CN114482958B - Casing well cementation full-drift diameter infinite stage fracturing completion device and fracturing completion method thereof - Google Patents
Casing well cementation full-drift diameter infinite stage fracturing completion device and fracturing completion method thereof Download PDFInfo
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- CN114482958B CN114482958B CN202011151525.7A CN202011151525A CN114482958B CN 114482958 B CN114482958 B CN 114482958B CN 202011151525 A CN202011151525 A CN 202011151525A CN 114482958 B CN114482958 B CN 114482958B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 229920001971 elastomer Polymers 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims description 51
- 238000007789 sealing Methods 0.000 claims description 39
- 238000003825 pressing Methods 0.000 claims description 26
- 238000005086 pumping Methods 0.000 claims description 24
- 238000005488 sandblasting Methods 0.000 claims description 16
- 238000010008 shearing Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 210000000078 claw Anatomy 0.000 description 4
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- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
The invention discloses a casing well cementation full-drift diameter infinite stage fracturing completion device and a fracturing completion method thereof, which are suitable for fracturing completion processes of horizontal wells and vertical wells. The device comprises a casing string, a hydraulic casing centralizer, a fracturing completion sliding sleeve, a differential pressure type fracturing completion sliding sleeve, a long wing well cementation rubber plug, a collision pressure setting valve and a bottom circulating valve, wherein the hydraulic casing centralizer and the fracturing completion sliding sleeve are multiple and are matched on the casing string to form a casing well cementation full-diameter infinite-stage-division fracturing completion device, the fracturing completion sliding sleeve is of a full-diameter design, and an opening tool and the fracturing completion sliding sleeve are matched one by one to finish the opening sliding sleeve; the number of the staged fracturing stages is not limited; the method can realize one-key one-opening of the well completion sliding sleeve by fracturing at any fixed point, can also realize one-key one-opening of the well completion sliding sleeve by fracturing at one stage and multiple clusters, can realize the full diameter of the well completion pipe string after fracturing, can meet the requirements of continuous rapid, large-scale and multistage multi-cluster fracturing construction, and can improve the fracturing efficiency.
Description
Technical Field
The invention relates to a fracturing completion device of an oil-water well in the petroleum industry, in particular to a casing well cementation full-drift diameter infinite stage staged fracturing completion device and a fracturing completion 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 technologies for opening a fracturing sliding sleeve in a delivery manner are 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 of 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 of the same size to gradually open the sliding sleeve, in principle, unlimited series and maintenance of 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 can not be normally opened and a fracturing layer section is lost; in addition, as the structure of the hydraulic fracturing device does not relate to a sealing mechanism, vertical blowby is easy to occur in fracturing construction; the starting balls in the later process still need to be discharged back, and the process is complex.
In addition, in a chinese patent application CN110905448a "an infinitely graded full-diameter fracturing sliding sleeve assembly system" published in 3 months 24 d 2020, it discloses a fracturing system comprising a plurality of sub-fracturing sliding sleeves connected in series through pipelines and in one-to-one correspondence with a plurality of opening mechanisms, the system can realize that after fracturing of all layers is completed, the whole tubular column is full-diameter without drilling operation, thus facilitating the later production management, and the series connection of the multistage sliding sleeves can realize infinite stages, but the positioning elastic member 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, causing opening failure and losing the fractured layers; meanwhile, the positioning groove is an annular gap between the upper joint and the 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 device 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 at overcoming the defects in the prior art and provides a casing well cementation full-drift-diameter infinite-stage-division fracturing completion device. The open tool can be matched with the fracturing completion sliding sleeve one by one, so that the full-drift diameter, unlimited, continuous and rapid multi-stage multi-cluster fracturing completion construction requirements of casing well cementation are met, and the construction scale, the stage number and the fracturing efficiency are improved.
The invention also provides a fracturing well completion method using the fracturing well completion device.
The technical scheme of the invention is as follows: the hydraulic casing centralizer is multiple and is matched with the casing string to form the casing well cementation full-drift infinite-range staged fracturing well completion device, hydraulic casing centralizers are arranged at two ends of each stage of fracturing well completion sliding sleeve, the differential pressure type fracturing well completion sliding sleeve, the impact pressure setting valve and the bottom circulating valve are sequentially arranged at the lower end of the casing string from top to bottom, and the long-wing well cementation rubber plug is movably arranged in the casing string and is in impact pressure sealing with the impact pressure setting valve after well cementation;
wherein, every fracturing completion sliding sleeve includes:
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 sliding 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, and the outer wall of the inner sliding sleeve is used for sealing the sand spraying hole; the outer surface of the inner sliding sleeve is movably provided with a positioning piece matched with the positioning groove; a first sealing piece is arranged between the outer sleeve and the inner sleeve; an opening groove and a closing groove are respectively formed in the inner wall of the inner sliding sleeve, and the opening groove is matched with an opening tool; an inner sliding sleeve accommodating cavity for opening the sand blasting hole when the inner sliding sleeve moves is arranged in the outer sleeve, and one positioning groove is positioned in the inner sliding 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 fracturing completion sliding sleeve is internally movably provided with an opening tool for opening the internal sliding sleeve, and the opening tool comprises:
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.
Preferably, the opening groove comprises a guide opening and a slide block groove connected with the guide opening, and the opening slide block is matched with the opening groove; a limiting groove for radially limiting the opening sliding block is formed between the tool lower joint and the tool upper joint as well as between the tool lower joint and the central tube; the upper and lower ends of the opening slide block are respectively provided with an inclined surface, and the inclined surface at the lower end of the opening slide block is 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, and a limiting groove 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, a plurality of guide keys extending out of the outer surface of the pressing cap are arranged on the pressing cap, and the guide keys are matched with the guide grooves.
Preferably, the number of the fracturing completion sliding sleeves on each stage of fracturing completion device is one or more.
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 fracturing completion method of a first casing cementing full-drift-diameter infinite-stage fracturing completion device, which comprises the following steps of:
1) After determining the staged fracturing stage number and the mounting position of the fracturing completion sliding sleeve, carrying out the matching of the fracturing completion pipe string;
2) Pumping the well cementation cement well cementation into the well by putting the matched well completion pipe string, pumping displacement fluid into the long-wing well cementation rubber plug, and continuously pressing after the long-wing well cementation rubber plug reaches the bottom of the well and is pressed with the pressing sitting valve, so that the hydraulic casing centralizer starts to work, and the casing centering and well cementation quality are ensured;
3) After the casing well cementation and completion, installing a large-drift-diameter fracturing wellhead, firstly, pumping and pressurizing to open a lowest-stage differential pressure type fracturing completion sliding sleeve so as to establish a communication channel between the casing and a stratum, and then sequentially and one by one delivering an opening tool matched with each stage of fracturing completion sliding sleeve from bottom to top so as to enable the opening tool to enter the fracturing completion sliding sleeve through pumping, and completing opening actions on each stage of fracturing completion sliding sleeve step by step;
4) 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;
5) 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 groove are completely matched with those of the opening sliding block of the opening tool, and the opening sliding block is in a free state and is locked with the opening groove; at the moment, the inner cavity of the tool is opened by the soluble ball seal, 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;
6) When the casing is pressed to a preset pressure under the action of hydraulic pressure, a shearing pin on the fracturing completion sliding sleeve is sheared, the tool is opened to drive 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; the inner sliding sleeve is opened in place, the sand blasting holes are exposed, the fracturing well completion sliding sleeve is in a completely opened state, and a fracturing channel is established;
7) 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;
8) 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;
9) 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 hydraulic delivery and the repeating of the actions of 4) -8) can be completed.
The invention provides a fracturing completion method of a second casing cementing full-drift-diameter infinite-stage fracturing completion device, which comprises the following steps of:
1) After determining the staged fracturing stage number and the mounting position of the fracturing completion sliding sleeve, carrying out the matching of the fracturing completion pipe string;
2) Pumping the well cementation cement well cementation into the well by putting the matched well completion pipe string, pumping displacement fluid into the long-wing well cementation rubber plug, and continuously pressing after the long-wing well cementation rubber plug reaches the bottom of the well and is pressed with the pressing sitting valve, so that the hydraulic casing centralizer starts to work, and the casing centering and well cementation quality are ensured;
3) After the casing well cementation and completion, installing a large-drift-diameter fracturing wellhead, firstly, pumping and pressurizing to open a lowest-stage differential pressure type fracturing completion sliding sleeve so as to establish a communication channel between the casing and a stratum, and then sequentially and one by one delivering an opening tool matched with each stage of fracturing completion sliding sleeve from bottom to top so as to enable the opening tool to enter the fracturing completion sliding sleeve through pumping, and completing opening actions on each stage of fracturing completion sliding sleeve step by step;
4) 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;
5) 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;
6) 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;
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 opening can be completed by hydraulic delivery and repeating the actions of 4) -6).
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 and the groove in the casing cementing full-drift diameter infinite stage fracturing completion device 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) A plurality of fracturing completion sliding sleeves can be placed in the casing cementing staged fracturing completion device according to the requirement, the fracturing completion sliding sleeves are designed to have equal diameters, no step difference exists, the number of fracturing steps is not limited, and the requirements of large-displacement and large-scale fracturing construction are met;
(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 fracturing completion device can be dissolved after being pressed, so that the full-diameter of the casing cementing full-diameter infinite-stage-division fracturing completion device is ensured, drilling and plugging and salvaging 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 diagram of a fracturing completion sliding sleeve of a casing cementing full-bore infinite stage fracturing completion device;
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 the open tool configuration corresponding to FIG. 1a in a casing cementing full-bore infinite stage fracturing completion apparatus;
FIG. 2 'is a schematic illustration of the open tool configuration corresponding to FIG. 1a' in a casing cementing full-bore infinite stage fracturing completion apparatus;
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 schematic diagram of an assembly of a casing cementing full-bore infinite stage-by-stage fracturing completion device in one cluster (one key-open);
FIG. 3' is a schematic diagram of an assembly of a casing cementing full-bore infinite stage-by-stage fracturing completion device with one-stage multi-cluster (one-key multi-open);
FIG. 4 is a state diagram of an open tool mated with a frac completion slip without the sand blast open;
FIG. 4a is a state diagram of an opening tool in cooperation with a frac completion slip to open a sand blast;
FIG. 5 is a schematic diagram of a dedicated shut-off string;
In the figure: 1. a casing string; 2. a hydraulic casing centralizer; 3. fracturing the well completion sliding sleeve; 4. cementing cement; 5. long wing well cementation rubber plug; 6. pressing the sitting valve; 7. a bottom circulation valve; 11. a coiled tubing; 12. a special hydraulic control closing tool; 13. opening the tool; 14. differential pressure type fracturing well completion sliding sleeve; 3-1, a jacket; 3-2, closing the groove; 3-3, an inner sliding sleeve; 3-4, sand spraying holes; 3-5, shearing pins; 3-6, locating piece; 3-7, opening the groove; 3-8, positioning groove; 3-9, a first sealing member; 3-10 parts of sliding sleeve lower joint, 3-11 parts of sliding block groove; 3-12, a guiding groove; 3-13, a guide opening; 13-1, soluble spheres; 13-2, tool upper joint; 13-3, a second seal; 13-4, a central tube; 13-5, springs; 13-6, opening the sliding block; 13-7, connecting pieces; 13-8, a guide key; 13-9, tool lower joint; 13-10, pressing the 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', 4 and 4a, a casing cementing full-drift infinite stage staged fracturing completion device comprises a casing string 1, a plurality of hydraulic casing centralizers 2, a plurality of fracturing completion sliding sleeves 3 (determined according to staged fracturing stages), a differential pressure fracturing completion sliding sleeve 14, a long wing cementing rubber plug 5, a bump-pressure setting valve 6 and a bottom circulation valve 7. The hydraulic casing centralizers 2 are multiple and are matched on the casing string 1, the fracturing well completion sliding sleeve 3 is multiple and is matched on the casing string 1 to form a casing well cementation full-drift infinite-stage fracturing well completion device, the hydraulic casing centralizers 2 are arranged at two ends of each stage of fracturing well completion sliding sleeve, the differential pressure fracturing well completion sliding sleeve 14, the bumping and pressing sitting valve 6 and the bottom circulating valve 7 are sequentially arranged at the lower end of the casing string 1 from top to bottom, and the long-wing well cementation rubber plug 5 is movably arranged in the casing string 1 and bumps and presses and seals with the bumping and pressing sitting valve 6 after well cementation.
And a plurality of clusters of fracturing completion sliding sleeves formed by a plurality of fracturing completion sliding sleeves 3 are arranged on each stage of fracturing completion device.
The fracturing well completion sliding sleeve 3 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 13 includes: the device comprises a soluble ball 13-1, an upper tool joint 13-2, a second sealing piece 13-3, a central tube 13-4, a spring 13-5, an opening slide block 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 tool upper joint 13-2, an opening slide block 13-6 matched with the opening groove 3-7 is movably arranged on the outer wall of the central tube 13-4, and a spring 13-5 used for radially expanding and contracting the opening slide block 13-6 is further arranged on the outer wall of the central tube 13-4; the upper end of the tool lower joint 13-9 is connected with the lower end of the central tube 13-4 in a threaded manner, and the lower end of the tool upper joint 13-2, the tool lower 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, and when the opening tool 13 is completely matched with the fracturing completion sliding sleeve 3, 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, and the inclined surface at the lower end of the opening slide block 13-6 is matched with the guiding slope surface of the lower joint 3-10 of the sliding sleeve, so that the opening slide block 13-6 is separated from the slide block groove 3-11, and the opening tool 13 enters the next cluster of the well completion sliding sleeve 3 which is completely matched, the same step as the opening of the sliding sleeve is completed, and one key multiple opening actions are realized.
The specific process method comprises the following steps:
1) The casing well cementation full-drift infinite stage fracturing completion device is used for carrying out the matching connection of a fracturing completion pipe string after the stage fracturing progression and the mounting position of the fracturing completion sliding sleeve 3 are determined, the matched fracturing completion pipe string is put into a well to be pumped into well cementation cement 4 for well cementation, a long-wing well cementation rubber plug 5 is put into a displacement fluid to be pumped, the long-wing well cementation rubber plug 5 reaches the bottom of the well and is continuously pressed after being pressed with a bump-press seating valve 6, so that the hydraulic casing centralizer 3 starts to work, the centering of a casing is ensured, and the well cementation quality and the stage effect are improved.
2) And after the well is completed by casing cementing, installing a large-drift-diameter fracturing wellhead. First, the lowermost differential pressure fracturing completion sleeve 14 is opened by pumping pressurization, thereby establishing a communication path between the casing and the formation. Then sequentially and hydraulically delivering opening tools 13 matched with the fracturing completion sliding sleeve 3 one by one from bottom to top, gradually opening each level of multi-cluster fracturing completion sliding sleeve 3, completing one-key multi-opening action, and performing multi-level multi-cluster staged fracturing completion operation.
3) After staged fracturing is finished, the opening tool 13 is formed by machining soluble metal materials, and can be completely dissolved according to preset time to form a full-diameter fracturing completion shaft.
4) In the later stage, according to the production requirement, when selective production or secondary fracturing is required, as shown in fig. 5, a special closing pipe column is put into a special closing pipe column matched with a special hydraulic closing tool 12 by a continuous oil pipe 11 (or an oil pipe) to a fracturing completion sliding sleeve 3 to be closed, when the special hydraulic closing tool 12 enters an inner sliding sleeve 3-3 of the fracturing completion sliding sleeve 3 to be closed, a locking claw of the special hydraulic closing tool 12 is extruded and locked in a combined manner with a closing groove 3-2 by pressing, the special closing pipe column is lifted to drive the inner sliding sleeve 3-3 to ascend, a sand blasting hole 3-4 on an outer sleeve 3-1 is closed, at the moment, the inner sliding sleeve 3-3 drives a positioning piece 3-6 (an elastomer) to climb out of a positioning groove 3-8 on the lower part and be embedded into the positioning groove 3-8 on the upper part, and after the closing action is completed, the locking claw on the special hydraulic closing tool 12 is retracted, and the special closing pipe column can be lifted. The special closing pipe column can realize the closing of the fracturing completion sliding sleeve 3 at any fixed point; if the fracturing completion sliding sleeve 3 is opened again at a fixed point, an opening tool 13 matched with the fixed point fracturing completion sliding sleeve 3 can be selected to implement the opening action.
In step 2), when the fracturing construction is performed, the opening tool 13 is delivered, and the fracturing completion sliding sleeve 3 is pumped 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).
① When the opening tool 13 does not match the frac completion sleeve 3, i.e. the opening slide 13-6 does not match the opening recess 3-7 in shape and size, the opening action cannot be achieved, at which time the opening slide 13-6 is always in a compressed state and passes through the unmatched sleeve until the corresponding matched sleeve is entered.
② When the opening tool 13 is matched with the fracturing completion sliding sleeve 3, the opening slide block 13-6 is in a compressed state when the opening slide block does not enter the opening slide groove 3-7, and when the opening slide block 3-7 enters the opening slide groove 3-7, the shape and the size of the opening slide groove 3-7 are completely matched with those of the opening slide block 13-6 of the opening tool 13, and the opening slide block 13-6 is in a free state and is locked with the slide block groove 3-11. At this time, the inner cavity of the tool 13 is sealed and opened by the soluble ball 13-1, the second sealing element 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 sleeve is pressed to a preset pressure under the action of hydraulic pressure, the shearing pin 3-5 on the fracturing well completion sliding sleeve 3 is sheared, the inner sliding sleeve 3-3 is driven to move downwards by the opening tool 13, the positioning element 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 element 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 3 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 flow limiting valves are in a flow limiting state, under a certain pumping displacement, enough pressure still exists in the sleeve to push the opening tool 13 to enter the next cluster of fracturing completion sliding sleeve 3, when all the multiple clusters of fracturing completion sliding sleeves 3 are opened for preparing 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 13 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 3 and continuously moves downwards to enter 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 13 is gradually separated from the inner sliding sleeve 3-3, the inner sliding sleeve 3-3 is positioned in the 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 13 continues to descend under the hydraulic action and enters the next cluster of the matched fracturing completion sliding sleeve 3, ②、③ actions are continued, the corresponding matched fracturing completion sliding sleeve 3 is completely opened, a fracturing channel is established until the opening tool 13 enters the last cluster of the matched fracturing completion sliding sleeve 3 to finish 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 finished.
The parameters C, D and alpha on the opening groove 3-7 on the fracturing well completion sliding sleeve 3 and the parameters C ', D', alpha 'on the opening sliding block 13-6 of the opening tool 13 are in one-to-one correspondence, so that the opening action of the inner sliding sleeve 3-3 can be realized, and the parameters C', D ', alpha' on the opening tool 13 can be matched with the parameters C, D and alpha on a plurality of identical fracturing well completion sliding sleeves 3.
The C, D, alpha parameters on the plurality of frac completion slips 3 that are identical in the present invention should be set so that all parameters of the type of slips identify all parameters of C ', D ', alpha ' on the corresponding opening tool 13 that are one-to-one mated with the type of slips. When the opening grooves 3-7 on the plurality of fracturing completion sliding sleeves 3 are completely matched with the opening tool 13 in structure, the opening sliding blocks 13-6 can be extruded into the opening grooves 3-7 on the plurality of fracturing completion sliding sleeves 3 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 sleeve 3 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. Wherein, when the multi-stage multi-cluster is multi-stage staged fracturing, one stage is composed of a plurality of fracturing completion sliding sleeves 3 with identical parameters.
The parameters C, D and alpha on the identical fracturing completion sliding sleeves 3 and the parameters C ', D ' and alpha ' on the corresponding opening tools 13 can be correspondingly and randomly changed and combined, and the full-drift diameter infinite-stage 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 shown in fig. 1, 1a, 1b, 2a, 2b, 3,4 and 4a, as a preferred embodiment, is substantially the same as the first embodiment except that one fracturing completion sleeve 3 is provided on each stage of fracturing completion device, and the opening grooves 3-7 on the fracturing completion sleeve 3 comprise guide openings 3-13, slider grooves 3-11 and guide grooves 3-12. Wherein, the guiding opening 3-13 is conical and is connected with the sliding block groove 3-11, 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 sleeved 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 matches the shape and size of the opening slider 13-6 and the guide key 13-8.
The specific process method comprises the following steps:
1) The casing well cementation full-drift infinite stage fracturing completion device is used for carrying out the matching connection of a fracturing completion pipe string after the stage fracturing progression and the mounting position of the fracturing completion sliding sleeve 3 are determined, the matched fracturing completion pipe string is put into a well to be pumped into well cementation cement 4 for well cementation, a long-wing well cementation rubber plug 5 is put into a displacement fluid to be pumped, the long-wing well cementation rubber plug 5 reaches the bottom of the well and is continuously pressed after being pressed with a bump-press seating valve 6, so that the hydraulic casing centralizer 3 starts to work, the centering of a casing is ensured, and the well cementation quality and the stage effect are improved.
2) And after the well is completed by casing cementing, installing a large-drift-diameter fracturing wellhead. First, the lowermost differential pressure fracturing completion sleeve 14 is opened by pumping pressurization, thereby establishing a communication path between the casing and the formation. Then sequentially and sequentially hydraulically delivering opening tools 13 matched with the fracturing completion sliding sleeves 3 one by one from bottom to top, gradually opening each stage of fracturing completion sliding sleeves 3, completing one-key one-opening action, and performing infinite stage-division fracturing completion operation.
3) After staged fracturing is finished, the opening tool 13 is formed by machining soluble metal materials, and is completely dissolved according to preset time to form a full-diameter fracturing completion well bore.
4) In the later stage, according to the production requirement, when selective production or secondary fracturing is required, as shown in fig. 5, a special closing pipe column is put into a special closing pipe column matched with a special hydraulic closing tool 12 by a continuous oil pipe 11 (or an oil pipe) to a fracturing completion sliding sleeve 3 to be closed, when the special hydraulic closing tool 12 enters an inner sliding sleeve 3-3 of the fracturing completion sliding sleeve 3 to be closed, a locking claw of the special hydraulic closing tool 12 is extruded and locked in a combined manner with a closing groove 3-2 by pressing, the special closing pipe column is lifted to drive the inner sliding sleeve 3-3 to ascend, a sand blasting hole 3-4 on an outer sleeve 3-1 is closed, at the moment, the inner sliding sleeve 3-3 drives a positioning piece 3-6 (an elastomer) to climb out of a positioning groove 3-8 on the lower part and be embedded into the positioning groove 3-8 on the upper part, and after the closing action is completed, the locking claw on the special hydraulic closing tool 12 is retracted, and the special closing pipe column can be lifted. The special closing pipe column can realize the closing of the fracturing completion sliding sleeve 3 at any fixed point; if the fracturing completion sliding sleeve 3 is opened again at a fixed point, an opening tool 13 matched with the fixed point fracturing completion sliding sleeve 3 can be selected to implement the opening action.
In step 2), when the fracturing construction is performed, the opening tool 13 is delivered, and the fracturing completion sliding sleeve 3 is pumped 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).
① When the opening tool 13 is not matched with the fracturing completion sliding sleeve 3, namely, the shape and the size of the opening sliding block 13-6 and the guide key 13-8 are not matched with the shape and the size of the sliding block groove 3-11 and the guide groove 3-12 respectively, the opening action cannot be realized, and at the moment, the opening sliding 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 13 is matched with the fracturing completion sliding sleeve 3, 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 13, 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 this time, the inner cavity of the tool 13 is sealed and opened by the soluble ball 13-1, the second sealing element 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 3 is sheared, the inner sliding sleeve 3-3 is driven to move downwards by the opening tool 13, the positioning element 3-6 climbs out of the positioning groove 3-8 and is in a compression state, and the positioning element 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 13 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 3 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 3 at any fixed point is completed.
The parameters A, B, C, D and alpha on the opening groove 3-7 on the fracturing well completion sliding sleeve 3, the parameters A ', B ', alpha ' on the guiding key 13-8 of the opening tool 13 and the parameters C ', D ', alpha ' on the opening sliding block 13-6 are all in one-to-one correspondence to realize the opening action of the inner sliding sleeve 3-3, and the parameters A, B, C, D and alpha on each fracturing well completion sliding sleeve 3 can only be matched with one single parameter, namely the parameters A ', B ', C ', D ', alpha ' on the opening tool 13.
The A, B, C, D, alpha parameters on the fracturing completion sleeve 3 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 13 that uniquely mates with the sleeve. When the opening groove 3-7 on one fracturing completion sliding sleeve 3 is completely matched with the opening tool 13, 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 3 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 3 and the parameters A ', B ', C ', D ' and alpha ' on the corresponding opening tool 13 can be changed and combined randomly in a one-to-one correspondence manner, and the full-drift diameter infinite-level 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 may have an inclination angle α with respect to the axis of the inner slide 3-3, the inclination angle α being 0-60 °.
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 same as the first embodiment, the difference is that the first sealing members 3-9 are plural, the first sealing members 3-9 and the second sealing members 13-3 are rubber sealing rings, and the first sealing members 3-9 are respectively arranged among the sand spraying holes 3-4, the shearing pins 3-5 and the positioning members 3-6. The positioning members 3-6 in the respective embodiments are elastic positioning members.
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 (6)
1. The casing well cementation full-drift infinite stage-division fracturing well completion device is characterized by comprising a casing string, a hydraulic casing centralizer, a fracturing well completion sliding sleeve, a differential pressure fracturing well completion sliding sleeve, a long-wing well cementation rubber plug, a bumping and pressing sitting valve and a bottom circulating valve, wherein the hydraulic casing centralizer is multiple and is matched and connected on the casing string, the fracturing well completion sliding sleeve is multiple and is matched and connected on the casing string to form the casing well cementation full-drift infinite stage-division fracturing well completion device, hydraulic casing centralizers are arranged at two ends of each stage of fracturing well completion sliding sleeve, the differential pressure fracturing well completion sliding sleeve, the bumping and pressing sitting valve and the bottom circulating valve are sequentially arranged at the lower end of the casing string from top to bottom, and the long-wing well cementation rubber plug is movably arranged in the casing string and is bumped and sealed with the bumping and pressing sitting valve after well cementation;
wherein, every fracturing completion sliding sleeve includes:
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 sliding 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, and the outer wall of the inner sliding sleeve is used for sealing the sand spraying hole; the outer surface of the inner sliding sleeve is movably provided with a positioning piece matched with the positioning groove; a first sealing piece is arranged between the outer sleeve and the inner sleeve; an opening groove and a closing groove are respectively formed in the inner wall of the inner sliding sleeve, and the opening groove is matched with an opening tool; an inner sliding sleeve accommodating cavity for opening the sand blasting hole when the inner sliding sleeve moves is arranged in the outer sleeve, and one positioning groove is positioned in the inner sliding 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;
The inside activity of fracturing completion sliding sleeve is equipped with the opening tool that is used for opening interior sliding sleeve, 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;
the tool lower joint is arranged at the lower end of the central tube;
The opening groove comprises any one of the following:
One of the opening grooves comprises a guide opening and a sliding block groove connected with the guide opening, and the opening sliding block is matched with the opening groove;
A limiting groove for radially limiting the opening sliding block is formed between the tool lower joint and the tool upper joint as well as between the tool lower joint and the central tube; the upper end and the lower end of the opening slide block are respectively provided with an inclined surface, and the inclined surface at the lower end of the opening slide block is matched with the guide slope of the lower joint of the sliding sleeve;
The other 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, and a limiting groove 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, a plurality of guide keys extending out of the outer surface of the pressing cap are arranged on the pressing cap, and the guide keys are matched with the guide grooves;
The opening grooves are in a plurality and are spirally distributed at the lower part of the inner sliding sleeve at 360 degrees, the axis of 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.
2. The casing cementing full-bore infinite stage fracturing completion device according to claim 1, wherein: the number of the fracturing completion sliding sleeves on each stage of fracturing completion device is one or more.
3. The casing cementing full-bore infinite stage fracturing completion device according to claim 2, wherein: 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 each opening slide block and the central tube.
4. The casing cementing full-bore infinite stage fracturing completion device according to claim 2, wherein: the positioning piece is an elastic positioning piece, and the opening tool is made of a soluble metal material.
5. A method of fracturing completion of a casing cementing full-bore infinite stage fracturing completion apparatus according to any of claims 1-4, comprising the steps of:
1) After determining the staged fracturing stage number and the mounting position of the fracturing completion sliding sleeve, carrying out the matching of the fracturing completion pipe string;
2) Pumping the well cementation cement well cementation into the well by putting the matched well completion pipe string, pumping displacement fluid into the long-wing well cementation rubber plug, and continuously pressing after the long-wing well cementation rubber plug reaches the bottom of the well and is pressed with the pressing sitting valve, so that the hydraulic casing centralizer starts to work, and the casing centering and well cementation quality are ensured;
3) After the casing well cementation and completion, installing a large-drift-diameter fracturing wellhead, firstly, pumping and pressurizing to open a lowest-stage differential pressure type fracturing completion sliding sleeve so as to establish a communication channel between the casing and a stratum, and then sequentially and one by one delivering an opening tool matched with each stage of fracturing completion sliding sleeve from bottom to top so as to enable the opening tool to enter the fracturing completion sliding sleeve through pumping, and completing opening actions on each stage of fracturing completion sliding sleeve step by step;
4) 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;
5) 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 groove are completely matched with those of the opening sliding block of the opening tool, and the opening sliding block is in a free state and is locked with the opening groove; at the moment, the inner cavity of the tool is opened by the soluble ball seal, 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;
6) When the casing is pressed to a preset pressure under the action of hydraulic pressure, a shearing pin on the fracturing completion sliding sleeve is sheared, the tool is opened to drive 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; the inner sliding sleeve is opened in place, the sand blasting holes are exposed, the fracturing well completion sliding sleeve is in a completely opened state, and a fracturing channel is established;
7) 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;
8) 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;
9) 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 hydraulic delivery and the repeating of the actions of 4) -8) can be completed.
6. A method of fracturing completion of a casing cementing full-bore infinite stage fracturing completion apparatus according to any of claims 1-4, comprising the steps of:
1) After determining the staged fracturing stage number and the mounting position of the fracturing completion sliding sleeve, carrying out the matching of the fracturing completion pipe string;
2) Pumping the well cementation cement well cementation into the well by putting the matched well completion pipe string, pumping displacement fluid into the long-wing well cementation rubber plug, and continuously pressing after the long-wing well cementation rubber plug reaches the bottom of the well and is pressed with the pressing sitting valve, so that the hydraulic casing centralizer starts to work, and the casing centering and well cementation quality are ensured;
3) After the casing well cementation and completion, installing a large-drift-diameter fracturing wellhead, firstly, pumping and pressurizing to open a lowest-stage differential pressure type fracturing completion sliding sleeve so as to establish a communication channel between the casing and a stratum, and then sequentially and one by one delivering an opening tool matched with each stage of fracturing completion sliding sleeve from bottom to top so as to enable the opening tool to enter the fracturing completion sliding sleeve through pumping, and completing opening actions on each stage of fracturing completion sliding sleeve step by step;
4) 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;
5) 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;
6) 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;
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 opening can be completed by hydraulic delivery and repeating the actions of 4) -6).
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| CN115653541B (en) * | 2022-12-23 | 2023-03-21 | 哈尔滨艾拓普科技有限公司 | Intelligent key label-based segmented multi-cluster fracturing intelligent sliding sleeve system and method |
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