CN104453784B - A kind of solvable ball seat multistage fracturing sliding sleeve of controllable type - Google Patents

A kind of solvable ball seat multistage fracturing sliding sleeve of controllable type Download PDF

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Publication number
CN104453784B
CN104453784B CN201410760692.XA CN201410760692A CN104453784B CN 104453784 B CN104453784 B CN 104453784B CN 201410760692 A CN201410760692 A CN 201410760692A CN 104453784 B CN104453784 B CN 104453784B
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CN
China
Prior art keywords
ball seat
solvable ball
solvable
barrel
soluble
Prior art date
Application number
CN201410760692.XA
Other languages
Chinese (zh)
Other versions
CN104453784A (en
Inventor
邵媛
赵振峰
付钢旦
王治国
赵广民
王在强
赵敏琦
薛晓伟
Original Assignee
中国石油天然气股份有限公司
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Priority to CN201410760692.XA priority Critical patent/CN104453784B/en
Publication of CN104453784A publication Critical patent/CN104453784A/en
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Publication of CN104453784B publication Critical patent/CN104453784B/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/14Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/06Sleeve valves

Abstract

The invention belongs to petroleum industry undergrounds to control technical field of tools, more particularly to a kind of solvable ball seat multistage fracturing sliding sleeve of controllable type, including outer barrel, low sleeve in outer barrel, the upper end of the low sleeve is equipped with solvable ball seat, the solvable ball seat outer surface is longitudinally equipped with two seals ring recess, and sealing ring is mounted in the two seals ring recess.Pit shaft reducing brings production, well logging and later stage power tool tripping in after the present invention solves the problems, such as pressure.Compared with prior art, ball seat can gradually dissolve over time after pressure, larger full-bore can be formed after dissolving in pit shaft, Oil & Gas Productivity can farthest be played, larger full-bore simultaneously, reduce normally log well to the later stage, the influence of the underground work such as well workover and later stage storey increase design measure, and avoid the risk and cost for boring abrading-ball seat.

Description

A kind of solvable ball seat multistage fracturing sliding sleeve of controllable type
Technical field
The invention belongs to petroleum industry undergrounds to control technical field of tools, and in particular to a kind of solvable ball seat of controllable type is multistage Fracturing sliding bush.
Background technology
Currently, domestic multilayer multistage fracturing reform mode mostly uses sliding sleeve class tool, set using stage differential style between sliding sleeves at different levels Meter, need to put into successively with the ball sealer of corresponding some the ascending sizes of place grade sliding sleeve come complete each section of sliding sleeve unlatching and With being isolated for section has been transformed, the ball sealer that ball seat is blocked after pressure returns row's mode by open flow and is discharged, and sliding sleeve, ball seat stay in underground, Latus rectum is smaller in final pit shaft, and conventional production logging and later stage underground operation tool tripping in there are risk it is big even can not under The problem of entering predetermined design position, if selection bores ball seat, drilling and grinding process risk is big, the period is long.
Invention content
The purpose of the present invention is overcome disadvantage present in existing oil/gas well multilayer multistage fracturing reform sliding sleeve tool.
For this purpose, the present invention provides a kind of solvable ball seat multistage fracturing sliding sleeve of controllable type, including outer barrel, it is set in outer barrel The upper end of low sleeve, the low sleeve is equipped with solvable ball seat, and the solvable ball seat outer surface is longitudinally equipped with two seals ring recess, institute It states in two seals ring recess and is mounted on sealing ring.
It is the exposed band of annular soluble material, the outer surface of the exposed band of annular soluble material between the two seals ring recess It is coated with molybdenum and tungsten alloy.
The two seals ring recess is about solvable ball seat center symmetric setting.
The solvable ball seat entrance face is the conical surface.
The solvable ball seat can pressure-bearing 70MPa.
The solvable ball seat and the annular exposed band of soluble material are aluminum alloy materials, by the aluminium of weight percent 85%, 5% Gallium-aluminium alloy, 5% Bi and 5% Cr composition.
Fracturing sliding bush tool of the present invention in addition to have current oil gas field similar tools performance other than, be also equipped with as Lower advantage:
1, ball seat can gradually dissolve over time after pressing, and can form larger full-bore after dissolving in pit shaft, can be maximum Play Oil & Gas Productivity to degree.
2, larger full-bore, reduce normally log well to the later stage, the underground work such as well workover and later stage storey increase design measure Influence.
3, the risk and cost for boring abrading-ball seat is avoided.
It is described in further details below in conjunction with attached drawing.
Description of the drawings
Fig. 1 is the structural schematic diagram of multistage sliding sleeve;
Fig. 2 is the solvable ball seat sectional view of controllable type;
Fig. 3 is that the solvable ball seat multistage fracturing sliding sleeve of controllable type throws opening state schematic diagram after ball sealer;
Fig. 4 is status diagram after the solvable ball seat multistage fracturing sliding sleeve tee dissolving of controllable type;
Fig. 5 is the fracturing string schematic diagram of the solvable ball seat multistage fracturing sliding sleeve of controllable type and open hole packer composition.
In figure:1, top connection;2, outer barrel;3, lower contact;4, solvable ball seat;5, low sleeve;6, anticreep pin;7, sealing ring Slot;8, pressure break port;9, the exposed band of annular soluble material;10, locking ring;11, screen casing;12, float collar;13, pressure difference sliding sleeve;14、 Second segment open hole packer;15, section of two solvable ball seat fracturing sliding bush;16, third section open hole packer;17, third section is solvable Ball seat fracturing sliding bush;18, the 4th section of open hole packer;19, the 4th section of solvable ball seat fracturing sliding bush;20, interfacing part is inserted into sealing; 21, ball sealer;22, shear pin.
Specific implementation mode
Embodiment 1:
In order to overcome disadvantage present in existing oil/gas well multilayer multistage fracturing reform sliding sleeve tool:Latus rectum in pit shaft after pressure Smaller, if boring ball seat, drilling and grinding process risk is big.Present embodiments provide a kind of solvable ball of controllable type as shown in Figure 1, 2 The upper end of 4 multistage fracturing sliding sleeves of seat, including outer barrel 2, the low sleeve 5 being set in outer barrel 2, low sleeve 5 is equipped with solvable ball seat 4; 2 both ends of outer barrel of the multistage sliding sleeve of solvable ball seat 4 are connected through a screw thread with top connection 1 and lower contact 3 respectively, and the bottom of thread uses Anticreep pin 6 is fixed, two seals sealing, and 2 top barrel of outer barrel is equipped with pressure break port 8, and 8 lower section of pressure break port, which is equipped with, cuts Nail hole is equipped with shear pin 22;Low sleeve 5 is fixed by shear pin 22 and outer barrel 2, for blocking pressure break port 8, is glided It covers 5 lower parts and is designed with 10 slot of locking ring, locking ring 10 is housed, resetted again after being opened for anti-anti-skid sheath.
Solvable ball seat 4 is close to the installation of 5 upper end of low sleeve, and 4 outer surface of solvable ball seat is longitudinally equipped with two seal grooves 7, peace Fill two seals, solvable ball seat 4 is for the corresponding ball sealer of grade where seat 21.When well head pressurizes, ball sealer 21 pushes Low sleeve 5 moves down, and opens pressure break port 8.
The principle and the course of work of the present embodiment are as follows:
Ball sealer 21 is put into outer barrel 2, ball sealer 21 is fallen on solvable ball seat 4, blocks 4 central passage of solvable ball seat. Under hydraulic action, shear pin 22 is cut, solvable ball seat 4 under thrust, with sliding sleeve 5, locking ring 10 together to Lower movement.After low sleeve 5 is blocked by lower contact 3, locking ring 10 meets major diameter pop-up, and low sleeve 5 is locked on outer barrel 2. Solvable ball seat 4 moves down, and moves to major diameter, comes into contact with liquid, meets water soluble, in 70 DEG C of water, ensures pressure-bearing and pressure break in 5 hours Demand is completely dissolved in 15 days, and as soluble end is gradually expanded, solvable ball seat 4 is scattered, until being completely dissolved, tubing string in well Form larger full-bore.
Embodiment 2:
On the basis of embodiment 1,2 both ends of outer barrel of multistage sliding sleeve pass through screw thread with top connection 1 and lower contact 3 respectively Connection, the bottom of thread are fixed using anticreep pin 6, and two seals sealing, 2 top barrel of outer barrel is equipped with pressure break port 8, pressure It splits 8 lower section of port and is equipped with shear pin hole, shear pin 22 is housed;Low sleeve 5 is fixed by shear pin 22 and outer barrel 2, for sealing Stifled pressure break port 8,5 lower part of low sleeve are designed with 10 slot of locking ring, and locking ring 10 is housed, multiple again after being opened for anti-anti-skid sheath Position.
Solvable ball seat 4 is close to the installation of 5 upper end of low sleeve, and 4 outer surface of solvable ball seat is longitudinally equipped with two seal grooves 7, peace Two seals are filled, form the exposed band 9 of annular soluble material between two seals ring recess 7, the exposed band of the annular soluble material 9 Outer surface is coated with molybdenum and tungsten alloy, the design of the 4 entrance face conical surface of solvable ball seat, for the corresponding ball sealer of grade where seat 21.Work as well When mouth pressurization, ball sealer 21 pushes low sleeve 5 to move down, and opens pressure break port 8.The outer surface of the exposed band of soluble material is coated with molybdenum Tungsten alloy can further increase the intensity and bearing capacity of solvable ball seat 4, make sliding sleeve entirety pressure-bearing 70MPa or more.
Before pressure break, the annular exposed band 9 of soluble material is between two seals, and low sleeve 5 moves down, annular soluble material Exposed band 9 moves to major diameter, comes into contact with well liquid, starts to dissolve, and soluble end is gradually expanded ball seat and is scattered, until be completely dissolved, Tubular is at larger full-bore in well.
Embodiment 3:
On the basis of embodiment 2, two seals ring recess 7 makes pressure-bearing stress about 4 center symmetric setting of solvable ball seat Balance, while ball seat dissolving synchronizes, larger full-bore is faster realized in guarantee.
As shown in figure 3, putting into ball sealer 21 in outer barrel 2, ball sealer 21 is fallen on solvable ball seat 4, blocks solvable ball seat 4 Central passage.Under hydraulic action, shear pin 22 is cut, and solvable ball seat 4 is under thrust, with sliding sleeve 5, locking ring 10 move downwardly together.After low sleeve 5 is blocked by lower contact 3, locking ring 10 meets major diameter pop-up, and low sleeve 5 is locked in On outer barrel 2.Solvable ball seat 4 moves down, and moves to major diameter, since solvable ball seat 4 and the exposed band of annular soluble material 9 are aluminium alloy Material is made of the Cr of the aluminium of weight percent 85%, 5% gallium-aluminium alloy, 5% Bi and 5%, when coming into contact with liquid, meets water It is solvable, in 70 DEG C of water, ensures pressure-bearing and pressure break demand in 5 hours, be completely dissolved in 15 days.As shown in figure 4, with dissolving model It encloses and is gradually expanded, solvable ball seat 4 is scattered, and solvable ball seat 4 is completely dissolved, and tubular is at larger full-bore in well.
Fig. 5 is four sections of segmentation pressures of a kind of horizontal well open hole packer that the solvable 4 multistage fracturing sliding sleeve of ball seat of controllable type uses Tubing string is split, more multistage can be increased to according to FRACTURING DESIGN needs or reduces hop count.By shaft bottom to well head sequence successively by screen casing 11, the solvable ball seat fracturing sliding bush 15 of float collar 12, pressure difference sliding sleeve 13, second segment open hole packer 14, second segment, third section bore hole envelope Every device 16, the solvable ball seat fracturing sliding bush 17 of third section, the 4th section of open hole packer 18, the 4th section of solvable ball seat fracturing sliding bush 19 Interfacing part 20 is inserted into hanger with sealing to form, sealing is inserted into interfacing part 20 from bottom to up successively by hanging packer, tieback Cylinder, sealing intubation composition, hanging packer are coupled with tie-back sleeve using button, there is gingival cyst of mucous gland in the newborn button, sealing intubation lower end inside tie-back sleeve There are gingival cyst of mucous gland in the newborn button, sealing ring in outside;Sealing intubation lower end is inserted into tie-back sleeve, and gingival cyst of mucous gland in the newborn button mutually locking, sealing ring sealing are passed through.It is outstanding It is existing component to hang packer, tie-back sleeve, sealing intubation.
When open-hole horizontal well bores, complete, drifting after, with being sent into tubing string(Drilling rod)Solvable 4 fracturing sliding bush of the ball seat segmentation pressure of tripping in Process pipe string is split, is set after open hole packer, hanging packer, tubing string give up, by the feeding tubing string of straight well section(Drilling rod)It replaces For fracturing string.After pressure testing qualification, well head puts into the pressing crack construction that different size of ball sealer 21 completes each interval.
When pressure break, 13 completion first segment pressure break of pressure difference sliding sleeve is opened by improving well head pressure, puts into smaller ball sealer 21 It opens the solvable ball seat fracturing sliding bush 15 of second segment and blocks first segment and complete second segment pressure break, input and the mating sealing of third section Ball 21 opens the solvable ball seat fracturing sliding bush 17 of third section and blocks first, second section, completes third section pressure break, and so on completion Multistage pressing crack construction.After the completion of pressure break, open flow returns row directly production, 10 days or so Quan Jing solvable ball seats 4 at different levels and is scattered, and 15 days complete Fully dissolved, down-hole string form larger full-bore.
The open hole packer of big orifice can be kept to be applicable not only to open hole packer horizontal well with applying mechanically novel sliding sleeve after pressure Pressure break, it can also be used to other sliding sleeve class fracturing without pulling string.
Pit shaft reducing brings production, well logging and later stage power tool tripping in after the present invention solves the problems, such as pressure.With it is existing There is technology to compare, ball seat can gradually dissolve over time after pressure, can form larger full-bore after dissolving in pit shaft, can be maximum Play to degree Oil & Gas Productivity, while larger full-bore, reduce normally log well to the later stage, well workover and later stage storey increase design The influence of the underground work such as measure, and avoid the risk and cost for boring abrading-ball seat.
The well-known components and common structure of the component and the structure category industry that the present embodiment does not describe in detail or common hand Section, does not describe one by one here.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all Be with the present invention it is same or analogous design all belong to the scope of protection of the present invention within.

Claims (1)

1. a kind of solvable ball seat multistage fracturing sliding sleeve of controllable type, including outer barrel(2), it is set to outer barrel(2)Interior low sleeve(5), It is characterized in that:The outer barrel(2)Top barrel is equipped with pressure break port(8), pressure break port(8)Lower section is equipped with shear pin hole, equipped with cutting Cut pin(22);Low sleeve(5)By shear pin(22)With outer barrel(2)It is fixed, for blocking pressure break port(8), low sleeve(5) Lower part is designed with locking ring(10)Slot is equipped with locking ring(10), resetted again after being opened for anti-anti-skid sheath;The low sleeve (5)Upper end be equipped with solvable ball seat(4), the solvable ball seat(4)Outer surface is circumferentially with two seals ring recess(7), described two Road seal groove(7)Inside it is mounted on sealing ring;The two seals ring recess(7)Between be the exposed band of annular soluble material(9), The exposed band of annular soluble material(9)Outer surface be coated with molybdenum and tungsten alloy;The two seals ring recess(7)About solvable ball seat (4)Center symmetric setting;The solvable ball seat(4)Entrance face is the conical surface;The solvable ball seat(4)It can pressure-bearing 70MPa;It is described Solvable ball seat(4)With the exposed band of annular soluble material(9)It is aluminum alloy materials, by the aluminium of weight percent 85%, 5% gallium- Aluminium alloy, 5% Bi and 5% Cr composition;Before pressure break, the annular exposed band of soluble material is between two seals, low sleeve It moves down, the annular exposed band of soluble material moves to major diameter, comes into contact with well liquid, starts to dissolve, and soluble end is gradually expanded ball seat and dissipates It falls, until being completely dissolved, tubular is at larger full-bore in well;
The course of work:Ball sealer is put into outer barrel, ball sealer is fallen on solvable ball seat, blocks solvable ball seat central passage; Under hydraulic action, shear pin is cut, and solvable ball seat moves under thrust with low sleeve, locking ring downwardly together;When After low sleeve is blocked by lower contact, locking ring meets major diameter pop-up, and low sleeve is locked on outer barrel;Solvable ball seat moves down, and moves to Major diameter, comes into contact with liquid, meets water soluble, in 70 DEG C of water, ensures pressure-bearing and pressure break demand in 5 hours, completely molten in 15 days Solution, as soluble end is gradually expanded, solvable ball seat is scattered, until being completely dissolved, tubular is at larger full-bore in well.
CN201410760692.XA 2014-12-12 2014-12-12 A kind of solvable ball seat multistage fracturing sliding sleeve of controllable type CN104453784B (en)

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US9587464B2 (en) * 2014-10-02 2017-03-07 Sc Asset Corporation Multi-stage liner with cluster valves and method of use
CN106481311A (en) * 2015-08-27 2017-03-08 中国石油化工股份有限公司 Ball-throwing type sliding sleeve and fracturing string
CN105298461B (en) * 2015-11-03 2017-09-26 东北石油大学 The unlimited solvable ball fracturing sliding bush of full-bore
CN105672943B (en) * 2016-01-20 2018-07-10 中国石油化工股份有限公司 A kind of full-bore sliding sleeve with solvable solution structure
CN105937383B (en) * 2016-06-20 2018-09-04 中国石油天然气股份有限公司 A kind of soluble type full-bore ball seat seating nipple
CN108999591A (en) * 2017-06-06 2018-12-14 中国石油天然气股份有限公司 A kind of fracturing sliding bush
CN109209317B (en) * 2017-07-04 2021-02-26 中国石油化工股份有限公司 Fracturing nipple and fracturing pipe string comprising same
CN109209318A (en) * 2017-07-04 2019-01-15 中国石油化工股份有限公司 A kind of fracturing sliding bush and the fracturing string comprising it
CN109209319A (en) * 2017-07-04 2019-01-15 中国石油化工股份有限公司 A kind of fracturing sliding bush and the fracturing string comprising it
CN110306959A (en) * 2018-03-20 2019-10-08 中国石油天然气股份有限公司 Fracturing sliding bush
CN109252845A (en) * 2018-10-15 2019-01-22 中国石油集团渤海钻探工程有限公司 A kind of solvable slide bushing assembly of separate stratum fracfturing full-bore

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