A coiled tubing downhole traction device

Abstract

The present invention relates to a continuous pipe downhole traction device, comprising an outer shell and an inner tube, wherein an upper connection port and a lower connection port are provided at the upper and lower ends of the outer shell; the upper end of the inner tube is connected to the upper connection port, and the lower end is connected to the lower connection port through a fluid power conversion mechanism, and auxiliary wheels are arranged around the upper and lower parts of the inner tube; a switch valve assembly is arranged inside the upper end of the inner tube, and a fluid pressure relief port is arranged on the side wall of the inner tube, and the switch valve assembly is used to open or block the tube cavity of the inner tube under fluid impact; a starting disk is arranged inside the lower end of the inner tube, and a connecting rod is hinged at the lower end of the inner tube, and a contact wheel is assembled at one end of the connecting rod away from the inner tube, and a notch is arranged on the side of the outer shell, and the starting disk is connected to the connecting rod through a linkage mechanism, and a rebound mechanism is arranged between the connecting rod and the inner tube, and the starting disk descends under fluid impact, thereby driving the connecting rod through the linkage mechanism to drive the contact wheel to pass through the corresponding notch; the fluid power conversion mechanism is in transmission connection with the contact wheel. Advantages: It can walk along the well wall under fluid impact, and has high safety.

Description

Technical Field

[0001] The invention relates to the technical field of underground coiled tubing operations, and in particular to an underground coiled tubing traction device. Background Art

[0002] When operating in a long horizontal section of coiled tubing, there are problems such as difficulty in drilling down and difficulty in drilling. In some cases, the coiled tubing may even be locked, making it difficult to move the coiled tubing forward. At present, various technologies are used to alleviate such problems in coiled tubing operations. In addition, the coiled tubing has the characteristics of light weight, low rigidity, large deflection, and small radial size. During the lowering operation, a large annular space gap will be formed between the coiled tubing and the casing, making it difficult to withstand the axial load and causing large deformation. It is very easy to buckle and even lock.

[0003] Downhole tractor is a new type of downhole motion device proposed as horizontal well technology is widely used in oil and gas development. It can meet the needs of various downhole operating instruments and other auxiliary operations in horizontal wells, thereby solving the problem that downhole operating instruments or equipment are difficult to be transported to the predetermined position in high-angle wells and horizontal wells by gravity. Patent CN109681137 A discloses a one-way hydraulic telescopic continuous pipe tractor. The above-mentioned support block is used to grasp the mechanism attached to the well wall, and the mechanism that grasps the well wall by force control slips has a serious problem: it is easy to get stuck when encountering casing collars or mud, sand and gravel during drilling operations. Patent CN 109973032 A discloses a single-inclined block spring sheet supported continuous pipe traction robot. The tool requires electric drive. For some operating tool strings that do not require electric drive, the operation process of equipping them with power and lowering cables into the well is too cumbersome, which takes a lot of time and increases the cost of a single operation.

[0004] With the in-depth development of oil or natural gas, there are more and more horizontal wells or high-angle wells, and many high-efficiency continuous pipe equipment have appeared one after another. Due to their own weight, the operating tool string and the continuous pipe are closely attached to the casing wall when entering and pulling out of the horizontal well or high-angle well. When dealing with this type of well condition, the downhole tools cannot be lowered to the predetermined position, and the continuous pipe is a flexible pipe, which brings great inconvenience to the subsequent production increase operation. Therefore, how to reduce the contact friction between the operating tool string and the well wall is extremely critical. Patent CN 205805418 U discloses a hydraulic vibration tool, which uses the rotation of the rotor to control the relative movement of the upper and lower connecting valves to change the size of the flow area, thereby causing the hydraulic vibration tool and the tool string connected to it to vibrate. Its disadvantages are that the filter screen blocks too much sediment, the replacement after damage, the replacement of the rotor after wear, and the control of the flow area. Patent CN 210509045 U discloses a hydraulic pulse oscillation tool, which has a novel structure but is complicated to process and assemble. Various factors such as the size and angle will affect the state of the fluid passing through the channel, ultimately resulting in the inability to generate pulses and vibration operations.

[0005] The inability of the coiled tubing to rotate is the biggest technical difficulty encountered in downhole operations of the coiled tubing. The large friction resistance leads to low mechanical drilling speed, weak penetration depth capability, and inability to penetrate to the designed target position. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a coiled tubing downhole traction device, which effectively overcomes the defects of the prior art.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] A coiled tubing downhole traction device comprises a vertical outer shell and a vertical inner tube, wherein the upper and lower ends of the outer shell are respectively provided with an upper connection port and a lower connection port;

[0009] The inner tube is assembled in the outer shell, with its upper end connected to the upper connection port, and its lower end connected to the lower connection port through a fluid power conversion mechanism. A plurality of auxiliary wheels are circumferentially spaced around the upper and lower parts of the inner tube, and the auxiliary wheels pass through the matching notches on the outer shell respectively.

[0010] A switch valve assembly is provided inside the upper end of the inner tube, and a fluid pressure relief port is provided on the side wall of the upper end of the inner tube. The switch valve assembly is used to open or block the lumen of the inner tube under fluid impact;

[0011] A starting disk is provided inside the lower end of the inner tube, and a plurality of connecting rods which can swing up and down relative to the lower end of the inner tube are hingedly connected by rotating shafts around the lower end of the inner tube. The connecting rod extends upward at one end away from the inner tube and is rotatably equipped with a contact wheel. The side edges of the outer shell are provided with corresponding slots for the contact wheel to pass through. The starting disk is connected to the connecting rod through a linkage mechanism, and a rebound mechanism is provided between the connecting rod and the inner tube. The starting disk is used to be dropped by the impact of the fluid after the switch valve assembly opens the tube cavity of the inner tube, so that the connecting rod is driven by the linkage mechanism to overcome the elastic force of the rebound mechanism and drive the contact wheel to pass through the corresponding slot; the fluid power conversion mechanism is transmission-connected to the contact wheel, and is used to convert the kinetic energy of the fluid into mechanical energy for driving the contact wheel to rotate when the fluid passes through it.

[0012] Based on the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the linkage mechanism comprises a piston assembly, a hydraulic rod, an annular guide frame and a connecting arm. The piston assembly has a piston chamber, which is mounted at the lower end of the inner tube, and is provided with a piston rod extending vertically upward. The upper end of the piston rod is connected to the lower end of the starting disk. The hydraulic rod is vertically mounted on the outer wall of the inner tube. The piston chamber is connected and communicated with the cavity of the hydraulic rod through a pipeline. The guide frame is sleeved on the outer side of the upper end of the inner tube, the hydraulic rod is connected to the lower end of the guide frame, and one end of the connecting arm is hinged to the guide frame. The other end is movably connected to the connecting rod. The starting disk moves downward under the impact of the fluid, and the oil pressure in the piston cavity is injected into the cavity of the hydraulic rod through the piston rod, thereby driving the rod portion of the hydraulic rod to contract and driving the guide frame to move downward, thereby driving the connecting rod to overcome the elastic force of the rebound mechanism through the connecting arm and swing downward, and making the contact wheel extend out of the shell through the slot, or when the starting disk is not impacted by the fluid, the rebound mechanism drives the connecting rod to swing back to its original position, thereby driving the contact wheel to contract into the shell through the slot.

[0014] Furthermore, the above-mentioned rebound mechanism is a spring.

[0015] Furthermore, the fluid power conversion mechanism includes a vertical roller, a flexible telescopic sleeve and a vertical mounting sleeve. The upper end of the roller is rotatably sealed with the lower end of the inner tube, and a swirl sheet extending spirally from top to bottom is provided inside the roller. A wavy annular groove is provided in the middle section of the outer wall of the roller. The mounting sleeve is arranged below the roller, and its lower end extends into and is sealed and nested in the lower connecting port. The telescopic sleeve is connected between the roller and the upper end of the mounting sleeve, and the telescopic sleeve is rotatably connected to the lower end of the roller. A transmission rod extending vertically upward is fixed on the side wall of the mounting sleeve. A fixed bracket is connected to the lower end of the tube, the transmission rod is slidably connected to the fixed bracket up and down, the upper end of the transmission rod is provided with a linkage block extending into the annular groove, the rotating shaft is rotatably equipped with an intermediate wheel corresponding to the contact wheel one by one, the contact wheel is transmission connected to the intermediate wheel through a belt, the fixed bracket is provided with a power wheel corresponding to the intermediate wheel one by one, the power wheel is located below the corresponding intermediate wheel, and the two are connected by a belt, the mounting sleeve is movably connected to the non-center position of the end face of the power wheel through a force transmission arm, and the auxiliary wheel located at the lower part of the inner tube is assembled at the lower end of the fixed bracket.

[0016] Furthermore, the outer shell and the inner tube are both cylinders and are coaxially distributed.

[0017] Furthermore, the fixing bracket is provided with a plurality of strip holes corresponding to the transmission rods one by one around the fixing bracket, the strip holes extend up and down, the transmission rods are located outside the fixing bracket, and the linkage blocks pass through the corresponding strip holes.

[0018] Furthermore, the above-mentioned switch valve assembly includes a tubular shell-shaped piston body and a fluid driving assembly, the bottom wall of the above-mentioned piston body is penetrated by a fluid opening, and its side wall is provided with an opening corresponding to the above-mentioned fluid pressure relief port, a vertically extending flow limiting column is fixed in the middle of the lower end of the inner tube, the upper end of the above-mentioned flow limiting column passes through the above-mentioned fluid opening, and a sealing disk for blocking the above-mentioned fluid opening is provided at the upper end of the above-mentioned flow limiting column, the above-mentioned fluid driving assembly is installed in the upper part of the inner tube and connected to the above-mentioned piston body, the above-mentioned fluid driving assembly is used to drive the above-mentioned piston body to move downward under the impact of the fluid to block the above-mentioned fluid pressure relief port, and separate the above-mentioned sealing disk from the above-mentioned fluid opening, or drive the above-mentioned piston body to move upward and return to the above-mentioned opening to connect with the above-mentioned fluid pressure relief port, and make the above-mentioned sealing disk block the above-mentioned fluid opening; the above-mentioned starting disk is provided with a hole in the middle part, and the above-mentioned flow limiting column passes through the hole of the above-mentioned starting disk.

[0019] Furthermore, the above-mentioned fluid drive component includes a sliding bracket, a triangular locking path and an elastic locking rod. The upper part of the inner tube is provided with a support frame, the above-mentioned sliding bracket can be vertically slidably assembled on the above-mentioned support frame, and the lower end of the sliding bracket is connected and fixed to the above-mentioned piston body. The above-mentioned locking path is vertically assembled on the upper end of the above-mentioned sliding bracket, and the lower end of the locking path is connected to the above-mentioned support frame through an elastic member. The above-mentioned locking rod is vertically arranged, and the lower end of the locking rod is connected and fixed to the above-mentioned support frame, and the upper end is provided with a locking hook adapted to the above-mentioned locking path, and the above-mentioned locking hook is hung on the above-mentioned locking path. The upper part of the above-mentioned locking path is the horizontal base of the triangle, and the above-mentioned horizontal The bottom edge is bent downward to form a concave gear area, and its two sides are waist edges. The above-mentioned sliding bracket is used to move downward under the impact of the fluid, and make the lock hook of the above-mentioned locking rod move upward along the waist edge on one side of the above-mentioned locking path to the gear area of ​​the horizontal bottom edge, and compress the above-mentioned elastic member in the process, or the above-mentioned sliding bracket is used to continue to move downward under the impact of the fluid with a greater pressure again, and make the lock hook of the above-mentioned locking rod disengage from the above-mentioned gear area, and continue to move downward along the waist edge on the other side of the above-mentioned locking path, and in the process the above-mentioned elastic member restores its deformation and pushes the above-mentioned sliding bracket back to drive the piston body to move upward and return to its position.

[0020] Furthermore, the auxiliary wheels are respectively mounted on the upper and lower parts of the inner tube through wheel frames, a cavity is provided in the auxiliary wheel, a ratchet coaxially arranged with the auxiliary wheel is mounted in the cavity, two ratchets are rotatably mounted in the cavity corresponding to the upper and lower positions of the middle area of ​​one side of the ratchet, the two ratchets are respectively connected to the upper and lower cavity walls of the cavity through elastic members, a driving block rotatably connected to the cavity through a pin is provided between the two ratchets, the driving block is in contact with the two ratchets, a hydraulic telescopic rod is mounted on the wheel frame, the pin passes through one end of the auxiliary wheel and is connected to a force transmission member, the telescopic rod of the hydraulic telescopic rod is movably connected to the force transmission member, a vertical hydraulic cavity is fixed to the lower end of the support frame, an annular hydraulic energy storage cavity is provided on the outer side of the inner tube, and the lower end of the hydraulic cavity is connected to the hydraulic accumulator through a pipeline Energy chamber, the above-mentioned hydraulic energy storage chamber is connected to the rodless chamber of the above-mentioned hydraulic telescopic rod through a pipeline, the lower end of the above-mentioned locking path is connected with a vertical push rod connecting rod, the above-mentioned hydraulic chamber is provided with a piston, the lower end of the above-mentioned push rod connecting rod extends from top to bottom into the above-mentioned hydraulic chamber and is connected with the piston in the above-mentioned hydraulic chamber, the above-mentioned hydraulic telescopic rod is used to drive the above-mentioned force transmission member to drive the above-mentioned pin shaft and the driving block to rotate after extension, and push the above-mentioned ratchet teeth at the bottom to swing downward, and the above-mentioned ratchet teeth at the top are swung downward to engage with the upper part of one side of the above-mentioned ratchet wheel under the elastic force of the above-mentioned elastic member connected thereto, or the above-mentioned hydraulic telescopic rod is used to drive the above-mentioned force transmission member to drive the above-mentioned pin shaft and the driving block to rotate in the opposite direction after contraction, and push the above-mentioned ratchet teeth at the top to swing upward, and the above-mentioned ratchet teeth at the bottom are swung upward to engage with the lower part of one side of the above-mentioned ratchet wheel under the elastic force of the above-mentioned elastic member connected thereto.

[0021] The beneficial effects of the present invention are: reasonable structural design, capable of walking along the well wall under fluid impact, and high safety in use. The entire device is attached to the pipe wall by opening the contact wheel, and the rolling friction of the roller replaces the sliding friction formed by the contact between the coiled pipe and the pipe wall when the coiled pipe is lowered, thereby increasing the lowering depth of the coiled pipe in large displacement wells and horizontal wells, and effectively increasing the drilling pressure that can be applied to the end of the coiled pipe, which has broad application prospects in the field of downhole operations in horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram showing the use status of the coiled tubing downhole traction device of the present invention;

[0023] Figure 2 It is a schematic diagram of the internal structure of the coiled tubing downhole traction device of the present invention after removing the outer shell;

[0024] Figure 3 It is a cross-sectional view of the internal structure of the coiled tubing downhole traction device of the present invention after the outer shell is removed;

[0025] Figure 4It is a structural schematic diagram of the linkage mechanism in the downhole traction device of the continuous tubing of the present invention;

[0026] Figure 5 It is a partial structural schematic diagram of the fluid power conversion mechanism in the coiled tubing downhole traction device of the present invention;

[0027] Figure 6 It is a schematic structural diagram of a roller in a downhole traction device for a continuous tubing according to the present invention;

[0028] Figure 7 It is a partial structural schematic diagram of the fluid power conversion mechanism in the coiled tubing downhole traction device of the present invention;

[0029] Figure 8 It is a schematic diagram of the assembly structure of the auxiliary wheel in the coiled tubing downhole traction device of the present invention;

[0030] Fig. 9 It is a schematic diagram of the internal structure of the auxiliary wheel in the downhole traction device of the continuous tubing of the present invention;

[0031] Fig.10 It is a cross-sectional view of the inner wall structure of the inner tube in the downhole continuous tube traction device of the present invention;

[0032] Fig.11 It is a schematic structural diagram of the coiled tubing downhole traction device of the present invention with part of the switch valve assembly inside the inner tube removed;

[0033] Fig.12 It is a structural schematic diagram of the switch valve assembly in the coiled tubing downhole traction device of the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Shell; 2. Inner tube; 4. Fluid power conversion mechanism; 5. Fluid drive assembly; 6. Contact wheel; 7. Intermediate wheel; 9. Power wheel; 11. Upper connection port; 12. Lower connection port; 21. Fluid pressure relief port; 22. Auxiliary wheel; 23. Piston body; 24. Limiting column; 25. Start disk; 26. Fixed bracket; 28. Connecting rod; 41. Roller; 42. Telescopic sleeve; 43. Mounting sleeve; 51. Sliding bracket; 52. Locking path; 53. Locking rod; 58. Rebound mechanism; 81. Piston assembly; 82, hydraulic rod; 83, guide frame; 84, connecting arm; 211, hydraulic chamber; 212, hydraulic energy storage chamber; 221, ratchet; 222, ratchet; 223, drive block; 224, hydraulic telescopic rod; 225, force transmission member; 231, fluid opening; 232, opening; 241, blocking disk; 411, swirl plate; 412, annular groove; 431, transmission rod; 432, linkage block; 521, force transmission arm; 522, gear zone; 523, push rod connecting rod; 524, elastic member. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] Example: Figure 1 , 2 As shown in Figures 3 and 4, the downhole continuous tubing traction device of this embodiment comprises a vertical outer shell 1 and a vertical inner tube 2, wherein the upper and lower ends of the outer shell 1 are respectively provided with an upper connection port 11 and a lower connection port 12; the inner tube 2 is assembled in the outer shell 1, wherein the upper end thereof is connected to the upper connection port 11, and the lower end thereof is connected to the lower connection port 12 via a fluid power conversion mechanism 4, and a plurality of auxiliary wheels 22 are respectively arranged around the upper and lower parts of the inner tube 2 at annular intervals, and the auxiliary wheels 22 respectively pass through the matching notches on the outer shell 1; a switch valve assembly is arranged inside the upper end of the inner tube 2, and a fluid pressure relief port 21 is arranged on the upper end side wall of the inner tube 2, and the switch valve assembly is used to open or block the lumen of the inner tube 2 under fluid impact; a start disk 25 is arranged inside the lower end of the inner tube 2, and the lower end of the inner tube 2 is surrounded by a fluid pressure relief port 21. The rotating shaft is hinged with multiple connecting rods 28 that can swing up and down relative to it. The connecting rod 28 extends upward at one end away from the inner tube 2 and is rotatably equipped with a contact wheel 6. The side of the outer shell 1 is provided with corresponding slots for the contact wheel 6 to pass through. The starting disk 25 is connected to the connecting rod 28 through a linkage mechanism. A rebound mechanism 58 is provided between the connecting rod 28 and the inner tube 2. The starting disk 25 is used to drop under the impact of the fluid after the switch valve assembly opens the tube cavity of the inner tube 2, so that the connecting rod 28 is driven by the linkage mechanism to overcome the elastic force of the rebound mechanism 58 and drive the contact wheel 6 to pass through the corresponding slot; the fluid power conversion mechanism 4 is transmission-connected to the contact wheel 6, and is used to convert the fluid kinetic energy into mechanical energy for driving the contact wheel 6 to rotate when the fluid passes through it.

[0038] The usage process is as follows:

[0039] Step 1: Before use, ensure that the contact wheel 6 of the device is in the retracted stage, the fluid pressure relief port 21 is in the open state, and the upper connection port 11 on the device is connected to the oil pipe;

[0040] Step 2: Place the device (indicated by M in the figure) into the well (indicated by a in the figure), and then inject water into the upper connection port 11 of the device. If the water flow rate is less than the pressure relief volume of the fluid pressure relief port 21, the device is in standby mode.

[0041] Step 3: If it is necessary to move forward, the water flow needs to be increased so that the water intake is greater than the pressure relief. At this time, the equipment should be in a high-pressure state. When the pressure is higher than the set valve threshold, the switch valve assembly opens the inner cavity of the inner tube 2 and closes the fluid pressure relief port 21. The fluid flows downward through the switch valve assembly inside the inner tube 2. The flowing water will first impact the start disk 25. The start disk 25 will move downward under pressure, thereby driving the connecting rod 28 to swing through the linkage mechanism, and driving the above-mentioned connecting rod 28 to overcome the elastic force of the above-mentioned rebound mechanism 58 to drive the above-mentioned contact wheel 6 to pass through the corresponding above-mentioned slot and contact the well wall. At the same time, during the downward flow of the fluid in the inner tube 2, it will act on the fluid power conversion mechanism 4. The fluid power conversion mechanism 4 converts the fluid power into mechanical energy to drive the above-mentioned contact wheel 6 to rotate, thereby driving the contact wheel 6 to rotate, and realizing the movement of the entire equipment downward along the well wall.

[0042] As a preferred embodiment, Figure 4 As shown, the linkage mechanism includes a piston assembly 81, a hydraulic rod 82, an annular guide frame 83 and a connecting arm 84. The piston assembly 81 has a piston chamber, which is installed at the lower end of the inner tube 2. A piston rod extending vertically upward is arranged in the piston chamber. The upper end of the piston rod is connected to the lower end of the starting disk 25. The hydraulic rod 82 is vertically assembled on the outer wall of the inner tube 2. The piston chamber is connected and communicated with the cavity of the hydraulic rod 82 through a pipeline (denoted by d in the figure). The guide frame 83 is sleeved on the outer side of the upper end of the inner tube 2. The hydraulic rod 82 is connected to the lower end of the guide frame 83. One end of the connecting arm 84 is connected to the guide frame 83. The guide frame 83 is hinged, and the other end is movably connected with the connecting rod 28. The starting disk 25 moves downward under the impact of the fluid, and the oil pressure in the piston cavity is injected into the cavity of the hydraulic rod 82 through the piston rod, thereby driving the rod part of the hydraulic rod 82 to contract and driving the guide frame 83 to move downward, thereby driving the connecting rod 28 to overcome the elastic force of the rebound mechanism 58 and swing downward through the connecting arm 84, and making the contact wheel 6 extend out of the housing 1 through the slot, or when the starting disk 25 is not impacted by the fluid, the rebound mechanism 58 drives the connecting rod 28 to swing back to its original position, thereby driving the contact wheel 6 to contract into the housing 1 through the slot.

[0043] In the above embodiment, when the fluid impacts the start disk 25, the start disk 25 moves downward and pushes the piston rod to shrink into the piston cavity. In this process, the piston rod pushes the piston to pressurize the oil pressure in the piston cavity into the cavity (rod cavity) of the above hydraulic rod 82, thereby driving the rod portion of the above hydraulic rod 82 to move downward and shrink, thereby driving the guide frame 83 to move downward, and then driving the connecting rod 28 to swing downward through the connecting arm 84, so that the contact wheel 6 extends from the gap of the outer shell 1 and contacts the well wall (the synchronous rebound mechanism 58 is deformed). When there is no fluid impacting the start disk 25, or the fluid impact gradually decreases, the rebound mechanism 58 restores the deformation and drives the contact wheel 6 to shrink from the gap of the outer shell 1 and tightly into the outer shell 1. The entire structure is realized through a mechanical structure, and the structural design is reasonable and ingenious.

[0044] In this embodiment, the rebound mechanism 58 is a spring. When the contact wheel 6 extends out of the notch of the housing 1, the spring is stretched and deformed.

[0045] As a preferred embodiment, Figure 5 , 6 As shown in Figures 7 and 8, the fluid power conversion mechanism 4 includes a vertical roller 41, a flexible telescopic sleeve 42 and a vertical mounting sleeve 43. The upper end of the roller 41 is rotatably sealed and connected to the lower end of the inner tube 2, and a swirl sheet 411 extending spirally from top to bottom is provided inside the roller 41. A wavy annular groove 412 is provided in the middle section of the outer wall of the roller 41. The mounting sleeve 43 is arranged below the roller 41, and its lower end extends into and is sealed and nested in the lower connecting port 12. The telescopic sleeve 42 is connected between the upper ends of the roller 41 and the mounting sleeve 43, and the telescopic sleeve 42 is rotatably connected to the lower end of the roller 41. A transmission rod 431 extending vertically upward is fixed on the side wall of the mounting sleeve 43. A fixed bracket 26 is connected to the lower end of the inner tube 2, and the transmission rod 431 is slidably connected to the fixed bracket 26 up and down. The upper end of the transmission rod 431 is provided with a linkage block 432 extending into the annular groove 412. The rotating shaft is rotatably equipped with an intermediate wheel 7 corresponding to the contact wheel 6 one by one. The contact wheel 6 is transmission-connected to the intermediate wheel 7 through a belt. The fixed bracket 26 is provided with a power wheel 9 corresponding to the intermediate wheel 7 one by one. The power wheel 9 is located below the corresponding intermediate wheel 7, and the two are connected by a belt. The mounting sleeve 43 is movably connected to the non-center position of the end face of the power wheel 9 through a force transmission arm 521. The auxiliary wheel 22 located at the lower part of the inner tube 2 is assembled at the lower end of the fixed bracket 26.

[0046] In the above embodiment, when the fluid flows downward through the inner tube 2 and enters the drum 41, the fluid acts on the swirl sheet 411, driving the drum 41 to rotate. During the rotation of the drum, the wavy annular groove 412 forces the linkage block 432 to move up and down along it. Since the linkage block 432 is connected to the transmission rod 431, and the transmission rod 431 does not rotate, the transmission rod 431 is driven to slide up and down relative to the fixed bracket 26. During the up and down sliding process of the transmission rod 431, the telescopic sleeve 42 is driven to telescope up and down, and the installation sleeve is driven to move upward and downward. The cylinder 43 reciprocates up and down, and the installation sleeve 43 drives the power wheel 9 to rotate through the force transmission arm 521 connected thereto during the up and down reciprocating movement (the power wheel 9 and the upper end of the force transmission arm 521 are eccentrically connected, so the force transmission arm 521 drives the power wheel 9 to rotate during the up and down movement). During the rotation of the power wheel 9, the intermediate wheel 7 is driven to rotate through the belt, and the intermediate wheel 7 then drives the contact wheel 6 to rotate through the belt, thereby realizing the movement of the contact wheel 6 along the well wall (rolling downward). The entire design uses the impact of the fluid to realize the movement of the entire equipment along the well wall.

[0047] In this embodiment, the outer shell 1 and the inner tube 2 are both cylinders and are coaxially distributed.

[0048] As a preferred embodiment, the fixed bracket 26 is surrounded by a plurality of strip holes corresponding to the transmission rod 431 , the strip holes extend up and down, the transmission rod 431 is located outside the fixed bracket 26 , and the linkage block 432 passes through the corresponding strip holes.

[0049] In the above implementation scheme, the fixed bracket 26 adopts a cylindrical bracket body with strip holes on all sides to correspond to the transmission rod 431 one by one, ensuring that the transmission rod 431 can be stably connected and matched with the fixed bracket 26 and achieve a good up and down sliding relationship.

[0050] As a preferred embodiment, Fig.10 , 11As shown in Figures 12 and 13, the switch valve assembly includes a tubular shell-shaped piston body 23 and a fluid drive assembly 5. The bottom wall of the piston body 23 is penetrated by a fluid opening 231, and its side wall is provided with an opening 232 corresponding to the fluid pressure relief port 21. A vertically extending flow limiting column 24 is fixed to the middle of the lower end of the inner tube 2. The upper end of the flow limiting column 24 passes through the fluid opening 231, and a blocking disk 241 for blocking the fluid opening 231 is provided at the upper end thereof. The fluid drive assembly 5 is installed at the upper portion of the inner tube 2. The fluid driving assembly 5 is used to drive the piston body 23 to move downward to cover the fluid pressure relief port 21 under the impact of the fluid, and separate the blocking disk 241 from the fluid opening 231, or drive the piston body 23 to move upward back to the opening 232 to communicate with the fluid pressure relief port 21, and make the blocking disk 241 block the fluid opening 231; a hole is provided in the middle of the starting disk 25, and the limiting column 24 passes through the hole of the starting disk 25.

[0051] In the above implementation scheme, in the initial state (that is, when the equipment has just been put into the well and the contact wheel 6 is still in a retracted state), at this time, the fluid pressure relief port 21 and the opening 232 on the piston body 23 are in a state of overlapping and interconnecting, and the sealing disk 241 is in a state of just covering the fluid opening 231 of the piston body 23. The fluid entering the upper part of the inner tube 2 is discharged through the opening 232 and the fluid pressure relief port 21. As the fluid flow rate increases, the water intake is greater than the pressure relief amount. At this time, the equipment should be in a high-pressure state. When the pressure is higher than the set valve threshold, the fluid drive component 5 will drive the above-mentioned piston body 23 to move downward under the impact of the fluid to block the above-mentioned fluid pressure relief port 21, and separate the above-mentioned sealing disk 241 from the above-mentioned fluid opening 231. After reaching the destination, it returns to normal. The fluid flow and pressure are sufficient. When the equipment needs to be retracted, the fluid flow (that is, the pressure) is increased. The greater fluid pressure impact will cause the fluid drive component 5 to drive the above-mentioned piston body 23 to move upward and return to its position, so that the sealing disk 241 re-seals the fluid opening 231. At the same time, during the upward movement of the piston body 23, the internal pressure of the piston cavity is depressurized. Under the deformation recovery of the rebound mechanism 58, the linkage mechanism runs in reverse to retract the contact wheel 6 into the outer shell 1. At the same time, the opening 232 is reconnected with the above-mentioned fluid pressure relief port 21, and the above-mentioned sealing disk 241 blocks the above-mentioned fluid opening 231. In the whole design, two large flow impacts can make the piston body 23 reciprocate up and down once, thereby realizing the extension and retraction operation of the contact wheel. The design is very clever.

[0052] As a preferred embodiment, the fluid drive component 5 includes a sliding bracket 51, a triangular locking path 52 and an elastic locking rod 53. A support frame is provided at the upper part of the inner tube 2. The sliding bracket 51 can be vertically slidably assembled on the support frame, and its lower end is connected and fixed to the piston body 23. The locking path 52 is vertically assembled on the upper end of the sliding bracket 51, and its lower end is connected to the support frame through an elastic member 524. The locking rod 53 is vertically arranged, and its lower end is connected and fixed to the support frame, and its upper end is provided with a locking hook adapted to the locking path 52. The locking hook is hung on the locking path 52. The upper part of the locking path 52 is the horizontal bottom side of the triangle, and the The horizontal bottom edge is bent downward to form a concave gear area 522, with waist edges on both sides. The above-mentioned sliding bracket 51 is used to move downward under the impact of the fluid, and make the locking hook of the above-mentioned locking rod 53 move upward along the waist edge on one side of the above-mentioned locking path 52 to the gear area 522 of the horizontal bottom edge, and compress the above-mentioned elastic member 524 in the process, or the above-mentioned sliding bracket 51 is used to continue to move downward under the impact of the fluid with greater pressure again, and make the locking hook of the above-mentioned locking rod 53 disengage from the above-mentioned gear area 522, and continue to move downward along the waist edge on the other side of the above-mentioned locking path 52, and in the process the above-mentioned elastic member 524 restores its deformation and pushes the above-mentioned sliding bracket 51 back to drive the piston body 23 to move upward and return to its original position.

[0053] In the above-mentioned embodiment, when the fluid impacts the sliding bracket 51, the fluid drives the sliding bracket 51 to move downward, thereby causing the locking path 52 to move downward relative to the locking rod 53 (and compressing the elastic member 524). In this process, the locking hook of the locking rod 53 moves upward along the waist edge of the locking path 52 to the upper horizontal bottom edge of the locking path 52, and enters the gear area 522 along the locking path 52. If the fluid pressure does not increase, the sliding bracket 51 maintains the current position, that is, the piston body 23 maintains the current position, and the fluid continues to flow through the inner tube 2, thereby driving the fluid power conversion mechanism 4 to operate, realizing the rolling movement of the contact wheel 6 along the well wall, providing the contact wheel 6 with rotational power. When the equipment needs to be recovered, the flow rate (pressure) of the fluid is increased, and the fluid impacts the sliding bracket 51 with a greater pressure, which will make The sliding bracket 51 moves downward, so that the locking hook of the locking rod 53 moves upward and exits the gear zone 522. Since the locking rod 53 is an elastic rod, under the action of its slight deformation force, the locking hook of the locking rod 53 will move to the other waist side track of the locking path 52, and the locking rod 53 and the locking path 52 will release the locked state from each other. Then, after the fluid pressure decreases, the elastic member 524 restores its deformation and drives the sliding bracket 51 to bounce back upward, thereby driving the piston body 23 to move upward and return to its position, thereby cutting off the inner cavity of the inner tube 2, and driving the contact wheel 6 to retract into the outer shell 1 through the linkage mechanism, so that the entire device can be pulled out. The entire design is very clever, and the locking path 52, the locking rod 53 and the elastic member 524 cooperate with each other to realize the up and down movement of the piston body 23 under the impact of water flow.

[0054] In this embodiment, the entire technology of the fluid driving component 5 refers to the structure of the SD card slot mechanism in the prior art, and will not be elaborated here.

[0055] As a preferred embodiment, Figure 8 and 9As shown, the auxiliary wheel 22 is respectively mounted on the upper and lower parts of the inner tube 2 through a wheel frame, and a cavity is provided in the auxiliary wheel 22. A ratchet 221 coaxially arranged with the auxiliary wheel 22 is mounted in the cavity. Two ratchet teeth 222 are rotatably mounted in the cavity at the upper and lower positions corresponding to the middle area of ​​one side of the ratchet 221. The two ratchet teeth 222 are respectively connected to the upper and lower walls of the cavity through elastic members, and a driving mechanism rotatably connected to the cavity through a pin is provided between the two ratchet teeth 222. Block 223, the driving block 223 is in contact with the two ratchet teeth 222, a hydraulic telescopic rod 224 is mounted on the wheel frame, the pin passes through one end of the auxiliary wheel 22, and is connected with a force transmission member 225, the telescopic rod of the hydraulic telescopic rod 224 is movably connected with the force transmission member 225, a vertical hydraulic chamber 211 is fixed at the lower end of the support frame, an annular hydraulic energy storage chamber 212 is arranged on the outer side of the inner tube 2, and the lower end of the hydraulic chamber 211 is connected to the hydraulic energy storage chamber 212 through a pipeline (indicated by c in the figure) 2, the hydraulic energy storage chamber 212 is connected to the rodless chamber of the hydraulic telescopic rod 224 through a pipeline (indicated by b in the figure), the lower end of the locking path 52 is connected to a vertical push rod connecting rod 523, a piston is provided in the hydraulic chamber 211, the lower end of the push rod connecting rod 523 extends from top to bottom into the hydraulic chamber 211, and is connected to the piston in the hydraulic chamber 211, the hydraulic telescopic rod 224 is used to drive the force transmission member 225 to drive the pin shaft and the driving block 223 to rotate after extension, and push a lower The ratchet teeth 222 swing downward, and the upper ratchet teeth 222 swing downward under the elastic force of the elastic member connected thereto to engage with an upper portion of one side of the ratchet wheel 221, or the hydraulic telescopic rod 224 is used to drive the force transmission member 225 to drive the pin shaft and the driving block 223 to rotate in the opposite direction after contraction, and push the upper ratchet teeth 222 to swing upward, and the lower ratchet teeth 222 swing upward under the elastic force of the elastic member connected thereto to engage with a lower portion of one side of the ratchet wheel 221.

[0056] In the above embodiment, when the sliding bracket 51 moves downward, the push rod connecting rod 523 is driven to move downward, so that the hydraulic oil in the hydraulic chamber 211 is injected into the hydraulic energy storage chamber 212, and distributed to the rodless chamber of each hydraulic telescopic rod 224 through the hydraulic energy storage chamber 212 and the pipeline, thereby pushing the piston rod of the hydraulic telescopic rod 224 to extend. After the piston rod of the hydraulic telescopic rod 224 extends, the force transmission member 225 is driven to drive the pin shaft and the driving block 223 to rotate, and push the lower one The ratchet teeth 222 swing downward, and the upper ratchet teeth 222 swing downward under the elastic force of the elastic member connected thereto to engage with the upper part of one side of the ratchet wheel 221, so that the ratchet wheel 221 will not rotate (the auxiliary wheel 22 can only roll downward along the well wall, and cannot roll upward). When the entire equipment needs to be recovered, the sliding bracket 51 moves upward, the hydraulic chamber 211 loses pressure, and the oil in the rodless chamber of the hydraulic telescopic rod 224 flows back to the hydraulic energy storage chamber 212. And redistribute into the hydraulic chamber 211, that is, the process of the piston rod of the hydraulic telescopic rod 224 retracting. During the retraction process of the piston rod of the hydraulic telescopic rod 224, the force transmission member 225 is driven to drive the pin shaft and the driving block 223 to rotate in the opposite direction, and push the upper ratchet 222 to swing upward, and the lower ratchet 222 is swung upward under the elastic force of the elastic member connected thereto to engage with the lower part of one side of the ratchet 221. At this time, the ratchet 221 is restricted by the engagement of the ratchet 222, and the auxiliary wheel 22 can only roll upward along the well wall, and cannot roll downward), thereby improving the safety of the entire device in the well, so that during the downward movement in the well, the auxiliary wheel 22 will not roll backward upward under the upward impact of the well fluid, and the friction with the well wall will inhibit the device from retreating upward, or when recovered, the auxiliary wheel 22 will not roll downward, thereby preventing the device from further falling under the action of gravity (the friction with the well wall will inhibit the device from falling downward), and the safety is greatly improved.

[0057] The whole device has the following beneficial effects:

[0058] 1) The device is a purely mechanical structure, driven by liquid, and has no electronic components, which avoids the risk of failure underground due to short circuit and burnout of components, and has extremely high safety and reliability.

[0059] 2) The device is a purely mechanical structure and can hover underground at any time to achieve precise positioning operations.

[0060] 3) The device is a purely mechanical structure that is easy to recycle and highly reusable.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coiled tubing downhole traction device, characterized in that: It comprises a vertical outer shell (1) and a vertical inner tube (2), wherein the upper and lower ends of the outer shell (1) are respectively provided with an upper connecting port (11) and a lower connecting port (12); The inner tube (2) is mounted in the outer shell (1), with its upper end connected to the upper connection port (11), and its lower end connected to the lower connection port (12) via a fluid power conversion mechanism (4); a plurality of auxiliary wheels (22) are mounted circumferentially at intervals around the upper and lower parts of the inner tube (2), and the auxiliary wheels (22) respectively pass through matching notches on the outer shell (1); A switch valve assembly is provided inside the upper end of the inner tube (2), and a fluid pressure relief port (21) is provided on the side wall of the upper end of the inner tube (2). The switch valve assembly is used to open or block the lumen of the inner tube (2) under fluid impact; A start disk (25) is provided inside the lower end of the inner tube (2). A plurality of connecting rods (28) are hingedly connected to the lower end of the inner tube (2) via a rotating shaft and can swing up and down relative to the inner tube (2). One end of the connecting rod (28) away from the inner tube (2) extends upward and is rotatably equipped with a contact wheel (6). Notches for the contact wheel (6) to pass through are provided on the side of the outer shell (1) in a one-to-one correspondence. The start disk (25) is connected to the connecting rod (28) via a linkage mechanism. A rebound mechanism (58) is provided between the connecting rod (28) and the inner tube (2). The start disk (25) is used to be impacted by the fluid and fall down after the switch valve assembly opens the tube cavity of the inner tube (2), thereby passing The linkage mechanism drives the connecting rod (28) to overcome the elastic force of the rebound mechanism (58) and drive the contact wheel (6) to pass through the corresponding slot; the fluid power conversion mechanism (4) is in driving connection with the contact wheel (6) and is used to convert the kinetic energy of the fluid into mechanical energy for driving the contact wheel (6) to rotate when the fluid passes through it; the fluid power conversion mechanism (4) comprises a vertical roller (41), a flexible telescopic sleeve (42) and a vertical mounting sleeve (43); the upper end of the roller (41) is rotatably sealed with the lower end of the inner tube (2), and a swirl sheet (411) extending spirally from top to bottom is provided inside the roller (41); the outer surface of the roller (41) is provided with a swirl sheet (411) extending spirally from top to bottom; A wavy annular groove (412) is provided in the middle section of the wall; the mounting sleeve (43) is arranged below the roller (41), and its lower end extends into and is sealed and nested in the lower connection port (12); the telescopic sleeve (42) is connected between the roller (41) and the upper end of the mounting sleeve (43), and the telescopic sleeve (42) is rotatably connected to the lower end of the roller (41); a transmission rod (431) extending vertically upward is fixed on the side wall of the mounting sleeve (43); a fixed bracket (26) is connected to the lower end of the inner tube (2); the transmission rod (431) is slidably connected to the fixed bracket (26) up and down; and a telescopic sleeve (42) is provided on the upper end of the transmission rod (431). A linkage block (432) is inserted into the annular groove (412); an intermediate wheel (7) corresponding to the contact wheel (6) is rotatably mounted on the rotating shaft; the contact wheel (6) is transmission-connected to the intermediate wheel (7) via a belt; a power wheel (9) corresponding to the intermediate wheel (7) is mounted on the fixed bracket (26); the power wheel (9) is located below the corresponding intermediate wheel (7), and the two are connected via a belt; the mounting sleeve (43) is movably connected to the non-central position of the end face of the power wheel (9) via a force transmission arm (521); and the auxiliary wheel (22) located at the lower part of the inner tube (2) is mounted on the lower end of the fixed bracket (26);The switch valve assembly comprises a tubular shell-shaped piston body (23) and a fluid drive assembly (5); a fluid opening (231) is provided through the bottom wall of the piston body (23); an opening (232) corresponding to the fluid pressure relief port (21) is provided on the side wall; a vertically extending flow limiting column (24) is fixed to the middle of the lower end of the inner tube (2); the upper end of the flow limiting column (24) passes through the fluid opening (231), and a sealing disk (241) for shielding the fluid opening (231) is provided at the upper end of the flow limiting column (24); the fluid drive assembly (5) is mounted on the upper part of the inner tube (2), and Connected to the piston body (23), the fluid drive assembly (5) is used to drive the piston body (23) to move downward to cover the fluid pressure relief port (21) under the impact of the fluid, and separate the blocking disk (241) from the fluid opening (231), or drive the piston body (23) to move upward to the opening (232) to communicate with the fluid pressure relief port (21), and make the blocking disk (241) block the fluid opening (231); a hole is provided in the middle of the start disk (25), and the flow limiting column (24) passes through the hole of the start disk (25). ; 2. A coiled tubing downhole traction device according to claim 1, characterized in that: The linkage mechanism comprises a piston assembly (81), a hydraulic rod (82), an annular guide frame (83) and a connecting arm (84); the piston assembly (81) has a piston chamber, the piston chamber is mounted at the lower end of the inner tube (2), a piston rod extending vertically upward is arranged in the piston chamber, the upper end of the piston rod is connected to the lower end of the starting disk (25), the hydraulic rod (82) is vertically mounted on the outer wall of the inner tube (2), the piston chamber is connected and communicated with the cavity of the hydraulic rod (82) through a pipeline, the guide frame (83) is sleeved on the outer side of the upper end of the inner tube (2), the hydraulic rod (82) is connected to the lower end of the guide frame (83), and one end of the connecting arm (84) is hinged to the guide frame (83). The other end is movably connected to the connecting rod (28), and the starting disk (25) moves downward under the impact of the fluid, and the oil in the piston chamber is hydraulically pressed into the cavity of the hydraulic rod (82) through the piston rod, thereby driving the rod portion of the hydraulic rod (82) to contract and driving the guide frame (83) to move downward, thereby driving the connecting rod (28) to overcome the elastic force of the rebound mechanism (58) through the connecting arm (84) and swing downward, and causing the contact wheel (6) to extend out of the housing (1) through the notch. When the starting disk (25) is not impacted by the fluid, the rebound mechanism (58) drives the connecting rod (28) to swing back to its original position, thereby driving the contact wheel (6) to contract through the notch and enter the interior of the housing (1).

3. A coiled tubing downhole traction device according to claim 1, characterized in that: The rebound mechanism (58) is a spring.

4. A coiled tubing downhole traction device according to claim 1, characterized in that: The outer shell (1) and the inner tube (2) are both cylinders and are coaxially distributed.

5. A coiled tubing downhole traction device according to claim 4, characterized in that: The fixed bracket (26) is provided with a plurality of strip holes corresponding to the transmission rods (431) on the periphery thereof, the strip holes extending up and down, the transmission rods (431) being located outside the fixed bracket (26), and the linkage blocks (432) passing through the corresponding strip holes.

6. A coiled tubing downhole traction device according to any one of claims 1 to 5, characterized in that: The fluid drive assembly (5) comprises a sliding bracket (51), a triangular locking path (52) and an elastic locking rod (53). A support frame is provided at the upper part of the inner tube (2). The sliding bracket (51) can be vertically slidably mounted on the support frame, and its lower end is connected and fixed to the piston body (23). The locking path (52) is vertically mounted on the upper end of the sliding bracket (51), and its lower end is connected to the support frame via an elastic member (524). The locking rod (53) is vertically arranged, and its lower end is connected and fixed to the support frame. A locking hook adapted to the locking path (52) is provided at its upper end, and the locking hook is hung on the locking path (52). The upper part of the locking path (52) is a horizontal bottom side of a triangle, and the horizontal bottom side is The sliding bracket (51) is used to move downward under the impact of the fluid, and to make the lock hook of the locking rod (53) move upward along the waist edge on one side of the locking path (52) to the gear zone (522) on the horizontal bottom edge, and compress the elastic member (524) in the process, or the sliding bracket (51) is used to continue to move downward under the impact of the fluid with a greater pressure again, and to make the lock hook of the locking rod (53) disengage from the gear zone (522), and continue to move downward along the waist edge on the other side of the locking path (52), and in the process the elastic member (524) recovers its deformation and pushes the sliding bracket (51) back to drive the piston body (23) to move upward and return to its original position.

7. A coiled tubing downhole traction device according to claim 6, characterized in that: The auxiliary wheel (22) is respectively mounted on the upper and lower parts of the inner tube (2) via a wheel frame. A cavity is provided in the auxiliary wheel (22). A ratchet (221) is mounted in the cavity coaxially with the auxiliary wheel (22). Two ratchet teeth (222) are rotatably mounted in the cavity at upper and lower positions corresponding to the middle area of ​​one side of the ratchet (221). The two ratchet teeth (222) are respectively connected to the upper and lower walls of the cavity via elastic members. A driving block (222) is provided between the two ratchet teeth (222) and is rotatably connected to the cavity via a pin. 223), the driving block (223) is in contact with the two ratchet teeth (222), a hydraulic telescopic rod (224) is mounted on the wheel frame, the pin shaft passes through one end of the auxiliary wheel (22) and is connected to a force transmission member (225), the telescopic rod of the hydraulic telescopic rod (224) is movably connected to the force transmission member (225), a vertical hydraulic chamber (211) is fixed at the lower end of the support frame, an annular hydraulic energy storage chamber (212) is arranged on the outer side of the inner tube (2), and the lower end of the hydraulic chamber (211) is connected to the hydraulic energy storage chamber (212) through a pipeline. 2), the hydraulic energy storage chamber (212) is connected to the rodless chamber of the hydraulic telescopic rod (224) through a pipeline, the lower end of the locking path (52) is connected to a vertical push rod connecting rod (523), a piston is provided in the hydraulic chamber (211), the lower end of the push rod connecting rod (523) extends from top to bottom into the hydraulic chamber (211) and is connected to the piston in the hydraulic chamber (211), the hydraulic telescopic rod (224) is used to drive the force transmission member (225) to drive the pin shaft and the driving block (223) to rotate after extension, and push a lower one The ratchet (222) swings downward, and the upper ratchet (222) swings downward under the elastic force of the elastic member connected thereto to engage with an upper portion of one side of the ratchet wheel (221), or the hydraulic telescopic rod (224) is used to drive the force transmission member (225) to drive the pin shaft and the driving block (223) to rotate in the opposite direction after contraction, and push the upper ratchet (222) to swing upward, and the lower ratchet (222) swings upward under the elastic force of the elastic member connected thereto to engage with a lower portion of one side of the ratchet wheel (221).

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