is to provide a coiled tubing drilling composite drill string including the above composite drilling drive joint.

[0007] In order to achieve the above purpose, the present application provides the following technical solutions:

[0008] A composite drilling drive joint includes: a drill barrel with a hollow pipe sleeve structure, a flat-push sub-drill pipe, a rotary sub-drill pipe, a sub-drill pipe connector, and a restrictor;

[0009] The distal end of the flat-push sub-drill pipe is inserted into the proximal end inside the drill barrel and can slide along the length direction of the drill barrel;

[0010] The inner end of the rotary sub-drill pipe is inserted into the distal end inside the drill barrel and can rotate unidirectionally around the center line of the drill barrel towards a preset direction, and the outer end of the rotary sub-drill pipe extends outside the drill barrel;

[0011] The sub-drill pipe connector is inserted into the proximal end of the drill barrel and is located between the push sub-drill pipe and the rotary sub-drill pipe. The first end of the sub-drill pipe connector is drivingly connected to the push sub-drill pipe, and the second end is drivingly connected to the rotary sub-drill pipe. The movement of the push sub-drill pipe can drive the rotary sub-drill pipe to rotate through the sub-drill pipe connector, and the inner cavity of the sub-drill pipe connector communicates with the inner cavities of the push sub-drill pipe and the rotary sub-drill pipe to form a mud channel;

[0012] The throttle is conductively connected to the inside of the second end of the sub-drill pipe connector and is used to generate a driving force for driving the push sub-drill pipe to move towards the distal end of the drill barrel.

[0013] Preferably, the push sub-drill pipe includes a piston head, the piston head is closely fitted with the reduced-diameter barrel section of the drill barrel, and the drill barrel has an enlarged-diameter barrel section. The inner diameter of the enlarged-diameter barrel section is larger than that of the reduced-diameter barrel section, and the enlarged-diameter barrel section has an oil drain port;

[0014] It further includes a reset member. The first end of the reset member is installed on the drill barrel, and the second end of the reset member abuts against the rotary sub-drill pipe to push the rotary sub-drill pipe to reset when the piston head moves into the enlarged-diameter barrel section and loses pressure.

[0015] Preferably, the sub-drill pipe connector is of a cylindrical structure;

[0016] The first end of the push sub-drill pipe close to the rotary sub-drill pipe is inserted into the first end of the sub-drill pipe connector, and the first end of the push sub-drill pipe is in spiral linear fit with the first end of the sub-drill pipe connector;

[0017] The first end of the rotary sub-drill pipe close to the push sub-drill pipe is inserted into the second end of the sub-drill pipe connector, and the first end of the rotary sub-drill pipe is in one-way ratchet fit with the second end of the sub-drill pipe connector.

[0018] Preferably, a one-way bearing is sleeved inside the drill barrel, and the rotary sub-drill pipe is inserted into the inner hole of the one-way bearing to limit the rotation of the rotary sub-drill pipe in a preset direction.

[0019] Preferably, the push sub-drill pipe includes a piston rod, the drill barrel includes a first piston outer barrel, the piston rod is slidably inserted into the first piston outer barrel, and the first piston outer barrel has a positioning groove to prevent the push sub-drill from rotating.

[0020] Preferably, it further includes a thrust bearing, and the rotary sub-drill pipe is inserted into the inner hole of the thrust bearing.

[0021] Preferably, the push-rod sub-drill pipe further includes a spiral mandrel, and the piston head, the piston rod and the spiral mandrel are detachably and hermetically connected in sequence; the spiral mandrel is in spiral linear fit with the first end of the sub-drill pipe connector;

[0022] The rotary sub-drill pipe includes a rotary mandrel, an upper bearing mandrel and a lower bearing mandrel which are detachably and hermetically connected in sequence, and the rotary mandrel is in one-way ratchet fit with the second end of the sub-drill pipe connector.

[0023] Preferably, the drill barrel further includes a second piston outer cylinder, a connecting outer cylinder, an upper bearing outer cylinder and a lower bearing outer cylinder;

[0024] The second piston outer cylinder, the first piston outer cylinder, the connecting outer cylinder, the upper bearing outer cylinder and the lower bearing outer cylinder are detachably and hermetically connected in sequence;

[0025] The second piston outer cylinder has the reduced-diameter cylinder section and the enlarged-diameter cylinder section, the reset member is a spring, and the reset member is telescopically sleeved inside the second piston outer cylinder, and the piston rod is inserted inside the reset member and can move along the length direction of the drill barrel;

[0026] The sub-drill pipe connector is rotatably and movably sleeved inside the connecting outer cylinder along the length direction of the drill barrel;

[0027] The one-way bearing is sleeved inside the upper bearing outer cylinder, and a plurality of the one-way bearings are uniformly arranged along the axial direction of the upper bearing outer cylinder;

[0028] The thrust bearing is sleeved inside the lower bearing outer cylinder, and a plurality of the thrust bearings are uniformly arranged along the axial direction of the lower bearing outer cylinder.

[0029] Preferably, the rotary sub-drill pipe further includes a lower sub and a choke nozzle, the first end of the lower sub is threadedly connected to the lower bearing mandrel, the second end of the lower sub protrudes and abuts against the lower bearing outer cylinder, and the restrictor is inserted inside the second end of the lower sub.

[0030] A coiled tubing drilling composite drill string includes a coiled tubing, a connector, a downhole safety valve, a downhole safety release, a positive displacement motor and a drill bit, and further includes the composite drilling drive joint according to any one of the above;

[0031] The coiled tubing, the connector, the downhole safety valve, the downhole safety release, the composite drilling drive joint and the positive displacement motor are connected in a conducting sequence, and the drill bit is connected to the output end of the positive displacement motor.

[0032] In this application, the drill pipe, the push-rod sub-drill pipe, the rotary sub-drill pipe, and the sub-drill pipe connector are all hollow pipe sleeve structures. Among them, the lower rod section of the push-rod sub-drill pipe is inserted inside the upper barrel section of the drill pipe, the upper rod section of the rotary sub-drill pipe is inserted inside the lower barrel section of the drill pipe, the sub-drill pipe connector is inserted inside the middle barrel section of the drill pipe, the bottom end of the push-rod sub-drill pipe is connected to the top end of the sub-drill pipe connector in a conductive manner, the top end of the rotary sub-drill pipe is connected to the bottom end of the rotary sub-drill pipe in a conductive manner, and the throttle is connected to the bottom end of the rotary sub-drill pipe in a conductive manner to form a complete mud channel for transporting mud.

[0033] Moreover, both the upper end of the drill pipe and the upper end of the push-rod sub-drill pipe are provided with grouting ports to be able to inject mud into the drill pipe and the push-rod sub-drill pipe.

[0034] To drive the drill bit to rotate through the drill pipe, the push-rod sub-drill pipe can slide vertically, and the rotary sub-drill pipe can rotate around the center line extending in the vertical direction. Correspondingly, the top end of the sub-drill pipe connector is drivingly connected to the bottom end of the push-rod sub-drill pipe, and the bottom end of the sub-drill pipe connector is drivingly connected to the top end of the rotary sub-drill pipe. The sub-drill pipe connector receives the vertical movement of the push-rod sub-drill pipe and, driven by this movement, drives the rotary sub-drill pipe to rotate around its own center line extending in the vertical direction.

[0035] During use, connect the drill bit to the output end of the positive displacement motor, connect the rotary sub-drill pipe of this compound drilling drive joint to the input end of the positive displacement motor, make the throttle communicate with the inlet of the positive displacement motor, and connect a mud pump to the top end of this compound drilling drive joint through a coiled tubing in a conductive manner. Then, start the mud pump to continuously supply drilling mud. When the mud passes through the throttle, it will generate a throttling pressure to push the push-rod sub-drill pipe to move towards the direction close to the distal end of the drill pipe. The sub-drill pipe connector is driven by the push-rod sub-drill pipe to rotate a preset angle in the preset direction, and the rotary sub-drill pipe is driven by the sub-drill pipe connector to rotate a preset angle in the preset direction. Furthermore, the positive displacement motor is driven by the rotary sub-drill pipe to rotate a preset angle in the preset direction. Finally, the drill bit is driven by the positive displacement motor to rotate a preset angle in the preset direction.

[0036] The beneficial effect is that when the coiled tubing body cannot rotate, and without affecting the normal coiled tubing drilling operation and causing other adverse effects on coiled tubing drilling, it is possible to achieve an additional low-speed step-by-step rotation action of the pipe string while the positive displacement motor rotates at a high speed. That is, through this compound drilling drive joint, the downhole drilling pipe string can achieve double rotation, achieving the purpose of coiled tubing drilling compound drilling, breaking through the bottleneck of coiled tubing sidetracking technology, playing a role in increasing the mechanical drilling rate, being able to further improve the construction efficiency, and being conducive to promoting the sustainable development of the coiled tubing sidetracking technology industrialization. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0038] Figure 1 Partial usage structure schematic diagram of a specific embodiment provided by the present application;

[0039] Figure 2 Partial usage schematic diagram of the remaining part of a specific embodiment provided by the present application;

[0040] Figure 3 Schematic diagram of the structure of a specific embodiment provided by the present application;

[0041] Figure 4 For Figure 3 Enlarged schematic diagram at position A in

[0042] Figure 5 For Figure 3 Enlarged schematic diagram at position B in

[0043] Figure 6 For Figure 5 X - X cross - section schematic diagram in

[0044] Figure 7 For Figure 3 Enlarged schematic diagram at position C in

[0045] Figure 8 For Figure 5 Y - Y cross - section schematic diagram in

[0046] Figure 9 For Figure 3 Enlarged schematic diagram at position D in

[0047] Figure 10 For Figure 3 Enlarged schematic diagram at position E in

[0048] Reference numerals:

[0049] 1 - Composite drilling drive joint;

[0050] 11 - Drill pipe; 111 - First piston outer cylinder; 112 - Second piston outer cylinder; 1121 - Diameter - expanding cylinder section; 11211 - Oil drain port; 113 - Connecting outer cylinder; 114 - Upper bearing outer cylinder; 115 - Lower bearing outer cylinder;

[0051] 12 - Thrust sub - drill pipe; 121 - Piston head; 122 - Piston rod; 123 - Spiral mandrel;

[0052] 13 - Rotary sub - drill pipe; 131 - Rotary mandrel; 132 - Upper bearing mandrel; 133 - Lower bearing mandrel; 134 - Lower sub - joint;

[0053] 14 - Throttle;

[0054] 15 - Sub - drill pipe connector;

[0055] 16 - Reset part;

[0056] 17 - One - way bearing;

[0057] 18 - Thrust bearing;

[0058] 2 - Directional screw motor;

[0059] 3 - Drill bit. Specific embodiments

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0061] The core of the present application is to provide a composite drilling drive joint, and using this composite drilling drive joint can improve the drilling speed of coiled tubing sidetracking. Another core of the present application is to provide a coiled tubing drilling composite drill string including the above - mentioned composite drilling drive joint.

[0062] Please refer to Figure 1, the present application provides a compound drilling drive joint, including a drill barrel 11 with a hollow tube sleeve structure, a flat-pushing sub-drill rod 12, a rotating sub-drill rod 13, a sub-drill rod connector 15 and a throttle 14; wherein, the distal end of the flat-pushing sub-drill rod 12 is inserted into the proximal end inside the drill barrel 11 and can slide along the length direction of the drill barrel 11; the inner end of the rotating sub-drill rod 13 is inserted into the distal end inside the drill barrel 11 and can rotate unidirectionally around the center line of the drill barrel 11 towards a preset direction, and the outer end of the rotating sub-drill rod 13 extends out of the drill barrel 11; the sub-drill rod connector 15 is inserted into the proximal end inside the drill barrel 11 and is located between the flat-pushing sub-drill rod 12 and the rotating sub-drill rod 13. The first end of the sub-drill rod connector 15 is drivingly connected to the flat-pushing sub-drill rod 12, and the second end is drivingly connected to the rotating sub-drill rod 13. The movement of the flat-pushing sub-drill rod 12 can drive the rotating sub-drill rod 13 to rotate through the sub-drill rod connector 15, and the inner cavity of the sub-drill rod connector 15 communicates with the inner cavities of the flat-pushing sub-drill rod 12 and the rotating sub-drill rod 13 to form a mud channel; the throttle 14 is conductively connected to the inside of the second end of the sub-drill rod connector 15 and is used to generate a driving force for driving the flat-pushing sub-drill rod 12 to move towards the distal end of the drill barrel 11.

[0063] As Figure 1 , Figures 3 to 10 As shown, the drill barrel 11, the flat-pushing sub-drill rod 12, the rotating sub-drill rod 13 and the sub-drill rod connector 15 are all of hollow tube sleeve structures. Among them, the lower rod section of the flat-pushing sub-drill rod 12 is inserted inside the upper barrel section of the drill barrel 11, the upper rod section of the rotating sub-drill rod 13 is inserted inside the lower barrel section of the drill barrel 11, the sub-drill rod connector 15 is inserted inside the middle barrel section of the drill barrel 11, the bottom end of the flat-pushing sub-drill rod 12 is conductively connected to the top end of the sub-drill rod connector 15, the top end of the rotating sub-drill rod 13 is conductively connected to the bottom end of the rotating sub-drill rod 13, and the throttle 14 is conductively connected to the bottom end of the rotating sub-drill rod 13 to form a complete mud channel for transporting mud.

[0064] In particular, both the upper end of the drill barrel 11 and the upper end of the flat-pushing sub-drill rod 12 have grouting ports to be able to inject mud into the drill barrel 11 and the flat-pushing sub-drill rod 12.

[0065] To rotate the drill bit 3 by pushing the drill rod, the flat-pushing sub-drill rod 12 can slide vertically, and the rotating sub-drill rod 13 can rotate around the center line extending in the vertical direction. Correspondingly, the top end of the sub-drill rod connector 15 is drivingly connected to the bottom end of the flat-pushing sub-drill rod 12, and the bottom end of the sub-drill rod connector 15 is drivingly connected to the top end of the rotating sub-drill rod 13. The sub-drill rod connector 15 receives the vertical movement of the flat-pushing sub-drill rod 12 and drives the rotating sub-drill rod 13 to rotate around its own center line extending in the vertical direction under the drive of this movement.

[0066] During use, as Figure 1 and Figure 2As shown, the drill bit 3 is connected to the output end of the positive displacement motor 2, and the rotary sub-drill pipe 13 of the compound drilling drive joint 1 is connected to the top of the positive displacement motor 2, such that the bottom opening of the restrictor 14 communicates with the inlet of the positive displacement motor 2. Then, a mud pump is connected through a coiled tubing at the top of the compound drilling drive joint 1. Next, the mud pump is started to continuously supply drilling mud. When the mud passes through the restrictor 14, a throttling pressure is generated to push the push sub-drill pipe 12 downward. The sub-drill pipe connector 15 is driven by the push sub-drill pipe 12 to rotate a preset angle in the clockwise or counterclockwise direction relative to Figure 6 and Figure 8 The rotary sub-drill pipe 13 is driven by the sub-drill pipe connector 15 to rotate a preset angle in the clockwise or counterclockwise direction relative to Figure 6 and Figure 8 Furthermore, the positive displacement motor 2 is driven by the rotary sub-drill pipe 13 to rotate a preset angle in the clockwise or counterclockwise direction relative to Figure 6 and Figure 8 Finally, the drill bit 3 is driven by the positive displacement motor 2 to rotate a preset angle in the clockwise or counterclockwise direction relative to Figure 6 and Figure 8 That is, when the coiled tubing body cannot rotate, without affecting normal coiled tubing drilling operations and causing other adverse effects on coiled tubing drilling, it is possible to achieve a low-speed step-by-step rotation action of the pipe string while the positive displacement motor rotates at high speed. That is, through the compound drilling drive joint 1, the downhole drilling pipe string can achieve dual rotation, achieving the purpose of coiled tubing drilling compound drilling, breaking through the bottleneck of coiled tubing sidetracking technology, playing a role in increasing the mechanical drilling rate, further improving the construction efficiency, and being conducive to promoting the sustainable development of the coiled tubing sidetracking technology industry.

[0067] In some specific embodiments, the drill barrel 11 is of an integrally formed structure. Or, in some other specific embodiments, the drill barrel 11 includes several barrel sections, and the several barrel sections are hermetically connected by welding or sealing connection and other means.

[0068] In some specific embodiments, the bottom end of the push sub-drill pipe 12 is inserted into the top end interior of the sub-drill pipe connector 15, and a second reset member 16 is sleeved outside the bottom end of the push sub-drill pipe 12 and inside the top end of the sub-drill pipe connector 15. The top end of the second reset member 16 is connected to the push sub-drill pipe 12, and the bottom end is connected to the sub-drill pipe connector 15 to push the push sub-drill pipe 12 to reset. Refer to Figures 1 to 10In the shown orientation, the push-feed sub-drill rod 12 is pushed upward to reset; inside the bottom end of the sub-drill rod connector 15, there are movable first and second driving ends. The top end of the rotary sub-drill rod 13 has a first driving rod section and a second driving rod section from top to bottom. The outer part of the first driving rod section has a number of positive rotation channels, and the outer part of the second driving rod section has a number of reverse rotation channels. Both the positive rotation channels and the reverse rotation channels are spiral grooves. The first driving end can be selectively inserted into or withdrawn from the corresponding positive rotation channels, and the second driving end can be selectively inserted into or withdrawn from the corresponding reverse rotation channels. When in use, when the push-feed sub-drill rod 12 moves downward, the first driving end is sequentially inserted into and then withdrawn from each positive rotation channel from top to bottom, while the second driving end is inserted into the corresponding reverse rotation channel and slides along the extending direction of the reverse rotation channel. Then, the second resetting member 16 pushes the push-feed sub-drill rod 12 upward to reset. During the upward movement of the push-feed sub-drill rod 12, the first driving end is inserted into the corresponding positive rotation channel and slides along the extending direction of the positive rotation channel, while the second driving end is sequentially inserted into and then withdrawn from each reverse rotation channel from bottom to top. Thus, the rotary sub-drill rod 13 is rotated by a preset angle in a preset direction, then stops rotating, and then the processes of rotation and stop are repeated to achieve the step-by-step movement of the rotary sub-drill rod 13.

[0069] As Figure 1 , Figure 3 and Figure 4 shown, on the basis of the above embodiment, the push-feed sub-drill rod 12 includes a piston head 121. The piston head 121 is in close fit with the reduced-diameter cylinder section of the drill barrel 11, and the drill barrel 11 has an enlarged-diameter cylinder section 1121. The inner diameter of the enlarged-diameter cylinder section 1121 is larger than that of the reduced-diameter cylinder section, and the enlarged-diameter cylinder section 1121 has an oil drain port 11211; it also includes a resetting member 16. The first end of the resetting member 16 is installed on the drill barrel 11, and the second end of the resetting member 16 abuts against the rotary sub-drill rod 13 to push the rotary sub-drill rod 13 to reset when the piston head 121 moves into the enlarged-diameter cylinder section 1121 and loses pressure.

[0070] Specifically, the piston head 121 of the push-feed sub-drill rod 12 is in close fit with the inner wall of the top cylinder section of the drill barrel 11, and the drill barrel 11 has an enlarged-diameter cylinder section 1121. The inner diameter of the enlarged-diameter cylinder section 1121 is larger than that of the top cylinder section of the drill barrel 11. When the piston head 121 slides into the enlarged-diameter cylinder section 1121, there is a gap between the piston head 121 and the inner wall of the enlarged-diameter cylinder section 1121, that is, the piston head 121 loses the sealing effect, so the piston head 121 loses the thrust, and then the resetting member 16 will make the push-feed sub-drill rod 12 slide upward to reset.

[0071] It should be noted that the type of the reset member 16 is not limited as long as the above functions can be achieved. For example, in some specific embodiments, the reset member 16 can be a spring sleeved outside the flat-thrust sub-drill pipe 12, with one end of the spring abutted against the drill barrel 11 and the other end abutted against the flat-thrust sub-drill pipe 12. Or, in some specific embodiments, the reset member 16 can include two like-pole magnets, one magnetic pole fixed at a preset position of the drill barrel 11 and the other fixed to the piston head 121.

[0072] During use, referring to Figure 1 and Figure 2 the orientations shown, during the process that the mud pushes the flat-thrust sub-drill pipe 12 to move downward, the cavity formed by enclosing the upper end surface of the piston head 121 and the reduced-diameter barrel section will also be filled with mud. After the piston head 121 of the flat-thrust sub-drill pipe 12 moves downward until the whole piston head 121 enters the expanded-diameter barrel section 1121, the mud in the cavity formed by enclosing the upper end surface of the piston head 121 and the reduced-diameter barrel section will flow through the gap between the piston head 121 and the drill barrel 11 and flow into the annulus from the oil drain port 11211, so that the throttling pressure disappears. The reset member 16 pushes the piston head 121, causing the flat-thrust sub-drill pipe 12 to move upward. The movement of the flat-thrust sub-drill pipe 12 will drive the sub-drill pipe connecting member 15 to rotate a preset angle in the direction opposite to the preset direction. However, since the sub-drill pipe connecting member 15 is restricted from rotating in the direction opposite to the preset direction; when the piston head 121 of the flat-thrust sub-drill pipe 12 moves upward and retracts into the reduced-diameter barrel section, the drilling mud is sealed inside the compound drilling drive joint 1 again, that is, the cavity formed by enclosing the upper end surface of the piston head 121 and the reduced-diameter barrel section will block the mud, and a throttling pressure will be generated again through the throttle 14. When the throttling pressure is greater than the thrust of the reset member 16, the throttling pressure will push the piston head 121 downward again to repeat the steps of pushing the drill bit 3 to rotate and resetting the flat-thrust sub-drill pipe 12. Furthermore, the compound drilling drive joint 1 can drive the drill bit 3 to form a compound drilling function of rotating at a low speed, step by step, and in the preset direction through the downhole motor 2, so that the downhole drill string realizes double rotation, achieving the purpose of coiled tubing drilling compound drilling.

[0073] As Figure 1 , Figure 3 , Figure 7 and Figure 8 shown, on the basis of the above embodiments, the sub-drill pipe connecting member 15 is a cylindrical structure; the first end of the flat-thrust sub-drill pipe 12 close to the rotating sub-drill pipe 13 is inserted into the first end of the sub-drill pipe connecting member 15, and the first end of the flat-thrust sub-drill pipe 12 is in spiral linear fit with the first end of the sub-drill pipe connecting member 15; the first end of the rotating sub-drill pipe 13 close to the flat-thrust sub-drill pipe 12 is inserted into the second end of the sub-drill pipe connecting member 15, and the first end of the rotating sub-drill pipe 13 is in one-way ratchet fit with the second end of the sub-drill pipe connecting member 15.

[0074] Specifically, the split drill pipe connector 15 is a hollow cylindrical structure. The inner wall of the upper end of the split drill pipe connector 15 has internal threads. Correspondingly, the lower end of the push drill pipe 12 has external threads and is inserted into the inside of the upper end of the split drill pipe connector 15 to be in spiral linear fit with the upper end of the split drill pipe connector 15. The inner wall of the lower end of the split drill pipe connector 15 is provided with rotatable pawls. The outer wall of the upper end of the rotary drill pipe 13 has ratchet teeth. The rotary drill pipe 13 is inserted into the inside of the lower end of the split drill pipe connector 15 to be in one-way ratchet fit with the lower end of the split drill pipe connector 15.

[0075] During use, the downward movement of the push drill pipe 12 can drive the split drill pipe connector 15 to rotate a preset angle in the preset direction, and the split drill pipe connector 15 drives the rotary drill pipe 13 to rotate in the preset direction. On the contrary, when the push drill pipe 12 moves upward, it will drive the split drill pipe connector 15 to rotate a preset angle in the direction opposite to the preset direction. Since the rotary drill pipe 13 is in one-way ratchet fit with the split drill pipe connector 15, the split drill pipe connector 15 and the rotary drill pipe 13 are fixed.

[0076] In summary, the composite drilling drive joint 1 can withstand reverse torque, will not rotate counterclockwise, can ensure that the drilling string will not become loose, and does not require electronic control or other complex control means, with simple operation, low cost, and high reliability.

[0077] To restrict the rotary drill pipe 13, as shown in Figure 1 、 Figure 3 and Figure 9 On the basis of the above embodiments, a one-way bearing 17 is sleeved inside the drill barrel 11, and the rotary drill pipe 13 is inserted into the inner hole of the one-way bearing 17 to restrict the rotary drill pipe 13 from rotating in the preset direction.

[0078] Specifically, a one-way bearing 17 is sleeved inside the drill barrel 11, and the rotary drill pipe 13 is inserted into the inside of the one-way bearing 17. The one-way bearing 17 can adopt a needle roller one-way bearing 17, a ball one-way bearing 17, etc., so as to be able to restrict the rotary drill pipe 13 from rotating only in the preset direction through the one-way bearing 17 and not in the direction opposite to the preset direction, and can more stably support the rotary drill pipe 13 to ensure the smooth rotation of the rotary drill pipe 13.

[0079] In some specific embodiments, the rotary drill pipe 13 can only rotate in the clockwise direction relative to Figure 6 and Figure 8 and cannot rotate counterclockwise relative to Figure 6 and Figure 8 , and cannot move axially along the drill barrel 11.

[0080] In some specific embodiments, the rotary sub-drill rod 13 can only rotate in the counterclockwise direction relative to Figure 6 and Figure 8 , and cannot rotate in the clockwise direction relative to Figure 6 and Figure 8 , nor can it move axially along the drill barrel 11.

[0081] It should be noted that the number of one-way bearings 17 is not limited, as long as the support and restraint functions can be achieved. Preferably, a number of one-way bearings 17 are evenly arranged along the axial direction of the drill barrel 11.

[0082] To restrain the flat-thrust sub-drill rod 12 from rotating, as shown in Figure 1 , Figure 3 , Figure 5 and Figure 6 , on the basis of the above embodiments, the flat-thrust sub-drill rod 12 includes a piston rod 122, and the drill barrel 11 includes a first piston outer cylinder 111. The piston rod 122 is slidably inserted into the first piston outer cylinder 111, and the first piston outer cylinder 111 has a positioning groove for preventing the flat-thrust sub-drill from rotating.

[0083] In some specific embodiments, the positioning groove can adopt a flat key groove that runs through the length direction of the first piston outer cylinder 111.

[0084] In some specific embodiments, the positioning groove includes a number of triangular grooves evenly distributed around the center line of the first piston outer cylinder 111. At this time, the piston rod 122 and the first piston outer cylinder 111 are polygonally matched, so that the piston rod 122 can only move axially along the drill barrel 11 and cannot rotate.

[0085] To improve the stability of the rotary sub-drill rod 13, as shown in Figure 1 , Figure 3 , Figure 5 and Figure 6 , on the basis of the above embodiments, a thrust bearing 18 is further included. The rotary sub-drill rod 13 is inserted into the inner hole of the thrust bearing 18, and the thrust bearing 18 can adopt an angular contact thrust bearing 18, a thrust ball bearing, etc.

[0086] It should be noted that the number of thrust bearings 18 is not limited, as long as the support and restraint functions can be achieved. Preferably, a number of thrust bearings 18 are evenly arranged along the axial direction of the drill barrel 11.

[0087] To achieve the above functions of the flat-thrust sub-drill rod 12 and the rotary sub-drill rod 13 while reducing the manufacturing difficulty, as shown in Figure 1 , Figures 3 to 5 , Figure 7 , Figure 9 and Figure 10As shown, on the basis of the above embodiments, the push drill pipe 12 further includes a spiral mandrel 123, and the piston head 121, the piston rod 122, and the spiral mandrel 123 are detachably and hermetically connected in sequence; the spiral mandrel 123 is in spiral linear fit with the first end of the drill pipe connector 15; the rotary drill pipe 13 includes a rotary mandrel 131, an upper bearing mandrel 132, and a lower bearing mandrel 133 that are detachably and hermetically connected in sequence, and the rotary mandrel 131 is in one-way ratchet fit with the second end of the drill pipe connector 15.

[0088] Specifically, the piston head 121, the piston rod 122, and the spiral mandrel 123 are connected in sequence from top to bottom to form a complete push drill pipe 12, and the piston head 121 is hermetically connected to the piston rod 122, and the piston rod 122 is hermetically connected to the spiral mandrel 123, such as by threaded connection or clamp connection, etc., so that the overall cavity formed by the sequential connection of the piston head 121, the piston rod 122, and the spiral mandrel 123 is independent of the inner cavity of the drill barrel 11; similarly, the rotary mandrel 131, the upper bearing mandrel 132, and the lower bearing mandrel 133 are connected in sequence from top to bottom to form a rotary drill pipe 13, and the rotary mandrel 131 is hermetically connected to the upper bearing mandrel 132, and the upper bearing mandrel 132 is hermetically connected to the lower bearing mandrel 133, such as by threaded connection or clamp connection, etc., so that the overall cavity formed by the sequential connection of the rotary mandrel 131, the upper bearing mandrel 132, and the lower bearing mandrel 133 is independent of the inner cavity of the drill barrel 11.

[0089] Correspondingly, the lower end of the spiral mandrel 123 has an external thread and is inserted into the upper end of the drill pipe connector 15 to achieve spiral linear fit with the upper end of the drill pipe connector 15; the inner wall of the upper end of the rotary mandrel 131 is provided with a rotatable ratchet pawl and is inserted into the lower end of the drill pipe connector 15 to achieve one-way ratchet fit with the lower end of the drill pipe connector 15.

[0090] While realizing the above various functions of the drill barrel 11, to reduce the manufacturing difficulty, as Figure 1 、 Figures 3 to 5 、 Figure 7 、 Figure 9 and Figure 10 shown, on the basis of the above embodiments, the drill barrel 11 further includes a second piston outer cylinder 112, a connecting outer cylinder 113, an upper bearing outer cylinder 114, and a lower bearing outer cylinder 115.

[0091] Specifically, the second piston outer cylinder 112, the first piston outer cylinder 111, the connecting outer cylinder 113, the upper bearing outer cylinder 114, and the lower bearing outer cylinder 115 are detachably and hermetically connected in sequence from top to bottom, such as by threaded connection or clamp connection, etc., so that the rotation angle of the composite drilling drive joint 1 is adjustable, suitable for the drilling requirements of different sizes of pipe strings, different specifications of drill bits 3, and different formations, with wide applicability, and making a great contribution to expanding the business scope of coiled tubing.

[0092] The second piston outer cylinder 112 has the above-mentioned expanded-diameter cylinder section 1121 and reduced-diameter cylinder section, and the reduced-diameter cylinder section is located above the expanded-diameter cylinder section 1121. The reset member 16 is a vertically extending spring, and the reset member 16 is telescopically sleeved inside the second piston outer cylinder 112. The piston rod 122 is inserted into the reset member 16 and can move vertically. When in use, the piston rod 122 moves freely up or down inside the reset member 16. When the piston head 121 moves downward into the expanded-diameter cylinder section 1121, the reset member 16 is compressed and extends in the expanded-diameter cylinder section 1121. When the piston head 121 moves upward and resets to the reduced-diameter cylinder section, the reset member 16 is in an extended state and extends in the expanded-diameter cylinder section 1121 and the reduced-diameter cylinder section.

[0093] The sub-drill pipe connector 15 is rotatably and movably sleeved inside the connecting outer cylinder 113 along the length direction of the drill cylinder 11.

[0094] The one-way bearing 17 is sleeved inside the upper bearing outer cylinder 114, and a plurality of one-way bearings 17 are evenly arranged along the axial direction of the upper bearing outer cylinder 114.

[0095] The thrust bearing 18 is sleeved inside the lower bearing outer cylinder 115, and a plurality of thrust bearings 18 are evenly arranged along the axial direction of the lower bearing outer cylinder 115.

[0096] As Figure 1 、 Figure 3 and Figure 10 shown, on the basis of the above-mentioned embodiment, the rotary sub-drill pipe 13 further includes a lower joint 134 and a throttle nozzle. The upper end of the lower joint 134 is inserted into the lower bearing outer cylinder 115 and is threadedly connected to the lower end of the lower bearing core shaft 133. The lower end of the lower joint 134 extends downward outside the lower bearing outer cylinder 115. The lower joint 134 has a stepped structure, and the outer diameter of the cylinder section of the lower joint 134 located outside the lower bearing outer cylinder 115 is larger than the outer diameter of the cylinder section of the lower joint 134 located inside the lower bearing outer cylinder 115. The stepped surface of the lower joint 134 abuts against the lower end surface of the lower bearing outer cylinder 115. During assembly, from top to bottom, insert the upper end of the lower joint 134 into the lower bearing outer cylinder 115 and rotate the lower joint 134 to threadedly connect it to the lower bearing core shaft 133 until the stepped surface of the lower joint 134 abuts against the upper surface of the lower bearing outer cylinder 115.

[0097] The throttle 14 is inserted into the lower end of the lower joint 134 and is fixedly connected to the lower joint 134, so that when the mud flows through the throttle 14, it can generate a throttling pressure.

[0098] Preferably, in some specific embodiments, the piston head 121, the piston rod 122, and the screw mandrel 123 are threadedly connected in sequence; the rotating mandrel 131, the upper bearing mandrel 132, the lower bearing mandrel 133, the lower sub 134, and the choke nozzle are threadedly connected in sequence; the second piston outer cylinder 112, the first piston outer cylinder 111, the connecting outer cylinder 113, the upper bearing outer cylinder 114, and the lower bearing outer cylinder 115 are threadedly connected in sequence.

[0099] In addition to the above-mentioned compound drilling drive joint, the present application also provides a coiled tubing drilling compound drill string including the compound drilling drive joint 1 disclosed in the above embodiment. The coiled tubing drilling compound drill string further includes a coiled tubing, a connector, a downhole safety valve, a downhole safety release, a positive displacement motor 2, and a bit 3. The coiled tubing, the connector, the downhole safety valve, the downhole safety release, the compound drilling drive joint 1, and the positive displacement motor 2 are connected in sequence and conductively, and the bit 3 is connected to the output end of the positive displacement motor 2.

[0100] Based on the above embodiment, the downhole safety release is conductively connected to the compound drilling drive joint 1 through a hydraulic oscillator to increase the drilling speed and improve the drilling efficiency.

[0101] Based on the above embodiment, the compound drilling drive joint 1 is conductively connected to the positive displacement motor 2 through a measuring instrument to detect and obtain the working conditions of the coiled tubing drilling compound drill string.

[0102] It should be noted that the relational terms such as "first" and "second" described above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities; the "upper surface, lower surface, top, bottom" and the orientation terms "upper, lower, left, right" described above are all defined based on the accompanying drawings of the specification.

[0103] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] The above has introduced in detail the coiled tubing drilling compound drill string and its compound drilling drive joint provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A compound drilling drive joint, characterized in that, Comprising: A drill barrel (11) with a hollow tube sleeve structure, a push sub-drill pipe (12), a rotary sub-drill pipe (13), a sub-drill pipe connector (15), and a restrictor (14); The distal end of the push sub-drill pipe (12) is inserted into the proximal end interior of the drill barrel (11) and can slide along the length direction of the drill barrel (11); The inner end of the rotary sub-drill pipe (13) is inserted into the distal end interior of the drill barrel (11) and can rotate unidirectionally around the center line of the drill barrel (11) towards a preset direction, and the outer end of the rotary sub-drill pipe (13) extends out of the drill barrel (11); The sub-drill pipe connector (15) is inserted into the proximal end interior of the drill barrel (11) and is located between the push sub-drill pipe (12) and the rotary sub-drill pipe (13). The first end of the sub-drill pipe connector (15) is drivingly connected to the push sub-drill pipe (12), and the second end is drivingly connected to the rotary sub-drill pipe (13). The movement of the push sub-drill pipe (12) can drive the rotary sub-drill pipe (13) to rotate through the sub-drill pipe connector (15), and the inner cavity of the sub-drill pipe connector (15) communicates with the inner cavities of the push sub-drill pipe (12) and the rotary sub-drill pipe (13) to form a mud channel; The restrictor (14) is conductively connected to the interior of the second end of the sub-drill pipe connector (15) and is used to generate a driving force for driving the push sub-drill pipe (12) to move towards the distal end of the drill barrel (11).

2. The composite drilling drive joint according to claim 1, wherein The push sub-drill pipe (12) includes a piston head (121), and the piston head (121) is in close fit with the reduced-diameter barrel section of the drill barrel (11). The drill barrel (11) has an enlarged-diameter barrel section (1121), the inner diameter of the enlarged-diameter barrel section (1121) is greater than that of the reduced-diameter barrel section, and the enlarged-diameter barrel section (1121) has an oil drain port (11211); It further includes a reset member (16). The first end of the reset member (16) is installed on the drill barrel (11), and the second end of the reset member (16) abuts against the rotary sub-drill pipe (13) to push the rotary sub-drill pipe (13) to reset when the piston head (121) moves into the enlarged-diameter barrel section (1121) and loses pressure.

3. The compound drilling drive joint according to claim 2, wherein, The sub-drill pipe connector (15) is of a cylindrical structure; The first end of the push sub-drill pipe (12) close to the rotary sub-drill pipe (13) is inserted into the interior of the first end of the sub-drill pipe connector (15), and the first end of the push sub-drill pipe (12) is in spiral linear fit with the first end of the sub-drill pipe connector (15); The first end of the rotary sub-drill pipe (13) close to the push sub-drill pipe (12) is inserted into the interior of the second end of the sub-drill pipe connector (15), and the first end of the rotary sub-drill pipe (13) is in one-way ratchet fit with the second end of the sub-drill pipe connector (15).

4. The composite drilling drive joint according to claim 3, wherein A one-way bearing (17) is sleeved inside the drill barrel (11), and the rotary sub-drill pipe (13) is inserted into the inner hole of the one-way bearing (17) to restrict the rotary sub-drill pipe (13) from rotating towards the preset direction.

5. The composite drilling drive joint according to claim 4, wherein The push-rod sub-drill pipe (12) includes a piston rod (122), and the drill barrel (11) includes a first piston outer barrel (111). The piston rod (122) is slidably inserted into the first piston outer barrel (111), and the first piston outer barrel (111) has a positioning groove to prevent the push-rod sub-drill from rotating.

6. The composite drilling drive joint according to claim 5, wherein, It further includes a thrust bearing (18), and the rotating sub-drill pipe (13) is inserted into the inner hole of the thrust bearing (18).

7. The composite drilling drive joint according to claim 6, wherein The push-rod sub-drill pipe (12) further includes a spiral mandrel (123). The piston head (121), the piston rod (122), and the spiral mandrel (123) are sequentially detachably and sealingly connected; the spiral mandrel (123) is in spiral linear fit with the first end of the sub-drill pipe connecting member (15). The rotating sub-drill pipe (13) includes a rotating mandrel (131), an upper bearing mandrel (132), and a lower bearing mandrel (133) that are sequentially detachably and sealingly connected. The rotating mandrel (131) is in one-way ratchet fit with the second end of the sub-drill pipe connecting member (15).

8. The composite drilling drive joint according to claim 7, wherein, The drill barrel (11) further includes a second piston outer barrel (112), a connecting outer barrel (113), an upper bearing outer barrel (114), and a lower bearing outer barrel (115). The second piston outer barrel (112), the first piston outer barrel (111), the connecting outer barrel (113), the upper bearing outer barrel (114), and the lower bearing outer barrel (115) are sequentially detachably and sealingly connected. The second piston outer barrel (112) has the reduced-diameter barrel section and the enlarged-diameter barrel section (1121). The reset member (16) is a spring, and the reset member (16) is telescopically sleeved inside the second piston outer barrel (112). The piston rod (122) is inserted into the inside of the reset member (16) and can move along the length direction of the drill barrel (11). The sub-drill pipe connecting member (15) is rotatably and slidably sleeved inside the connecting outer barrel (113) along the length direction of the drill barrel (11). The one-way bearing (17) is sleeved inside the upper bearing outer barrel (114), and a plurality of the one-way bearings (17) are evenly arranged along the axial direction of the upper bearing outer barrel (114). The thrust bearing (18) is sleeved inside the lower bearing outer barrel (115), and a plurality of the thrust bearings (18) are evenly arranged along the axial direction of the lower bearing outer barrel (115).

9. The compound drilling drive joint according to claim 8, characterized in that, The rotating sub-drill pipe (13) further includes a lower joint (134) and a throttle nozzle. The first end of the lower joint (134) is threadedly connected to the lower bearing mandrel (133), the second end of the lower joint (134) protrudes and abuts against the lower bearing outer barrel (115), and the throttle (14) is inserted into the second end of the lower joint (134).

10. A coiled tubing drilling composite drill string, comprising a coiled tubing, a connector, a downhole safety valve, a downhole safety release, a positive displacement motor (2) and a bit (3), characterized in that, It further includes the compound drilling drive joint (1) according to any one of the above claims 1-9. The coiled tubing, the connector, the downhole safety valve, the downhole safety release, the compound drilling drive joint (1) and the positive displacement motor (2) are connected in sequence and conductively, and the drill bit (3) is connected to the output end of the positive displacement motor (2).

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