CN115788337A - Underground traction device for coiled tubing - Google Patents

Abstract

The invention relates to a coiled tubing underground traction device, which comprises a shell and an inner tube, wherein the upper end and the lower end of the shell are provided with an upper connecting port and a lower connecting port; the upper end of the inner pipe is connected with the upper connecting port, the lower end of the inner pipe is connected with the lower connecting port through a fluid power conversion mechanism, and auxiliary wheels are arranged on the periphery of the upper part and the lower part of the inner pipe; the inner side of the upper end of the inner pipe is provided with a switch valve component, the side wall of the inner pipe is provided with a fluid pressure relief opening, and the switch valve component is used for opening or blocking the pipe cavity of the inner pipe under the impact of fluid; a starting disc is arranged in the lower end of the inner pipe, a connecting rod is hinged to the lower end of the inner pipe, a contact wheel is assembled at one end, away from the inner pipe, of the connecting rod, a notch is formed in the side edge of the shell, the starting disc is connected with the connecting rod through a linkage mechanism, a rebound mechanism is arranged between the connecting rod and the inner pipe, the starting disc descends under the impact of fluid, and therefore the linkage mechanism drives the connecting rod to drive the contact wheel to penetrate out of the corresponding notch; the fluid power conversion mechanism is in transmission connection with the contact wheel. The advantages are that: can walk along the well wall under the impact of fluid, and has high safety.

Description

Underground traction device for coiled tubing

Technical Field

The invention relates to the technical field of underground coiled tubing operation, in particular to an underground traction device for coiled tubing.

Background

When the continuous pipe is operated in a long horizontal section, the problems of difficult drilling, difficult drilling and the like exist. In some cases, the coiled tubing may even become locked, making it difficult to advance the coiled tubing further. Various techniques are currently employed in coiled tubing operations to alleviate such problems. In addition, the continuous pipe has the characteristics of light weight, low rigidity, large deflection and small radial size, and a larger annular space is formed between the continuous pipe and the sleeve during the lowering operation, so that the continuous pipe is difficult to bear axial load and has larger deformation, the buckling behavior is easy to occur, and even the locking phenomenon can be generated.

The underground tractor is a novel underground moving device which is provided along with the common application of a horizontal well technology in oil and gas development. The device can meet the requirements of conveying various horizontal underground operation instruments and developing other auxiliary operations, thereby solving the problem that the underground operation instruments or equipment are difficult to convey to preset underground positions of highly deviated wells and horizontal wells by means of gravity. Patent CN 109681137A, which discloses a single-direction hydraulic telescopic coiled tubing tractor, the above-mentioned supporting block is used for catching the mechanism on the well wall, and the mechanism on the well wall by force control slips, all of which have a serious problem: when the casing coupling is encountered, or when the sediment and gravel are encountered in the drilling operation process, the casing coupling is easy to block. Patent CN 109973032A discloses a monoclinic piece spring leaf support formula coiled tubing traction robot, and this instrument needs electric drive, to some operation tool strings that need not electric drive, and it is too loaded down with trivial details to be equipped with the operation processes such as power alone, cable put down in the well for it, takes a large amount of time to increase single operating cost simultaneously.

Along with the deep development of petroleum or natural gas, horizontal wells or highly deviated wells are more and more, a plurality of high-efficiency continuous pipe devices appear in succession, due to the self-weight, operation tool strings and continuous pipes can move forwards along the wall of a casing in the process of entering and exiting the horizontal wells or the highly deviated wells, and when the well condition is treated, the well tool cannot fall to a preset position, and the continuous pipes are flexible pipes, so that great inconvenience is brought to the subsequent production increasing operation. It is therefore critical how to reduce contact friction between the work tool string and the borehole wall. Patent CN 205805418U discloses a hydraulic vibration tool, which utilizes the rotation of a rotor to control the relative movement of an upper connecting valve and a lower connecting valve so as to change the size of the flow area, and further causes the hydraulic vibration tool and a tool string connected with the hydraulic vibration tool to vibrate. Patent CN 210509045U discloses a hydraulic pulse type oscillation tool, which is novel in structure, but complex in machining and assembly, wherein various factors such as a size angle and the like influence the state of a fluid passing through a channel, and finally the hydraulic pulse type oscillation tool cannot generate pulse and vibration operation.

The continuous pipe cannot rotate is the biggest technical problem encountered in underground operation of the continuous pipe, and the large friction resistance causes low mechanical drilling speed, weak deep-lowering capability, incapability of descending to a designed target position and the like.

Disclosure of Invention

The invention aims to solve the technical problem of providing a coiled tubing underground traction device, which effectively overcomes the defects of the prior art.

The technical scheme for solving the technical problems is as follows:

a coiled tubing underground traction device comprises a vertical outer shell and a vertical inner tube, wherein the upper end and the lower end of the outer shell are respectively provided with an upper connecting port and a lower connecting port;

the inner pipe is assembled in the outer shell, the upper end of the inner pipe is connected with the upper connecting port, the lower end of the inner pipe is connected with the lower connecting port through a fluid power conversion mechanism, a plurality of auxiliary wheels are respectively assembled on the periphery of the upper part and the periphery of the lower part of the inner pipe at intervals in an annular mode, and the auxiliary wheels respectively penetrate through matched notches in the outer shell;

the inner tube is provided with a pressure relief opening, and the pressure relief opening is used for opening or blocking the tube cavity of the inner tube under the impact of fluid;

a starting disc is arranged in the lower end of the inner pipe, a plurality of connecting rods capable of swinging up and down relative to the inner pipe are hinged to the periphery of the lower end of the inner pipe through a rotating shaft, one ends, far away from the inner pipe, of the connecting rods extend upwards and are rotatably provided with contact wheels, notches for the contact wheels to penetrate through are correspondingly arranged on the side edges of the shell in a one-to-one mode, the starting disc is connected with the connecting rods through a linkage mechanism, a rebound mechanism is arranged between the connecting rods and the inner pipe, the starting disc is used for descending under the impact of fluid after the switch valve component opens the pipe cavity of the inner pipe, and therefore the connecting rods are driven through the linkage mechanism to overcome the elastic force of the rebound mechanism to drive the contact wheels to penetrate out of the corresponding notches; the fluid power conversion mechanism is in transmission connection with the contact wheel and is used for converting fluid kinetic energy into mechanical energy for driving the contact wheel to rotate when fluid passes through the fluid power conversion mechanism.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the linkage mechanism comprises a piston assembly, a hydraulic rod, an annular guide frame and a connecting arm, wherein the piston assembly is provided with a piston cavity, the piston cavity is arranged at the lower end inside the inner tube and is internally provided with a piston rod which vertically extends upwards, the upper end of the piston rod is connected with the lower end of the starting disc, the hydraulic rod is vertically assembled on the outer wall of the inner tube, the piston cavity is connected and communicated with the cavity of the hydraulic rod through a pipeline, the guide frame is sleeved outside the upper end of the inner tube, the hydraulic rod is connected with the lower end of the guide frame, one end of the connecting arm is hinged with the guide frame, the other end of the connecting arm is movably connected with the connecting rod, the starting disc moves downwards under the impact of fluid, oil in the piston cavity is pressed into the cavity of the hydraulic rod through the piston rod, so that the rod part of the hydraulic rod is driven to contract, the guide frame is driven to move downwards, the connecting rod is driven to overcome the elasticity of the rebounding mechanism to swing downwards through the driving the connecting arm, the connecting arm drives the swinging wheel to extend out of the shell through a notch, or when the starting disc is not impacted by the fluid connecting rod, the swinging wheel drives the swinging arm to return to enter the shell.

Further, the resilient mechanism is a spring.

The fluid power conversion mechanism comprises a vertical roller, a flexible telescopic sleeve and a vertical installation sleeve, wherein the upper end of the roller is connected with the lower end of the inner pipe in a rotating and sealing mode, a spiral flow sheet which extends spirally from top to bottom is arranged in the roller, a wavy annular groove is formed in the middle section of the outer wall of the roller, the installation sleeve is arranged below the roller, the lower end of the installation sleeve extends into and is embedded in the lower connecting port in a sealing mode, the telescopic sleeve is connected between the roller and the upper end of the installation sleeve and is connected with the lower end of the roller in a rotating mode, a transmission rod which extends vertically and upwards is fixed on the side wall of the installation sleeve, a fixed support is connected to the lower end of the inner pipe, the transmission rod is connected with the fixed support in a vertically sliding mode, a linkage block which extends into the annular groove is arranged at the upper end of the transmission rod, intermediate wheels which correspond to the contact wheels in one to one are rotatably assembled on the rotating shaft, the contact wheels are connected with the intermediate wheels in a transmission mode through a belt, power wheels which correspond to one of the intermediate wheels are arranged on the fixed support, and the lower end of the power wheels which are connected to the movable through a position of the auxiliary support, and the lower end of the inner pipe.

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

Furthermore, a plurality of strip-shaped holes which are in one-to-one correspondence with the transmission rods are formed in the periphery of the fixing support, the strip-shaped holes extend up and down, the transmission rods are located on the outer side of the fixing support, and the linkage blocks penetrate through the corresponding strip-shaped holes.

Further, the switch valve assembly comprises a tubular piston body and a fluid driving assembly, wherein a fluid opening is formed in the bottom wall of the piston body in a penetrating manner, an opening corresponding to the fluid pressure relief opening is formed in the side wall of the piston body, a vertically extending flow limiting column is fixed in the middle of the lower end of the inner tube, the upper end of the flow limiting column penetrates through the fluid opening, a blocking disc for blocking the fluid opening is arranged at the end part of the upper end of the flow limiting column, the fluid driving assembly is installed at the upper part of the inner tube and connected with the piston body, and the fluid driving assembly is used for driving the piston body to move downwards to block the fluid pressure relief opening under the impact of fluid, separating the blocking disc from the fluid opening, or driving the piston body to move upwards to return to the opening to be communicated with the fluid pressure relief opening, and blocking the fluid opening by the blocking disc; the middle part of the starting disc is provided with a hole, and the flow limiting column penetrates through the hole of the starting disc.

Further, the fluid driving assembly includes a sliding bracket, a triangular locking path and an elastic locking rod, wherein a supporting frame is disposed at an upper portion inside the inner tube, the sliding bracket is vertically slidably mounted on the supporting frame, a lower end of the sliding bracket is fixedly connected to the piston body, the locking path is vertically mounted at an upper end of the sliding bracket, a lower end of the locking path is connected to the supporting frame through an elastic member, the locking rod is vertically disposed, a lower end of the locking rod is fixedly connected to the supporting frame, an upper end of the locking rod is provided with a locking hook adapted to the locking path, the locking hook is connected to the locking path, an upper portion of the locking path is a horizontal bottom edge of the triangular shape, the horizontal bottom edge is bent downward to form a concave shift area, two sides of the shift area are waist edges, the sliding bracket is configured to move downward under the impact of the fluid, and the locking hook of the locking rod moves upward to the shift area of the horizontal bottom edge along the waist edge of the locking path, and compresses the elastic member in the process, or the sliding bracket is configured to continue to move downward under the impact of the fluid under the impact of the greater pressure, and the elastic force of the locking rod returns to the elastic member, and pushes the elastic bracket upward and returns to the other side of the sliding bracket.

Further, the auxiliary wheel is respectively assembled on the periphery of the upper part and the lower part of the inner pipe through a wheel carrier, a cavity is arranged in the auxiliary wheel, a ratchet wheel which is coaxially arranged with the auxiliary wheel is assembled in the cavity, two ratchets are respectively arranged in the cavity corresponding to the upper part and the lower part of the middle area on one side of the ratchet wheel in a swinging way, the two ratchets are respectively connected with the upper cavity wall and the lower cavity wall of the cavity through elastic parts, a driving block which is rotationally connected with the cavity through a pin shaft is arranged between the two ratchets, the driving block is contacted with the two ratchets, a hydraulic telescopic rod is assembled on the wheel carrier, the pin shaft penetrates through one end of the auxiliary wheel and is connected with a force transmission part, the telescopic rod of the hydraulic telescopic rod is movably connected with the force transmission part, a vertical hydraulic cavity is fixed at the lower end of the support frame, and an annular hydraulic energy storage cavity is arranged outside the inner pipe, the lower end of the hydraulic cavity is connected with the hydraulic energy storage cavity through a pipeline, the hydraulic energy storage cavity is connected with a rodless cavity of the hydraulic telescopic rod through a pipeline, the lower end of the locking path is connected with a vertical push rod connecting rod, a piston is arranged in the hydraulic cavity, the lower end of the push rod connecting rod extends into the hydraulic cavity from top to bottom and is connected with the piston in the hydraulic cavity, the hydraulic telescopic rod is used for driving the force transmission piece to drive the pin shaft and the driving block to rotate after being extended, pushing one ratchet below the hydraulic rod to swing downwards, swinging the ratchet above the hydraulic telescopic rod downwards under the elastic force of the elastic piece connected with the hydraulic rod connecting rod to be meshed with the upper part of one side of the ratchet wheel, or the hydraulic telescopic rod is used for driving the force transmission piece to drive the pin shaft and the driving block to rotate reversely after being retracted and pushing one ratchet above the hydraulic rod to swing upwards, and the ratchet at the lower part swings upwards under the elastic force of the elastic piece connected with the ratchet to be meshed with the lower part of one side of the ratchet.

The invention has the beneficial effects that: structural design is reasonable, can walk along the wall of a well under the fluid impact, and the safety in utilization is higher. The whole device is attached to the pipe wall through the opening contact wheel, sliding friction formed by contact with the pipe wall when the continuous pipe is lowered is replaced by rolling friction of the roller, the lowering depth of the continuous pipe in a large-displacement well and a horizontal well is increased, the bit pressure which can be applied to the tail end of the continuous pipe is effectively increased, and the device has a wide application prospect in the underground operation field of the horizontal well.

Drawings

FIG. 1 is a state view of the coiled tubing downhole tractor apparatus of the present invention in use;

FIG. 2 is a schematic view of the internal structure of the coiled tubing downhole tractor of the present invention with the casing removed;

FIG. 3 is a cross-sectional view of the internal structure of the coiled tubing downhole tractor of the present invention with the outer casing removed;

FIG. 4 is a schematic structural view of a linkage mechanism in the coiled tubing downhole tractor apparatus of the present invention;

FIG. 5 is a schematic diagram of a portion of a fluid-dynamic conversion mechanism in a coiled tubing downhole tractor apparatus of the present invention;

FIG. 6 is a schematic diagram of the construction of the rollers in the coiled tubing downhole tractor of the present invention;

FIG. 7 is a schematic diagram of a portion of a fluid power conversion mechanism in a coiled tubing downhole tractor apparatus of the present invention;

FIG. 8 is a schematic view of the assembly of the auxiliary wheel in the coiled tubing downhole tractor of the present invention;

FIG. 9 is a schematic view of the internal structure of an auxiliary wheel in the coiled tubing downhole tractor of the present invention;

FIG. 10 is a cross-sectional view of the inner wall structure of the inner tube of the coiled tubing downhole tractor of the present invention;

FIG. 11 is a schematic view of the construction of the coiled tubing downhole tractor apparatus of the present invention with a portion of the switch valve assembly removed from the interior of the inner tube;

FIG. 12 is a schematic diagram of the construction of the switch valve assembly in the coiled tubing downhole tractor of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a housing; 2. an inner tube; 4. a fluid power conversion mechanism; 5. a fluid drive assembly; 6. a contact wheel; 7. an intermediate wheel; 9. a power wheel; 11. an upper connector; 12. a lower connector; 21. a fluid relief port; 22. an auxiliary wheel; 23. a piston body; 24. a flow-limiting column; 25. starting a disc; 26. fixing a bracket; 28. a connecting rod; 41. a drum; 42. a telescopic sleeve; 43. installing a sleeve; 51. a sliding support; 52. a lock-out path; 53. a lock lever; 58. a rebound mechanism; 81. a piston assembly; 82. a hydraulic lever; 83. a guide frame; 84. a connecting arm; 211. a hydraulic chamber; 212. a hydraulic energy storage cavity; 221. a ratchet wheel; 222. a ratchet; 223. a drive block; 224. a hydraulic telescopic rod; 225. a force transfer member; 231. a fluid opening; 232. opening a hole; 241. a plugging disc; 411. a spinning disk; 412. a ring groove; 431. a transmission rod; 432. a linkage block; 521. a force transmission arm; 522. a gear area; 523. a push rod connecting rod; 524. an elastic member.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

Example (b): as shown in fig. 1, 2 and 3, the coiled tubing downhole traction apparatus of the present embodiment comprises a vertical outer casing 1 and a vertical inner tube 2, wherein an upper connection port 11 and a lower connection port 12 are respectively arranged at the upper end and the lower end of the outer casing 1; the inner pipe 2 is assembled in the outer casing 1, the upper end of the inner pipe is connected with the upper connecting port 11, the lower end of the inner pipe is connected with the lower connecting port 12 through a fluid power conversion mechanism 4, a plurality of auxiliary wheels 22 are respectively assembled on the periphery of the upper part and the periphery of the lower part of the inner pipe 2 at intervals in the circumferential direction, and the auxiliary wheels 22 respectively penetrate through matched notches on the outer casing 1; a switch valve assembly is arranged in the upper end of the inner tube 2, a fluid pressure relief opening 21 is formed in the side wall of the upper end of the inner tube 2, and the switch valve assembly is used for opening or blocking the tube cavity of the inner tube 2 under the impact of fluid; a starting disc 25 is arranged in the lower end of the inner pipe 2, a plurality of connecting rods 28 which can swing up and down relative to the inner pipe 2 are hinged around the lower end of the inner pipe 2 through a rotating shaft, one end of each connecting rod 28, which is far away from the inner pipe 2, extends upwards and is rotatably provided with a contact wheel 6, notches for the contact wheels 6 to pass through are correspondingly arranged on the side edges of the shell 1 one by one, the starting disc 25 is connected with the connecting rods 28 through a linkage mechanism, a rebound mechanism 58 is arranged between the connecting rods 28 and the inner pipe 2, the starting disc 25 is used for falling under the impact of fluid after the switch valve assembly opens the pipe cavity of the inner pipe 2, and the connecting rods 28 are driven by the linkage mechanism to overcome the elastic force of the rebound mechanism 58 so as to drive the contact wheels 6 to pass through the corresponding notches; the fluid power conversion mechanism 4 is in transmission connection with the contact wheel 6 and is used for converting fluid kinetic energy into mechanical energy for driving the contact wheel 6 to rotate when fluid passes through the fluid power conversion mechanism.

The using process is as follows:

the first step is as follows: before use, the contact wheel 6 of the equipment is ensured to be in a retraction stage, the fluid pressure relief port 21 is in an open state, and the upper connecting port 11 on the equipment is connected with an oil pipe;

the second step: putting equipment (M in the figure) into a well (a in the figure), and injecting water flow into an upper connecting port 11 of the equipment, wherein if the water flow is smaller than the pressure relief amount of a fluid pressure relief port 21, the equipment is in a standby state;

the third step: if the equipment needs to move, water flow needs to be increased, so that the water inflow is larger than the pressure relief amount, the equipment is in a high-pressure state at the moment, when the pressure is higher than a set valve threshold value, the switch valve assembly opens the inner cavity of the inner pipe 2, the fluid pressure relief opening 21 is closed, fluid flows downwards through the switch valve assembly through the inner part of the inner pipe 2, the trickled water flow firstly impacts the starting disc 25, the starting disc 25 moves downwards under the pressure, the connecting rod 28 is driven to swing through the linkage mechanism, the connecting rod 28 is driven to overcome the elastic force of the rebound mechanism 58 to drive the contact wheel 6 to penetrate out of the corresponding notch to be in contact with the well wall, meanwhile, in the downward flowing process of the fluid in the inner pipe 2, the fluid acts on the fluid power conversion mechanism 4, the fluid power conversion mechanism 4 converts the fluid power into mechanical energy for driving the contact wheel 6 to rotate, and the contact wheel 6 is driven to rotate, so that the whole equipment moves downwards along the well wall.

As a preferred embodiment, as shown in fig. 4, 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 cavity mounted at the lower end inside the inner tube 2, a piston rod extending vertically upward is provided in the piston cavity, the upper end of the piston rod is connected to the lower end of the actuator disk 25, the hydraulic rod 82 is vertically assembled on the outer wall of the inner tube 2, the piston cavity is connected and communicated with the cavity of the hydraulic rod 82 through a pipeline (d in the figure), the guide frame 83 is sleeved outside the upper end of the inner tube 2, the hydraulic rod 82 is connected to the lower end of the guide frame 83, the connecting arm 84 has one end hinged to the guide frame 83 and the other end movably connected to the connecting rod 28, the actuator disk 25 moves downward under the impact of fluid, the piston rod presses the oil in the piston cavity into the cavity of the hydraulic rod 82, thereby driving the hydraulic rod 82 to contract and drive the connecting arm 83 to move downward, thereby driving the connecting rod 28 to overcome the elastic force of the connecting rod 84 to move the rocker arm 58 and drive the actuator disk 58 to move back to the actuator wheel 6 through the notch 1 or the inner housing 6.

In the above embodiment, when fluid impacts the start disc 25, the start disc 25 moves downward and pushes the piston rod to contract into the piston cavity, in the process, the piston rod pushes the piston to press the oil in the piston cavity into the cavity (rod cavity) of the hydraulic rod 82, thereby driving the rod of the hydraulic rod 82 to move downward and contract, thereby driving the guide frame 83 to move downward, further driving the connecting rod 28 to swing downward through the connecting arm 84, so that the contact wheel 6 extends out of the notch of the housing 1 and contacts with the well wall (the synchronous resilience mechanism 58 deforms), when no fluid impacts the start disc 25, or when the fluid impact is gradually reduced, the resilience mechanism 58 recovers the deformation, and drives the contact wheel 6 to shrink the housing 1 from the notch of the housing 1, the whole structure is realized through a mechanical structure, and the structural design is reasonable and ingenious.

In this embodiment, the resilient mechanism 58 is a spring, and the spring is stretched and deformed when the contact wheel 6 extends out of the notch of the housing 1.

As a preferred embodiment, as shown in fig. 5, 6 and 7, the fluid power conversion mechanism 4 includes a vertical drum 41, a flexible telescopic sleeve 42 and a vertical mounting sleeve 43, an upper end of the drum 41 is connected with a lower end of the inner tube 2 in a rotating and sealing manner, a spinning disk 411 extending in a spiral shape from top to bottom is provided in the upper end of the drum 41, a wavy annular groove 412 is provided in a middle section of an outer wall of the drum 41, the mounting sleeve 43 is provided below the drum 41, a lower end of the mounting sleeve 43 extends into and is hermetically nested in the lower connecting port 12, the telescopic sleeve 42 is connected between the drum 41 and an upper end of the mounting sleeve 43, the telescopic sleeve 42 is connected with the lower end of the drum 41 in a rotating manner, a vertically extending transmission rod 431 is fixed on a side wall of the mounting sleeve 43, a fixing bracket 26 is connected to a lower end of the inner tube 2, the transmission rod 431 is connected with the fixing bracket 26 in a vertically sliding manner, an 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 provided with intermediate wheels 7 corresponding to the contact wheels 6 one-to one another, the contact wheels 6 are connected with the intermediate wheels 7 through a belt, the transmission wheels 7 are connected with the fixing bracket 26 through a belt, the intermediate transmission wheel 7, the intermediate wheel 7, the movable transmission wheel 7 is connected with the intermediate wheel 7 through a central power wheel 9, the intermediate wheel 9, and a non-fixed wheel 9 is connected with the power wheel 9, and a non-fixed wheel 21 is connected with the intermediate wheel 26, the intermediate wheel 7, and a non-mounted end surface of the intermediate wheel 7, and a non-fixed wheel 7 is connected with the power wheel 26.

In the above embodiment, when fluid flows downwards through the inside of the inner tube 2 and enters the roller 41, the fluid acts on the rotational flow sheet 411 to drive the roller 41 to rotate, and in the rotating process of the roller, the corrugated ring groove 412 forces the linkage block 432 to move up and down along the linkage block 432, because the linkage block 432 is connected with 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, in the up and down sliding process of the transmission rod 431, the telescopic sleeve 42 is driven to stretch up and down and the mounting sleeve 43 is driven to reciprocate up and down, in the up and down reciprocating process of the mounting sleeve 43, the power wheel 9 is driven to rotate by the transmission arm 521 connected with the mounting sleeve 43 (the power wheel 9 is connected with the upper end of the transmission arm 521 eccentrically, so that the power wheel 9 is driven to rotate in the up and down moving process of the transmission arm 521), the power wheel 9 drives the intermediate wheel 7 to rotate by a belt, the contact wheel 6 to rotate along the well wall, and the moving (the downward rolling walking) of the whole equipment is realized by the impact of the fluid.

In this embodiment, the outer shell 1 and the inner tube 2 are both cylindrical and coaxially arranged.

In a preferred embodiment, a plurality of bar holes corresponding to the driving rods 431 are formed around the fixing bracket 26, the bar holes extend vertically, the driving rods 431 are located outside the fixing bracket 26, and the linkage blocks 432 pass through the corresponding bar holes.

In the above embodiment, the fixing bracket 26 is a cylindrical bracket body, and the periphery of the fixing bracket 26 is provided with strip-shaped holes to correspond to the transmission rods 431 one by one, so that the transmission rods 431 can be stably connected and matched with the fixing bracket 26, and a good up-and-down sliding relationship can be realized.

As a preferred embodiment, as shown in fig. 10, 11 and 12, the switching valve assembly includes a tubular piston body 23 and a fluid driving assembly 5, wherein a fluid opening 231 is formed through a bottom wall of the piston body 23, an opening 232 corresponding to the fluid relief opening 21 is formed in a side wall of the piston body, a vertically extending flow restricting column 24 is fixed in a middle portion of a lower end of an inside of the inner tube 2, an upper end of the flow restricting column 24 passes through the fluid opening 231, and an upper end portion of the flow restricting column is provided with a blocking disc 241 for blocking the fluid opening 231, the fluid driving assembly 5 is mounted on an upper portion of the inside of the inner tube 2 and connected to the piston body 23, and the fluid driving assembly 5 is configured to drive the piston body 23 to move down to block the fluid relief opening 21 and separate the blocking disc 241 from the fluid opening 21 or drive the piston body 23 to move up to return to communicate the opening 232 with the fluid relief opening 21 and block the fluid opening 231 by the blocking disc 241; the middle part of the starting disc 25 is provided with a hole, and the current limiting column 24 passes through the hole of the starting disc 25.

In the above embodiment, in the initial state (i.e. when the apparatus is just put into the well and the contact wheel 6 is still in the contracted state), at this time, the fluid pressure relief opening 21 and the opening 232 on the piston body 23 are in the overlapped and through state, and the blocking disc 241 is in the 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 opening 21, the water inlet amount is greater than the pressure relief amount as the fluid flow rate increases, at this time, the apparatus should be in the high pressure state, when the pressure is higher than the set valve threshold value, the fluid driving assembly 5 will drive the piston body 23 to move downwards to block the fluid pressure relief opening 21 under the impact of the fluid, and separate the blocking disc 241 from the fluid opening 231, and after traveling to the destination, the normal fluid flow rate and pressure are restored, when the apparatus needs to be retracted, the fluid flow rate (i.e. pressure) is increased, the fluid pressure impact of the fluid driving assembly 5 will drive the piston body 23 to move upwards to move the blocking disc 241, thereby re-blocking the fluid opening 231 again, and at the blocking disc 21 is retracted, and the piston 23 moves upwards, and the blocking mechanism returns the sealing disc 21 to the sealing disc 21, and the fluid opening 21 is retracted; in the whole design, the piston body 23 can reciprocate once up and down through two times of large-flow impact, so that the extending and retracting operations of the contact wheel are realized, and the design is very ingenious.

As a preferred embodiment, the fluid driving assembly 5 includes a sliding bracket 51, a triangular locking path 52 and a resilient locking rod 53, wherein a support is provided at an upper portion inside the inner tube 2, the sliding bracket 51 is vertically slidably mounted on the support, a lower end of the sliding bracket 51 is fixedly connected to the piston body 23, the locking path 52 is vertically mounted at an upper end of the sliding bracket 51, a lower end of the locking path is connected to the support through a resilient member 524, the locking rod 53 is vertically disposed, a lower end of the locking rod is fixedly connected to the support, an upper end of the locking rod is provided with a locking hook adapted to the locking path 52, the locking hook is hooked on the locking path 52, an upper portion of the locking path 52 is a horizontal base of the triangle, and the horizontal base is bent downward to form a recessed shift region 522, two sides of which are waist edges, the sliding bracket 51 is configured to move downward under the impact of fluid, and the locking hook of the locking rod 53 moves upward along the waist edge of one side of the locking path 52 to the shift region 522 of the horizontal base, and compresses the resilient member 524 in the process, or the sliding bracket 51 is configured to move downward under the greater impact pressure of the fluid, the impact force, the locking rod 524, so that the locking rod 52 moves upward and the locking rod 52 again, and the locking rod returns to move, and the locking rod 52, and the locking rod returns to move downward, and the locking rod 52, thereby the locking rod 51 returns to move downward, and the elastic member returns to the locking path, and the locking rod 52.

In the above embodiment, when the fluid impacts the sliding bracket 51, the fluid drives the sliding bracket 51 to move downward, so that the locking path 52 moves downward relative to the locking rod 53 (and compresses the elastic member 524), in this process, the latch 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 shift region 522 along the locking path 52, if the fluid pressure is not increased, the sliding bracket 51 maintains the current position, that is, the piston body 23 maintains the current position, the fluid continuously flows through the inner tube 2, so as to drive the fluid power conversion mechanism 4 to operate, so that the contact wheel 6 rolls along the well wall, and provides the rotation power for the contact wheel 6, when the device needs to be recovered, the flow (pressure) of the fluid is increased, the fluid impacts the sliding bracket 51 with a greater pressure, so that the sliding bracket 51 moves downward, so that the latch hook of the locking rod 53 moves relatively upward to exit the shift region 522, because the locking rod 53 is an elastic rod, under the action of a small deformation force, the latch hook of the locking rod 53 moves to move upward and the locking rod 524 to move out of the lock rod 52, so as to drive the sliding bracket 524, and the entire sliding bracket 52 to retract, so as to retract the inner tube 52, and the inner tube 23, thereby to retract the inner tube 23, and to retract the inner tube 52, and to retract the sliding mechanism, thereby to retract the inner tube 23, and to retract the inner tube 52.

In this embodiment, the whole technology of the fluid driving component 5 refers to the structure of the SD card slot mechanism in the prior art, and is not described herein again.

As a preferable embodiment, as shown in fig. 8 and 9, the auxiliary wheel 22 is respectively assembled around the upper part and the lower part of the inner tube 2 by a wheel frame, a cavity is arranged in the auxiliary wheel 22, a ratchet wheel 221 coaxially arranged with the auxiliary wheel 22 is assembled in the cavity, two ratchet teeth 222 are respectively arranged in the cavity corresponding to the upper part and the lower part of the middle area of one side of the ratchet wheel 221 in a swinging way, the two ratchet teeth 222 are respectively connected with the upper cavity wall and the lower cavity wall of the cavity by an elastic member, a driving block 223 rotatably connected with the cavity by a pin shaft is arranged between the two ratchet teeth 222, the driving block 223 is contacted with the two ratchet teeth 222, a hydraulic telescopic rod 224 is assembled on the wheel frame, the pin shaft 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 cavity 211 is fixed at the lower end of the support frame, an annular hydraulic energy storage cavity 212 is arranged outside the inner tube 2, the lower end of the hydraulic cavity 211 is connected with the hydraulic energy storage cavity 212 through a pipeline (denoted by c in the figure), the hydraulic energy storage cavity 212 is connected with a rodless cavity of the hydraulic telescopic rod 224 through a pipeline (denoted by b in the figure), the lower end of the locking path 52 is connected with a vertical push rod connecting rod 523, a piston is arranged in the hydraulic cavity 211, the lower end of the push rod connecting rod 523 extends into the hydraulic cavity 211 from top to bottom and is connected with the piston in the hydraulic cavity 211, the hydraulic telescopic rod 224 is used for driving the force transmission piece 225 to drive the pin shaft and the driving block 223 to rotate after being extended, and pushing one ratchet 222 below to swing downwards, and the ratchet 222 above swings downwards under the elastic force of the ratchet elastic piece connected with the ratchet elastic piece to the ratchet 221 to be meshed with the upper part of one side of the ratchet 221 Or the hydraulic telescopic rod 224 is used for driving the force transmission piece 225 to drive the pin shaft and the driving block 223 to rotate reversely after being contracted, pushing one ratchet 222 above to swing upwards, and swinging the ratchet 222 below to be engaged with the lower part of one side of the ratchet wheel 221 under the elastic force of the elastic piece connected with the ratchet 222.

In the above embodiment, during the downward movement of the sliding bracket 51, the push rod link 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 into the rodless chamber of each hydraulic telescopic rod 224 through the hydraulic energy storage chamber 212 and the pipeline, so as to push 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 and the driving block 223 to rotate, and push one ratchet 222 below to swing downward, and the ratchet 222 above swings downward under the elastic force of the elastic member connected with the ratchet 222 to engage with the upper part of one side of the ratchet 221, so that the ratchet 221 does not swing (the auxiliary wheel 22 can only roll downward along the well wall, and cannot roll upward), when the whole equipment needs to be recovered, the sliding bracket 51 moves upward, the hydraulic chamber 211 is pressed, so that the oil in the rodless chamber of the hydraulic telescopic rod 224 flows back into the hydraulic energy storage chamber 212, newly distributed into the hydraulic chamber 211, that the piston rod 224 retracts, and the hydraulic telescopic rod 224 is driven by the elastic force of the elastic member 222 below to roll upward, so that the ratchet 222 is not pushed upward under the elastic force of the hydraulic telescopic rod to roll downward and the lower ratchet 222, and the auxiliary wheel 222 is pushed upward, and the reverse swinging of the ratchet is not pushed to move upward under the elastic force of the hydraulic telescopic rod to move, so that the ratchet 222 in the hydraulic telescopic rod 22, and the reverse direction of the hydraulic telescopic rod can not roll downward, the equipment is restrained from moving back upwards under the action of friction force with the well wall, or when retrieving, auxiliary wheel 22 can not roll downwards, avoids equipment further to drop under the action of gravity (restrain equipment from dropping downwards under the action of friction force with the well wall), and the security promotes by a wide margin.

The whole equipment has the following beneficial effects:

1) The device is wholly of a pure mechanical structure, is driven by liquid, has no electronic components, avoids the risk of failure in the underground due to short circuit, burning and open circuit of the components, and has extremely high safety and reliability.

2) The device is a pure mechanical structure and can hover under the ground at any time, so that the precise positioning operation is realized.

3) The device is of a pure mechanical structure, is easy to recycle and has high reusability.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. The utility model provides a coiled tubing is draw gear in pit which characterized in that: the device comprises a vertical shell (1) and a vertical inner pipe (2), wherein the upper end and the lower end of the shell (1) are respectively provided with an upper connecting port (11) and a lower connecting port (12);

the inner pipe (2) is assembled in the shell (1), the upper end of the inner pipe is connected with the upper connecting port (11), the lower end of the inner pipe is connected with the lower connecting port (12) through a fluid power conversion mechanism (4), a plurality of auxiliary wheels (22) are respectively assembled on the periphery of the upper part and the periphery of the lower part of the inner pipe (2) in an annular interval manner, and the auxiliary wheels (22) respectively penetrate through gaps matched on the shell (1);

a switch valve component is arranged inside the upper end of the inner pipe (2), a fluid pressure relief opening (21) is formed in the side wall of the upper end of the inner pipe (2), and the switch valve component is used for opening or blocking a pipe cavity of the inner pipe (2) under fluid impact;

the inner pipe is characterized in that a starting disc (25) is arranged in the lower end of the inner pipe (2), a plurality of connecting rods (28) capable of swinging up and down relative to the inner pipe (2) are hinged to the periphery of the lower end of the inner pipe (2) through rotating shafts, one ends, far away from the inner pipe (2), of the connecting rods (28) extend upwards and are rotatably provided with contact wheels (6), notches for the contact wheels (6) to penetrate through are correspondingly formed in the side edges of the shell (1), the starting disc (25) is connected with the connecting rods (28) through a linkage mechanism, a rebound mechanism (58) is arranged between each connecting rod (28) and the inner pipe (2), the starting disc (25) is used for falling under the impact of fluid after the tube cavity of the inner pipe (2) is opened by the switch valve assembly, and therefore the connecting rods (28) are driven by the linkage mechanism to overcome the elastic force of the rebound mechanism (58) to drive the contact wheels (6) to penetrate through the corresponding notches; the fluid power conversion mechanism (4) is in transmission connection with the contact wheel (6) and is used for converting fluid kinetic energy into mechanical energy for driving the contact wheel (6) to rotate when fluid passes through the fluid kinetic energy conversion mechanism.

2. A coiled tubing downhole tractor as claimed in claim 1, wherein: 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) is provided with a piston cavity, the piston cavity is arranged at the lower end inside the inner pipe (2), a piston rod extending vertically upwards is arranged in the piston cavity, the upper end of the piston rod is connected with the lower end of the starting disc (25), the hydraulic rod (82) is vertically assembled on the outer wall of the inner pipe (2), the piston cavity is connected and communicated with the cavity of the hydraulic rod (82) through a pipeline, the guide frame (83) is sleeved outside the upper end of the inner pipe (2), the hydraulic rod (82) is connected with the lower end of the guide frame (83), one end of the connecting arm (84) is hinged with the guide frame (83), the other end of the connecting arm is movably connected with the connecting rod (28), the starting disc (25) moves downwards under the impact of fluid, the oil in the piston cavity is pressed into the cavity of the hydraulic rod (82) through the piston rod, so as to drive the hydraulic rod (82) to retract, and drive the guide frame (83) to move downwards through the elastic force of the connecting arm (58) to drive the starting disc (6) to overcome the elastic force of the connecting arm to drive the swinging wheel (6) and to flow downwards and drive the starting disc (6) to flow out of the elastic rotating wheel, the rebounding mechanism (58) drives the connecting rod (28) to swing and return, and then the contact wheel (6) is driven to contract into the shell (1) through the notch.

3. A coiled tubing downhole tractor as claimed in claim 1, wherein: the rebound mechanism (58) is a spring.

4. A coiled tubing downhole tractor as claimed in claim 1, wherein: fluid power conversion mechanism (4) including vertical cylinder (41), flexible expansion sleeve (42) and vertical installation sleeve (43), cylinder (41) upper end with the lower extreme rotary seal of inner tube (2) is connected, and its inside top-down that is the whirl piece (411) of heliciform extension that is equipped with, the outer wall middle section of cylinder (41) is equipped with corrugated annular (412), installation sleeve (43) set up in cylinder (41) below, its lower extreme stretch into and sealed nestification is in connector (12) down, expansion sleeve (42) are connected cylinder (41) with between the upper end of installation sleeve (43), just expansion sleeve (42) with the lower extreme rotary connection of cylinder (41), be fixed with vertical upwards extending transfer line (431) on the lateral wall of installation sleeve (43), inner tube (2) lower extreme is connected with fixed bolster (26), transfer line (431) with sliding connection about fixed bolster (26), the upper end of transfer line (431) is equipped with and stretches into rotatable linkage block (412), last pivot (7) and intermediate contact wheel (7) be equipped with contact wheel (7) one-to one the intermediate contact wheel (7), intermediate contact wheel (7) are equipped with contact wheel (7) one-to one The power wheel (9) is positioned below the corresponding middle wheel (7) and is connected with the middle wheel through a belt, the mounting sleeve (43) is movably connected with the non-central position of the end surface of the power wheel (9) through a transmission arm (521), and the auxiliary wheel (22) positioned at the lower part of the inner tube (2) is assembled at the lower end of the fixed support (26).

5. A coiled tubing downhole tractor as claimed in claim 1, wherein: the outer shell (1) and the inner tube (2) are both cylinders and are coaxially distributed.

6. A coiled tubing downhole tractor as claimed in claim 4, wherein: the periphery of the fixing support (26) is provided with a plurality of strip-shaped holes in one-to-one correspondence with the transmission rods (431), the strip-shaped holes extend up and down, the transmission rods (431) are located on the outer side of the fixing support (26), and the linkage blocks (432) penetrate through the corresponding strip-shaped holes.

7. A coiled tubing downhole tractor according to any of claims 1 to 6, wherein: the switch valve component comprises a tube-shell-shaped piston body (23) and a fluid driving component (5), a fluid opening (231) is arranged at the bottom wall of the piston body (23) in a penetrating way, an opening (232) corresponding to the fluid pressure relief opening (21) is arranged on the side wall of the piston body, a vertically extending flow limiting column (24) is fixed in the middle of the lower end in the inner tube (2), the upper end of the flow limiting column (24) penetrates through the fluid opening (231), a blocking disc (241) used for blocking the fluid opening (231) is arranged at the end part of the upper end of the flow limiting column, the fluid driving component (5) is installed at the upper part in the inner tube (2) and is connected with the piston body (23), and the fluid driving component (5) is used for driving the piston body (23) to move downwards to block the fluid pressure relief opening (21) under the impact of fluid, separating the blocking disc (241) from the fluid opening (231), or driving the piston body (23) to move upwards to return to the opening (232) to be communicated with the fluid pressure relief opening (21), and enabling the blocking disc (241) to be blocked; the middle part of the starting disc (25) is provided with a hole, and the flow limiting column (24) penetrates through the hole of the starting disc (25).

8. A coiled tubing downhole tractor as claimed in claim 7, wherein: the fluid driving assembly (5) comprises a sliding support (51), a triangular locking path (52) and an elastic locking rod (53), a support frame is arranged at the upper part inside the inner pipe (2), the sliding support (51) is vertically assembled on the support frame in a sliding manner, the lower end of the sliding support is fixedly connected with the piston body (23), the locking path (52) is vertically assembled at the upper end of the sliding support (51), the lower end of the locking path is connected with the support frame through an elastic piece (524), the locking rod (53) is vertically arranged, the lower end of the locking rod is fixedly connected with the support frame, the upper end of the locking rod is provided with a locking hook matched with the locking path (52), and the locking hook is hung on the locking path (52), the upper part of the locking path (52) is a triangular horizontal base, the horizontal base is bent downwards to form a concave gear area (522), two sides of the gear area are waist edges, the sliding bracket (51) is used for moving downwards under the impact of fluid and enabling the locking hook of the locking rod (53) to move upwards into the gear area (522) of the horizontal base along one waist edge of the locking path (52) and compressing the elastic piece (524) in the process, or the sliding bracket (51) is used for continuing to move downwards under the impact of the again higher pressure of the fluid and enabling the locking hook of the locking rod (53) to be separated from the gear area (522) and continuing to move downwards along the other waist edge of the locking path (52), and in the process, the elastic piece (524) restores to deform and pushes the sliding support (51) reversely to drive the piston body (23) to move upwards and return.

9. A coiled tubing downhole tractor as claimed in claim 8, wherein: the auxiliary wheel (22) is respectively assembled on the periphery of the upper part and the lower part of the inner tube (2) through a wheel carrier, a cavity is arranged in the auxiliary wheel (22), a ratchet wheel (221) coaxially arranged with the auxiliary wheel (22) is assembled in the cavity, two ratchets (222) are respectively arranged in the cavity corresponding to the upper part and the lower part of the middle area of one side of the ratchet wheel (221) in a swinging mode, the two ratchets (222) are respectively connected with the upper cavity wall and the lower cavity wall of the cavity through elastic parts, a driving block (223) rotatably connected with the cavity through a pin shaft is arranged between the two ratchets (222), the driving block (223) is in contact with the two ratchets (222), a hydraulic telescopic rod (224) is assembled on the wheel carrier, the pin shaft penetrates through one end of the auxiliary wheel (22) and is connected with a force transmission part (225), a telescopic rod of the hydraulic telescopic rod (224) is movably connected with the force transmission part (225), a vertical hydraulic cavity (211) is fixed at the lower end of the support frame, an annular hydraulic energy storage cavity (212) is arranged on the outer side of the inner tube (2), a hydraulic rod (211) is connected with a hydraulic rod (523) through a hydraulic rod without a hydraulic piston, and a hydraulic rod (211) is connected with a hydraulic rod (52) through a hydraulic rod (211), the lower end of the push rod connecting rod (523) extends into the hydraulic cavity (211) from top to bottom and is connected with a piston in the hydraulic cavity (211), the hydraulic telescopic rod (224) is used for driving the force transmission piece (225) to drive the pin shaft and the driving block (223) to rotate after being extended and pushing one ratchet (222) below to swing downwards, the ratchet (222) above swings downwards under the action of the elastic force of the elastic piece connected with the hydraulic telescopic rod (224) and is meshed with the upper part of one side of the ratchet wheel (221), or the hydraulic telescopic rod (224) is used for driving the force transmission piece (225) to drive the pin shaft and the driving block (223) to rotate reversely after being contracted and is used for pushing one ratchet (222) above to swing upwards, and the ratchet (222) below swings upwards under the action of the elastic piece connected with the hydraulic telescopic rod (224) and is meshed with the lower part of one side of the ratchet wheel (221).

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