CN112065312B - Hydraulic telescopic coiled tubing tractor for dense gas operation and use method - Google Patents
Hydraulic telescopic coiled tubing tractor for dense gas operation and use method Download PDFInfo
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- CN112065312B CN112065312B CN202011063224.9A CN202011063224A CN112065312B CN 112065312 B CN112065312 B CN 112065312B CN 202011063224 A CN202011063224 A CN 202011063224A CN 112065312 B CN112065312 B CN 112065312B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 79
- 238000007789 sealing Methods 0.000 claims description 34
- 230000006835 compression Effects 0.000 claims description 27
- 238000007906 compression Methods 0.000 claims description 27
- 230000009471 action Effects 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 12
- 238000013461 design Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
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Abstract
The invention provides a hydraulic telescopic coiled tubing tractor for dense gas operation and a use method thereof. According to the invention, the dovetail sliding block and the wedge-shaped dovetail sliding block are in sliding connection through the tooth-shaped sliding groove and the bulge, and the tooth-shaped groove structure can better provide the arm-grabbing force and provide large traction force; the invention avoids the phenomenon that the tractor is blocked when encountering a concave-convex soft spot in the pit; meanwhile, the capability of assisting the coiled tubing and related downhole tools to go out of the well after the operation is finished is met, and the bidirectional obstacle crossing function is achieved.
Description
Technical Field
The invention relates to a tractor for underground operation of a horizontal well section, belongs to the field of underground tools in the petroleum industry, and particularly relates to a hydraulic telescopic coiled tubing tractor for dense gas operation and a use method thereof.
Background
Petroleum and natural gas are important strategic resources, are widely distributed in China, have great development difficulty, and are novel and effective technology for compact oil and gas reservoirs by using horizontal wells. In the present stage, in order to reduce the exploitation cost and improve the recovery ratio of the oil and gas field, a horizontal drilling technology is mostly adopted, and the instrument is frequently required to be lowered into the well to perform the functions of logging, well repair, conveying downhole tools and the like. However, due to the special nature of horizontal wells, conventional gravity-fed suspended by a cable cannot deliver the downhole tool to the horizontal section. The feeding mode of the flexible oil pipe has no advantages in cost and efficiency, and the conveying difficulty is correspondingly increased due to the increase of the size of the horizontal section. It is therefore necessary to design a specific traction device by means of which the traction force provided by the traction tool is used to draw the tool forward, thus completing the relevant work requirements.
Through the recent more than ten years of development of horizontal well retractors, the structure is continuously improved, various forms of retractors are formed, and the horizontal well retractors can be divided into: wheel type tractor, telescopic tractor, crawler-type tractor. Although downhole tractor technology has tended to mature over decades, there are a number of problems and issues to be improved.
At present, the design of domestic tractors is still in the theoretical research and design experiment stage, and research results are immature. And the starting is earlier abroad, and a large number of products are put into actual production. In terms of traction force, the traction force of the underground tractor in the market at home and abroad is below 1000kg at present, and only a logging cable or a light instrument can be pulled. In the aspect of a driving mode, a telescopic tractor and a wheel tractor are more driven by a motor and driven by a screw nut, so that the design is simplified, but the structure of the tractor is complex, and the mechanical efficiency is reduced. Meanwhile, the domestic and foreign tractors have the defects of weak obstacle crossing capability and poor capability of adapting to the diameter change of the sleeve or the deformation of the sleeve.
Disclosure of Invention
The invention provides a hydraulic telescopic coiled tubing tractor for dense gas operation and a use method thereof, aiming at solving the problems of incapability of bidirectional passing, weak adaptability and poor obstacle crossing capability.
The invention adopts the technical scheme that:
the hydraulic telescopic coiled tubing tractor for dense gas operation at least comprises an outer sleeve, a coiled tubing, a joint assembly, a locking mechanism, an oil discharge port sliding sleeve, a central tube, telescopic reciprocating mechanisms and traction mechanisms, wherein the number of the locking mechanisms is two, the locking mechanisms comprises a left locking mechanism and a right locking mechanism, the central tube is positioned in the outer sleeve, the joint assembly, the left locking mechanism, the oil discharge port sliding sleeve, the telescopic reciprocating mechanisms, the right locking mechanism and the traction mechanisms are sequentially connected and sleeved on the central tube, the central tube comprises a left central tube and a right central tube, an oil inlet A is formed in the left central tube, and an oil inlet B is formed in the right central tube; the continuous oil pipe is communicated with the central pipe through the joint assembly; the outer sleeve comprises a left outer sleeve and a right outer sleeve, the left outer sleeve is provided with an oil discharge port A ', and the right outer sleeve is provided with an oil discharge port B'.
The joint assembly comprises a salvaging neck, a locking slip, a sealing joint and an inclined joint, wherein the salvaging neck is connected with the left end of the sealing joint through trapezoidal threads, and the right end of the sealing joint is connected with the inclined joint through trapezoidal threads; the external thread at the right end of the inclined joint is connected with the left outer sleeve, and the internal thread at the right end of the inclined joint is connected with the left central tube; the locking slips are embedded in the salvaging neck and sleeved on the coiled tubing, and the coiled tubing passes through the salvaging neck to be connected with the sealing joint.
The left locking mechanism and the right locking mechanism have the same structure, the left locking mechanism comprises a first compression spring, a left outer sleeve, a dovetail slide block check ring, a dovetail slide block and a wedge-shaped dovetail slide block, the right side of the wedge-shaped dovetail slide block is connected with the oil discharge port sliding sleeve, and the left side of the wedge-shaped dovetail slide block is connected with the dovetail slide block check ring; one end of the compression spring is fixed on the right end face of the inclined joint, and the other end of the compression spring props against the dovetail sliding block check ring; the dovetail sliding block is embedded on the wedge-shaped dovetail sliding block through a wedge-shaped groove at the bottom; the contact surface of the dovetail sliding block and the wedge-shaped dovetail sliding block is an inclined surface, and the left outer sleeve is provided with a hole matched with the dovetail sliding block; an oil discharge port A 'is arranged on the left outer sleeve, and the oil discharge port A' is positioned at the sliding sleeve of the oil discharge port; the oil inlet A is arranged on the central tube positioned on the right side of the oil discharge port sliding sleeve.
The telescopic reciprocating mechanism comprises an inner piston sliding sleeve I, a hollow piston positioning baffle ring, a hollow piston and a clamping ring, wherein the inner piston sliding sleeve I is sleeved on the central tube, and the left end of the inner piston sliding sleeve I is fixedly connected with the oil discharge port sliding sleeve; the hollow piston positioning baffle ring is fixed in a groove at the left end of the inner piston sliding sleeve, one end of the hollow piston is sleeved into the inner piston sliding sleeve I, the other end of the hollow piston is connected with the outer sleeve at the right side, and the hollow piston is telescopic; the clamping ring is fixed in a groove at the right end of the left central tube, and the inner piston is limited by the sliding sleeve.
The traction mechanism comprises an inner piston sliding sleeve II, a traction piston, a compression spring II, a traction sliding sleeve, a right central tube and a right outer sleeve; the second inner piston sliding sleeve is sleeved between the right central tube and the right outer sleeve, and the traction piston is sleeved between the second inner piston sliding sleeve and the traction sliding sleeve; the wedge-shaped dovetail sliding block 9 in the right locking mechanism is connected with the left end of the inner piston sliding sleeve, and the traction sliding sleeve is connected with the right end of the right central tube; the oil inlet B is arranged on the right central tube at the two positions of the inner piston sliding sleeve and is positioned at the left end of the traction piston; the oil outlet B' is arranged on the right outer sleeve at the traction sliding sleeve and is positioned at the lower part of the right outer sleeve; one end of the compression spring II is contacted with the bulge of the inner piston sliding sleeve II, and the other end of the compression spring II props against the traction sliding sleeve.
The traction sliding sleeve is of a hollow cylinder structure, an outer stepped hole is formed in the right end of the traction sliding sleeve, two inner stepped holes are formed in the left end of the traction sliding sleeve, and the step side face of the inner stepped hole on the left side is connected with the traction sliding sleeve in a sliding mode; the inner step hole on the right side is fixedly connected with the right end part of the right central tube; the diameter of the left inner stepped hole is larger than that of the outer stepped hole, and the diameter of the outer stepped hole is larger than that of the right inner stepped hole; the compression spring II is propped against the step surface of the left inner step hole.
The two right end parts of the inner piston sliding sleeve are provided with bulges, and the bulges limit the traction sliding sleeve.
The application method of the hydraulic telescopic coiled tubing tractor for dense gas operation comprises the following specific steps:
when the device works, the oil inlet A is filled with oil, the wedge-shaped dovetail slide block pushes the dovetail slide block to be contacted with a well wall and locked, meanwhile, the hollow piston stretches out to reach an elongation state, the inner piston sliding sleeve II is pushed to open the oil inlet B, and the clamping ring limits the stretching position of the hollow piston; the oil inlet A and the oil inlet B are used for simultaneously feeding oil, when the hollow piston stretches to the limit position, the oil discharge port A' is opened, and the wedge-shaped dovetail sliding block is retracted under the action of the compression spring; the oil inlet B is used for feeding oil to enable the right locking mechanism to be locked, and simultaneously pushing the traction piston to move right to reach the limit position and then pulling the right central tube to finish traction; after the traction reaches the limit position, the oil discharge port B' discharges oil, the right locking mechanism is retracted, and the hydraulic telescopic coiled tubing tractor returns to the initial state.
The invention has the beneficial effects that:
the outer surfaces of the dovetail sliding blocks in the left and right sets of locking mechanisms adopt tooth-shaped groove structures, and the tooth-shaped groove structures can better provide grab arm force so as to improve the friction force between the obstacle surmounting mechanism and the well wall and provide larger traction force; the device can be effectively adapted to the complex underground environment so as to achieve the obstacle crossing function, and the phenomenon that the tractor is blocked when encountering the concave-convex soft points in the underground is avoided; meanwhile, the capability of assisting the coiled tubing and related downhole tools to go out of the well after the operation is finished is met, and the bidirectional obstacle crossing function is achieved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic view of a locking mechanism.
FIG. 3 is a schematic view of a dovetail slider.
Fig. 4 is a schematic view of a telescoping mechanism.
Fig. 5 is a schematic drawing of a traction mechanism.
FIG. 6 is a schematic view of a wedge dovetail slider.
In the drawings, reference numerals are: 1. a coiled tubing; 2. fishing the neck; 3. locking slips; 4. sealing the joint; 5. an inclined joint; 6. compressing a first spring; 7. a left outer sleeve; 8. dovetail slide block retainer ring; 9. dovetail slide blocks; 10. wedge dovetail blocks; 11. a first sealing ring; 12. a left central tube; 13. an oil discharge port sliding sleeve; 14. an inner piston sliding sleeve I; 15. a hollow piston positioning baffle ring; 16. a second sealing ring; 17. a hollow piston; 18. a central tube; 19. a clasp; 20. a limiting block; 21. a right outer sleeve; 22. a right central tube; 23. an inner piston sliding sleeve II; 24. a third sealing ring; 25. a sealing ring IV; 26. compression spring II; 27. traction sliding sleeve; 28. and (5) pulling the piston.
Detailed Description
Example 1:
in order to solve the problems of incapability of bidirectional passing, weak adaptability and poor obstacle crossing capability in the prior art, the invention provides the hydraulic telescopic coiled tubing tractor for dense gas operation, which is shown in the figures 1-6, and the application method.
The utility model provides a compact gas operation is with flexible coiled tubing tractor of hydraulic pressure, includes outer sleeve, coiled tubing 1, joint Assembly, locking mechanism, oil discharge port sliding sleeve 13, center tube 18, flexible reciprocating mechanism and traction mechanism at least, locking mechanism be two, including left locking mechanism and right locking mechanism, center tube 18 be located the outer sleeve, joint Assembly, left locking mechanism, oil discharge port sliding sleeve 13, flexible reciprocating mechanism, right locking mechanism and traction mechanism connect gradually and cup joint on center tube 18, center tube 18 include left center tube 12 and right center tube 22, left center tube 12 on be equipped with oil inlet A, right center tube 22 on be equipped with oil inlet B; the continuous oil pipe 1 is communicated with the central pipe 18 through a joint assembly; the outer sleeve comprises a left outer sleeve 7 and a right outer sleeve 21, the left outer sleeve 7 is provided with an oil discharge port A ', and the right outer sleeve 21 is provided with an oil discharge port B'.
The working process of the invention is as follows:
when the telescopic reciprocating mechanism stretches to the limit position, the oil discharge port A' is opened, and the left locking mechanism is retracted; the right locking mechanism is locked after the oil inlet B is filled with oil, and meanwhile, the traction piston 28 in the traction mechanism is pushed to move right to reach the limit position, and the right central tube 22 is pulled to complete the traction action; after the traction reaches the limit position, the oil discharge port B' discharges oil, the right locking mechanism is retracted, and the hydraulic telescopic coiled tubing tractor returns to the initial state. In operation, the left outer sleeve 7 and the right outer sleeve 21 are separated to form a gap 20.
The invention can effectively adapt to complex underground environment to achieve the obstacle crossing function, and avoid the phenomenon that the tractor is blocked when encountering concave-convex soft points in the pit; meanwhile, the capability of assisting the coiled tubing and related downhole tools to go out of the well after the operation is finished is met, and the bidirectional obstacle crossing function is achieved. The invention can be used for shale gas or dense gas operation.
In the invention, the oil discharge port A ', the oil inlet A, the oil discharge port B' and the oil inlet B are all arranged in a circumferential direction. In the invention, four oil inlets A and four oil inlets B are selected. The oil inlet is not necessarily circular.
The invention avoids the phenomenon that the tractor is blocked when encountering an underground concave-convex soft spot, has good structural stability, is not easy to turn over, and obviously increases the safety of the underground operation process; the invention meets the capability of assisting the coiled tubing and related downhole tools to go out of the well after the operation is finished, has stronger bidirectional obstacle surmounting function, has good well wall adaptability, and is easy for the tubular column to reciprocate back and forth; meanwhile, the self-excitation type hydraulic control design is adopted for the tractor, and related actions are coordinated and controlled, so that the tractor has the characteristics of high mechanical efficiency and high crawling speed, and can realize quick pipe column running-in and running-out; in addition, the tractor has wide application range in underground operation, not only can be used in tubular column tripping operation, but also can be used in complicated operation working conditions such as sand washing, drilling and grinding and the like.
Example 2:
based on the embodiment 1, in this embodiment, preferably, the joint assembly includes a fishing neck 2, a locking slip 3, a sealing joint 4 and an inclined joint 5, where the fishing neck 2 is connected with the left end of the sealing joint 4 through trapezoidal threads, and the right end of the sealing joint 4 is connected with the inclined joint 5 through trapezoidal threads; the external thread at the right end of the inclined joint 5 is connected with the left outer sleeve 7, and the internal thread at the right end is connected with the left central tube 18; the locking slips 3 are embedded in the fishing neck 2 and sleeved on the coiled tubing 1, and the coiled tubing 1 passes through the fishing neck 2 to be connected with the sealing joint 4.
As shown in FIG. 1, the inclined joint 5 is funnel-shaped, the left end and the right end of the inclined joint 5 are provided with inner step holes, and the diameter of the inner step hole at the left end is smaller than that of the outer step hole at the right end. The right end of the inclined joint 5 is connected with a compression spring I6 in the left locking mechanism.
The sealing joint 4 is in a hollow cylinder shape, the left end and the right end of the sealing joint 4 are both provided with outer stepped holes, trapezoidal threads are arranged on the outer stepped holes, and the sealing joint 4 is respectively connected with the inclined joint 5 and the salvaging neck 2 through the outer trapezoidal threads at the two ends. The left end of the sealing joint 4 is also provided with an inner step hole, and a continuous oil pipe is connected in the inner step hole.
Preferably, the left locking mechanism and the right locking mechanism have the same structure, the left locking mechanism comprises a compression spring I6, a left outer sleeve 7, a dovetail slide block check ring 8, a dovetail slide block 9 and a wedge-shaped dovetail slide block 10, the right side of the wedge-shaped dovetail slide block 10 is connected with an oil discharge port sliding sleeve 13, and the left side is connected with the dovetail slide block check ring 8; one end of the compression spring I6 is fixed on the right end face of the inclined joint 5, and the other end of the compression spring I props against the dovetail sliding block check ring 8; the dovetail sliding block 9 is embedded on the wedge-shaped dovetail sliding block 10 through a wedge-shaped groove at the bottom; the contact surface of the dovetail sliding block 9 and the wedge-shaped dovetail sliding block 10 is an inclined surface, and the left outer sleeve 7 is provided with a hole matched with the dovetail sliding block 9; an oil discharge port A 'is arranged on the left outer sleeve 7, and the oil discharge port A' is positioned at the position of the oil discharge port sliding sleeve 13; the oil inlet A is arranged on a central pipe 18 positioned on the right side of the oil discharge port sliding sleeve 13.
As shown in fig. 2, the right side of the wedge-shaped dovetail sliding block 10 in the locking mechanism is connected with the oil discharge port sliding sleeve 13, the left side is connected with the dovetail sliding block check ring 8, the upper top point of the right end part of the dovetail sliding block check ring 8 is contacted with the vertical inclined surface of the dovetail sliding block 9, the dovetail sliding block 9 is ensured to only move up and down, and the dovetail sliding block cannot slide onto the inner wall of the left outer sleeve 7 in the locking state.
The oil discharge opening sliding sleeve 13 is of a hollow cylinder structure, and an inner step hole is formed in the right end of the oil discharge opening sliding sleeve 13.
As shown in fig. 3 and 6, in the invention, the dovetail slide block 9 and the wedge-shaped dovetail slide block 10 are connected in a sliding manner through a tooth-shaped slide groove and a bulge, and a wedge groove is formed at the bottom of the dovetail slide block 9 and can be embedded into a wedge block of the wedge-shaped dovetail slide block 10 and can slide along the wedge block. The outer surface of the dovetail sliding block 9 is provided with tooth-shaped grooves, and the tooth-shaped groove structure can better provide grabbing arm force so as to improve friction force between the dovetail sliding block 9 and a well wall and provide larger traction force.
In the invention, the left outer sleeve 7 is in dynamic sealing connection with the wedge-shaped dovetail sliding block 10, and is in sealing connection with the wedge-shaped dovetail sliding block by adopting two sealing rings, namely a sealing ring 11.
Preferably, the telescopic reciprocating mechanism comprises an inner piston sliding sleeve I14, a hollow piston positioning baffle ring 15, a hollow piston 17 and a clamping ring 19, wherein the inner piston sliding sleeve I14 is sleeved on a central tube 18, and the left end of the inner piston sliding sleeve I14 is fixedly connected with an oil discharge port sliding sleeve 13; the hollow piston positioning baffle ring 15 is fixed in a groove at the left end of the inner piston sliding sleeve I14, one end of the hollow piston 17 is sleeved into the inner piston sliding sleeve I14, the other end of the hollow piston 17 is connected with the right outer sleeve 21, and the hollow piston 17 can stretch out and draw back; the clamping ring 19 is fixed in a groove at the right end of the left central tube 12 and limits the first inner piston sliding sleeve 14.
As shown in fig. 4, the hollow piston 17 of the present invention has a hollow cylinder structure, and an inner stepped hole is formed at the right end, and the right end of the hollow piston 17 is connected with the compression spring 1 in the right locking mechanism. In the invention, the first inner piston sliding sleeve 14 is in sliding sealing connection with the hollow piston 17, and is in sealing connection by adopting the second sealing ring 16. One end of the hollow piston 17 is sleeved into the inner piston sliding sleeve 14, and the hollow piston positioning baffle ring 15 limits the inner piston sliding sleeve. The outer step hole is arranged outside the right end of the hollow piston 17, and the side surface of the outer step hole is in contact connection with the inner wall of the limiting block 20. The left outer sleeve 7 is connected with the right outer sleeve 21 through a limiting block 20, the outer wall of the limiting block 20 is flush with the outer walls of the left outer sleeve 7 and the right outer sleeve 21, and the inner diameter of the limiting block 20 is smaller than that of the left outer sleeve 7. The outer step Kong Bina of the right end of the hollow piston 17 has a step hole length.
The limiting block 20 is in a hollow cylinder shape, an outer stepped hole is formed in the left end of the limiting block, the outer stepped hole is connected with the left outer sleeve 7, and the right end face is connected with the left end face of the right outer sleeve 21.
Preferably, the traction mechanism comprises a second inner piston sliding sleeve 23, a traction piston 28, a second compression spring 26, a traction sliding sleeve 27, a right central tube 22 and a right outer sleeve 21; the second inner piston sliding sleeve 23 is sleeved between the right central tube 22 and the right outer sleeve 21, and the traction piston 28 is sleeved between the second inner piston sliding sleeve 23 and the traction sliding sleeve 27; the wedge-shaped dovetail sliding block 9 in the right locking mechanism is connected with the left end of the second inner piston sliding sleeve 23, and the traction sliding sleeve 27 is connected with the right end of the right central tube 22; the oil inlet B is arranged on the right central tube 22 at the second inner piston sliding sleeve 23 and is positioned at the left end of the traction piston 28; the oil outlet B' is arranged on the right outer sleeve 21 at the traction sliding sleeve 27 and is positioned at the lower part of the right outer sleeve 21; one end of the second compression spring 26 is contacted with the bulge of the second inner piston sliding sleeve 23, and the other end of the second compression spring is propped against the traction sliding sleeve 27.
In the invention, as shown in fig. 5, the traction sliding sleeve 27 is in sliding sealing connection with the traction piston 28, and is in sealing connection by adopting two sealing rings, three 24. The second inner piston sliding sleeve 23 is in sliding sealing connection with the traction piston 28, and is in sealing connection with the fourth sealing ring 25.
Preferably, the traction sliding sleeve 27 is of a hollow cylinder structure, the right end of the traction sliding sleeve is provided with an outer stepped hole, the left end of the traction sliding sleeve is provided with two inner stepped holes, and the step side surface of the left inner stepped hole is in sliding connection with the step side surface 28; the right inner stepped hole is fixedly connected with the right end part of the right central tube 22; the diameter of the left inner stepped hole is larger than that of the outer stepped hole, and the diameter of the outer stepped hole is larger than that of the right inner stepped hole; the compression spring II 26 is propped against the step surface of the left inner step hole.
Preferably, a protrusion is arranged at the right end of the second inner piston sliding sleeve 23, and the protrusion limits the traction sliding sleeve 27.
The locking mechanism comprises a left locking mechanism and a right locking mechanism, wherein the matching relation between the right locking mechanism and the left locking mechanism is the same. In the invention, the outer surfaces of the dovetail sliding blocks 9 in the left and right sets of locking mechanisms adopt tooth-shaped groove structures, and the tooth-shaped groove structures can better provide the arm force so as to improve the friction force between the obstacle surmounting mechanism and the well wall and provide larger traction force; the device can be effectively adapted to the complex underground environment so as to achieve the obstacle crossing function, and the phenomenon that the tractor is blocked when encountering the concave-convex soft points in the underground is avoided; meanwhile, the capability of assisting the coiled tubing and related downhole tools to go out of the well after the operation is finished is met, and the bidirectional obstacle crossing function is achieved.
The application method of the hydraulic telescopic coiled tubing tractor for dense gas operation comprises the following specific steps:
when the device works, an oil inlet A is filled with oil, the wedge-shaped dovetail slide block 10 pushes the dovetail slide block 9 to be contacted with a well wall and locked, meanwhile, the hollow piston 17 stretches out to reach an elongation state, the inner piston sliding sleeve II 23 is pushed to open the oil inlet B, and the clamping ring 19 limits the stretching position of the hollow piston 17; the oil inlet A and the oil inlet B are used for simultaneously feeding oil, when the hollow piston 17 stretches to the limit position, the oil discharge port A' is opened, and the wedge-shaped dovetail sliding block 10 is retracted under the action of the compression spring 6; the oil inlet B is used for locking the right locking mechanism, pushing the traction piston 28 to move right to reach the limit position and pulling the right central tube 22 to finish the traction action; after the traction reaches the limit position, the oil discharge port B' discharges oil, the right locking mechanism is retracted, and the hydraulic telescopic coiled tubing tractor returns to the initial state.
In the invention, all parts are machined, removed with burrs and sharp edges, and assembled after being cleaned; when assembling, each part should have no blocking; after the assembly is completed, each function is tested, the maximum peripheral diameter of the opened locking slips 3 is measured, and the stroke and the pressure are recorded. The left locking mechanism and the right locking mechanism can realize double locking condition, and the traction force is increased. The obstacle crossing capability can be improved by matching the left locking mechanism with the right locking mechanism.
The foregoing examples are merely illustrative of the present invention and are not to be construed as limiting the scope of the invention, and all designs which are the same or similar to the present invention are within the scope of the invention, and the device structures and method steps which are not described in detail in the present invention are prior art, and the present invention will not be further described.
Claims (6)
1. A compact gas operation is with flexible coiled tubing tractor of hydraulic pressure which characterized in that: the oil pump comprises an outer sleeve, a coiled tubing (1), a joint assembly, a locking mechanism, an oil discharge port sliding sleeve (13), a central tube (18), a telescopic reciprocating mechanism and a traction mechanism, wherein the number of the locking mechanisms is two, the oil pump comprises a left locking mechanism and a right locking mechanism, the central tube (18) is positioned in the outer sleeve, the joint assembly, the left locking mechanism, the oil discharge port sliding sleeve (13), the telescopic reciprocating mechanism, the right locking mechanism and the traction mechanism are sequentially connected and sleeved on the central tube (18), the central tube (18) comprises a left central tube (12) and a right central tube (22), an oil inlet A is formed in the left central tube (12), and an oil inlet B is formed in the right central tube (22); the continuous oil pipe (1) is communicated with the central pipe (18) through a joint assembly; the outer sleeve comprises a left outer sleeve (7) and a right outer sleeve (21), the left outer sleeve (7) is provided with an oil discharge port A ', and the right outer sleeve (21) is provided with an oil discharge port B'; the left locking mechanism and the right locking mechanism have the same structure, the left locking mechanism comprises a compression spring I (6), a left outer sleeve (7), a dovetail sliding block check ring (8), a dovetail sliding block (9) and a wedge-shaped dovetail sliding block (10), the right side of the wedge-shaped dovetail sliding block (10) is connected with an oil discharge port sliding sleeve (13), and the left side of the wedge-shaped dovetail sliding block is connected with the dovetail sliding block check ring (8); one end of the compression spring I (6) is fixed on the right end face of the inclined joint (5), and the other end of the compression spring I props against the dovetail sliding block check ring (8); the dovetail sliding block (9) is embedded on the wedge-shaped dovetail sliding block (10) through a wedge-shaped groove at the bottom; the contact surface of the dovetail sliding block (9) and the wedge-shaped dovetail sliding block (10) is an inclined surface, and the left outer sleeve (7) is provided with a hole matched with the dovetail sliding block (9); an oil discharge port A 'is arranged on the left outer sleeve (7), and the oil discharge port A' is positioned at the oil discharge port sliding sleeve (13); the oil inlet A is arranged on a central tube (18) positioned at the right side of the oil discharge port sliding sleeve (13); the telescopic reciprocating mechanism comprises an inner piston sliding sleeve I (14), a hollow piston positioning baffle ring (15), a hollow piston (17) and a clamping ring (19), wherein the inner piston sliding sleeve I (14) is sleeved on a central tube (18), and the left end of the inner piston sliding sleeve I (14) is fixedly connected with an oil discharge port sliding sleeve (13); the hollow piston positioning baffle ring (15) is fixed in a groove at the left end of the inner piston sliding sleeve I (14), one end of the hollow piston (17) is sleeved into the inner piston sliding sleeve I (14), the other end of the hollow piston (17) is connected with the right outer sleeve (21), and the hollow piston (17) is telescopic; the clamping ring (19) is fixed in a groove at the right end of the left central tube (12) and limits the first sliding sleeve (14) of the inner piston.
2. The hydraulic telescoping coiled tubing tractor for dense gas operation of claim 1, wherein: the connector assembly comprises a salvaging neck (2), a locking slip (3), a sealing connector (4) and an inclined connector (5), wherein the salvaging neck (2) is connected with the left end of the sealing connector (4) through trapezoidal threads, and the right end of the sealing connector (4) is connected with the inclined connector (5) through trapezoidal threads; the external thread at the right end of the inclined joint (5) is connected with the left outer sleeve (7), and the internal thread at the right end is connected with the left central tube (18); the locking slips (3) are embedded in the salvaging neck (2) and sleeved on the continuous oil pipe (1), and the continuous oil pipe (1) penetrates through the salvaging neck (2) to be connected with the sealing joint (4).
3. The hydraulic telescoping coiled tubing tractor for dense gas operation of claim 1, wherein: the traction mechanism comprises an inner piston sliding sleeve II (23), a traction piston (28), a compression spring II (26), a traction sliding sleeve (27), a right central tube (22) and a right outer sleeve (21); the second inner piston sliding sleeve (23) is sleeved between the right central tube (22) and the right outer sleeve (21), and the traction piston (28) is sleeved between the second inner piston sliding sleeve (23) and the traction sliding sleeve (27); the wedge-shaped dovetail sliding block (10) in the right locking mechanism is connected with the left end of the second inner piston sliding sleeve (23), and the traction sliding sleeve (27) is connected with the right end of the right central tube (22); the oil inlet B is arranged on a right central tube (22) at the second inner piston sliding sleeve (23) and is positioned at the left end of the traction piston (28); the oil discharge port B' is arranged on the right outer sleeve (21) at the traction sliding sleeve (27) and is positioned at the lower part of the right outer sleeve (21); one end of the compression spring II (26) is contacted with the bulge of the inner piston sliding sleeve II (23), and the other end of the compression spring II is propped against the traction sliding sleeve (27).
4. A hydraulic telescoping coiled tubing tractor for dense gas operation as defined in claim 3 wherein: the traction sliding sleeve (27) is of a hollow cylinder structure, the right end of the traction sliding sleeve is provided with an outer stepped hole, the left end of the traction sliding sleeve is provided with two inner stepped holes, and the step side surface of the left inner stepped hole is in sliding connection with the traction piston (28); the right inner step hole is fixedly connected with the right end part of the right central tube (22); the diameter of the left inner stepped hole is larger than that of the outer stepped hole, and the diameter of the outer stepped hole is larger than that of the right inner stepped hole; the compression spring II (26) is propped against the step surface of the left inner step hole.
5. A hydraulic telescoping coiled tubing tractor for dense gas operation as defined in claim 3 wherein: the right end part of the second inner piston sliding sleeve (23) is provided with a bulge, and the bulge limits the traction sliding sleeve (27).
6. The hydraulic telescopic continuous oil pipe tractor for dense gas operation according to any one of claims 1-5, which provides a use method of the hydraulic telescopic continuous oil pipe tractor for dense gas operation, characterized in that: the method comprises the following specific steps: when the device works, an oil inlet A is filled with oil, a wedge-shaped dovetail sliding block (10) pushes a dovetail sliding block (9) to be in contact with a well wall and locked, meanwhile, a hollow piston (17) stretches out to reach an elongation state, a second inner piston sliding sleeve (23) is pushed to open an oil inlet B, and a clamping ring (19) limits the stretching position of the hollow piston (17); the oil inlet A and the oil inlet B are used for simultaneously feeding oil, when the hollow piston (17) stretches to the limit position, the oil discharge port A' is opened, and the wedge-shaped dovetail sliding block (10) is retracted under the action of the first compression spring (6); the oil inlet B is used for enabling the right locking mechanism to be locked, and pushing the traction piston (28) to move right to reach the limit position and then pulling the right central tube (22) to finish traction; after the traction reaches the limit position, the oil discharge port B' discharges oil, the right locking mechanism is retracted, and the hydraulic telescopic coiled tubing tractor returns to the initial state.
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| CN113653453A (en) * | 2021-08-18 | 2021-11-16 | 中石化石油工程技术服务有限公司 | Downhole reducing environment self-adaptive adjusting device of tractor and control method thereof |
| CN113482556A (en) * | 2021-08-25 | 2021-10-08 | 成都理工大学 | Closed-loop well flushing method based on coiled tubing and telescopic robot |
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