CN112177565A - Salvaging type drilling-plug-free cementing well completion device - Google Patents
Salvaging type drilling-plug-free cementing well completion device Download PDFInfo
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- CN112177565A CN112177565A CN202011035585.2A CN202011035585A CN112177565A CN 112177565 A CN112177565 A CN 112177565A CN 202011035585 A CN202011035585 A CN 202011035585A CN 112177565 A CN112177565 A CN 112177565A
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- 238000007789 sealing Methods 0.000 claims abstract description 122
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 230000000670 limiting effect Effects 0.000 claims description 49
- 239000002184 metal Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 abstract description 30
- 239000003245 coal Substances 0.000 abstract description 14
- 238000011161 development Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 12
- 238000005553 drilling Methods 0.000 abstract description 9
- 239000002195 soluble material Substances 0.000 abstract description 8
- 230000006872 improvement Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 18
- 238000003780 insertion Methods 0.000 description 12
- 230000037431 insertion Effects 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000012856 packing Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000002512 anti-withdrawal effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002699 waste material Substances 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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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 application discloses a salvage type drilling-plug-free cementing well completion device which can guarantee the existing half-range well cementation and completion mode of coal bed gas and improve the well cementation quality; meanwhile, after the construction is finished, the special tool is put in, the fishing assembly can be fished out of the shaft, so that the drilling and plugging are avoided, the construction cost is reduced, the shaft building period is shortened, after the construction is finished, the special tool is put in, the recyclable inner core is fished out of the shaft, the next operation procedure can be carried out, the recyclable inner core is repaired, and then the tool is continuously assembled, so that the purposes of cost reduction and efficiency improvement are achieved; and a special soluble material technology is adopted, namely a soluble upper sealing sleeve and a soluble lower sealing sleeve are added into the tool, so that the tool is ensured to be intact before entering the well, and after construction is finished, the soluble material reacts with the plugging fluid and is dissolved, the effect that the inner diameter of the tool is completely consistent with the inner diameter of the casing is achieved, the operation pipe column and the tool in the later period are completely unaffected to be put in, and the requirement of efficient development of the coal bed gas is completely met.
Description
Technical Field
The invention relates to the technical field of oil and gas well development, in particular to a salvage type drilling-plug-free cementing well completion device.
Background
The coal bed gas resources in China are quite rich, but the exploration and development of the coal bed gas in China are still in the starting stage due to the reasons of poor stability of a target layer, low permeability and the like of the coal bed gas development. In recent years, with the national emphasis on environmental protection, energy conservation and emission reduction, in the field of development and development of oil and gas wells, along with the development of well drilling and completion technology, the concepts of environmental protection and resource recycling are gradually mentioned. The development and completion mode of the coal bed gas at the present stage is mainly a half-stroke cementing completion process, the process has a good effect on the current coal bed gas development, and the process has been widely popularized and applied after the development of over ten years. However, as the development of coal bed methane has advanced and the value of people changes, the problems exposed by the well completion process are increased.
After the construction of the process is finished, the well cementation accessory cleaning operation must be carried out in the later period, the process of drilling and removing the internal accessories is low in efficiency and long in production period, a series of secondary risks such as drill plug residue, casing penetration and falling objects exist, and certain influence is generated on the subsequent construction operation.
In addition, in the process of drilling out the accessories, long-time and high-strength work brings certain health threats to well site workers. The longer the time that the drilling crew is stationed, the more the potential safety hazards exist, the greater the influence on the surrounding environment of the well site is, the more the environmental problems are brought, and the greater the difficulty in later-stage treatment is.
For the existing drilling and plugging-free completion tool, the inner diameter of the tool used on site often cannot reach the inner diameter of a casing, even is smaller than the drift diameter in the casing, and the reduced diameter is left on a completion pipe string, so that great risk is brought to the subsequent construction operation tool. And the inner core fished out of the shaft after construction is often unusable and can only be abandoned, which causes great resource waste and does not meet the advocated cost reduction and efficiency improvement advocated by the state.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a salvage type drilling-plug-free cementing well completion device which can ensure the existing half-range well cementation and completion mode of coal bed gas and improve the well cementation quality; meanwhile, after the construction is finished, the special tool is put in, the fishing assembly can be fished out of the shaft, so that the drilling and plugging are avoided, the construction cost is reduced, the shaft building period is shortened, after the construction is finished, the special tool is put in, the recyclable inner core is fished out of the shaft, the next operation procedure can be carried out, the recyclable inner core is repaired, and then the tool is continuously assembled, so that the purposes of cost reduction and efficiency improvement are achieved; and a special soluble material technology is adopted, namely a soluble upper sealing sleeve and a soluble lower sealing sleeve are added into the tool, so that the tool is ensured to be intact before entering the well, and after construction is finished, the soluble material reacts with the plugging fluid and is dissolved, the effect that the inner diameter of the tool is completely consistent with the inner diameter of the casing is achieved, the operation pipe column and the tool in the later period are completely unaffected to be put in, and the requirement of efficient development of the coal bed gas is completely met. .
In order to achieve the purpose, the invention provides a salvage type drilling-plug-free cementing well completion device which comprises a well retaining part, a salvage assembly, a soluble upper sealing sleeve and a soluble lower sealing sleeve; the well-reserving part comprises a body, a limiting part, a sliding part, a sealing part, an expansion component and a trigger part, the sliding part is slidably arranged on the inner side of the body, the fishing component is fixed on the inner side of the upper part of the body through the limiting part, the fishing component is fixed with the inner side of the sliding part, the soluble upper sealing sleeve is fixed on the inner side of the sliding part and positioned between the fishing component and the sliding part, the body, the sliding part, the soluble upper sealing sleeve and the fishing component are all provided with circulation holes, the circulation holes are oppositely arranged, the sealing part is sleeved on the outer side of the body, and the upper part of the sealing part is sleeved in the circulation holes and seals the circulation holes; the inner side of the lower part of the body is fixedly provided with the soluble lower sealing sleeve, the outer side of the lower part of the fishing assembly is fixedly connected with the inner side of the soluble lower sealing sleeve, the body and the soluble lower sealing sleeve are both provided with overflowing holes which are oppositely arranged, the lower part of the fishing assembly is provided with an overflowing channel communicated with the overflowing holes, an overflowing gap communicated with the overflowing holes is formed between the lower part of the sealing element and the body, and the overflowing gap is communicated with the inside of the expansion assembly; the trigger piece is fixed in the inboard of fishing subassembly and will overflow the passageway and seal. The salvage type drilling-plug-free cementing well completion device can ensure the existing half-range cementing well completion mode of coal bed gas and improve the cementing quality; meanwhile, after the construction is finished, the special tool is put in, the fishing assembly can be fished out of the shaft, so that the drilling and plugging are avoided, the construction cost is reduced, the shaft building period is shortened, after the construction is finished, the special tool is put in, the recyclable inner core is fished out of the shaft, the next operation procedure can be carried out, the recyclable inner core is repaired, and then the tool is continuously assembled, so that the purposes of cost reduction and efficiency improvement are achieved; and a special soluble material technology is adopted, namely a soluble upper sealing sleeve and a soluble lower sealing sleeve are added into the tool, so that the tool is ensured to be intact before entering the well, and after construction is finished, the soluble material reacts with the plugging fluid and is dissolved, the effect that the inner diameter of the tool is completely consistent with the inner diameter of the casing is achieved, the operation pipe column and the tool in the later period are completely unaffected to be put in, and the requirement of efficient development of the coal bed gas is completely met.
In one example, the expansion component includes a rubber sleeve joint, a central pipe, a rubber sleeve assembly and a lower joint, the upper end of the rubber sleeve joint is fixedly connected with the sealing element and the body, the inner side of the lower end of the rubber sleeve joint is in threaded connection with the central pipe, the outer side of the lower end of the rubber sleeve joint is in threaded connection with the rubber sleeve assembly, the inner side of the upper end of the lower joint is in threaded connection with the outer side of the lower end of the central pipe, the outer side of the upper end of the lower joint is in threaded connection with the inner side of the lower end of the rubber sleeve assembly, a sealing cavity is formed among the rubber sleeve joint, the central pipe, the rubber sleeve assembly and the lower joint, a joint channel is arranged inside the rubber sleeve joint, and two ends of the joint channel are respectively communicated with the sealing cavity and the overflowing gap. When the pressure is applied, the high-pressure liquid can flow into the sealing cavity formed by the rubber barrel joint, the central pipe, the rubber barrel assembly and the lower joint through the overflowing gap and the joint channel.
In one example, the two ends of the rubber cylinder assembly are metal pieces with internal threads, the middle part of the rubber cylinder assembly is a pressure expansion part, and two sides of the pressure expansion part are fixed on the metal pieces. The pressurized expansion part is made of elastic materials and has the pressurized expansion effect, and along with the inflow of high-pressure liquid into the sealing cavity, the pressurized expansion part gradually expands and finally clings to the inner wall of the shaft, so that the pipe string is divided into an upper part and a lower part.
In one example, the flow gap includes an enlarged section proximate the expansion assembly and a reduced section distal the expansion assembly; the overflowing gap is sealed by a rubber barrel pressure limiting ring, the rubber barrel pressure limiting ring is provided with an expansion end and a reduction end which are opposite, the expansion end is located in the expansion section, the reduction end is located in the reduction section, the rubber barrel pressure limiting ring is fixedly connected with the body through a rubber barrel closing shear pin, and the rubber barrel pressure limiting ring can move to the position where the outer side of the rubber barrel pressure limiting ring abuts against the inner side of the sealing piece. When high-pressure liquid is pressurized into the sealing cavity, the pressure is gradually increased along with the fact that the rubber sleeve assembly is gradually filled with the high-pressure liquid, when the pressure is increased to a certain value, due to the fact that the pressure bearing areas of the expansion end and the reduction end of the rubber sleeve pressure limiting ring are different, the stress on the two ends is different, the force borne by the expansion end is larger than the force borne by the reduction end, the rubber sleeve closing shear pin can be sheared, the rubber sleeve pressure limiting ring moves upwards and moves to the position where the outer side of the rubber sleeve pressure limiting ring is abutted to the inner side of the sealing piece, the overflowing gap is sealed, and expansion of the rubber sleeve assembly is finished.
In one example, the sliding part is arranged as a closing sliding sleeve, the outer side of the closing sliding sleeve is provided with a long groove, the inner side of the body is convexly provided with a guide part, and the guide part extends into the long groove so that the closing sliding sleeve can move up and down relative to the body. The closing sliding sleeve can move up and down relative to the body through the matching of the guide piece and the long groove, and the length of the long groove is the size of the up-and-down moving range of the closing sliding sleeve; simultaneously, rectangular groove can also avoid closing the sliding sleeve and produce rotary motion.
In one example, the upper end of the body has a stepped structure inside; the locating part includes top connection, locking piece, closes chock and spacing ring, the lower extreme outside of top connection with the inboard threaded connection in upper end of body, the spacing ring is fixed in stair structure department just the upper end of spacing ring with the lower extreme butt of top connection, the lower extreme inboard of top connection with the upper end inboard of spacing ring all is provided with the inclined plane, the locking piece passes salvage the subassembly and with inclined plane looks butt, close the chock be fixed in salvage the subassembly inboard and with the lateral surface looks butt of locking piece. Mutually supporting through inboard inclined plane of top connection lower extreme, the inboard inclined plane in spacing ring upper end and locking piece and closing the stopper seat fixes the upper end at the body of salvaging the subassembly, makes the slider fixed well so that the slider can be along with salvaging the subassembly motion simultaneously with salvaging the subassembly, reaches the effect that the circulation hole on the body staggers with the circulation hole on the slider.
In one example, the sealing element comprises an opening sliding sleeve and an outer sliding sleeve, the upper end of the opening sliding sleeve seals the circulating hole, the lower end of the opening sliding sleeve abuts against the upper end of the outer sliding sleeve, the inner side of the outer sliding sleeve below the overflowing hole is outwards recessed to form the overflowing gap communicated with the overflowing hole, the opening sliding sleeve is connected with the body through shear pins, and the outer sliding sleeve is connected with the expansion assembly through shear pins. Under the effect of pressure, open the sliding sleeve and can break off being connected and the downstream with the body, expose the circulation hole, can drive outer sliding sleeve downstream when opening the sliding sleeve downstream, the inboard outside sunken part downstream of outer sliding sleeve, the tip butt that does not outside sunken part and overflowing hole in the inboard of outer sliding sleeve up to, will cross the orifice and seal.
In one example, the expansion assembly is provided with a limiting part in a protruding manner on the outer side, a certain distance is reserved between the lower end of the outer sliding sleeve and the limiting part, and the outer sliding sleeve can move to a position where the lower end of the outer sliding sleeve abuts against the limiting part. Spacing portion can be to the motion of opening sliding sleeve and outer sliding sleeve doing limiting displacement, opens sliding sleeve and outer sliding sleeve downstream jointly, when outer sliding sleeve moved to the position of its lower extreme and spacing portion butt, the discharge orifice was shutoff, and outer sliding sleeve stops downstream, and spacing portion can avoid opening the lower extreme slippage of sliding sleeve and outer sliding sleeve follow body and go out.
In one example, a stop is fixed to the inside of the fishing assembly and is located below the trigger, the trigger having a sealing state that seals the transfer passage and an overflowing state that exposes the transfer passage and abuts against the stop. When the trigger does not reach certain pressurized value, the trigger is in the sealed state that will overflow the passageway, high-pressure liquid can't get into sealed chamber through overflowing the passageway, when the trigger reaches certain pressurized value, the trigger breaks away from and downstream from the inboard of salvaging the subassembly, until exposing the passageway that overflows, allow high-pressure liquid to get into sealed chamber through overflowing the passageway, the trigger downstream stops downstream when the state with the stop part butt, the stop part can avoid the trigger to go out from the lower extreme slippage of body.
In one example, an annular boss structure is convexly arranged on the inner side of the lower end of the body, a first abutting surface is formed at the upper end of the boss structure, a certain distance is reserved between the lower end of the sliding piece and the first abutting surface, and the sliding piece can move to a position where the lower end of the sliding piece abuts against the first abutting surface. When the sliding part moves downwards, the circulation holes in the body and the circulation holes in the sliding part can be staggered to close the channel inside and outside the body, when the lower end of the sliding part moves to be abutted against the first abutting surface, the sliding part stops moving, and the first abutting surface can prevent the sliding part from being separated from the inside of the body.
In one example, the inner side of the body is recessed outwards to form an annular groove structure, the first abutting surface forms the lower end surface of the groove structure, and the upper end surface of the groove structure is a second abutting surface; the outer side of the sliding part is sleeved with an anti-withdrawing clamp spring, and when the sliding part moves to the position where the lower end of the sliding part is abutted to the first abutting surface, the anti-withdrawing clamp spring is abutted to the second abutting surface. When the sliding part moves to the position abutted against the first abutting surface, the sliding part is limited by the structures at two positions, the first abutting surface limiting sliding part moves downwards, the anti-withdrawing clamp spring and the second abutting surface limiting sliding part move upwards, and the sliding part can be fixed at a certain position under the limiting action of the first abutting surface, the anti-withdrawing clamp spring and the second abutting surface.
In one example, the soluble lower sealing boot is secured to the inside of the boss structure, and the boss structure, the slider, and the expansion assembly all have the same inside diameter. When the lower end of the sliding part is abutted against the first abutting surface, the sliding part, the boss structure and the expansion assembly have the same inner diameter, and after the soluble upper sealing sleeve on the inner side of the sliding part and the soluble lower sealing sleeve on the inner side of the boss structure are dissolved, the inner wall with the consistent inner diameter can be formed, and the effect of the consistent inner diameter of the sleeve is achieved.
In one example, the fishing assembly comprises a recyclable fishing inner core and a lower sealing insertion pipe, the lower end of the recyclable fishing inner core is fixedly connected with the upper end of the lower sealing insertion pipe, the recyclable fishing inner core is provided with the recycling hole, and the lower sealing insertion pipe is provided with the overflowing channel.
In one example, a sealing groove is formed in the outer side of the recyclable fishing inner core, the sealing grooves are respectively located on two sides of the recycling hole, and a large-gap sealing ring is arranged in each sealing groove; the sealing groove is formed in the outer side of the lower sealing insertion pipe, the sealing grooves are respectively located on two sides of the overflowing channel, and the large-gap sealing ring is arranged in the sealing groove. The large-gap sealing ring in the sealing groove mainly seals the circulating hole and the overflowing channel, and liquid pressed in is prevented from flowing out of the circulating hole and the two sides of the overflowing channel.
Drawings
The drawings described herein are only for assisting those skilled in the art in understanding the technical solutions of the present invention, and the exemplary embodiments of the present invention described in conjunction with the drawings are only for explaining the technical solutions of the present invention and do not constitute a limitation of the present invention. In the drawings:
FIG. 1 is a partial cross-sectional view of an overshot drill-plug free cementing completion assembly provided in accordance with an embodiment of the present invention;
FIG. 2 is a front view of a sealing ball provided in accordance with an embodiment of the present invention;
fig. 3 is a front view of a replacement rubber plug provided in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the invention during the construction of an salvage type drilling-plug-free cementing completion device;
fig. 5 is a schematic diagram of a first state of the salvage type drilling-plug-free cementing completion device provided by the embodiment of the invention during construction;
FIG. 6 is a schematic diagram of a second state of the salvage type drilling-plug-free cementing completion device according to the embodiment of the present invention during construction;
FIG. 7 is a schematic diagram of a third state of the salvage type drilling-plug-free cementing completion device according to the embodiment of the present invention during construction;
fig. 8 is a schematic diagram illustrating a fourth state of the salvage type drilling-plug-free cementing completion device according to the embodiment of the present invention during construction;
fig. 9 is a schematic diagram illustrating a fifth state of the salvage type drilling-plug-free cementing completion device according to the embodiment of the present invention during construction;
fig. 10 is a schematic diagram of a sixth state of the salvage type drilling-plug-free cementing completion device according to the embodiment of the present invention during construction.
List of reference numerals:
the salvaging type drilling-plug-free cementing well completion device 1, a soluble upper sealing sleeve 2, a soluble lower sealing sleeve 3, a body 4, a sliding part 5, a trigger part 6, a circulating hole 7, an overflowing hole 8, an overflowing channel 9, an overflowing gap 10, a rubber sleeve joint 11, a central pipe 12, a rubber sleeve assembly 13, a lower joint 14, a joint channel 15, a metal part 16, a pressed expansion part 17, an expansion section 18, a reduced section 19, a rubber sleeve limiting ring 20, an expansion end 21, a reduced end 22, a rubber sleeve closing shear pin 23, a long strip groove 24, a guide part 25, a step structure 26, an upper joint 27, a locking block 28, a closing plug seat 29, a limiting ring 30, an inclined surface 31, an opening sliding sleeve 32, an outer sliding sleeve 33, a limiting part 34, a stop part 35, a boss structure 36, a first abutting surface 37, a groove structure 38, a second abutting surface 39, an anti-withdrawal snap spring 40, a recyclable salvaging inner core 41, a lower sealing insertion pipe 42, a sealing groove, A seat sealing ball 45, a ball seat shear pin 46, a sealing ring 47, a replacing rubber plug 48 and special plugging liquid 49.
Detailed Description
In order to more clearly explain the overall concept of the invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for ease of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description of the present specification, reference to the description of the terms "one aspect," "some aspects," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the aspect or example is included in at least one aspect or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same solution or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more aspects or examples.
As shown in fig. 1 to fig. 1, the present invention provides a salvage type drilling-plug-free cementing completion device 1, which comprises a well-reserving part, a fishing assembly, a soluble upper sealing sleeve 2 and a soluble lower sealing sleeve 3; the well reserving part comprises a body 4, a limiting part, a sliding part 5, a sealing part, an expansion component and a trigger part 6, wherein the sliding part 5 is slidably arranged on the inner side of the body 4, a fishing component is fixed on the inner side of the upper part of the body 4 through the limiting part, the fishing component is fixed with the inner side of the sliding part 5, a soluble upper sealing sleeve 2 is fixed on the inner side of the sliding part 5, the soluble upper sealing sleeve 2 is positioned between the fishing component and the sliding part 5, the body 4, the sliding part 5, the soluble upper sealing sleeve 2 and the fishing component are all provided with circulation holes 7, the circulation holes 7 are oppositely arranged, the sealing part is sleeved on the outer side of the body 4, and the upper; a soluble lower sealing sleeve 3 is fixed on the inner side of the lower part of the body 4, the outer side of the lower part of the fishing assembly is fixedly connected with the inner side of the soluble lower sealing sleeve 3, the body 4 and the soluble lower sealing sleeve 3 are both provided with overflowing holes 8, the overflowing holes 8 are oppositely arranged, the lower part of the fishing assembly is provided with an overflowing channel 9 communicated with the overflowing holes 8, an overflowing gap 10 communicated with the overflowing holes 8 is arranged between the lower part of the sealing element and the body 4, and the overflowing gap 10 is communicated with the inside of the expansion assembly; the trigger 6 is fixed to the inside of the fishing assembly and seals the through-flow passage 9. The salvage type drilling-plug-free cementing well completion device 1 can ensure the existing half-range well cementation and completion mode of coal bed gas and improve the well cementation quality; meanwhile, after the construction is finished, the special tool is put in, the fishing assembly can be fished out of the shaft, so that the drilling blockage is avoided, the construction cost is reduced, the well building period is shortened, after the construction is finished, the special tool is put in, the fishing assembly is fished out of the shaft, the next operation procedure can be carried out, the fishing assembly is repaired, and then the tool is continuously assembled, so that the purposes of cost reduction and efficiency improvement are achieved; and a special soluble material technology is adopted, namely a soluble upper sealing sleeve 2 and a soluble lower sealing sleeve 3 are added into the tool, so that the tool is ensured to be intact before entering the well, after construction is finished, the soluble material and the plugging fluid react and dissolve, the effect that the inner diameter of the tool is completely consistent with the inner diameter of the casing is achieved, the operation pipe column and the tool in the later period are completely unaffected to be put in, and the requirement of efficient development of the coal bed gas is completely met.
Specifically, a thread is formed on the inner side of the lower end of the slider 5, and the soluble upper seal cartridge 2 is fitted from the lower end of the slider 5 and screwed by the thread.
In one embodiment, as shown in fig. 1, the expansion component includes a rubber cartridge joint 11, a central tube 12, a rubber cartridge assembly 13, and a lower joint 14, an upper end of the rubber cartridge joint 11 is fixedly connected to the sealing member and the body 4, a lower end inner side of the rubber cartridge joint 11 is in threaded connection with the central tube 12, a lower end outer side of the rubber cartridge joint 11 is in threaded connection with the rubber cartridge assembly 13, an upper end inner side of the lower joint 14 is in threaded connection with a lower end outer side of the central tube 12, an upper end outer side of the lower joint 14 is in threaded connection with a lower end inner side of the rubber cartridge assembly 13, a sealing cavity is formed among the rubber cartridge joint 11, the central tube 12, the rubber cartridge assembly 13, and the lower joint 14, a joint channel 15 is formed inside the rubber cartridge joint 11, and two ends of the joint. When the pressure is applied, the high-pressure liquid can flow into the sealed cavity formed by the rubber cartridge joint 11, the central tube 12, the rubber cartridge assembly 13 and the lower joint 14 through the flow gap 10 and the joint channel 15.
Specifically, the actual length of the rubber cylinder assembly 13 is greater than or equal to 1.5m, and the length of the central tube 12 corresponds to the actual length.
In one embodiment, as shown in fig. 1, the two ends of the rubber cylinder assembly 13 are metal members 16 with internal threads, the middle portion of the rubber cylinder assembly 13 is a pressure expansion portion 17, and the two sides of the pressure expansion portion 17 are fixed on the metal members 16. The compression expansion part 17 is made of elastic materials and has the compression expansion effect, and along with the inflow of high-pressure liquid into the sealing cavity, the compression expansion part 17 gradually expands and finally clings to the inner wall of the shaft, so that the pipe string is divided into an upper part and a lower part. Specifically, the pressure expansion part 17 may be made of a rubber material, and both sides of the pressure expansion part 17 may be directly vulcanized on the metal piece 16; other resilient materials may be used, and the present application is not limited in this respect.
In one embodiment, as shown in fig. 1, the flow gap 10 includes an enlarged section 18 proximate the expansion assembly and a reduced section 19 distal the expansion assembly; be provided with packing element pressure limiting ring 20 in overflowing clearance 10, packing element pressure limiting ring 20 has relative enlarged end 21 and minification end 22, and enlarged end 21 is located enlarged section 18, and minification end 22 is located minification section 19, and packing element pressure limiting ring 20 closes shear pin 23 through the packing element and body 4 fixed connection, and packing element pressure limiting ring 20 can move to the position of the inboard butt of the outside of packing element pressure limiting ring 20 and sealing member in order to overflow clearance 10 shutoff. When high-pressure liquid is pressurized into the sealing cavity, the pressure is gradually increased along with the fact that the rubber sleeve assembly 13 is gradually filled with the high-pressure liquid, when the pressure is increased to a certain value, due to the fact that the pressure bearing areas of the expansion end 21 and the reduction end 22 of the rubber sleeve pressure limiting ring 20 are different, the stress on the two ends is different, the force borne by the expansion end 21 is larger than the force borne by the reduction end 22, the rubber sleeve closing shear nail 23 can be cut off, the rubber sleeve pressure limiting ring 20 moves upwards and moves to the position where the outer side of the rubber sleeve pressure limiting ring 20 abuts against the inner side of the sealing piece, the overflowing gap 10 is sealed, and expansion of the rubber sleeve assembly 13 is finished.
In one embodiment, as shown in fig. 1, the sliding member 5 is configured as a closing sliding sleeve, the outer side of the closing sliding sleeve is provided with a long groove 24, the inner side of the body 4 is convexly provided with a guiding member 25, and the guiding member 25 extends into the long groove 24 so as to enable the closing sliding sleeve to move up and down relative to the body 4. The closing sliding sleeve can move up and down relative to the body 4 through the matching of the guide piece 25 and the strip groove 24, and the length of the strip groove 24 is the size of the up-and-down moving range of the closing sliding sleeve; at the same time, the slot 24 also prevents the sliding sleeve from rotating when it is closed.
Specifically, the closing sliding sleeve can be processed with 4 elongated slots 24, the guide 25 can be configured as a guide nail, and a threaded hole can be formed in the body 4 to screw the guide nail into the 4 elongated slots 24 of the closing sliding sleeve; in addition to such a structure, a protrusion integrally formed with the body 4 may be directly provided on the inner side of the body 4, which is not specifically limited in the present application.
In one embodiment, as shown in fig. 1, the body 4 has a step structure 26 on the inside of the upper end; the locating part includes top connection 27, locking piece 28, close cock seat 29 and spacing ring 30, the inboard threaded connection in upper end of the lower extreme outside and the body 4 of top connection 27, spacing ring 30 is fixed in 26 departments of stair structure and the lower extreme butt of the upper end of spacing ring 30 and top connection 27, the inboard lower extreme of top connection 27 and the inboard upper end of spacing ring 30 all are provided with inclined plane 31, locking piece 28 passes salvage subassembly and is connected with inclined plane 31 looks butt, close cock seat 29 and be fixed in the inboard of salvaging the subassembly and with the lateral surface looks butt of locking piece 28. The upper end of the fishing assembly is fixed at the upper end of the body 4 through the mutual matching of the inclined plane 31 on the inner side of the lower end of the upper joint 27, the inclined plane 31 on the inner side of the upper end of the limiting ring 30, the locking block 28 and the closing plug seat 29, and meanwhile, the sliding piece 5 and the fishing assembly are fixed well so that the sliding piece 5 can move along with the fishing assembly, and the effect that the circulation holes 7 in the body 4 and the circulation holes 7 in the sliding piece 5 are staggered is achieved. In particular, the closing plug seat 29 can be fixed inside the fishing assembly by means of shear pins; both ends of the upper joint 11 are processed with threads, the internal thread at the upper end can be conveniently connected with an on-site sleeve, and the external thread at the lower end is connected with the internal thread at the upper end of the body 4.
In one embodiment, as shown in fig. 1, the sealing element comprises an opening sliding sleeve 32 and an outer sliding sleeve 33, the upper end of the opening sliding sleeve 32 seals the circulation hole 7, the lower end of the opening sliding sleeve 32 abuts against the upper end of the outer sliding sleeve 33, the inner side of the outer sliding sleeve 33 below the overflowing hole 8 is recessed outwards to form the overflowing gap 10 communicated with the overflowing hole 8, the opening sliding sleeve 32 is connected with the body 4 through shear pins, and the outer sliding sleeve 33 is connected with the expansion assembly through shear pins. Under the action of pressure, the opening sliding sleeve 32 can be disconnected from the body 4 and moves downwards to expose the circulation hole 7, the opening sliding sleeve 32 can drive the outer sliding sleeve 33 to move downwards when moving downwards, and the outwards recessed part in the outer sliding sleeve 33 moves downwards until the inwards non-outwards recessed part in the outer sliding sleeve 33 is abutted against the end part of the overflowing hole 8 to close the overflowing hole 8. Specifically, the circulation hole 7 may be provided in plural, for example, 4.
In one embodiment, as shown in fig. 1, a position-limiting portion 34 is protruded from an outer side of the expansion assembly, a certain distance is provided between a lower end of the outer sliding sleeve 33 and the position-limiting portion 34, and the outer sliding sleeve 33 can move to a position where the lower end of the outer sliding sleeve 33 abuts against the position-limiting portion 34. Spacing portion 34 can be to the motion of opening sliding sleeve 32 and outer sliding sleeve 33 and do limiting displacement, opens sliding sleeve 32 and the common downstream of outer sliding sleeve 33, and when outer sliding sleeve 32 moved the position of its lower extreme and spacing portion 34 butt, discharge orifice 8 was sealed, and outer sliding sleeve 33 stopped downstream, and spacing portion 34 can avoid opening sliding sleeve 32 and outer sliding sleeve 33 and go out the slippage from the lower extreme of body 4.
In one embodiment, as shown in fig. 1, a stop 35 is fixed to the inside of the fishing assembly, and the stop 35 is located below the trigger 6, and the trigger 6 has a sealing state sealing the transfer passage 9 and a transfer state exposing the transfer passage 9 and abutting against the stop 35. When the trigger piece 6 does not reach a certain pressure value, the trigger piece 6 is in the sealed state of overflowing the channel 9 seal, high-pressure liquid can't get into the sealed chamber through overflowing the channel 9, when the trigger piece 6 reaches a certain pressure value, the trigger piece 6 is taken off and moves down from the inboard of salvaging the subassembly, until overflowing the channel 9 is exposed, allow high-pressure liquid to get into the sealed chamber through overflowing the channel 9, the trigger piece 6 stops moving down when moving down to the state with the stop part 35 butt, the stop part 35 can avoid the trigger piece 6 to go out from the lower extreme slippage of body 4.
In one embodiment, as shown in fig. 1, an annular boss structure 36 is protruded from the inner side of the lower end of the body 4, a first abutting surface 37 is formed at the upper end of the boss structure 36, a certain distance is provided between the lower end of the slider 5 and the first abutting surface 37, and the slider 5 can move to a position where the lower end of the slider 5 abuts against the first abutting surface 37. When the slider 5 moves downwards, the circulation holes 7 on the body 4 and the circulation holes 7 on the slider 5 can be staggered to close the passage between the inside and the outside of the body 4, when the lower end of the slider 5 moves to abut against the first abutting surface 37, the slider 5 stops moving, and the first abutting surface 37 can prevent the slider 5 from falling out of the body 4.
In one embodiment, as shown in fig. 1, the inner side of the body 4 is recessed to the outer side to form a ring-shaped groove structure 38, the first abutting surface 37 forms a lower end surface of the groove structure 38, and an upper end surface of the groove structure 38 is a second abutting surface 39; the anti-withdrawal snap spring 40 is sleeved on the outer side of the sliding member 5, and when the sliding member 5 moves to a position where the lower end of the sliding member 5 abuts against the first abutting surface 37, the anti-withdrawal snap spring 40 abuts against the second abutting surface 39. When the sliding part 5 moves to the position where the sliding part 5 abuts against the first abutting surface 37, the sliding part 5 is limited by two structures, the first abutting surface 37 limits the downward movement of the sliding part 5, the anti-withdrawing clamp spring 40 and the second abutting surface 39 limit the upward movement of the sliding part 5, and the sliding part 5 can be fixed at a certain position under the limiting action of the first abutting surface 37, the anti-withdrawing clamp spring 40 and the second abutting surface 39.
In one embodiment, as shown in fig. 1, soluble lower sealing boot 3 is fixed inside boss structure 36, and the boss structure 36, slider 5 and expansion assembly all have the same inside diameter. When the lower end of the sliding part 5 is abutted against the first abutting surface 37, the sliding part 5, the boss structure 36 and the expansion component have the same inner diameter, and after the soluble upper sealing sleeve 2 on the inner side of the sliding part 5 and the soluble lower sealing sleeve 3 on the inner side of the boss structure 36 are dissolved, a coherent inner wall with the same inner diameter is formed, so that the effect of being consistent with the inner diameter of the sleeve is achieved. Specifically, the soluble lower seal cartridge 3 is fitted from the inside of the lower end of the body 4 to the inside of the boss structure 36, and is screwed by the screw thread provided inside the boss structure 36.
In one embodiment, as shown in fig. 1, the fishing assembly includes a recyclable fishing core 41 and a lower sealing insertion tube 42, a lower end of the recyclable fishing core 41 is fixedly connected to an upper end of the lower sealing insertion tube 42, the recyclable fishing core 41 is provided with a recycling hole 7, and the lower sealing insertion tube 42 is provided with a flow passage 9.
In a specific embodiment, as shown in fig. 1, a sealing groove 43 is formed on the outer side of the recyclable inner core 41, the sealing grooves 43 are respectively located on two sides of the recycling hole 7, and a large-gap sealing ring is arranged in the sealing groove 43; the outer side of the lower sealing insertion pipe 42 is provided with a sealing groove 43, the sealing grooves 43 are respectively positioned at two sides of the overflowing channel 9, and a large-gap sealing ring is arranged in the sealing groove 43. The large-gap sealing rings in the sealing grooves 43 mainly seal the circulation holes 7 and the overflowing channels 9, so that the pressed liquid is prevented from flowing out from the two sides of the circulation holes 7 and the overflowing channels 9.
Specifically, as shown in the figures, the construction process is as follows:
before construction, the tool is firstly connected according to the design pipe string. The pipe string structure: guide shoes, a sleeve (sieve) pipe string 45, a salvage type drilling-plug-free cementing well completion tool 1, a sleeve string 45 and a wellhead.
First state as shown: a well head is thrown into a seat sealing ball 45, the seat sealing ball 45 is pumped to an inclined plane on the inner side of the trigger part 6 by starting a pump to form sealing, the sealing is continuously pressed to 5MPa, at the moment, a connecting structure ball seat shear pin 46 between the trigger part 6 and the lower sealing insertion pipe 42 is sheared, the trigger part 6 descends to expose the overflowing channel 9, high-pressure liquid enters the overflowing hole 8 on the body 4 through the overflowing channel 9, continues to pass through the overflowing gap 10, enters the joint channel 15 on the rubber sleeve joint 11 and finally enters the rubber sleeve assembly 13, the pressure expansion part 17 of the rubber sleeve assembly 13 starts to expand and finally clings to the inner wall of a well shaft, and the pressure expansion part 17 formed by expansion of the rubber sleeve assembly 13 divides the pipe string into an upper part and a lower part.
Second state as shown: and (3) continuously pressurizing to 10MPa, when the high-pressure liquid is gradually filled in the rubber cylinder assembly 13, and the pressure is gradually increased to a certain pressure (10MPa), the two sides of the rubber cylinder pressure limiting ring 20 are different in action area, the rubber cylinder closing shear pin 23 is sheared off, the rubber cylinder pressure limiting ring 20 moves upwards, the outer side of the rubber cylinder pressure limiting ring 20 and the inner side of the outer sliding sleeve 33 form sealing, and the expansion of the rubber cylinder is finished.
Third state as shown: continuing boosting, applying pressure to an action surface on the inner side of the opening sliding sleeve 32 through the circulation hole 7, opening a connecting structure between the sliding sleeve 32 and the body 4 and a connecting structure between the outer sliding sleeve 33 and the expansion assembly, namely shearing nails, and simultaneously opening the sliding sleeve 32 and the outer sliding sleeve 33 to descend, wherein the lower end of the outer sliding sleeve 33 is contacted with a limiting part 34 on the rubber sleeve joint 11, the inner side surface of the upper end of the outer sliding sleeve 33 is contacted with sealing rings 47 on the left side and the right side of the overflowing hole 8 to form sealing, and the overflowing hole 8 is permanently closed; meanwhile, the circulation hole 7 is exposed after the sliding sleeve 32 is opened to move downwards, and the pipe string is communicated internally and externally.
And (4) opening a pump at the wellhead for circulation, cleaning the shaft, preparing for cementing operation, and pumping calculated quantitative cement slurry into the wellhead.
Fourth state as shown: after the pumping, the displacement rubber plug 48 is thrown in, then the wellhead begins to pump the special plug pressing liquid 49, the displacement rubber plug 48 descends to the inclined plane on the inner side of the lower end of the closing plug seat 29 to form sealing, the pressure is increased to 6-7MPa, the connecting structure between the closing plug seat 29 and the recyclable salvage inner core 41, namely the shear pin, is sheared off, and the closing plug seat 29 and the displacement rubber plug 48 continue to descend to the upper end face of the trigger piece 6; the locking block 28 is released, the recyclable salvage inner core 41 pushes the sliding part 5 to move downwards through the soluble upper sealing sleeve 2 until the lower end face of the sliding part 5 is in contact with the first abutting face 37 on the inner side of the body 4, and the anti-withdrawal snap spring 40 expands to the second abutting face 39 on the inner side of the body 4, so that the limiting effect on the sliding part 5 is achieved. The circulation holes 7 in the slider 5 are displaced from the circulation holes 7 in the body 4, and the circulation holes 7 are closed.
Fifth state as shown: and (4) releasing the pressure at the wellhead, continuously putting in a special fishing tool, and fishing out the well bore from the fishing assembly, namely the recyclable fishing inner core 41 and the lower sealing insertion pipe 42.
Sixth state as shown: the soluble upper sealing sleeve 2 and the soluble lower sealing sleeve 3 in the tool start to react with the special plugging fluid 49 and gradually dissolve to finally form an inner diameter which is consistent with the inner diameter of the sleeve, and the construction is finished.
And after the fishing assembly is taken out, the threads between the recyclable fishing inner core 41 and the lower sealing insertion pipe 42 are removed after the recyclable fishing assembly returns to a factory, and the recyclable fishing inner core 41 is simply cleaned and inspected and then continues to be used as an assembly tool.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A salvage type drilling-plug-free cementing well completion device is characterized by comprising a well remaining part, a salvage assembly, a soluble upper sealing sleeve and a soluble lower sealing sleeve;
the well-reserving part comprises a body, a limiting part, a sliding part, a sealing part, an expansion component and a trigger part, the sliding part is slidably arranged on the inner side of the body, the fishing component is fixed on the inner side of the upper part of the body through the limiting part, the fishing component is fixed with the inner side of the sliding part, the soluble upper sealing sleeve is fixed on the inner side of the sliding part and positioned between the fishing component and the sliding part, the body, the sliding part, the soluble upper sealing sleeve and the fishing component are all provided with circulation holes, the circulation holes are oppositely arranged, the sealing part is sleeved on the outer side of the body, and the upper part of the sealing part is sleeved in the circulation holes and seals the circulation holes;
the inner side of the lower part of the body is fixedly provided with the soluble lower sealing sleeve, the outer side of the lower part of the fishing assembly is fixedly connected with the inner side of the soluble lower sealing sleeve, the body and the soluble lower sealing sleeve are both provided with overflowing holes which are oppositely arranged, the lower part of the fishing assembly is provided with an overflowing channel communicated with the overflowing holes, an overflowing gap communicated with the overflowing holes is formed between the lower part of the sealing element and the body, and the overflowing gap is communicated with the inside of the expansion assembly;
the trigger piece is fixed in the inboard of fishing subassembly and will overflow the passageway and seal.
2. The salvage drill-free cementing completion device according to claim 1, the expansion component comprises a rubber cylinder joint, a central pipe, a rubber cylinder assembly and a lower joint, the upper end of the rubber cylinder joint is fixedly connected with the sealing element and the body, the inner side of the lower end of the rubber cylinder joint is in threaded connection with the central pipe, the outer side of the lower end of the rubber cylinder joint is in threaded connection with the rubber cylinder assembly, the inner side of the upper end of the lower joint is in threaded connection with the outer side of the lower end of the central tube, the outer side of the upper end of the lower joint is in threaded connection with the inner side of the lower end of the rubber cylinder assembly, a sealing cavity is formed among the rubber cylinder joint, the central pipe, the rubber cylinder assembly and the lower joint, the rubber barrel joint is internally provided with a joint channel, and two ends of the joint channel are respectively communicated with the sealing cavity and the overflowing gap.
3. The salvage type drilling-plug-free cementing completion device according to claim 2, wherein two ends of the rubber sleeve assembly are metal pieces with internal threads, the middle part of the rubber sleeve assembly is a pressure expansion part, and two sides of the pressure expansion part are fixed on the metal pieces.
4. The overshot drill-plug-free cementing completion device according to claim 1, wherein the flow-through gap comprises an enlarged section proximal to the expansion assembly and a reduced section distal to the expansion assembly; the overflowing gap is sealed by a rubber barrel pressure limiting ring, the rubber barrel pressure limiting ring is provided with an expansion end and a reduction end which are opposite, the expansion end is located in the expansion section, the reduction end is located in the reduction section, the rubber barrel pressure limiting ring is fixedly connected with the body through a rubber barrel closing shear pin, and the rubber barrel pressure limiting ring can move to the position where the outer side of the rubber barrel pressure limiting ring abuts against the inner side of the sealing piece.
5. The salvage type drilling-plug-free cementing completion device according to claim 1, wherein the sliding member is provided as a closing sliding sleeve, an elongated groove is arranged on the outer side of the closing sliding sleeve, and a guide member is convexly arranged on the inner side of the body and extends into the elongated groove so that the closing sliding sleeve can move up and down relative to the body.
6. The salvage drill-free cementing completion device according to claim 1, wherein the upper end of the body has a stepped structure inside; the locating part includes top connection, locking piece, closes chock and spacing ring, the lower extreme outside of top connection with the inboard threaded connection in upper end of body, the spacing ring is fixed in stair structure department just the upper end of spacing ring with the lower extreme butt of top connection, the lower extreme inboard of top connection with the upper end inboard of spacing ring all is provided with the inclined plane, the locking piece passes salvage the subassembly and with inclined plane looks butt, close the chock be fixed in salvage the subassembly inboard and with the lateral surface looks butt of locking piece.
7. The salvage drilling-plug-free cementing completion device according to claim 1, wherein the sealing element comprises an opening slide sleeve and an outer slide sleeve, the upper end of the opening slide sleeve seals the circulation hole, the lower end of the opening slide sleeve abuts against the upper end of the outer slide sleeve, the inner side of the outer slide sleeve below the overflowing hole is recessed outwards to form the overflowing gap communicated with the overflowing hole, the opening slide sleeve is connected with the body through shear pins, and the outer slide sleeve is connected with the expansion assembly through shear pins.
8. The salvage type drilling-plug-free cementing completion device according to claim 7, wherein a limiting part is convexly arranged on the outer side of the expansion assembly, a certain distance is reserved between the lower end of the outer sliding sleeve and the limiting part, and the outer sliding sleeve can move to a position where the lower end of the outer sliding sleeve is abutted against the limiting part.
9. The salvage drill-plug-free cementing completion device according to claim 1, wherein a stop member is fixed to the inside of the fishing assembly and is located below the trigger member, the trigger member having a sealing state sealing the flow passage and an overflow state exposing the flow passage and abutting the stop member.
10. The salvage type drilling-plug-free cementing completion device according to claim 1, wherein an annular boss structure is convexly arranged on the inner side of the lower end of the body, a first abutting surface is formed at the upper end of the boss structure, a certain distance is reserved between the lower end of the sliding piece and the first abutting surface, and the sliding piece can move to a position where the lower end of the sliding piece abuts against the first abutting surface.
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| CN202011035585.2A CN112177565B (en) | 2020-09-27 | 2020-09-27 | Salvaging type drilling-plug-free cementing well completion device |
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| CN202011035585.2A CN112177565B (en) | 2020-09-27 | 2020-09-27 | Salvaging type drilling-plug-free cementing well completion device |
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| CN112177565A true CN112177565A (en) | 2021-01-05 |
| CN112177565B CN112177565B (en) | 2021-05-14 |
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