CN112412404A - Full-bore soluble sliding sleeve assembly multistage fracturing string for separate-layer fracturing and fracturing method thereof - Google Patents
Full-bore soluble sliding sleeve assembly multistage fracturing string for separate-layer fracturing and fracturing method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000004090 dissolution Methods 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000005488 sandblasting Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 210000000664 rectum Anatomy 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000004576 sand Substances 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 238000005406 washing Methods 0.000 abstract description 3
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- 239000004636 vulcanized rubber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a full-drift diameter soluble sliding sleeve component multistage fracturing string for separate-layer fracturing and a fracturing method thereof, wherein the string comprises a soluble throttling bottom valve, a plurality of stages of full-drift diameter soluble sliding sleeve components, a K344 packer, a sand-prevention hydraulic anchor and a hydraulic safety joint; the soluble throttling bottom valve comprises a bottom valve upper connector, a bottom valve lower connector, a throttling valve core and a soluble metal support ring; according to the fracturing string and the construction method thereof, a structural design of 'a small amount of soluble + a large amount of insoluble' is adopted for parts inside a full-drift-diameter soluble sliding sleeve assembly and a soluble throttling bottom valve, meanwhile, a delayed dissolution coating technology is adopted for the outer surface of the soluble part, the structural reliability during well entry and fracturing construction is improved, the pressed soluble part can be automatically dissolved in a fracturing flow-back fluid environment, the insoluble part freely falls into an artificial well bottom under the action of self weight, the full drift diameter of the whole string is finally realized, and the requirements of subsequent fluid drainage and gas production, sand washing, testing, production fluid profile monitoring operation and secondary repeated transformation operation are met.
Description
Technical Field
The invention relates to the technical field of fracturing operation of oil and gas fields, in particular to a full-drift-diameter soluble sliding sleeve assembly multistage fracturing string for separate layer fracturing and a fracturing method thereof.
Background
In recent years, with the continuous deep development of domestic oil and gas fields, the 'K344 packer + sand blasting sliding sleeve' layered fracturing technology has become a main technology for improving the single-well yield of the oil and gas fields. According to the process technology, interlayer isolation of a fracturing layer section is realized through a K344 packer, a communication channel between a shaft and the reservoir layer is established through a throttling bottom valve and a sand blasting sliding sleeve, the purposes of completing multistage layered fracturing and producing a combined layer by running a tubular column once can be achieved, and the process technology has the advantages of convenience in field operation, high operation efficiency, low cost and small risk. However, in a large amount of site operations, the technology also has a plurality of limitations, restricts the further popularization and application of the technology, most oil and gas wells usually use the fracturing string as a production string, and because the fracturing is limited by the inner diameters of the throttling bottom valve and the sand blasting sliding sleeve ball seat, the whole fracturing string cannot realize full drift diameter, influences the subsequent liquid drainage and gas production, sand blasting, testing and monitoring of the production liquid profile operation, and cannot perform the problem of secondary repeated transformation operation.
Disclosure of Invention
The invention aims to solve the technical problem that the whole drift diameter of the whole fracturing string can not be realized due to the limitation of the inner diameters of a throttling bottom valve and a sand blasting sliding sleeve ball seat after fracturing in the conventional 'K344 packer + sand blasting sliding sleeve' layered fracturing process technology, so that the subsequent liquid drainage and gas production, sand washing, testing and production profile monitoring operations can not be influenced, and the problem that secondary repeated transformation operations can not be carried out can also be solved.
In order to solve the technical problems, the invention adopts the technical scheme that: a full-drift diameter soluble sliding sleeve component multistage fracturing string for separate-layer fracturing comprises a soluble throttling bottom valve, a plurality of stages of full-drift diameter soluble sliding sleeve components, a K344 packer, a sand-prevention hydraulic anchor and a hydraulic safety joint which are sequentially connected from bottom to top, wherein all the tools are connected through oil pipes and are arranged inside a production casing; the soluble sliding sleeve subassembly of full latus rectum of several levels includes that the soluble sliding sleeve of full latus rectum and soluble sliding sleeve dabber catcher of supporting use of setting up from top to bottom and supporting in several levels.
The soluble throttling bottom valve comprises:
the inner wall of the upper end of the bottom valve upper joint is provided with a conical oil pipe internal thread, the bottom valve upper joint is connected with an oil pipe through the conical oil pipe internal thread and is installed at the bottommost part of a fracturing string, the inner wall of the lower end of the bottom valve upper joint is a first contact surface, and the outer wall of the lower end of the bottom valve upper joint is provided with an external thread;
the inner wall of the upper end of the lower connector of the bottom valve is provided with an internal thread which is connected with an external thread of the outer wall of the lower end of the upper connector of the bottom valve through the thread, the inner wall of the lower end of the internal thread of the inner wall of the upper end of the lower connector of the bottom valve is a second contact surface, the inner wall of the lower end of the second contact surface is raised and forms a circle of limiting step, and the tail part of the limiting step is a horn;
the outer wall of the throttling valve core is of a stepped plane structure, the outer wall of the upper end of the throttling valve core is matched with the first contact surface, the uppermost end of the outer wall is provided with an annular groove, the first O-shaped sealing ring arranged in the annular groove is sealed with the first contact surface, the outer diameter of the outer wall of the lower end of the throttling valve core is smaller than that of the outer wall of the upper end, the outer wall of the lower end of the throttling valve core, the second contact surface and the limiting step form an annular cavity together, the upper end of the inner wall of the throttling valve core is a horn-shaped large chamfer, the lower end of the inner wall of the throttling valve;
the soluble metal support ring is of an annular structure and is arranged in an annular cavity formed by the outer wall of the lower end of the throttle valve core, a second contact surface of the lower joint of the bottom valve and the limiting step;
the inner diameter of a first contact surface of the upper connector of the bottom valve is smaller than the inner diameter of a limiting step of the lower connector of the bottom valve, the inner diameter of the limiting step of the lower connector of the bottom valve is smaller than the inner diameter of a second contact surface, and after the soluble metal support ring is dissolved, the throttle valve core is guaranteed to smoothly fall into the bottom of the well.
The soluble metal support ring is made of soluble magnesium-aluminum alloy, takes magnesium as a matrix, and has the density of 1.8-2.0 g/cm3。
The outer surface of the soluble metal support ring is coated with a phenolic resin or modified phenolic resin thin coating, the thickness of the thin coating is 800-1000 microns, the slow dissolution within 72 hours is guaranteed, after 72 hours, the thin coating is broken, and the soluble metal support ring is rapidly dissolved.
A fracturing method of a full-bore soluble sliding sleeve assembly multistage fracturing string for separate-layer fracturing comprises the following steps:
(1) preparing a corresponding number of full-bore soluble sliding sleeve assemblies according to the reservoir conditions of an oil-gas well, and assembling a soluble throttling bottom valve, a corresponding number of the full-bore soluble sliding sleeve assemblies, a K344 packer, a sand-prevention hydraulic anchor and a hydraulic safety joint on an oil pipe to form a fracturing string;
(2) the assembled fracturing string is put into a production casing of an oil and gas well, so that the sand blasting holes of the full-bore soluble sliding sleeve in each stage of the full-bore soluble sliding sleeve assembly correspond to the positions of reservoir sections in the oil and gas well;
(3) opening the sleeve valve to make the distance from the oil pipe less than 0.5m3After 1 oil pipe internal volume of pad fluid is circularly washed in a displacement of/min, the displacement is rapidly increased to 1.2m3Min, setting all K344 packers when the differential pressure between the oil pipe and the production casing reaches 0.3-0.5 MPa;
(4) closing a sleeve valve, pumping a balance pressure into an annular space of an oil pipe and a production sleeve by a surface pump truck, and performing fracturing construction on the 1 st layer through a soluble throttling bottom valve;
(5) after the 1 st layer fracturing construction is finished, a soluble ball with the size corresponding to the first-stage full-bore soluble sliding sleeve is thrown into the fracturing string through a ball throwing plug valve of a wellhead, the pressure is suppressed to shear a control shear pin, a sand blasting hole is exposed to form a fracturing channel, the 2 nd layer is subjected to fracturing construction, and the 1 st layer is simultaneously blocked;
(6) applying the same construction method in the step (5) to finish the fracturing construction of the 3 rd to 4 th layer or the subsequent more intervals;
(7) after the fracturing construction of all intervals is completed, the soluble part in the fracturing string can be dissolved automatically in the fracturing flow-back fluid environment, and the insoluble part freely falls into the artificial shaft bottom under the self-weight action due to the constraint of the soluble part, so that the full drift diameter of the whole fracturing string is finally realized.
The fracturing string can achieve up to 7 stages of fracturing in a 5-1/2' production casing.
The invention has the beneficial effects that:
(1) the outer surfaces of the soluble parts in the full-drift-diameter soluble sliding sleeve assembly and the soluble throttling bottom valve adopt a delayed dissolution coating technology, the coating can effectively protect the soluble parts for more than 72 hours in liquid in a well, the initial dissolution time is controllable, and the structural reliability of the full-drift-diameter soluble sliding sleeve assembly and the soluble throttling bottom valve in the well entering and fracturing construction periods is effectively improved.
(2) The soluble sliding sleeve component with the full drift diameter and the parts inside the soluble throttling bottom valve adopt the structural design of 'a small amount of soluble parts and a large amount of insoluble parts', and because the number of the soluble parts is small, the complete dissolution is relatively easy, the effectiveness of the fracturing string is ensured, and the full drift diameter can be quickly realized.
(3) The purpose of completing multi-level separate-layer fracturing and producing a combined layer by running a tubular column once can be achieved, and the method has the advantages of convenience in field operation, high operation efficiency, low cost and small risk of the conventional 'K344 packer + sand blasting sliding sleeve' separate-layer fracturing tubular column.
(4) All soluble parts in the fracturing string after fracturing can be dissolved automatically in the fracturing flow-back fluid environment, and part of insoluble parts freely fall into the artificial well bottom under the self-weight action due to the constraint of the soluble parts, so that the full drift diameter of the whole fracturing string is finally realized.
(5) The full drift diameter of the whole fracturing string after pressing can meet the requirements of subsequent liquid drainage and gas production, sand washing, testing, production profile monitoring operation and secondary repeated transformation operation.
Drawings
FIG. 1 is a schematic view of a connection structure of a multi-stage fracturing string of a full-bore soluble sliding sleeve assembly for separate-zone fracturing of the present invention;
FIG. 2 is a schematic diagram of the structure of a soluble throttling bottom valve of the present invention;
FIG. 3 is a schematic structural view of a full bore soluble sliding sleeve in a full bore soluble sliding sleeve assembly according to an embodiment of the present disclosure;
figure 4 is a schematic structural view of a soluble sliding sleeve mandrel trap in a full bore soluble sliding sleeve assembly according to an embodiment of the present invention.
In the figure, A-a soluble throttling bottom valve, B-a soluble sliding sleeve mandrel catcher, C-K344 packer, D-a first stage full-bore soluble sliding sleeve, E-a second stage full-bore soluble sliding sleeve, F-a third stage full-bore soluble sliding sleeve, G-a sand control hydraulic anchor, an H-hydraulic safety joint, an I-oil pipe and a J-production casing; 1-bottom valve upper joint, 2-first O-shaped sealing ring, 3-throttling valve core, 4-soluble metal supporting ring, 5-bottom valve lower joint, 6-vulcanized rubber sealing ring, 7-second O-shaped sealing ring, 8-control shear pin, 9-ball seat integrated soluble sliding sleeve mandrel, 10-sliding sleeve outer barrel, 11-sand blasting hole, 12-soluble ball, 13-guiding head, 14-catcher outer barrel, 15-soluble metal supporting ring, 16-first soluble rubber O-shaped sealing ring, 17-second soluble rubber O-shaped sealing ring and 18-sliding sleeve mandrel catcher inner core.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The K344 packer, the sand control hydraulic anchor, the hydraulic safety joint, the oil pipe and the production casing pipe which are related by the invention are common accessories in the fracturing operation process and are sold in the market.
As shown in figure 1, the full-drift diameter soluble sliding sleeve assembly multistage fracturing string for separate-zone fracturing comprises a soluble throttling bottom valve A, a plurality of stages of full-drift diameter soluble sliding sleeve assemblies I/II/III, a K344 packer C, a sand-prevention hydraulic anchor G and a hydraulic safety joint H which are sequentially connected from bottom to top, wherein the tools are connected through an oil pipe I and are arranged inside a production casing J.
The multi-stage full-bore soluble sliding sleeve component I/II/III comprises a plurality of stages of full-bore soluble sliding sleeve D/E/F and a soluble sliding sleeve mandrel catcher B which are arranged up and down and matched for use.
As shown in fig. 1-2, the bottom valve a comprises:
the inner wall of the upper end of the bottom valve connector 1 is provided with a conical oil pipe internal thread, the upper end of the bottom valve connector is connected with an oil pipe through the conical oil pipe internal thread and is installed at the bottommost part of a fracturing string, the inner wall of the lower end of the bottom valve connector is a first contact surface, and the outer wall of the lower end of the bottom valve connector is provided with an external thread;
the inner wall of the upper end of the lower connector 5 of the bottom valve is provided with an internal thread which is connected with an external thread on the outer wall of the lower end of the upper connector 1 of the bottom valve through the thread, the inner wall of the lower end of the internal thread on the inner wall of the upper end of the lower connector 5 of the bottom valve is a second contact surface, the inner wall of the lower end of the second contact surface is raised and forms a circle of limiting step, and the tail part of the limiting step is a horn;
the outer wall of the throttling valve core 3 is of a stepped plane structure, the outer wall of the upper end of the throttling valve core is matched with the first contact surface, the uppermost end of the outer wall is provided with an annular groove, the first O-shaped sealing ring 2 arranged in the annular groove is sealed with the first contact surface, the outer diameter of the outer wall of the lower end of the throttling valve core is smaller than that of the outer wall of the upper end of the throttling valve core, the outer wall of the lower end of the throttling valve core, the second contact surface and a limiting step form an annular cavity together, the upper end of the inner wall of the throttling valve core 3 is a horn-shaped large chamfer, the lower end of the;
the soluble metal support ring 4 is of an annular structure and is arranged in an annular cavity formed by the outer wall of the lower end of the throttle valve core 3, a second contact surface of the lower joint 5 of the bottom valve and a limiting step;
the inner diameter of a first contact surface of the upper connector 1 of the bottom valve is smaller than the inner diameter of a limit step of the lower connector 5 of the bottom valve, the inner diameter of the limit step of the lower connector 5 of the bottom valve is smaller than the inner diameter of a second contact surface, and after the soluble metal support ring 4 is dissolved, the throttle valve core 3 is ensured to smoothly fall into the bottom of the well.
The soluble metal support ring 4 is made of soluble magnesium aluminum alloy, takes magnesium as a matrix, and has the density of 1.8-2.0 g/cm3。
The outer surface of the soluble metal support ring 4 is coated with a phenolic resin or modified phenolic resin thin coating, the thickness of the thin coating is 800-1000 microns, slow dissolution within 72 hours is guaranteed, after 72 hours, the thin coating is broken, and the soluble metal support ring 4 is rapidly dissolved.
As shown in fig. 1 and 3, the full-bore soluble sliding sleeve D/E/F comprises a sliding sleeve outer cylinder 10, a ball seat integrated soluble sliding sleeve mandrel 9 and a soluble ball 12, the ball seat integrated soluble sliding sleeve mandrel 9 and the sliding sleeve outer cylinder 10 are sealed by a second O-shaped sealing ring 7 and are fixed in the sliding sleeve outer cylinder 10 by a control shear pin 8, and a sand blasting hole 11 is arranged on the side wall of the sliding sleeve outer sleeve 10 and is opened and closed by the ball seat integrated soluble sliding sleeve mandrel 9.
As shown in fig. 1 and 4, the soluble sliding sleeve mandrel catcher B comprises a guide head 13, a catcher outer cylinder 14, a soluble metal support ring 15 and a sliding sleeve mandrel catcher inner core 18, wherein the sliding sleeve mandrel catcher inner core 18 is supported in the catcher outer cylinder 14 through the soluble metal support ring 15 and sealed through first and second soluble rubber O- ring seals 16 and 17, and the guide head 13 is connected to the lower end of the sliding sleeve mandrel catcher inner core 18 through a screw thread.
As shown in fig. 1 and 3-4, the lower outer wall of the ball seat integrated soluble sliding sleeve mandrel 9 in the full-bore soluble sliding sleeve D/E/F is matched with the structure of the upper inner wall of the sliding sleeve mandrel catcher inner core 18 in the soluble sliding sleeve mandrel catcher B, and a vulcanized rubber sealing ring 6 is sleeved on the lower outer wall of the ball seat integrated soluble sliding sleeve mandrel 9 for sealing the lower outer wall of the ball seat integrated soluble sliding sleeve mandrel 9 inserted into the upper inner wall of the sliding sleeve mandrel catcher inner core 18.
As an embodiment of the invention, taking 4-stage fracturing in a production casing of 5-1/2' as an example, as shown in figures 1-4, the fracturing method of the full-bore soluble sliding sleeve assembly multistage fracturing string for the separate-zone fracturing comprises the following steps:
(1) preparing a corresponding number of full-bore soluble sliding sleeve assemblies I/II/III according to the reservoir conditions of an oil-gas well, and assembling a soluble throttling bottom valve A, a corresponding number of the full-bore soluble sliding sleeve assemblies I/II/III, a K344 packer C, a sand-prevention hydraulic anchor G and a hydraulic safety joint H on an oil pipe I to form a fracturing string;
(2) the assembled fracturing string (soluble throttling bottom valve A +2-7/8 'oil pipe + soluble sliding sleeve mandrel catcher B + K344 packer C + 2-7/8' oil pipe + first stage full-bore soluble sliding sleeve D +2-7/8 'oil pipe + soluble sliding sleeve mandrel catcher B + K344 packer C + 2-7/8' oil pipe + second stage full-bore soluble sliding sleeve E +2-7/8 'oil pipe + soluble sliding sleeve mandrel catcher B + K344 packer C + 2-7/8' oil pipe + third stage full-bore soluble sliding sleeve F +2-7/8 'oil pipe + K344 packer C + 2-7/8' oil pipe + sand-preventing hydraulic anchor G +2-7/8 'oil pipe + hydraulic safety joint H + 2-7/8' oil pipe + tubing hanger + oil compensation distance) is put into the production casing J of the oil-gas well, enabling the sand blasting holes 11 of each stage of the full-bore soluble sliding sleeve D/E/F to correspond to the positions of the reservoir sections in the oil and gas wells;
(3) opening the sleeve valve to make the distance from the oil pipe I not greater than 0.5m3After 1 oil pipe I internal volume of pad fluid is circularly washed in a displacement of/min, the displacement is rapidly increased to 1.2m3Min, setting all K344 packers C when the differential pressure between the oil pipe I and the production casing J reaches 0.3-0.5 MPa;
(4) closing a sleeve valve, pumping a balanced pressure into an annular space of the oil pipe I and the production sleeve J by a surface pump truck, and performing fracturing construction on the 1 st layer through a soluble throttling bottom valve A;
(5) after the 1 st layer fracturing construction is finished, a soluble ball 12 with the size corresponding to the first-stage full-bore soluble sliding sleeve D is thrown into the fracturing string through a ball throwing plug valve of a wellhead, the soluble ball 12 falls onto a ball seat integrated soluble sliding sleeve mandrel 9 to form sealing, the pressure is suppressed to cut off a control shear pin 8 under the action of the liquid pressure in the oil pipe I, the soluble ball 12 drives the ball seat integrated soluble sliding sleeve mandrel 9 to descend, a sand blasting hole 11 is exposed to form a fracturing channel, meanwhile, the soluble ball 12 drives the ball seat integrated soluble sliding sleeve mandrel 9 to continuously descend, pass through a K344 packer C and fall onto a sliding sleeve mandrel catcher inner core 18 of a soluble sliding sleeve mandrel catcher B to form sealing, the 1 st layer is blocked, and the 2 nd layer is subjected to fracturing construction;
(6) applying the same construction method in the step (5) to finish the fracturing construction of the 3 rd to 4 th layers;
(7) after fracturing construction of all intervals is completed, a soluble metal support ring 4 in a soluble throttling bottom valve A, a soluble metal support ring 15, a first soluble rubber O-shaped sealing ring 16, a second soluble rubber O-shaped sealing ring 17 and soluble balls 12 in all stages of all-diameter soluble sliding sleeve assemblies I/II/III can be dissolved automatically in a fracturing flow-back liquid environment, after the parts are dissolved, a throttling valve core 3 in the soluble throttling bottom valve A, a ball seat integrated soluble sliding sleeve mandrel 9, a guide head 13, a sliding sleeve mandrel catcher inner core 18 and other parts in all-diameter soluble sliding sleeve assemblies I/II/III freely fall into an artificial well bottom under the action of self weight due to the fact that the parts are separated from the constraint of the soluble parts, and finally the whole fracturing string all-diameter soluble fracturing pipe is achieved.
It is to be noted and understood that various modifications and improvements can be made to the invention described in detail above without departing from the spirit and scope of the invention as claimed in the appended claims. Accordingly, the scope of the claimed subject matter is not limited by any of the specific exemplary teachings provided.
The applicants hereby give notice that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A full-drift diameter soluble sliding sleeve component multistage fracturing string for separate-layer fracturing is characterized in that the fracturing string comprises a soluble throttling bottom valve, a plurality of stages of full-drift diameter soluble sliding sleeve components, a K344 packer, a sand-prevention hydraulic anchor and a hydraulic safety joint which are sequentially connected from bottom to top, and all the tools are connected through oil pipes and are arranged in a production casing; the soluble sliding sleeve subassembly of full latus rectum of several levels includes that the soluble sliding sleeve of full latus rectum and soluble sliding sleeve dabber catcher of supporting use of setting up from top to bottom and supporting in several levels.
2. The multi-stage fracturing string of claim 1, wherein the soluble throttling bottom valve comprises:
the inner wall of the upper end of the bottom valve upper joint (1) is provided with a conical oil pipe internal thread, the bottom valve upper joint is connected with an oil pipe through the conical oil pipe internal thread and is arranged at the bottommost part of a fracturing pipe column, the inner wall of the lower end of the bottom valve upper joint is a first contact surface, and the outer wall of the lower end of the bottom valve upper joint is provided with an;
the inner wall of the upper end of the lower connector (5) of the bottom valve is provided with an internal thread, the internal thread is connected with an external thread of the outer wall of the lower end of the upper connector (1) of the bottom valve through the thread, the inner wall of the lower end of the internal thread of the inner wall of the upper end of the lower connector (5) of the bottom valve is a second contact surface, the inner wall of the lower end of the second contact surface is raised and forms a circle of limiting step, and the tail part of the;
the outer wall of the throttling valve core (3) is of a stepped plane structure, the outer wall of the upper end of the throttling valve core is matched with the first contact surface, the uppermost end of the outer wall is provided with an annular groove, the first O-shaped sealing ring (2) arranged in the annular groove is sealed with the first contact surface, the outer diameter of the outer wall of the lower end of the throttling valve core is smaller than that of the outer wall of the upper end, the outer wall of the lower end of the throttling valve core, the second contact surface and a limiting step form an annular cavity together, the upper end of the inner wall of the throttling valve core (3) is a horn-shaped large chamfer, the lower end of the inner wall is of;
the soluble metal support ring (4) is of an annular structure and is arranged in an annular cavity formed by the outer wall of the lower end of the throttle valve core (3), a second contact surface of the lower joint (5) of the bottom valve and the limiting step;
the inner diameter of a first contact surface of the bottom valve upper connector (1) is smaller than the inner diameter of a limit step of the bottom valve lower connector (5), the inner diameter of the limit step of the bottom valve lower connector (5) is smaller than the inner diameter of a second contact surface, and after the soluble metal support ring (4) is dissolved, the throttle valve core (3) is guaranteed to smoothly fall into a well bottom.
3. The full-bore soluble sliding sleeve assembly multistage for separate layer fracturing of claim 2The fracturing string is characterized in that the soluble metal support ring (4) is made of soluble magnesium-aluminum alloy, takes magnesium as a matrix and has the density of 1.8-2.0 g/cm3。
4. The multistage fracturing string with the full-bore soluble sliding sleeve component for the separate layer fracturing as claimed in claim 2, wherein the outer surface of the soluble metal support ring (4) is coated with a phenolic resin or modified phenolic resin thin coating, the thickness of the thin coating is 800-1000 μm, slow dissolution within 72 hours is guaranteed, the thin coating is broken after 72 hours, and the soluble metal support ring (4) is dissolved rapidly.
5. A fracturing method of a full-bore soluble sliding sleeve assembly multistage fracturing string for separate-layer fracturing is characterized by comprising the following steps:
(1) preparing a corresponding number of full-bore soluble sliding sleeve assemblies according to the reservoir conditions of an oil-gas well, and assembling a soluble throttling bottom valve, a corresponding number of the full-bore soluble sliding sleeve assemblies, a K344 packer, a sand-prevention hydraulic anchor and a hydraulic safety joint on an oil pipe to form a fracturing string;
(2) the assembled fracturing string is put into a production casing of an oil and gas well, so that the sand blasting holes of the full-bore soluble sliding sleeve in each stage of the full-bore soluble sliding sleeve assembly correspond to the positions of reservoir sections in the oil and gas well;
(3) opening the sleeve valve to make the distance from the oil pipe less than 0.5m3After 1 oil pipe internal volume of pad fluid is circularly washed in a displacement of/min, the displacement is rapidly increased to 1.2m3Min, setting all K344 packers when the differential pressure between the oil pipe and the production casing reaches 0.3-0.5 MPa;
(4) closing a sleeve valve, pumping a balance pressure into an annular space of an oil pipe and a production sleeve by a surface pump truck, and performing fracturing construction on the 1 st layer through a soluble throttling bottom valve;
(5) after the 1 st layer fracturing construction is finished, a soluble ball with the size corresponding to the first-stage full-bore soluble sliding sleeve is thrown into the fracturing string through a ball throwing plug valve of a wellhead, the pressure is suppressed to shear a control shear pin, a sand blasting hole is exposed to form a fracturing channel, the 2 nd layer is subjected to fracturing construction, and the 1 st layer is simultaneously blocked;
(6) applying the same construction method in the step (5) to finish the fracturing construction of the 3 rd to 4 th layer or the subsequent more intervals;
(7) after the fracturing construction of all intervals is completed, the soluble part in the fracturing string can be dissolved automatically in the fracturing flow-back fluid environment, and the insoluble part freely falls into the artificial shaft bottom under the self-weight action due to the constraint of the soluble part, so that the full drift diameter of the whole fracturing string is finally realized.
6. The method of fracturing a full bore soluble sliding sleeve assembly multistage fracturing string for separate zone fracturing of claim 5, wherein the fracturing string can achieve up to 7 stages of fracturing within a 5 "to 1/2" production casing.
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| CN117365316A (en) * | 2023-11-30 | 2024-01-09 | 大庆信辰油田技术服务有限公司 | Multilayer drainage and production pipe column for gas well |
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