CN114482959B - Full-drift diameter infinite-stage fracturing completion assembly and process method thereof - Google Patents
Full-drift diameter infinite-stage fracturing completion assembly and process method thereof Download PDFInfo
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- CN114482959B CN114482959B CN202011151531.2A CN202011151531A CN114482959B CN 114482959 B CN114482959 B CN 114482959B CN 202011151531 A CN202011151531 A CN 202011151531A CN 114482959 B CN114482959 B CN 114482959B
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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Abstract
本发明公开了一种全通径无限级压裂完井组件及其工艺方法，包括压裂完井滑套和用于开启压裂完井滑套的打开工具，二者通过特定的滑块与凹槽的配合结构，具有多种序列组合，保证分段压裂级数不受限制；开启方式既可实现任意定点压裂完井滑套的一匙一开，也可实现一级多簇压裂完井滑套的一匙多开；压后，打开工具可全部溶解，实现完井管柱全通径；满足连续快速、大规模、多级多簇的压裂完井施工需求，提高压裂效率。
The invention discloses a full-bore unlimited-stage fracturing completion assembly and a process method thereof, comprising a fracturing completion sleeve and an opening tool for opening the fracturing completion sleeve. The two have a plurality of sequence combinations through a matching structure of a specific slider and a groove, thereby ensuring that the number of staged fracturing stages is not limited. The opening method can realize one-spoon-one-opening of any fixed-point fracturing completion sleeve, and can also realize one-spoon-multiple-opening of one-stage multi-cluster fracturing completion sleeves. After fracturing, the opening tool can be completely dissolved to realize the full-bore of the completion string. The requirements for continuous, rapid, large-scale, multi-stage and multi-cluster fracturing completion construction are met, and the fracturing efficiency is improved.
Description
Technical Field
The invention relates to a fracturing completion assembly of an oil-water well in the petroleum industry, in particular to a full-drift diameter infinite-stage fracturing completion assembly and a process method thereof.
Background
Currently, the fracturing completion technology for low-permeability and dense oil reservoirs at home and abroad mainly comprises an open hole multistage staged fracturing completion technology and a sleeve cementing multistage staged fracturing completion technology. The main stream technology covers the modes of ball-throwing sliding sleeve type multistage staged fracturing well completion, pumping bridge plug type multistage staged fracturing well completion and the like.
The ball-throwing sliding sleeve type multistage staged fracturing well completion technology is applied to open hole fracturing well completion or casing well cementation fracturing well completion, balls with different grades and ball seats are combined, and the staged fracturing is completed by delivering the balls with different grades to open the fracturing well completion sliding sleeve with corresponding grades. The technology is influenced by the sizes of ball seats arranged in a grading way, the number of the segments and the fracturing scale are greatly limited, the transformation effect is influenced, the grinding ball seats need to be drilled in later production to form the full-diameter ball seat, and the operation cost is high. The multistage staged fracturing well completion technology of the pumping bridge plug is applied to casing well cementation fracturing well completion, and has no limitation on staged number, but the perforation fracturing combined process cannot keep the continuity of fracturing, has long operation period, needs to drill plugs after the operation is completed, has high operation cost, and cannot carry out selective production or secondary fracturing in the later period.
In recent years, various fracturing completion techniques for opening a fracturing sliding sleeve in a delivery manner have been developed successively by large oil companies. For example, chinese patent CN103556971B "full-drift diameter layered fracturing sliding sleeve for oil-gas well operation" granted by 3 months and 2 days in 2016 discloses a novel ball-throwing sliding sleeve comprising a step-type moving mechanism, the sliding sleeve technology can realize the function of sequentially throwing balls with the same size to gradually open the sliding sleeve, in principle, unlimited series and keeping the full-drift diameter of all sliding sleeves can be realized, but the sliding sleeve has sand blocking risks in actual use, so that the sliding sleeve cannot be normally opened to lose a fracturing layer section, in addition, because the structure of the sliding sleeve does not involve a sealing mechanism, the fracturing construction is easy to generate up-down blowby, and the starting balls in the later stage process still need to be discharged back, so the working procedure is complex.
In addition, in a Chinese patent application CN110905448A published on 24 months in 2020, an infinitely graded full-bore fracturing sliding sleeve assembly system is disclosed, which comprises a plurality of sub-fracturing sliding sleeves which are connected in series through pipelines and are in one-to-one correspondence with a plurality of opening mechanisms, the system can realize that after all layers of layer fracturing is completed, the whole pipe column is the full-bore without drilling operation, thus being beneficial to later production management, infinite stages can be realized through series connection of the multistage sliding sleeves, but a positioning elastic piece of the opening mechanism in the fracturing sliding sleeve system is easy to generate plastic deformation in the process of excessively multistage fracturing sliding sleeve, so that the opening failure is caused, the fracturing layer is lost, and meanwhile, a positioning groove is an annular gap between an upper joint and an inner sleeve, and selective switching cannot be performed in the later stage.
Therefore, there is an urgent need for a full-bore infinite stage fracturing completion assembly that can be implemented in horizontal wells, vertical and inclined wells, etc., in an infinite number of stages, in multiple clusters, in a large scale, continuously and rapidly, and that can achieve selective opening or closing of any sliding sleeve in the later stage as desired.
Disclosure of Invention
The invention aims to provide a full-drift diameter infinite-stage fracturing completion assembly aiming at the defects in the prior art. The opening tool can be matched with the fracturing completion sliding sleeve one by one, so that the fracturing completion construction requirements of full-diameter, unlimited, continuous, rapid, multistage and multi-cluster are met, and the fracturing efficiency is improved.
The invention also provides a process method using the fracturing completion assembly.
The technical scheme of the invention is that the full-drift infinite-stage fracturing completion assembly comprises a fracturing completion sliding sleeve and an opening tool for opening the fracturing completion sliding sleeve, wherein the fracturing completion sliding sleeve comprises:
The outer sleeve is provided with a plurality of sand blasting holes communicated with the inner cavity, and is provided with a plurality of positioning grooves;
The inner sleeve is arranged on the inner wall of the outer sleeve in a sliding manner and is connected with the outer sleeve through a shearing pin, the outer wall of the inner sleeve is used for sealing the sand spraying hole, a positioning piece matched with a positioning groove is movably arranged on the outer surface of the inner sleeve, a first sealing piece is further arranged between the outer sleeve and the inner sleeve, an opening groove and a closing groove are respectively arranged on the inner wall of the inner sleeve, the opening groove is matched with an opening tool, an inner sleeve accommodating cavity for opening the sand spraying hole when the inner sleeve moves is arranged in the outer sleeve, and one positioning groove is positioned in the inner sleeve accommodating cavity;
The sliding sleeve lower joint is in threaded connection with the lower end of the outer sleeve, and the upper end of the sliding sleeve lower joint is provided with a guide slope.
Preferably, the opening tool includes:
The outer surface of the tool upper joint is provided with a second sealing piece used for sealing with the inner wall of the inner sliding sleeve, and the upper end of the tool upper joint is provided with a soluble ball used for sealing the inner cavity;
The central tube is in threaded connection with the upper connector of the tool, the outer wall of the central tube is movably provided with an opening sliding block matched with the opening groove, and a spring for radially extending and retracting the opening sliding block is arranged between the central tube and the opening sliding block;
and the tool lower connector is arranged at the lower end of the central tube.
Preferably, the opening grooves are multiple and are spirally distributed at the lower part of the inner sliding sleeve at 360 degrees, the opening grooves and the axis of the inner sliding sleeve are provided with an inclined angle alpha, and the inclined angle alpha is 0-60 degrees.
The opening groove comprises a guide opening and a sliding block groove connected with the guide opening, the opening sliding block is matched with the opening groove, a limiting groove used for radially limiting the opening sliding block is formed between the tool lower joint and the tool upper joint and between the tool lower joint and the central tube, inclined surfaces are respectively arranged at the upper end and the lower end of the opening sliding block, and the inclined surfaces at the lower end of the opening sliding block are matched with the guide slope of the sliding sleeve lower joint.
Preferably, the opening groove comprises a guide opening, a sliding block groove connected with the guide opening and a guide groove connected with the lower end of the sliding block groove, the tool lower joint is connected with the central tube through a connecting piece, a limit groove used for radially limiting the opening sliding block is formed between the connecting piece and the tool upper joint and between the connecting piece and the central tube, a pressing cap is arranged between the connecting piece and the tool lower joint, and a plurality of guide keys extending out of the outer surface of the pressing cap are arranged on the pressing cap and are matched with the guide groove.
Preferably, the guide key is an elastic guide key.
Preferably, the first sealing elements are a plurality of, and the first sealing elements are rubber sealing rings and are respectively arranged among the sand spraying holes, the shearing pins and the positioning elements.
Preferably, the number of springs between each opening slide block and the central tube is 2-6, and a telescopic space for the opening slide blocks to stretch is arranged between the opening slide blocks and the central tube.
Preferably, the positioning member is an elastic positioning member, and the opening tool is made of a dissolvable metal material.
The invention provides a process method of a first full-drift diameter infinite-stage fracturing completion assembly, which comprises the following steps of:
1) Delivering an opening tool into the frac completion sleeve by pumping;
2) When the opening tool is not matched with the fracturing well completion sliding sleeve, namely the shape and the size of the opening sliding block are not matched with those of the opening groove, the opening action cannot be realized, and at the moment, the opening sliding block is always in a compressed state and passes through the non-matched sliding sleeve until entering the corresponding matched sliding sleeve;
3) When the opening tool is matched with the fracturing well completion sliding sleeve, the opening sliding block is in a compressed state when the opening sliding block does not enter the opening groove, and when the opening sliding block enters the opening groove, the shape and the size of the opening sliding block of the opening tool are completely matched with those of the opening sliding block, and the opening sliding block is in a free state and is locked with the opening sliding block;
4) When the sleeve is pressed to a preset pressure under the action of hydraulic pressure, a shearing pin on the fracturing completion sliding sleeve is sheared, the opening tool drives the inner sliding sleeve to move downwards, the positioning piece climbs out of the positioning groove and is in a compressed state, and the inner sliding sleeve continuously moves downwards into the next positioning groove to be in a free state;
5) When the casing is continuously pressed, the opening tool drives the inner sliding sleeve to continuously move downwards, the tool lower joint slides to the left end part of the sliding sleeve lower joint of the fracturing completion sliding sleeve and continuously moves downwards, the tool lower joint enters the inside of the sliding sleeve lower joint, at the moment, the inclined surface at the right end of the opening sliding block is contacted with the guide slope surface at the left end of the sliding sleeve lower joint and is extruded, the opening sliding block climbs out of the opening groove under the action of casing pumping pressure, the opening tool is gradually separated from the inner sliding sleeve, the inner sliding sleeve is positioned in an inner sliding sleeve accommodating cavity and does not move downwards any more, a certain stroke allowance is arranged at a positioning groove at the lower part of the outer sleeve, and a positioning piece cannot climb out of the positioning groove;
6) The opening tool continuously descends under the action of hydraulic pressure and enters the next cluster of the fracturing completion sliding sleeve matched with the opening tool, the corresponding fracturing completion sliding sleeve matched with the opening tool is completely opened, a fracturing channel is established until the opening tool enters the last cluster of the fracturing completion sliding sleeve matched with the opening tool to complete the action of opening the inner sliding sleeve, and then the opening tool is locked with the inner sliding sleeve and does not descend any more, and at the moment, the 'one-key multi-opening' action of all the first-stage multi-cluster fracturing completion sliding sleeves is completed;
7) After the fracturing, the opening tools can be completely dissolved to form a full-drift-diameter fracturing completion shaft, a special hydraulic control closing tool can be selected for selectively closing the fracturing completion sliding sleeve according to production requirements, if the fracturing completion sliding sleeve needs to be opened again at fixed points, the opening tools matched with the fixed-point fracturing completion sliding sleeve can be selected, and the actions of 1) -6) are repeated to finish the opening.
The invention provides a process method of a second full-drift diameter infinite-stage fracturing completion assembly, which comprises the following steps of:
1) Delivering an opening tool into the frac completion sleeve by pumping;
2) When the opening tool is not matched with the fracturing completion sliding sleeve, namely the opening sliding block and the guide key are not matched with the opening groove in shape and size, the opening action cannot be realized, and at the moment, the opening sliding block and the guide key are always in a compressed state and pass through the unmatched sliding sleeve until entering the corresponding matched sliding sleeve;
3) When the shapes and the sizes of the opening slide block and the guide key are completely matched with those of the slide block groove and the guide groove respectively, the opening slide block and the guide key are in a compressed state when the opening slide block and the guide key do not enter the opening groove, and when the opening slide block and the guide key enter the slide block groove and the guide groove respectively, the opening slide block and the guide key are in a free state and are locked with the opening groove, at the moment, the inner cavity of the tool is sealed and opened by the soluble ball, the second sealing piece and the inner sliding sleeve are in an interference sealing state, and the inner channel of the inner sliding sleeve is completely sealed;
4) When the sleeve is pressed to a preset pressure under the action of hydraulic pressure, a shearing pin on the fracturing completion sliding sleeve is sheared, the opening tool drives the inner sliding sleeve to move downwards, the positioning piece climbs out of the positioning groove and is in a compressed state, and the positioning piece and the inner sliding sleeve continuously move downwards into the next positioning groove to be in a free state, so far, the inner sliding sleeve and the opening tool are locked and are positioned in an inner sliding sleeve accommodating cavity to be opened in place, the inner sliding sleeve does not move downwards any more, the sand blasting hole is exposed, the fracturing completion sliding sleeve is in a complete opening state, a fracturing channel is established, and the 'one key one opening' action of opening the fracturing completion sliding sleeve at any fixed point is completed;
5) After the fracturing, the opening tools can be completely dissolved to form a full-drift-diameter fracturing completion shaft, a special hydraulic control closing tool can be selected for selectively closing the fracturing completion sliding sleeve according to production requirements, if the fracturing completion sliding sleeve needs to be opened again at fixed points, the opening tools matched with the fixed-point fracturing completion sliding sleeve can be selected, and the opening is completed by repeating the actions of 1) -4).
Compared with the prior art, the invention has the following advantages:
(1) The cooperation between the fracturing completion sliding sleeve and the sliding block of the opening tool in the full-drift diameter infinite-level fracturing completion assembly is unique, and any fixed-point opening can be realized;
(2) The cooperation of the sliding blocks and the grooves of the fracturing completion sliding sleeve and the opening tool has various sequence combinations, so that the staged fracturing stage number is not limited;
(3) The fracturing completion sliding sleeve is designed into an equal-diameter design, has no step difference, is not limited in fracturing step number, and meets the requirements of large-displacement and large-scale fracturing construction;
(4) The fracturing completion sliding sleeve is matched with the opening tool one by one, so that one key can be used for opening one, one key can be used for opening more, the continuous, rapid, multistage and multi-cluster fracturing construction requirements are met, and the fracturing efficiency is improved;
(5) The opening tool in the assembly can be dissolved after being pressed, so that the full diameter of the well completion sliding sleeve is ensured, drilling and fishing are not needed, and the process is simple, safe and reliable;
(6) After the fracturing, any fracturing well completion sliding sleeve can be selectively closed through a special hydraulic control switch tool, so that the requirements of selective water control production or secondary fracturing construction are met.
Drawings
FIG. 1 is a schematic illustration of a fracturing completion sliding sleeve configuration of a full-path infinite stage fracturing completion assembly;
FIG. 1a is a schematic view showing the deployment of an opening groove according to the second embodiment;
FIG. 1b is an enlarged partial schematic view of FIG. 1 a;
FIG. 1a' is a schematic view of an opening recess deployment of the first embodiment;
FIG. 1b 'is an enlarged partial schematic view of FIG. 1 a';
FIG. 2 is a schematic illustration of an open tool configuration corresponding to FIG. 1a in a full-path infinite stage fracturing completion assembly;
FIG. 2 'is a schematic illustration of an open tool configuration corresponding to FIG. 1a' in a full-path infinite stage fracturing completion assembly;
FIG. 2a is a schematic top view of the opening slider of FIGS. 2, 2';
FIG. 2b is a schematic top view of the guide key of FIG. 2;
FIG. 3 is a state diagram of an open tool mated with a frac completion slip without the sand blast open;
FIG. 3a is a state diagram of an opening tool in cooperation with a frac completion slip to open a sand blast;
3-1 parts of a jacket, 3-2 parts of a closing groove, 3-3 parts of an inner sliding sleeve, 3-4 parts of a sand spraying hole, 3-5 parts of a shearing pin, 3-6 parts of a positioning piece, 3-7 parts of an opening groove, 3-8 parts of a positioning groove, 3-9 parts of a first sealing piece, 3-10 parts of a sliding sleeve lower joint, 3-11 parts of a sliding block groove, 3-12 parts of a guiding groove, 3-13 parts of a guiding opening, 13-1 parts of a soluble ball, 13-2 parts of a tool upper joint, 13-3 parts of a second sealing piece, 13-4 parts of a central tube, 13-5 parts of a spring, 13-6 parts of an opening sliding block, 13-7 parts of a connecting piece, 13-8 parts of a guiding key, 13-9 parts of a tool lower joint, 13-10 parts of a pressing cap.
Detailed Description
The invention is further illustrated by the following examples in connection with the accompanying drawings.
Example 1
Referring to fig. 1, 1a ', 1b', 2a, 3 and 3a, a full-path infinite stage fracturing completion assembly is shown that includes a fracturing completion sleeve and an opening tool for opening the fracturing completion sleeve. The fracturing well completion sliding sleeve comprises a fixed outer sleeve 3-1 and an inner sliding sleeve 3-3 connected to the inner wall of the outer sleeve 3-1 through a shearing pin 3-5, and a positioning piece 3-6 is further arranged between the outer sleeve 3-1 and the inner sliding sleeve 3-3. Wherein, the coat 3-1 is provided with sand blasting holes 3-4 (6-10 evenly distributed) and 2 positioning grooves 3-8 communicated with the inner cavity, the upper part of the inner sliding sleeve 3-3 is provided with a closing groove 3-2, the lower part is provided with an opening groove 3-7, and the middle is provided with a plurality of sealing elements 3-9. The outer sleeve 3-1 is connected with the sliding sleeve lower joint 3-10 through threads. The positioning piece 3-6 is an elastic body (which can be an elastic sheet or an elastic ring) and is embedded into the positioning groove 3-8.
When the outer sleeve 3-1 and the inner sleeve 3-3 are connected together through the shear pin 3-5, the outer wall of the inner sleeve 3-3 is used for sealing the sand spraying holes 3-4, and the sand spraying holes 3-4 are in a sealing state.
A plurality of first sealing elements 3-9 are also arranged between the outer sleeve 3-1 and the inner sleeve 3-3, and the inner sleeve 3-3 can be in a sealing state when sliding relative to the outer sleeve 3-1 through the first sealing elements 3-9.
The upper end of the sliding sleeve lower joint 3-10 is provided with a guide slope, the outer sleeve 3-1 is internally provided with an inner sliding sleeve accommodating cavity for opening the sand spraying hole 3-4 when the inner sliding sleeve 3-3 moves, and one of the positioning grooves 3-8 is positioned in the inner sliding sleeve accommodating cavity. After shearing the shearing pin 3-5, the inner sliding sleeve 3-3 moves down into the inner sliding sleeve accommodating cavity and enters the positioning groove 3-8 in the inner sliding sleeve accommodating cavity through the positioning piece 3-6 to be positioned, and the sand spraying hole 3-4 is in an open state.
The opening tool comprises a soluble ball 13-1, an upper tool joint 13-2, a second sealing member 13-3, a central tube 13-4, a spring 13-5, an opening slide 13-6 and a lower tool joint 13-9.
Wherein the second sealing member 13-3 is provided on the outer surface of the tool upper joint 13-2, and the upper end of the tool upper joint 13-2 is provided with a soluble ball 13-1 for sealing the inner cavity.
The central tube 13-4 is in threaded connection with the upper tool joint 13-2, the outer wall of the central tube 13-4 is movably provided with an opening slide block 13-6 matched with the opening groove 3-7, the outer wall of the central tube 13-4 is also provided with a spring 13-5 for radially expanding and contracting the opening slide block 13-6, the upper end of the lower tool joint 13-9 is in threaded connection with the lower end of the central tube 13-4, and the lower end of the upper tool joint 13-2, the lower tool joint 13-9 and the outer surface of the central tube 13-4 form a limiting groove for radially limiting the opening slide block 13-6. The opening groove 3-7 comprises a guide opening 3-13 and a slide block groove 3-11 connected with the guide opening 3-13, the opening slide block 13-6 is matched with the slide block groove 3-11, when an opening tool is completely matched with the fracturing completion slide sleeve, the opening slide block 13-6 is guided into the slide block groove 3-11 through the guide opening 3-13, the upper end and the lower end of the opening slide block 13-6 are respectively provided with an inclined surface, the inclined surface at the lower end of the opening slide block 13-6 is matched with the guide slope of the lower joint 3-10 of the slide sleeve, so that the opening slide block 13-6 is separated from the slide block groove 3-11, and the opening tool enters the fracturing completion slide sleeve which is completely matched with the next cluster to complete the same opening slide sleeve step, and realize one-key multi-opening action.
The technological method specifically comprises the following steps of delivering an opening tool when carrying out fracturing construction, and pumping into a fracturing completion sliding sleeve in an initial state (the initial state is a state that an inner sliding sleeve 3-3 closes a sand spraying hole 3-4).
① When the opening tool is not matched with the fracturing completion sliding sleeve, namely the shape and the size of the opening sliding block 13-6 are not matched with those of the opening groove 3-7, the opening action cannot be realized, and at this time, the opening sliding block 13-6 is always in a compressed state and passes through the unmatched sliding sleeve until entering the corresponding matched sliding sleeve.
② When the opening tool is matched with the fracturing completion sliding sleeve, the opening slide block 13-6 is in a compressed state when the opening slide block does not enter the opening groove 3-7, and when the opening slide block enters the opening groove 3-7, the shape and the size of the opening slide block 3-7 are completely matched with those of the opening slide block 13-6 of the opening tool, and the opening slide block 13-6 is in a free state and is locked with the slide block groove 3-11. At the moment, the inner cavity of the tool is sealed and opened by the soluble ball 13-1, the second sealing piece 13-3 and the inner sliding sleeve 3-3 are in an interference sealing state, the inner channel of the inner sliding sleeve 3-3 is completely sealed, when the inner sleeve is pressed to a preset pressure under the action of hydraulic pressure, the shearing pin 3-5 on the fracturing completion sliding sleeve is sheared, the inner sliding sleeve 3-3 is driven to move downwards by the opening tool, the positioning piece 3-6 climbs out of the positioning groove 3-8, and is in a compression state and the inner sliding sleeve 3-3 continuously moves downwards into the next positioning groove 3-8, so that the positioning piece is in a free state. So far, the inner sliding sleeve 3-3 is opened in place, the sand spraying holes 3-4 are exposed, the fracturing well completion sliding sleeve is in a complete opening state, and a fracturing channel is established. At the moment, the sand blasting holes 3-4 are provided with flow limiting valves, the sand blasting holes are in a flow limiting state, under a certain pumping displacement, enough pressure still exists in the sleeve to push the opening tool to enter the next cluster of fracturing completion sliding sleeve, when all the multiple clusters of fracturing completion sliding sleeves are opened to prepare for fracturing, the fracturing displacement is increased to a preset index, the flow limiting valves on the sand blasting holes 3-4 can be completely opened, and smooth liquid feeding of fracturing construction is ensured.
③ When the casing is continuously pressed, the opening tool drives the inner sliding sleeve to continuously move downwards, the tool lower joint 13-9 slides to the left end part of the sliding sleeve lower joint 3-10 of the fracturing completion sliding sleeve and continuously moves downwards to enter the inside of the sliding sleeve lower joint 3-10, at the moment, the right end inclined surface of the opening sliding block 13-6 contacts with the guide slope surface of the left end of the sliding sleeve lower joint 3-10 and is extruded, under the action of casing pumping pressure, the opening sliding block 13-6 climbs out of the sliding block groove 3-11, the opening tool is gradually separated from the inner sliding sleeve 3-3, the inner sliding sleeve 3-3 is positioned in an inner sliding sleeve accommodating cavity and does not move downwards any more, a certain stroke allowance is arranged at the positioning groove 3-8 at the lower part of the outer sleeve 3-1, and the positioning piece 3-6 cannot climb out of the positioning groove 3-8.
④ The opening tool continues to descend under the hydraulic action and enters the next cluster of the fracturing completion sliding sleeve matched with the opening tool, the corresponding fracturing completion sliding sleeve matched with the opening tool continues to carry out ②、③ actions, a fracturing channel is established until the opening tool enters the last cluster of the fracturing completion sliding sleeve matched with the opening tool to complete the action of opening the inner sliding sleeve 3-3, and then the opening tool is locked with the inner sliding sleeve 3-3 and does not descend any more, and at the moment, the 'one-key multi-opening' action of all the first-stage multi-cluster fracturing completion sliding sleeves is completed.
The parameters C, D and alpha on the opening groove 3-7 on the fracturing completion sliding sleeve and the parameters C ', D' and alpha 'on the opening sliding block 13-6 of the opening tool are matched in a one-to-one correspondence mode, so that the opening action of the inner sliding sleeve 3-3 can be realized, and the parameters C', D 'and alpha' on the opening tool can be matched with the parameters C, D and alpha on a plurality of identical fracturing completion sliding sleeves.
The parameters C, D and alpha on the multiple identical fracturing completion sliding sleeves in the invention should be set so that all parameters of the sliding sleeves can identify all parameters of C ', D ', alpha ' on the corresponding opening tools which are matched with the sliding sleeves one by one. When the opening grooves 3-7 on the plurality of fracturing completion sliding sleeves are completely matched with the opening tool structures, the opening sliding blocks 13-6 can be extruded into the opening grooves 3-7 on the plurality of fracturing completion sliding sleeves under the action of elasticity, so that two corresponding tools are combined together to complete the opening action, and the multi-cluster fracturing completion sliding sleeves can be opened at any fixed point. Therefore, the operation action of one-key multi-opening of the first-stage multi-cluster fracturing well completion sliding sleeve is realized. When the multi-stage multi-cluster is multi-stage staged fracturing, a plurality of fracturing completion sliding sleeves with identical parameters are arranged in one stage.
The parameters C, D and alpha on the identical fracturing completion sliding sleeves and the parameters C ', D ' and alpha ' on the corresponding opening tools can be correspondingly and randomly changed and combined, and the full-drift diameter infinite-level fracturing completion sliding sleeve combination with one key and multiple openings can be realized as long as the parameters can be completely matched.
Example two
As a preferred embodiment, shown with reference to fig. 1, 1a, 1b, 2a and 2b, substantially the same as the first embodiment is different in that the opening recess 3-7 includes a guide opening 3-13, a slider recess 3-11 and a guide recess 3-12. Wherein, the guiding opening 3-13 is tapered and is connected with the sliding block groove 3-11 and the guiding groove 3-12, the sliding block groove 3-11 is matched with the opening sliding block 13-6, and the guiding groove 3-12 is matched with the guiding key 13-8. A connecting piece 13-7 is arranged between the tool lower joint 13-9 and the central tube 13-4, and a limiting groove for radially limiting the opening slide block 13-6 is formed between the connecting piece 13-7 and the tool upper joint 13-2 and between the connecting piece 13-7 and the central tube 13-4. A pressing cap 13-10 is arranged between the connecting piece 13-7 and the tool lower joint 13-9, a plurality of guide keys 13-8 extending out of the outer surface of the pressing cap 13-10 are arranged on the pressing cap 13-10, the guide keys 13-8 are elastic guide keys, and the guide keys 13-8 are matched with the guide grooves 3-12. In summary, the shape and size of the opening recess 3-7 is exactly matched to the shape and size of the opening slider 13-6 and the guide key 13-8.
When the fracturing construction is performed, an opening tool is delivered, and the fracturing completion sliding sleeve is brought into an initial state (the initial state is a state in which the inner sliding sleeve 3-3 closes the sand blasting holes 3-4) by pumping.
① When the opening tool is not matched with the fracturing completion sliding sleeve, namely the shape and the size of the opening slide block 13-6 and the guide key 13-8 are not matched with the shape and the size of the slide block groove 3-11 and the guide groove 3-12 respectively, the opening action cannot be realized, and at the moment, the opening slide block 13-6 and the guide key 13-8 are always in a compressed state and pass through the unmatched sliding sleeve until the corresponding matched sliding sleeve is entered.
② When the opening tool is matched with the fracturing completion sliding sleeve, the opening slide block 13-6 and the guide key 13-8 are in a compressed state when the opening slide block does not enter the opening groove 3-7, and when the opening slide block enters the opening groove 3-7, the shapes and the sizes of the slide block groove 3-11 and the guide groove 3-12 are completely matched with those of the opening slide block 13-6 and the guide key 13-8 of the opening tool, and the opening slide block 13-6 and the guide key 13-8 are in a free state and are locked with the slide block groove 3-11 and the guide groove 3-12. At the moment, the inner cavity of the tool is sealed and opened by the soluble ball 13-1, the second sealing piece 13-3 and the inner sliding sleeve 3-3 are in an interference sealing state, the inner channel of the inner sliding sleeve 3-3 is completely sealed, when the casing is pressed to a preset pressure under the action of hydraulic pressure, the shearing pin 3-5 on the fracturing completion sliding sleeve is sheared, the inner sliding sleeve 3-3 is driven to move downwards by the opening tool, the positioning piece 3-6 climbs out of the positioning groove 3-8 and is in a compression state, and the positioning piece and the inner sliding sleeve 3-3 continuously move downwards into the next positioning groove 3-8 to be in a free state. So far, the inner sliding sleeve 3-3 is locked with the opening tool and is positioned in the accommodating cavity of the inner sliding sleeve to be opened in place, the inner sliding sleeve is not descended any more, the sand blasting hole 3-4 is exposed, the fracturing well completion sliding sleeve is in a completely opened state, a fracturing channel is established, and the 'one-key one-opening' action of opening the fracturing well completion sliding sleeve at any fixed point is completed.
The parameters A, B, C, D and alpha on the opening groove 3-7 on the fracturing completion sliding sleeve are in one-to-one correspondence with the parameters A ', B ', alpha ' on the guiding key 13-8 of the opening tool and the parameters C ', D ', alpha ' on the opening sliding block 13-6, so that the opening action of the inner sliding sleeve 3-3 can be realized, and the parameters A, B, C, D and alpha on each fracturing completion sliding sleeve can be only matched with one single parameter, namely the parameters A ', B ', C ', D ', alpha ' on the opening tool.
The A, B, C, D, alpha parameters on the fracturing completion sleeve of the present invention should be set so that all parameters of the sleeve identify all parameters a ', B ', C ', D ', alpha ' on the corresponding opening tool that uniquely mates with the sleeve. When the opening groove 3-7 on one fracturing completion sliding sleeve is completely matched with the opening tool structure, the opening sliding block 13-6 and the guide key 13-8 can be extruded into the opening groove 3-7 under the action of elasticity, so that two corresponding tools are combined together to complete the opening action, and the fracturing completion sliding sleeve can be opened only at any fixed point. Thus realizing the operation action of 'one key and one open'.
The parameters A, B, C, D and alpha on the fracturing completion sliding sleeve and the parameters A ', B ', C ', D ' and alpha ' on the corresponding opening tool can be changed and combined randomly in a one-to-one correspondence manner, and the full-drift diameter infinite-stage fracturing completion sliding sleeve combination with one key and one opening can be realized only by complete matching.
Example III
Substantially the same as the first embodiment, the difference is that the opening grooves 3-7 are plural and are spirally distributed at 360 ° at the lower portion of the inner slide 3-3, and the opening grooves 3-7 have an inclination angle α with the axis of the inner slide 3-3, the inclination angle α being 0-60 °.
The first sealing elements 3-9 are multiple, the first sealing elements 3-9 and the second sealing elements 13-3 are rubber sealing rings, and the first sealing elements 3-9 are respectively arranged among the sand spraying holes 3-4, the shearing pins 3-5 and the positioning elements 3-6. The positioning members 3-6 in the respective embodiments are elastic positioning members.
Example IV
Substantially the same as the first embodiment, the difference is that the number of springs 13-5 between each opening slider 13-6 and the central tube 13-4 is 2-6, and a telescopic space for the opening slider 13-6 to be telescopic is provided between the opening slider 13-6 and the central tube 13-4. By setting the number of the springs 13-5 to be 2-6, the balance and stability effects can be better achieved, and the expansion and contraction of the opening slide block 13-6 and the stability of the opening load are ensured.
Example five
Basically, the opening tool is made of a dissolvable metal material.
After the fracturing construction is completed, the opening tool is formed by processing soluble metal materials, and can be completely dissolved according to preset time to form the full-drift-diameter fracturing completion well bore.
In addition, a closing groove 3-2 is further formed in the inner wall of the inner sliding sleeve, when selective production or secondary fracturing is required in the later period according to production requirements, a special closing pipe column matched with a special hydraulic control closing tool can be used in the fracturing completion sliding sleeve to be closed, the locking claw is opened through hydraulic pressure to enable the locking claw to be locked with the inner sliding sleeve 3-3, the special closing pipe column is lifted to drive the inner sliding sleeve 3-3 to ascend, sand blasting holes 3-4 in the outer sleeve 3-1 are closed, and selective closing of any fracturing completion sliding sleeve is achieved. If the fracturing completion sliding sleeve is opened again at a fixed point, an opening tool matched with the fixed point fracturing completion sliding sleeve can be selected, and the first embodiment or the second embodiment is repeated to complete the opening action.
The present invention is not limited to the above-described embodiments, and various changes may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the contents after the changes still fall within the scope of the present invention.
Claims (7)
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