CN114508316B - Underground expansion plugging mechanism - Google Patents
Underground expansion plugging mechanism Download PDFInfo
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- CN114508316B CN114508316B CN202011283049.4A CN202011283049A CN114508316B CN 114508316 B CN114508316 B CN 114508316B CN 202011283049 A CN202011283049 A CN 202011283049A CN 114508316 B CN114508316 B CN 114508316B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 230000002787 reinforcement Effects 0.000 description 10
- 238000010276 construction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides an underground expansion plugging mechanism, which comprises an outer expansion assembly and an inner expansion assembly arranged in the outer expansion assembly to provide expansion acting force, wherein the outer expansion assembly comprises an expandable coiled pipe body, a meshing part for preventing the coiled pipe body from backing after expanding, and a pipe body positioning piece for fixing the position of the coiled pipe body, wherein the overlapped parts of the coiled pipe body are meshed with each other through the meshing part, and the inner meshing angle of the meshing part is arranged towards the moving direction of the outer ring of the coiled pipe body; the pipe body positioning piece is arranged at the position of the engagement part and is sheared when the coiled pipe body expands. The invention has the advantages of high expansion coefficient, no rollback after expansion, adjustable expansion diameter and the like.
Description
Technical Field
The invention relates to the field of petroleum equipment, in particular to an underground expansion plugging mechanism.
Background
In the production process of oil and gas wells, the casing is often damaged or the casing is easy to collapse or leak when being drilled due to stratum or corrosive wear and other reasons, so that the casing cannot be safely drilled to the designed depth, and the underground safety is affected. Therefore, casing repair and sealing of the easy-collapse and easy-to-leak formations become an important remedy in the oilfield development process. The existing casing damage management mainly adopts the means of shaping, milling, reinforcing, sleeve taking and the like.
The sleeve reinforcement is an important sleeve damage treatment technology, but the sleeve reinforcement (such as corrugated pipe reinforcement and explosion welding reinforcement) has high requirements on the tightness of the pipe column. Specifically, the corrugated pipe is reinforced by bonding and sealing an epoxy glue and a sleeve, the corrugated pipe is low in fixing strength, easy to fall off, poor in high temperature resistance and not suitable for a steam injection thermal production well; the explosion welding reinforcement technology can only be used for well sections with large casing external constraint force, and is not suitable for repairing the well with shallow burial, loose stratum cementation and unevaluated well cementation quality.
In order to solve the problems existing in the prior art, the existing mode adopts an expansion pipe reinforcement technology, and can perform sleeve reinforcement work under various conditions. The invention patent CN2015110114612. X discloses an expansion pipe for petroleum drilling, which comprises a centralizer, wherein one end of a supporting rod is uniformly fixed on the relative position of the inner wall of the centralizer, the other end of the supporting rod is fixedly connected with the outer wall of the expansion pipe, diamond-shaped slits are uniformly arranged on the expansion pipe, the diamond-shaped slits are arrayed in a ring shape, the top end of the expansion pipe is of an opening structure, an expansion cone is clamped at the opening of the top end of the expansion pipe, and one end of a cone rod is fixed at the top end of the expansion cone. This oil bores adopts expansion pipe simple structure, and the expansion pipe passes through branch and centralizer cooperation and makes its position can obtain stably, guarantees to bore the normal clear of adopting work to evenly open on the expansion pipe has diamond slit, has greatly helped the expansion coefficient maximize of expansion pipe, makes the expansion pipe more be convenient for expand, and the original mechanical properties of expansion pipe can not change, guarantees the normal clear of expansion work, has improved the expansion coefficient of expansion pipe. However, the expansion coefficient of the existing mode is still limited, and the existing mode cannot adapt to the working condition with high requirement on the expansion coefficient.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the underground expansion plugging mechanism which has high expansion coefficient, does not fall back after expansion and has adjustable expansion diameter.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
The underground expansion plugging mechanism comprises an outer expansion assembly and an inner expansion assembly arranged in the outer expansion assembly to provide expansion acting force, wherein the outer expansion assembly comprises an expandable coiled pipe body, an engagement part for preventing the coiled pipe body from retreating after expanding, and a pipe body positioning piece for fixing the position of the coiled pipe body, overlapped parts of the coiled pipe body are engaged with each other through the engagement part, and an inner engagement angle of the engagement part is arranged towards the moving direction of an outer ring of the coiled pipe body; the pipe body positioning piece is arranged at the position of the engagement part and is sheared when the coiled pipe body expands.
As a further improvement of the above technical scheme:
The outer expansion assembly further comprises an outer expansion pipe for improving the anti-extrusion capacity of the coiled pipe body, the outer expansion pipe is provided with an expansion opening for providing an expansion space of the outer expansion pipe, and the outer expansion pipe is wrapped on the outer side of the coiled pipe body.
The expansion opening positions of the outer expansion pipes are overlapped with each other or an expansion gap is reserved between the expansion opening positions.
The expansion opening is disposed opposite the engagement member at the position of the coiled tube body.
An antifriction layer for reducing friction resistance when the outer expansion pipe and the coiled pipe body are expanded is arranged between the outer expansion pipe and the coiled pipe body.
The outer expansion assembly further comprises at least two positioning cones which are matched with the outer sleeve or the well wall in a positioning way, and when the outer expansion pipe is arranged, the positioning cones are arranged on the outer wall of the outer expansion pipe; when the outer expansion pipe is not arranged, the locating cone is arranged on the outer wall of the coiled pipe body; the positioning cones are arranged in a linear manner along the length direction of the coiled pipe body.
The engagement member includes internal teeth and external teeth engaged with each other, the internal teeth being arranged to have a length equal to a moving length of the coiled tube body outer ring; the arrangement length of the external teeth is smaller than that of the internal teeth, and the external teeth are positioned at the front ends of the internal teeth through a pipe body positioning piece.
The inner expansion assembly comprises a pull rod, a push rod and an expansion unit, wherein the pull rod is axially movably sleeved in the push rod, the expansion unit comprises two groups of connecting rod parts symmetrically arranged on two sides of the center of the winding pipe body, each group of connecting rod parts comprises an expansion block, a lower expansion connecting rod and an upper expansion connecting rod, the expansion block is attached to the inner wall of the winding pipe body, the upper expansion connecting rod is hinged with the push rod and the expansion block respectively, and the lower expansion connecting rod is hinged with the pull rod and the expansion block respectively.
The expansion units are at least two groups, and a plurality of groups of expansion units are arranged side by side along the length direction of the winding type pipe body.
The expansion unit further comprises an upper ejector block and a lower pull block, the upper expansion connecting rod is hinged with the ejector rod through the upper ejector block, and the lower expansion connecting rod is hinged with the pull rod through the lower pull block.
Compared with the prior art, the invention has the advantages that:
The invention sets the outer expansion assembly to comprise the coiled pipe body, the meshing part and the pipe body positioning part, wherein the coiled pipe body is arranged in a mode that the radial expansion space of the pipe body is large, the expansion rate of the coiled pipe body under the limit condition of construction is far higher than that of the traditional expansion pipe, the expansion plugging mechanism can be effectively ensured to be expanded to a set plugging position, and the damaged position of the casing or the unstable well section of the well wall can be reliably and effectively plugged. The overlapping part of the coiled pipe body is mutually meshed through the meshing part, and the inner meshing angle of the meshing part is arranged towards the moving direction of the outer ring of the coiled pipe body, so that the diameter of the coiled pipe body can only be enlarged and cannot be reduced in the construction process, the problem that the traditional expansion pipe is contracted inwards under the action of the pressure of surrounding rock of a shaft after the construction is finished is effectively solved, the casing pipe or a destabilizing well section in the subsequent construction process can be effectively blocked, and the stratum stability is ensured. Meanwhile, the pipe locating piece is arranged at the position of the meshing part, fixes the coiled pipe body before expansion and shears off during expansion, and ensures effective expansion of the expansion plugging mechanism while facilitating the reliable descending of the expansion plugging mechanism into a well.
The inner expansion assembly is arranged in the outer expansion assembly, and the outer expansion assembly can radially expand to be attached to an external casing or a well wall under the expansion force of the inner expansion assembly. Meanwhile, the coiled pipe body can be integrally and uniformly expanded under the action of the inner expansion assembly, the expansion stress is uniform, the problem of low strength of the pipe body due to stress concentration is not easy to occur, and the safety risk is low. Therefore, the reliable reinforcement and repair of the casing and the easy-to-leak and easy-to-collapse stratum can be realized by the underground expansion plugging mechanism, so that the old well is revived to continue to produce oil. And the whole structure is simple, the operation is convenient, and the cost is low.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic perspective view of an outer expansion assembly according to embodiment 1 of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic view of the positional relationship of the engaging members of the present invention.
FIG. 4 is a schematic diagram of an expansion assembly according to the present invention.
Fig. 5 is a schematic view showing the structure of an outer expansion assembly in embodiment 2 of the present invention.
Fig. 6 is another structural schematic diagram of the outer expansion assembly in embodiment 2 of the present invention.
Fig. 7 is a schematic view showing the structure of an outer expansion assembly in embodiment 3 of the present invention.
The reference numerals in the drawings denote:
1. an outer expansion assembly; 11. a coiled pipe body; 12. an engagement member; 121. internal teeth; 122. external teeth; 123. a mating surface; 124. a diameter line; 125. a sliding surface; 13. a tube body positioning member; 14. an outer expansion tube; 141. expanding the opening; 15. positioning cone; 2. an inner expansion assembly; 21. a pull rod; 22. a push rod; 23. an expansion unit; 231. an expansion block; 232. an upper expansion connecting rod; 233. a lower expansion connecting rod; 24. an upper top block; 25. and pulling down the block.
Detailed Description
The invention will now be described in further detail with reference to the drawings and the specific examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 3, the downhole expansion plugging mechanism of the present embodiment includes an outer expansion assembly 1 and an inner expansion assembly 2. The inner expansion assembly 2 is arranged in the outer expansion assembly 1 to provide expansion force of the outer expansion assembly 1. The outer expansion assembly 1 comprises a coiled pipe body 11, an engagement part 12 and a pipe body positioning piece 13, wherein the coiled pipe body 11 is an expandable coiled pipe body 11, and the coiled pipe body 11 is formed by coiling steel plates and overlapped at two ends; the overlapped parts of the coiled pipe body 11 are mutually meshed through the meshing parts 12, and the inner meshing angle of the meshing parts 12 is arranged towards the moving direction of the outer ring of the coiled pipe body 11, so that the coiled pipe body 11 is effectively expanded and simultaneously the coiled pipe body 11 is effectively prevented from backing after being expanded; the pipe positioner 13 is arranged at the position of the engagement part 12, so that the position of the coiled pipe 11 can be conveniently fixed when the mechanism enters a well, and the pipe positioner 13 is sheared when the coiled pipe 11 expands. The underground expansion plugging mechanism has the advantages of simple integral structure, convenient operation and low cost, and can realize reliable reinforcement and repair of the casing and the easy-to-leak and easy-to-collapse stratum by being put into the underground expansion plugging mechanism, so that the old well is revived to continue to produce oil.
The coiled pipe body 11 is arranged in a mode that the radial expansion space of the pipe body is large, the expansion rate of the coiled pipe body 11 under the limit condition of construction is far higher than that of a traditional expansion pipe, the expansion plugging mechanism can be effectively ensured to be expanded to a set plugging position, and the reliable and effective plugging of a damaged position of a sleeve or a unstable well section of a well wall can be realized.
The overlapping part of the coiled pipe body 11 is mutually meshed through the meshing part 12, and the inner meshing angle of the meshing part 12 is arranged towards the moving direction of the outer ring of the coiled pipe body 11, so that the diameter of the coiled pipe body 11 can only be enlarged and cannot be reduced in the construction process, the problem that the traditional expansion pipe is contracted inwards under the action of the surrounding rock pressure of a shaft after the construction is finished is effectively solved, the casing pipe or a unstable well section in the subsequent construction process can be effectively blocked, and the stratum stability is ensured. Meanwhile, as shown in fig. 3, the above-described arrangement of the engaging member 12 is such that the engagement surfaces 123 of the internal teeth 121 and the external teeth 122 are located between the diametrical line 124 passing through the tooth tips and the sliding surfaces 125 of the internal teeth 121 and the external teeth 122. When the coiled pipe body 11 is subjected to the pressing force F shown in fig. 3, the normal contact force F N on the engagement surface 123 counteracts a part of the pressing force in addition to the elastic force of the coiled pipe body 11 itself, so that the extrusion resistance of the coiled pipe body 11 can be further improved.
Meanwhile, the pipe body positioning piece 13 is arranged at the position of the meshing part 12, fixes the coiled pipe body 11 before expansion and shears off during expansion, and ensures effective expansion of the expansion plugging mechanism while facilitating the reliable descending of the expansion plugging mechanism into a well.
The inner expansion assembly is arranged in the outer expansion assembly 1, the outer expansion assembly 1 can radially expand and fit with an external casing or a well wall under the expansion force of the inner expansion assembly, and compared with the traditional concave expansion pipe, the inner expansion assembly has the advantages of controllable expansion diameter and adjustable expansion force, and has wide application range. Meanwhile, the coiled pipe body 11 can be uniformly expanded integrally under the action of the inner expansion assembly, the expansion stress is uniform, the problem of low strength of the pipe body due to stress concentration is not easy to occur, and the safety risk is low.
The invention aims to reduce the influence of the strength of the pipe body positioning piece 13 on the expansion resistance in the expansion process of the coiled pipe body 11 while ensuring that the underground expansion plugging mechanism reliably goes down the well, and properly designs the shearing strength of the pipe body positioning piece 13. In this embodiment, the shearing strength of the pipe locating piece 13 is designed to be 1.2 times of the pressure of the drilling fluid column, so that the pipe locating piece 13 is not easy to shear when going down the well, and can effectively shear when needing to expand, and the reliable running and expansion of the coiled pipe 11 are ensured. In other embodiments, the shear strength of the pipe positioner 13 is selected to be between 1.1 and 1.3 times the pressure of the drilling fluid column, as long as the function of the pipe positioner 13 is ensured. In this embodiment, the pipe positioner 13 is a rivet.
Since the coiled tubing 11 will be subjected to the pressure of the drilling fluid column while in the well, if the coiled tubing 11 is too low in strength, it will not resist the external force and will be easily deformed. In this embodiment, the maximum circumferential compressive stress of the inner surface of the coiled pipe body 11 is smaller than the yield stress of the coiled pipe body 11, so that the coiled pipe body 11 has a certain strength and can bear external pressure, and the coiled pipe body 11 can reliably seal the damaged position when being supported to the well wall or the sleeve.
Preferably, the maximum circumferential compressive stress of the inner surface of the coiled tube 11 is 90% of the yield stress of the coiled tube 11. The coiled pipe body 11 has enough strength and is not easy to deform under the action of liquid column pressure, meanwhile, the problem that the wall thickness and the material requirements of the coiled pipe body 11 are too high due to the fact that the design strength is too high is avoided, the wall thickness of the coiled pipe body 11 is increased, the well entering is not facilitated, the material requirements are high, the cost is increased, and the underground expansion mechanism is guaranteed to effectively enter the well and be blocked, and meanwhile the cost is saved.
Further, as shown in fig. 1 and 2, the outer expansion assembly 1 further includes two positioning cones 15, the two positioning cones 15 are disposed on the outer wall of the coiled pipe body 11, and the two positioning cones 15 are arranged in a linear arrangement along the length direction of the coiled pipe body 11. The setting of locating cone 15 has realized the expansion step by step of coiled tubing 11 for coiled tubing 11 better laminating is on the wall of a well or sleeve pipe, guarantees the reliable reinforcement and the restoration of sleeve pipe and easy hourglass easy formation. In this embodiment, the positioning cone 15 is made of cemented carbide. In other embodiments, the positioning cone 15 may be provided as three, four, etc.
As shown in fig. 2, the engagement member 12 includes internal teeth 121 and external teeth 122 that are engaged with each other. The arrangement length of the internal teeth 121 is equal to the moving length of the outer ring of the coiled pipe body 11, so that the coiled pipe body 11 has high expansion rate and enough expansion range, and the underground expansion plugging mechanism can be effectively expanded to a set plugging position. The arrangement length of the external teeth 122 is smaller than that of the internal teeth 121, and the external teeth 122 are positioned at the front ends of the internal teeth 121 by the pipe positioner 13. When the pipe positioner 13 shears, the external teeth 122 move along the front ends of the internal teeth 121 toward the distal ends, so that the coiled pipe 11 is reliably expanded, and the limit state of expansion of the coiled pipe 11 is such that the external teeth 122 mesh with the endmost internal teeth 121.
As shown in fig. 4, the inner expansion assembly 2 includes a pull rod 21, a push rod 22, and an expansion unit 23. The pull rod 21 is axially movably sleeved in the ejector rod 22, and the expansion unit 23 comprises two groups of connecting rod components which are symmetrically arranged at two sides of the center of the coiled pipe body 11. Each group of connecting rod components comprises an expansion block 231, an upper expansion connecting rod 232 and a lower expansion connecting rod 233, wherein the expansion block 231 is attached to the inner wall of the coiled pipe body 11, the upper expansion connecting rod 232 is hinged with the ejector rod 22 and the expansion block 231 respectively, and the lower expansion connecting rod 233 is hinged with the pull rod 21 and the expansion block 231 respectively.
The invention drives the upper expansion connecting rod 232 and the lower expansion connecting rod 233 to be relatively close by the relative movement of the pull rod 21 and the push rod 22, and at the moment, the expansion block 231 moves outwards to realize the expansion of the coiled pipe body 11. After that, the inner expansion assembly 2 is sent down, and whether the coiled pipe body 11 is fully expanded is verified, if the inner expansion assembly 2 is left unobstructed, the inner expansion assembly can be taken out. The inner expansion assembly 2 of the invention has simple structure and convenient operation, and has the functions of expanding the coiled pipe body 11 and verifying whether the coiled pipe body 11 is fully expanded in place.
In the present embodiment, the expansion units 23 are provided in three groups, and the three groups of expansion units 23 are arranged side by side along the length direction of the coiled pipe body 11. The plurality of expansion units 23 are used in parallel in such a manner that the coiled pipe body 11 expands uniformly in the radial direction. Meanwhile, the three groups of expansion units 23 are nested, so that the arrangement space of the expansion units 23 is shortened while the reliable expansion of the coiled pipe body 11 is ensured. In other embodiments, the expansion units 23 may be selected according to practical situations, for example, two groups, four groups, etc.
Further, the expansion unit 23 further comprises an upper top block 24 and a pull-down block 25. The upper expansion link 232 is hinged with the ejector rod 22 through an upper ejector block 24, and the lower expansion link 233 is hinged with the pull rod 21 through a lower pull block 25. The expansion block 231 can be driven to radially expand by driving the pull rod 21 to move upwards together with the pull-down block 25, so that the coiled pipe body 11 can be expanded.
In this embodiment, the working principle of the underground expansion plugging mechanism is as follows: the overlapped portions of the coiled pipe body 11 are fixed together by using the pipe body positioning member 13 so that the inner surface of the coiled pipe body 11 is always in a circumferentially compressed state. When the outer expansion assembly 1 works, under the extrusion expansion force of the inner expansion assembly 2, the pipe body positioning piece 13 is cut off firstly, and then the circumferential compressive stress on the inner surface of the coiled pipe body 11 is released, so that the diameter of the coiled pipe body 11 is increased for the first time; the inner expansion assembly 2 then continues to operate to further expand the diameter of the coiled tubing 11, at which time the inner surface of the coiled tubing 11 begins to enter a tensile stress state and increases with the diameter, eventually entering a yield state, and the diameter of the coiled tubing 11 further increases due to the plasticity of the coiled tubing 11 material until it is fully supported against the inside wall or wall of the casing being repaired and some excessive plastic deformation occurs. After the repair work is completed, the expansion pipe will remain in the damaged area of the casing or well wall and the inner expansion assembly 2 will be lifted out of the well.
Example 2
Fig. 5 shows another embodiment of the downhole expansion plugging mechanism of the present invention, which is substantially the same as embodiment 1, except that the outer expansion assembly 1 of the present embodiment further comprises an outer expansion tube 14, the outer expansion tube 14 being provided with expansion openings 141 to provide expansion space for the outer expansion tube 14. The outer expansion pipe 14 is wrapped on the outer side of the coiled pipe body 11, and the combined arrangement of the outer expansion pipe 14 and the coiled pipe body 11 further improves the extrusion resistance of the coiled pipe body 11. Meanwhile, the positioning cones 15 are provided on the outer wall of the outer expansion pipe 14, and the positioning cones 15 are arranged in a straight line along the length direction of the coiled pipe body 11.
In this embodiment, the expansion openings 141 of the outer expansion pipe 14 are overlapped with each other, and the overlapped part is provided with inner and outer meshing teeth, so that the extrusion resistance of the pipe body is further improved by the arrangement of the meshing teeth; meanwhile, the inner engagement angle is set towards the moving direction of the outer ring of the outer expansion pipe 14, so that the outer expansion pipe 14 is prevented from backing after expansion while effective expansion of the outer expansion pipe 14 is ensured. In other embodiments, as shown in FIG. 6, the overlapping portions of the outer expansion pipe 14 may not be provided with inner and outer engagement teeth.
Further, the expansion opening 141 is disposed opposite the engagement member 12 at the position of the coiled tubing 11 to ensure uniform expansion of the downhole expansion plugging mechanism.
Further, an antifriction layer is provided between the outer expansion pipe 14 and the coiled pipe body 11 to reduce frictional resistance between the outer expansion pipe 14 and the coiled pipe body 11 during expansion. In this embodiment, the antifriction layer is a lubricating grease layer.
Example 3
Fig. 7 shows another embodiment of the downhole expansion plugging mechanism of the present invention, which is substantially the same as embodiment 2, except that the expansion opening 141 of the outer expansion pipe 14 of the present example is provided with an expansion gap disposed opposite the engagement member 12 at the position of the coiled pipe body 11. The underground expansion plugging mechanism can expand uniformly, and the outer expansion pipe 14 can be tightly attached to a casing or a well wall to be repaired.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (1)
1. The underground expansion plugging mechanism is characterized by comprising an outer expansion assembly and an inner expansion assembly arranged in the outer expansion assembly to provide expansion acting force, wherein the outer expansion assembly comprises an expandable coiled pipe body, an engagement part for preventing the coiled pipe body from retreating after expanding, and a pipe body positioning piece for fixing the position of the coiled pipe body, overlapped parts of the coiled pipe body are engaged with each other through the engagement part, and the inner engagement angle of the engagement part is arranged towards the moving direction of the outer ring of the coiled pipe body; the pipe body positioning piece is arranged at the position of the meshing part, so that the inner surface of the coiled pipe body is always in a circumferential compression state, the pipe body positioning piece is sheared when the coiled pipe body is expanded, so that circumferential compression stress on the inner surface of the coiled pipe body is released, the diameter of the coiled pipe body is increased, then the inner expansion assembly continues to work, the diameter of the coiled pipe body is further increased, and at the moment, the inner surface of the coiled pipe body starts to enter a tensile stress state until the inner surface of the coiled pipe body is completely supported on the inner wall or the well wall of a repaired casing and generates certain excessive plastic deformation; the engagement member includes internal teeth and external teeth engaged with each other, the internal teeth being arranged to have a length equal to a moving length of the wound tube body outer ring, the external teeth being arranged to have a length smaller than the internal teeth, and the external teeth being positioned at front ends of the internal teeth by a tube body positioning member; the outer expansion assembly further comprises at least two positioning cones which are matched with the outer casing or the well wall in a positioning manner;
The inner expansion assembly comprises a pull rod, a push rod and an expansion unit, wherein the pull rod is axially movably sleeved in the push rod, the expansion unit comprises two groups of connecting rod parts symmetrically arranged at two sides of the center of a winding type pipe body, each group of connecting rod parts comprises an expansion block, a lower expansion connecting rod and an upper expansion connecting rod, the expansion block is attached to the inner wall of the winding type pipe body, the upper expansion connecting rod is respectively hinged with the push rod and the expansion block, the lower expansion connecting rod is respectively hinged with the pull rod and the expansion block,
The expansion units are at least two rows, a plurality of rows of expansion units are arranged side by side along the length direction of the winding type pipe body,
The expansion unit further comprises an upper ejector block and a lower pull block, the upper expansion connecting rod is hinged with the ejector rod through the upper ejector block, and the lower expansion connecting rod is hinged with the pull rod through the lower pull block.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011283049.4A CN114508316B (en) | 2020-11-17 | 2020-11-17 | Underground expansion plugging mechanism |
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| CN202011283049.4A CN114508316B (en) | 2020-11-17 | 2020-11-17 | Underground expansion plugging mechanism |
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| CN114508316A CN114508316A (en) | 2022-05-17 |
| CN114508316B true CN114508316B (en) | 2024-06-25 |
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| CN113585999B (en) * | 2021-07-15 | 2023-05-26 | 中国石油天然气股份有限公司 | Expansion pipe |
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| CN102889064A (en) * | 2012-10-16 | 2013-01-23 | 西南石油大学 | Method for fixing underground corrugated pipe |
| CN206647684U (en) * | 2016-12-15 | 2017-11-17 | 河北联润在线工程技术有限公司 | Tapered pipeline digging-free prosthetic device |
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