WO2016161904A1 - 球座可取式投球滑套 - Google Patents

球座可取式投球滑套 Download PDF

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Publication number
WO2016161904A1
WO2016161904A1 PCT/CN2016/077368 CN2016077368W WO2016161904A1 WO 2016161904 A1 WO2016161904 A1 WO 2016161904A1 CN 2016077368 W CN2016077368 W CN 2016077368W WO 2016161904 A1 WO2016161904 A1 WO 2016161904A1
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WO
WIPO (PCT)
Prior art keywords
sliding sleeve
ball seat
sleeve
ball
ring
Prior art date
Application number
PCT/CN2016/077368
Other languages
English (en)
French (fr)
Inventor
张胜鹏
李晓军
高飞
王飞跃
张昕
李富强
Original Assignee
中国石油集团西部钻探工程有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中国石油集团西部钻探工程有限公司 filed Critical 中国石油集团西部钻探工程有限公司
Publication of WO2016161904A1 publication Critical patent/WO2016161904A1/zh
Priority to US15/727,652 priority Critical patent/US10494901B2/en

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Classifications

    • 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
    • E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
    • 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
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/06—Sleeve valves

Definitions

  • the invention relates to the technical field of fracturing sliding sleeves, and relates to a spherical ball-receivable throwing sliding sleeve.
  • Fracturing completion is a common technical method used in completion operations.
  • the fracturing sleeve is usually used, and the fracturing channel connecting the inner and outer annulus is opened by the method of pitching and rolling.
  • the fracturing sliding sleeves that are currently used are mostly unsatisfactory sliding sleeves, and are limited by the internal spherical seat. Once the underground complicated conditions such as underground water discharge occur, it is difficult to handle; there is a problem of post-processing difficulties.
  • the invention provides a ball seat-selectable ball-sliding sleeve, which overcomes the above-mentioned deficiencies of the prior art, and can effectively solve the fracturing completion by using the fracturing sleeve, because the fracturing sleeve is not suitable and the internal ball seat is restricted. There are problems in the later processing of complex situations.
  • a ball seat selectable ball-sliding sleeve comprising an outer cylinder, an inner sliding sleeve and a desirable ball seat assembly; an inner ring platform at an upper end of the outer cylinder, at a lower end of the outer cylinder
  • the inner joint is provided with a lower joint, a sliding groove is formed in the outer cylinder between the inner ring base and the lower joint, and at least one fracturing side hole is distributed on the outer circumference of the outer cylinder on the upper side of the sliding groove, in the sliding groove
  • An inner sliding sleeve capable of sealing the side hole of the fracture is installed in the upper part, and the inner sliding sleeve is fixedly mounted with the outer cylinder through the first shear pin; the unseal sliding distance between the lower end and the lower joint of the inner sliding sleeve
  • a removable ball seat assembly that can be extracted by the upper sliding sleeve is installed in the inner sliding sleeve.
  • the above-mentioned preferred ball seat assembly may include a ball seat cover, a connecting sleeve, a limiting cylinder, a ball seat and a second shear pin; at least two elastic claw pieces capable of radially expanding and contracting are fixed on the circumference of the upper end of the ball seat cover, at each The upper ends of the elastic claw pieces are respectively provided with a hanging outer card table, and an inner card slot is arranged in the middle of the inner sliding sleeve; in the ball seat cover, the second shear pin is fixedly connected to support the elastic claw piece outwardly.
  • a connecting sleeve the outer card is suspended in the inner card slot, and the lower part of the ball seat cover is set in the lower joint;
  • the outer ring surface of the connecting sleeve on the lower side of the hanging outer card table is provided with a claw collecting groove;
  • the claw piece is gathered
  • An outer ring table is arranged on the connecting sleeve on the lower side of the groove, and a ring groove with an opening downward is formed between the connecting sleeve at the lower end of the outer ring base and the ball seat cover, and a limit inner card seat is arranged in the middle of the ball seat cover, and the limit is within the limit
  • the card table is located in the upper side of the ring groove;
  • the limit tube is fixed on the outer side of the lower end of the connecting sleeve, and the upper part of the limiting tube is located in the lower side of the ring groove; between the lower end of the limiting plate and the upper end of the limiting tube Connection sleeve Lifting and
  • the outer lower end of the ball seat may be provided with an externally threaded boss, and the ball seat is fixedly mounted on the lower side of the ball seat cover by the external thread boss; the upper end of the external thread boss forms an opening between the ball seat and the ball seat cover
  • a pressure relief hole is formed on the circumference of the ball seat for connecting the ball seat and the ball seat ring groove.
  • a retaining device for the upper end of the connecting sleeve can be installed between the outer ring table and the ball seat cover;
  • the stopping device includes a retaining ring, and a mounting groove is arranged in the middle of the outer ring surface of the outer ring table.
  • a retaining ring is mounted therein, and an outer ring-shaped outer ring claw is arranged on the outer ring surface of the retaining ring, and the inner ring surface of the ball seat sleeve is longitudinally distributed with an inner oblique direction and can be externally
  • the ratchet groove of the ring claw table is engaged, the outer end of the outer ring claw table is stuck in the ratchet groove;
  • the lower connector is fixedly mounted in the ball seat cover at the lower end of the ball seat, and the lower connector is in the shape of a cylinder, in the lower part of the lower connector
  • the circumference is distributed with a notch, and the lower joint is divided into at least two connecting claw pieces, and the outer obliquely upwardly extending hook teeth are longitudinally spaced apart on the outer side of the connecting claw piece; the longitudinal spacing is distributed in the upper side of the connecting sleeve A hook groove in which the hook teeth are engaged with each other.
  • the lower part of the inner sliding sleeve may be circumferentially distributed with a long groove, and the inner sliding sleeve is divided into at least two sliding sleeve springs having an arc shape; the sliding sleeve is arranged outside the lower part of the sliding sleeve spring, and the sliding sleeve card is provided.
  • the upper guide rail of the block forms an upper and lower narrow lead-in frustum
  • the lower guide rail of the sliding sleeve block forms an upper wide and a narrow lead-out frustum
  • the inner wall of the outer cylinder corresponding to the sliding sleeve block is provided with a fracturing side
  • the upper limit card slot of the hole blocking limit, the sliding sleeve block is stuck in the upper limit card slot
  • the lower limit card slot for the fracture side hole opening limit is arranged on the outer cylinder below the upper limit card slot.
  • a sealing ring may be respectively fixedly mounted between the inner sliding sleeve and the outer cylinder above and below the fracturing side hole; at least one sealing ring is longitudinally fixed between the connecting sleeve above the ball seat cover and the inner sliding sleeve; A sealing ring is fixedly mounted between the inner sliding sleeve and the outer cylinder at the top of the sheet; a sealing ring is fixedly mounted between the lower joint and the outer cylinder; and a sealing ring is fixedly mounted between the outer side of the upper end of the ball seat and the inner side of the lower end of the limiting cylinder.
  • the elastic claw piece at the suspension outer card table may be respectively provided with a horizontal threaded hole, and the inner sliding sleeve corresponding to the threaded hole has a positioning tool hole.
  • the structure of the invention is reasonable and compact, and is convenient to use; the coiled tubing can be used to extract the connecting sleeve, the ball seat cover and the ball seat inside the inner sliding sleeve, thereby increasing the width of the inner passage of the sliding sleeve without being restricted by the inner diameter of the spherical seat, which is convenient.
  • Late complex processing the pressure relief hole on the ball seat and the pressure relief channel formed by the ball seat ring groove can release the pressure and facilitate lifting; the lower connector and the ball seat sleeve matched by the hook tooth and the hook groove can be more
  • the frustum sleeves of the fracturing sleeves are connected end to end, and are taken out in the well for convenient operation.
  • Figure 1 is a schematic front elevational cross-sectional view of a preferred embodiment of the present invention.
  • FIG. 2 is a schematic view showing the structure of the ball-seatable ball-sliding sleeve of the present invention.
  • FIG. 3 is a schematic view showing the structure of the side hole of the fracture after the seat ball is put into the spherical ball sleeve of the present invention.
  • FIG. 4 is a schematic structural view of the upper ball-receiving ball seat assembly after the ball-seatable ball-sliding sleeve of the present invention is lowered into the connecting pipe.
  • FIG. 5 is a structural schematic view of a ball-seatable ball-sliding sleeve pressing connection sleeve of the present invention.
  • the codes in the drawings are: 1 is the outer cylinder, 2 is the inner ring table, 3 is the lower joint, 4 is the slip groove, 5 is the fracture side hole, 6 is the inner sliding sleeve, 7 is the ball seat cover, 8
  • 9 is the hanging outer card table
  • 10 is the connecting sleeve
  • 11 is the claw piece collecting groove
  • 12 is the outer ring table
  • 13 is the limit inner card table
  • 14 is the limit tube
  • 15 is the ball seat
  • 16 is an externally threaded boss
  • 17 is a ball seat ring groove
  • 18 is a pressure relief hole
  • 19 is a lower connector
  • 20 is a connecting claw piece
  • 21 is a hook tooth
  • 22 is a retreating ring
  • 23 is a sliding sleeve spring.
  • 24 is a sliding sleeve
  • 25 is a lower limit card slot
  • 26 is a sealing ring
  • 27 is a first shear pin
  • 28 is a second shear pin
  • 29 is a threaded hole
  • 30 is a positioning tool hole.
  • the ball seat type ball-sliding sleeve includes an outer tube 1, an inner sliding sleeve 6, and a removable ball seat assembly;
  • the upper end of the cylinder 1 is provided with an inner ring table 2, and a lower joint 3 is fixedly mounted in the lower end of the outer cylinder 1, and a sliding groove 4 is formed in the outer cylinder 1 between the inner ring base 2 and the lower joint 3, in the sliding groove 4 at least one fracturing side hole 5 is disposed on the upper circumference of the outer cylinder 1 on the upper side, and an inner sliding sleeve 6 capable of sealing the fracture side hole 5 is installed in the upper portion of the sliding groove 4, and the inner sliding sleeve 6 passes through
  • a shear pin 27 is fixedly mounted with the outer cylinder 1; a gap between the lower end of the inner sliding sleeve 6 and the lower joint 3 is unsealed; and the inner sliding sleeve 6 is provided with a removable spherical seat that can be extracted by the upper sliding cylinder
  • the first shear pin 27 is cut, the inner sliding sleeve 6 is descended, and the fracturing passage is opened by opening the fracture side hole 5; after the fracturing passage is opened, it can be utilized
  • the coiled tubing is lowered into the optional ball seat assembly, and the available ball seat assembly is taken out; the internal passage of the sliding sleeve is widened without being limited by the inner diameter of the ball seat, so that some large-diameter size detection and repair tools can be easily slipped through the sleeve Into the well, to deal with downhole complex conditions such as downhole water; simple operation, solve the problem of post-processing operations in fracturing wells, thus ensuring the effective implementation of downhole operations.
  • the above-mentioned ball-seatable ball-sliding sleeve can be further optimized or/and improved:
  • the available ball seat assembly includes a ball seat cover 7, a connecting sleeve 10, a limiting barrel 14, a ball seat 15 and a second shear pin 28; at least two can be fixed on the circumference of the upper end of the ball seat cover 7
  • the radially extending elastic claw pieces 8 are respectively provided with a hanging outer card table 9 at the upper end of each elastic claw piece 8, an inner card slot in the middle of the inner sliding sleeve 6, and a second shearing in the ball seat cover 7
  • the cutting pin 28 is fixedly connected with a connecting sleeve 10 capable of supporting the elastic claw piece 8 outwardly.
  • the hanging outer card table 9 is stuck in the inner card slot, and the lower part of the ball seat cover 7 is set in the lower joint 3; 9 the lower side of the connecting sleeve 10 is provided with a claw collecting groove 11 on the outer ring surface; the outer ring base 12 is provided on the connecting sleeve 10 on the lower side of the claw collecting groove 11, and the connecting sleeve 10 at the lower end of the outer ring base 12 Forming an open downward ring groove with the ball seat cover 7, and a limiting inner card table 13 is disposed in the middle of the ball seat cover 7, and the limiting inner card table 13 is located in the upper side of the ring groove; outside the lower end of the connecting sleeve 10
  • the fixed limit cylinder 14 is fixed, and the upper part of the limiting cylinder 14 is located in the lower side of the annular groove; between the lower end of the limiting table 13 and the upper end of the limiting cylinder 14, the connecting sleeve 10 can be lifted up and the ball seat cover 7 can be solved.
  • the longitudinal moving pitch is larger than the distance between the top end of the hanging outer card table 9 and the top end of the claw collecting groove 11, that is, the elastic claw piece 8 can be hidden in the claw collecting groove 11;
  • the lower side of the seventh side is fixedly mounted with a ball seat 15, and the lower end of the limiting tube 14 is sealed on the outer side of the ball seat 15.
  • the coiled tubing 28 is cut by the coiled tubing, and the connecting sleeve 10 is ascended with the connecting oil pipe; in the process, when the claw collecting groove 11 is moved up to the hanging outer chuck 9, the upper portion of the elastic claw piece 8 is radially contracted.
  • the outer card table 9 is untied, and the ball seat cover 7 is disengaged from the inner sliding sleeve 6;
  • the lower limit cylinder 14 is placed at the bottom of the limit table 13 in the limit position, and drives the ball seat cover 7 and the bottom portion.
  • the ball seat 15 is lifted together with the connecting sleeve 10, and the ball seat 15 is taken out from the well; the operation is simple and convenient, and the connecting sleeve 10, the ball seat cover 7 and the ball seat 15 which are internally connected are all taken out without affecting the opening of the channel.
  • Increase the width of the inner channel of the sliding sleeve so that some large-diameter size detection and repair tools can be sent into the well through the sliding sleeve.
  • the outer lower end of the ball seat 15 is provided with an externally threaded boss 16, and the ball seat 15 is screwed and fixed to the lower side of the ball seat cover 7 by the externally threaded boss 16; the ball at the upper end of the externally threaded boss 16
  • An open upper spherical ring groove 17 is formed between the seat 15 and the ball seat cover 7; the lower side of the limiting cylinder 14 is sealed and installed in the ball seat ring groove 17 outside the ball seat 15; the inner side of the ball seat 15 is provided with an upper end
  • a ball-and-cone frustum having a narrow width and a narrow width is provided with a pressure relief hole 18 that allows the ball seat 15 to communicate with the ball seat ring groove 17 on the circumference of the ball seat 15 on the lower side of the ball frustum.
  • the limiting cylinder 14 connected at the bottom thereof is disengaged from the ball seat 15, and the pressure relief passage formed by the ball seat ring groove 17 and the pressure releasing hole 18 connects the sliding sleeve inner cavity of the upper and lower sides of the ball seat 15 to release the pressure. For easy handling.
  • a retaining device for the upper stop of the connecting sleeve 10 is mounted between the outer ring table 12 and the ball seat cover 7;
  • the retaining device includes a retracting split ring 22, and the outer ring of the outer ring base 12
  • a mounting groove is arranged in the middle of the surface, a retaining ring 22 is mounted in the mounting groove, and an outer ring claw is provided on the outer ring surface of the retaining ring 22 in the outer ring of the ball sleeve 7
  • a ratchet groove which is obliquely upward and engages with the outer ring claw table is longitudinally distributed on the surface, and the outer end of the outer ring claw is caught in the ratchet groove;
  • the ball seat cover 7 at the lower end of the ball seat 15 is fixedly mounted
  • the lower connector 19 has a cylindrical shape, a notch is distributed around the lower circumference of the lower connector 19, and the lower connector 19 is divided into at least two connecting claws 20, which are longitudinally spaced apart on the outer side of
  • hook teeth 21 which are outwardly inclined upward; and a hook groove which can be engaged with the hook teeth 21 is longitudinally spaced apart in the upper side of the connecting sleeve 10.
  • the hook teeth 21 on the outer side of the lower joint 19 and the hook groove structure on the upper side of the joint sleeve 10 are commonly referred to as a horse buckle structure; in order to facilitate the removal of the ball seat 15, a lower joint 19 can be fixed at the lower end of the coiled tubing, and When the connecting head 19 can be directly inserted into the upper side of the connecting sleeve 10, the hook teeth 21 can be engaged in the hook groove to realize the connection between the connecting sleeve 10 and the connecting oil pipe, and the operation is convenient; in addition, multiple fracturing is required for the need.
  • the lower connecting head 19 installed at the lower end of each ball seat cover 7 can be utilized; after the connecting sleeve 10 is lifted up, the connecting sleeve 10 is pressed down, as shown in FIG.
  • the retaining ring 22 acts, and the ball seat cover 7 and the lower connecting head 19 are connected to each other in the connecting sleeve 10 of the lower sliding sleeve of the connecting sleeve 10; by this means, the plurality of fracturing sliding sleeves of the well can be taken After the ball and socket assembly is connected end to end, it is extracted together to solve the problem that the ball seat 15 of the plurality of fracturing sleeves is taken out, and the operation is convenient.
  • a long groove is distributed around the lower circumference of the inner sliding sleeve 6, and the inner sliding sleeve 6 is divided into at least two sections.
  • the lower guide rail of the 24 forms an upper and lower narrowing lead frustum;
  • the inner wall of the outer cylinder 1 corresponding to the sliding sleeve block 24 is provided with an upper limit card slot for fracturing the side hole 5 to block the limit position, and the sliding sleeve block 24 is stuck in the upper limit card slot;
  • the outer cylinder 1 below the upper limit card slot is provided with a lower limit card slot 25 for fracturing the side hole 5 opening limit.
  • the table is compressed inward by the reverse thrust of the lower end of the upper limit card slot, so that the sliding sleeve 24 is disengaged from the upper limit card slot and descends with the inner sliding sleeve 6; while the fracture side hole 5 is opened, the sliding sleeve is opened.
  • the block 24 is moved to the lower limit card slot 25 and is caught in the lower limit card slot 25 to limit the inner sliding sleeve 6 in the open state, thereby preventing the inner sliding sleeve 6 from returning.
  • a sealing ring 26 is fixedly mounted between the inner sliding sleeve 6 and the outer cylinder 1 above and below the fracturing side hole 5; between the connecting sleeve 10 above the ball seat sleeve 7 and the inner sliding sleeve 6 Longitudinally fixedly mounting at least one sealing ring 26; a sealing ring 26 is fixedly mounted between the inner sliding sleeve 6 and the outer cylinder 1 above the sliding sleeve spring 23; a sealing ring 26 is fixedly mounted between the lower joint 3 and the outer cylinder 1; A seal ring 26 is fixedly mounted between the outer side of the upper end of the ball seat 15 and the inner side of the lower end of the limit cylinder 14. The seal ring 26 serves to increase the sealing of the contact surface.
  • the elastic claw pieces 8 at the outer card table 9 are respectively provided with horizontal threaded holes 29, and the inner sliding sleeve 6 corresponding to the threaded holes 29 has positioning tool holes 30.
  • the elastic claw piece 8 can be first fixed to the inner sliding sleeve 6 by screws, and then the connecting sleeve 10 is installed inside the ball seat cover 7, so that the elastic claw piece can be prevented during the tooling. 8 is inside and interferes with the connecting sleeve 10 to facilitate assembly; after assembly, the screw can be screwed out from the positioning tooling hole 30.

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  • Engineering & Computer Science (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
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Abstract

一种球座可取式投球滑套，包括外筒(1)、内滑套(6)和可取球座组件。外筒(1)的上端设有内环台(2)，外筒(1)的下端内固定安装有下接头(3)，在内环台(2)与下接头(3)之间的外筒(1)内形成滑移槽(4)，在滑移槽(4)上侧的外筒(1)上圆周分布有至少一个压裂侧孔(5)。该滑套结构合理而紧凑，使用方便。利用连续油管，能够将连接套(10)、球座套(7)和球座(15)从内滑套(6)提取出，增大滑套内部通道宽度，不受球座(15)内径限制，方便后期复杂状况处理。球座(15)上的泄压孔(18)和球座环槽(17)形成的泄压通道，能够释放压力，方便上提。

Description

球座可取式投球滑套 技术领域
本发明涉及压裂滑套技术领域，是一种球座可取式投球滑套。
背景技术
压裂完井，是完井作业中十分常用的一种技术手段；实施压裂完井时，通常会利用压裂滑套，采用投球蹩压的方式，将连接内外环空的压裂通道开启；现采用的压裂滑套多为不可取的滑套，同时受到其内部球座限制，一旦发生井下出水等井下复杂状况，很难处理；存在后期处理困难的问题。
发明内容
本发明提供了一种球座可取式投球滑套，克服了上述现有技术之不足，其能有效解决利用压裂滑套实施压裂完井，因压裂滑套不可取及内部球座限制，存在后期复杂状况处理困难的问题。
本发明的技术方案是通过以下措施来实现的：一种球座可取式投球滑套，包括外筒、内滑套和可取球座组件；在外筒的上端设有内环台，在外筒的下端内固定安装有下接头，在内环台与下接头之间的外筒内形成滑移槽，在滑移槽上侧的外筒上圆周分布有至少一个压裂侧孔，在滑移槽的上部内安装有能将压裂侧孔封堵的内滑套，内滑套通过第一剪切销钉与外筒固定安装在一起；内滑套的下端与下接头之间有解封滑移间距；在内滑套内安装有能通过上提取出的可取球座组件。
下面是对上述发明技术方案的进一步优化或/和改进：
上述可取球座组件可包括球座套、连接套、限位筒、球座和第二剪切销钉；在球座套的上端圆周固定有至少两个能径向伸缩的弹性爪片，在每个弹性爪片的上端分别设有悬挂外卡台，在内滑套的中部设有内卡槽；在球座套内通过第二剪切销钉固定连接有能将弹性爪片向外撑起的连接套，悬挂外卡台卡在内卡槽内，球座套的下部套装在下接头内；在悬挂外卡台下侧的连接套外环面上设有爪片收拢凹槽；在爪片收拢凹槽下侧的连接套上设有外环台，外环台下端的连接套与球座套之间形成开口向下的环槽，在球座套中部设有限位内卡台，限位内卡台位于环槽的上侧内；在连接套的下端外侧固定有限位筒，限位筒的上部位于环槽下侧内；在限位内卡台下端与限位筒上端之间有能使连接套 上提并将球座套解卡的纵向移动间距；纵向移动间距大于悬挂外卡台顶端至爪片收拢凹槽顶端之间的间距；在球座套的下侧内固定安装有球座，限位筒的下端密封座于球座的外侧上。
上述球座的外侧下端可设有外螺纹凸台，球座通过外螺纹凸台螺纹固定安装在球座套的下侧内；外螺纹凸台上端的球座与球座套之间形成开口向上的球座环槽；限位筒的下侧密封安装在球座外侧的球座环槽内；球座的内侧上端设有上宽下窄的球座锥台，在球座锥台下侧的球座上圆周分布有能使球座与球座环槽相连通的泄压孔。
上述外环台与球座套之间可安装有用于连接套上行止退的止退装置；止退装置包括止退开口环，在外环台的外环面中部设有安装槽，在安装槽内安装有止退开口环，在止退开口环的外环面上设有外斜向下的外环爪台，在球座套的内环面上纵向分布有内斜向上的且能与外环爪台相啮合的棘齿槽，外环爪台外端卡在棘齿槽内；在球座下端的球座套内固定安装有下连接头，下连接头呈筒状，在下连接头下部圆周分布有缺口，并将下连接头分隔成至少两个的连接爪片，在连接爪片的外侧纵向间隔分布有外斜向上的钩齿；在连接套的上侧内纵向间隔分布有能与钩齿相互咬合的钩槽。
上述内滑套下部可圆周分布有长槽，并将内滑套分隔成至少两个截面呈弧形的滑套簧片；在滑套簧片的下部外侧设有滑套卡块，滑套卡块的上部导斜形成上窄下宽的导入锥台，滑套卡块的下部导斜形成上宽下窄的导出锥台；与滑套卡块对应的外筒内壁上设有用于压裂侧孔封堵限位的上限位卡槽，滑套卡块卡在上限位卡槽内；在上限位卡槽下方的外筒上设有用于压裂侧孔开启限位的下限位卡槽。
上述压裂侧孔上方和下方的内滑套与外筒之间可分别固定安装有密封圈；球座套上方的连接套与内滑套之间纵向固定安装至少一道密封圈；在滑套簧片上方的内滑套与外筒之间固定安装有密封圈；在下接头与外筒之间固定安装有密封圈；在球座上端外侧与限位筒下端内侧之间固定安装有密封圈。
上述悬挂外卡台处的弹性爪片上可分别设有水平的螺纹孔，与螺纹孔对应的内滑套上有定位工装孔。
本发明结构合理而紧凑，使用方便；利用连续油管，能够将内滑套内部的连接套、球座套和球座上提取出，增大滑套内部通道宽度，不用受球座内径限制，方便后期复杂状况处理；球座上的泄压孔和球座环槽形成的泄压通道，能够释放压力，方便上提；采用钩齿和钩槽配合的下连接头和球座套，可将多个压裂滑套的可取球座组件首尾连接，一并取出井内，操作方便。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明最佳实施例的主视半剖结构示意图。
图2为本发明的球座可取式投球滑套内投入坐封球的结构示意图。
图3为本发明的球座可取式投球滑套内投入坐封球后，压裂侧孔打开的结构示意图。
图4为本发明的球座可取式投球滑套下入连接管后，上提可取球座组件的结构示意图。
图5为本发明的球座可取式投球滑套下压连接套的结构示意图。
附图中的编码分别为：1为外筒，2为内环台，3为下接头，4为滑移槽，5为压裂侧孔，6为内滑套，7为球座套，8为弹性爪片，9为悬挂外卡台，10为连接套，11为爪片收拢凹槽，12为外环台，13为限位内卡台，14为限位筒，15为球座，16为外螺纹凸台，17为球座环槽，18为泄压孔，19为下连接头，20为连接爪片，21为钩齿，22为止退开口环，23为滑套簧片，24为滑套卡块，25为下限位卡槽，26为密封圈，27为第一剪切销钉，28为第二剪切销钉，29为螺纹孔，30为定位工装孔。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明不受下述实施例的限制，可根据本发明的技术方案与实际情况来确定具体的实施方式。
在本发明中，为了便于描述，各部件的相对位置关系的描述均是根据说明书图1的布图方式来进行描述的，如：上、下、左、右等的位置关系是依据说明书图1的布图方向来确定的。
下面结合实施例及附图对本发明作进一步描述：
如图1所示，该球座可取式投球滑套包括外筒1、内滑套6和可取球座组件；在外 筒1的上端设有内环台2，在外筒1的下端内固定安装有下接头3，在内环台2与下接头3之间的外筒1内形成滑移槽4，在滑移槽4上侧的外筒1上圆周分布有至少一个压裂侧孔5，在滑移槽4的上部内安装有能将压裂侧孔5封堵的内滑套6，内滑套6通过第一剪切销钉27与外筒1固定安装在一起；内滑套6的下端与下接头3之间有解封滑移间距；在内滑套6内安装有能通过上提取出的可取球座组件。如图2和图3所示，通过投球蹩压，第一剪切销钉27剪断，内滑套6下行，通过打开压裂侧孔5将压裂通道开启；在压裂通道开启后，可利用连续油管下入到可取球座组件，将可取球座组件取出；取出后的滑套内部通道变宽，不用受球座内径限制，可方便一些大直径尺寸的检测及修复工具经滑套下至入井下，处理井下出水等井下复杂状况；操作简单，解决了压裂井后期处理作业的难题，从而保证井下作业的有效实施。
可根据实际需要，对上述球座可取式投球滑套作进一步优化或/和改进：
如图1所示，可取球座组件包括球座套7、连接套10、限位筒14、球座15和第二剪切销钉28；在球座套7的上端圆周固定有至少两个能径向伸缩的弹性爪片8，在每个弹性爪片8的上端分别设有悬挂外卡台9，在内滑套6的中部设有内卡槽；在球座套7内通过第二剪切销钉28固定连接有能将弹性爪片8向外撑起的连接套10，悬挂外卡台9卡在内卡槽内，球座套7的下部套装在下接头3内；在悬挂外卡台9下侧的连接套10外环面上设有爪片收拢凹槽11；在爪片收拢凹槽11下侧的连接套10上设有外环台12，外环台12下端的连接套10与球座套7之间形成开口向下的环槽，在球座套7中部设有限位内卡台13，限位内卡台13位于环槽的上侧内；在连接套10的下端外侧固定有限位筒14，限位筒14的上部位于环槽下侧内；在限位内卡台13下端与限位筒14上端之间有能使连接套10上提并将球座套7解卡的纵向移动间距；纵向移动间距大于悬挂外卡台9顶端至爪片收拢凹槽11顶端之间的间距，也即，使弹性爪片8能够藏在爪片收拢凹槽11内；在球座套7的下侧内固定安装有球座15，限位筒14的下端密封座于球座15的外侧上。
在压裂通道开启后，如图4所示，通过连续油管下入能够与连接套10固定连接的下连接头，例如螺纹连接，并利用下连接头将连续油管与连接套10连接；上提连续油管，第二剪切销钉28剪断，连接套10随连接油管上行；在此过程中，当爪片收拢凹槽11上移至悬挂外卡台9处时，弹性爪片8上部径向收缩至卡片收拢凹槽11内，也即悬挂外卡台9脱离内滑套6的内卡槽，悬挂外卡台9解卡，球座套7脱离内滑套6；继续上提，连接套10下部的限位筒14顶在限位内卡台13底部，并带动球座套7及底部的 球座15随连接套10一同上行，将球座15从井下取出；操作简单方便，在不影响通道开启的情况下，将其内部连接的连接套10、球座套7和球座15全部取出，增大滑套内部通道宽度，方便一些大直径尺寸的检测及修复工具经滑套送入井下。
如图1所示，球座15的外侧下端设有外螺纹凸台16，球座15通过外螺纹凸台16螺纹固定安装在球座套7的下侧内；外螺纹凸台16上端的球座15与球座套7之间形成开口向上的球座环槽17；限位筒14的下侧密封安装在球座15外侧的球座环槽17内；球座15的内侧上端设有上宽下窄的球座锥台，在球座锥台下侧的球座15上圆周分布有能使球座15与球座环槽17相连通的泄压孔18。由于压裂通道开启时，如图2所示，向井内投球，坐封球座封在球座锥台并将球座15进行封堵；在坐封球座封的情况下，通过连续油管上提连接套10，会使井下产生低压而增加上提阻力；为解决该问题，在球座锥台下侧的球座15上增设有泄压孔18，在通过连续油管上提连接套10时，其底部连接的限位筒14脱离球座15解除密封，并通过球座环槽17和泄压孔18形成的泄压通道使球座15上下两侧的滑套内腔相连通，释放压力，方便上提操作。
如图1所示，在外环台12与球座套7之间安装有用于连接套10上行止退的止退装置；止退装置包括止退开口环22，在外环台12的外环面中部设有安装槽，在安装槽内安装有止退开口环22，在止退开口环22的外环面上设有外斜向下的外环爪台，在球座套7的内环面上纵向分布有内斜向上的且能与外环爪台相啮合的棘齿槽，外环爪台外端卡在棘齿槽内；在球座15下端的球座套7内固定安装有下连接头19，下连接头19呈筒状，在下连接头19下部圆周分布有缺口，并将下连接头19分隔成至少两个的连接爪片20，在连接爪片20的外侧纵向间隔分布有外斜向上的钩齿21；在连接套10的上侧内纵向间隔分布有能与钩齿21相互咬合的钩槽。采用的下连接头19外侧的钩齿21和连接套10上侧内的钩槽结构，俗称马扣结构；为方便取出球座15，在连续油管的下端可固定有下连接头19，通过下连接头19可直接插入至连接套10上侧内时，钩齿21能够咬合在钩槽内，实现连接套10与连接油管的连接，操作方便；除此之外，针对需要使用多个压裂滑套实现分段压裂的油井来说，可利用每个球座套7下端安装的下连接头19；在上提连接套10后，再下压连接套10，如图5所示，受止退开口环22作用，球座套7和下连接头19随连接套10下行至其下侧滑套的连接套10内相互连接；通过该方式，可将井下多个压裂滑套的可取球座组件进行首尾连接后，再一并上提取出，解决多个压裂滑套的球座15取出的问题，操作方便。
如图1所示，在内滑套6下部圆周分布有长槽，并将内滑套6分隔成至少两个截面 呈弧形的滑套簧片23；在滑套簧片23的下部外侧设有滑套卡块24，滑套卡块24的上部导斜形成上窄下宽的导入锥台，滑套卡块24的下部导斜形成上宽下窄的导出锥台；与滑套卡块24对应的外筒1内壁上设有用于压裂侧孔5封堵限位的上限位卡槽，滑套卡块24卡在上限位卡槽内；在上限位卡槽下方的外筒1上设有用于压裂侧孔5开启限位的下限位卡槽25。在压裂通道开启过程中，如图3所示，通过投球蹩压，第一剪切销钉27剪断后，压力作用于内滑套6并推动其下行，此时滑套卡块24的导出锥台受上限位卡槽下端斜面的反向推力向内压缩滑套簧片23，使滑套卡块24脱离上限位卡槽随内滑套6下行；打开压裂侧孔5的同时，滑套卡块24移动至下限位卡槽25处并卡在下限位卡槽25内，将开启状态下的内滑套6限位，起到防止内滑套6回位的作用。
如图1所示，在压裂侧孔5上方和下方的内滑套6与外筒1之间分别固定安装有密封圈26；球座套7上方的连接套10与内滑套6之间纵向固定安装至少一道密封圈26；在滑套簧片23上方的内滑套6与外筒1之间固定安装有密封圈26；在下接头3与外筒1之间固定安装有密封圈26；在球座15上端外侧与限位筒14下端内侧之间固定安装有密封圈26。密封圈26起到增加接触面密封性的作用。
如图1所示，在悬挂外卡台9处的弹性爪片8上分别设有水平的螺纹孔29，与螺纹孔29对应的内滑套6上有定位工装孔30。在安装球座套7和连接套10时，可先用螺钉将弹性爪片8固定在内滑套6上，再向球座套7内部安装连接套10，这样可防止工装时因弹性爪片8内拢而与连接套10产生干涉，方便装配；装配好后，将螺钉从定位工装孔30处向外旋出即可。
以上技术特征构成了本发明的最佳实施例，其具有较强的适应性和最佳实施效果，可根据实际需要增减非必要的技术特征，来满足不同情况的需求。

Claims (10)

  1. 一种球座可取式投球滑套，其中，包括外筒、内滑套和可取球座组件；在所述外筒的上端设有内环台，在所述外筒的下端内固定安装有下接头，在所述内环台与所述下接头之间的所述外筒内形成滑移槽，在所述滑移槽上侧的所述外筒上圆周分布有至少一个压裂侧孔，在所述滑移槽的上部内安装有能将所述压裂侧孔封堵的所述内滑套，所述内滑套通过第一剪切销钉与所述外筒固定安装在一起；所述内滑套的下端与所述下接头之间有解封滑移间距；在所述内滑套内安装有能通过上提取出的所述可取球座组件。
  2. 根据权利要求1所述的球座可取式投球滑套，其中，所述可取球座组件包括球座套、连接套、限位筒、球座和第二剪切销钉；在所述球座套的上端圆周固定有至少两个能径向伸缩的弹性爪片，在每个所述弹性爪片的上端分别设有悬挂外卡台，在所述内滑套的中部设有内卡槽；在所述球座套内通过所述第二剪切销钉固定连接有能将所述弹性爪片向外撑起的所述连接套，所述悬挂外卡台卡在所述内卡槽内，所述球座套的下部套装在所述下接头内；在所述悬挂外卡台下侧的所述连接套外环面上设有爪片收拢凹槽；在所述爪片收拢凹槽下侧的所述连接套上设有外环台，所述外环台下端的所述连接套与所述球座套之间形成开口向下的环槽，在所述球座套中部设有限位内卡台，所述限位内卡台位于所述环槽的上侧内；在所述连接套的下端外侧固定有所述限位筒，所述限位筒的上部位于所述环槽下侧内；在所述限位内卡台下端与所述限位筒上端之间有能使所述连接套上提并将所述球座套解卡的纵向移动间距；所述纵向移动间距大于所述悬挂外卡台顶端至所述爪片收拢凹槽顶端之间的间距；在所述球座套的下侧内固定安装有所述球座，所述限位筒的下端密封座于所述球座的外侧上。
  3. 根据权利要求2所述的球座可取式投球滑套，其中，所述球座的外侧下端设有外螺纹凸台，所述球座通过所述外螺纹凸台螺纹固定安装在所述球座套的下侧内；所述外螺纹凸台上端的所述球座与所述球座套之间形成开口向上的球座环槽；所述限位筒的下侧密封安装在所述球座外侧的所述球座环槽内；所述球座的内侧上端设有上宽下窄的球座锥台，在所述球座锥台下侧的所述球座上圆周分布有能使所述球座与所述球座环槽相连通的泄压孔。
  4. 根据权利要求2或3所述的球座可取式投球滑套，其中，所述外环台与所述球座套之间安装有用于所述连接套上行止退的止退装置；所述止退装置包括止退开口环；在所述外环台的外环面中部设有安装槽，在所述安装槽内安装有所述止退开口环，在所述止退开口环的外环面上设有外斜向下的外环爪台，在所述球座套的内环面上纵向分布有 内斜向上的且能与所述外环爪台相啮合的棘齿槽，所述外环爪台外端卡在所述棘齿槽内；在所述球座下端的所述球座套内固定安装有下连接头，所述下连接头呈筒状，在所述下连接头下部圆周分布有缺口，并将所述下连接头分隔成至少两个的连接爪片，在所述连接爪片的外侧纵向间隔分布有外斜向上的钩齿；在所述连接套的上侧内纵向间隔分布有能与所述钩齿相互咬合的钩槽。
  5. 根据权利要求1或2或3所述的球座可取式投球滑套，其中，所述内滑套下部圆周分布有长槽，并将所述内滑套分隔成至少两个截面呈弧形的滑套簧片；在所述滑套簧片的下部外侧设有滑套卡块，所述滑套卡块的上部导斜形成上窄下宽的导入锥台，所述滑套卡块的下部导斜形成上宽下窄的导出锥台；与所述滑套卡块对应的所述外筒内壁上设有用于所述压裂侧孔封堵限位的上限位卡槽，所述滑套卡块卡在所述上限位卡槽内；在所述上限位卡槽下方的所述外筒上设有用于所述压裂侧孔开启限位的下限位卡槽。
  6. 根据权利要求4所述的球座可取式投球滑套，其中，所述内滑套下部圆周分布有长槽，并将所述内滑套分隔成至少两个截面呈弧形的滑套簧片；在所述滑套簧片的下部外侧设有滑套卡块，所述滑套卡块的上部导斜形成上窄下宽的导入锥台，所述滑套卡块的下部导斜形成上宽下窄的导出锥台；与所述滑套卡块对应的所述外筒内壁上设有用于所述压裂侧孔封堵限位的上限位卡槽，所述滑套卡块卡在所述上限位卡槽内；在所述上限位卡槽下方的所述外筒上设有用于所述压裂侧孔开启限位的下限位卡槽。
  7. 根据权利要求5所述的球座可取式投球滑套，其中，所述压裂侧孔上方和下方的所述内滑套与所述外筒之间分别固定安装有密封圈；所述球座套上方的所述连接套与所述内滑套之间纵向固定安装至少一道密封圈；在所述滑套簧片上方的所述内滑套与所述外筒之间固定安装有密封圈；在所述下接头与所述外筒之间固定安装有密封圈；在所述球座上端外侧与所述限位筒下端内侧之间固定安装有密封圈。
  8. 根据权利要求6所述的球座可取式投球滑套，其中，所述压裂侧孔上方和下方的所述内滑套与所述外筒之间分别固定安装有密封圈；所述球座套上方的所述连接套与所述内滑套之间纵向固定安装至少一道密封圈；在所述滑套簧片上方的所述内滑套与所述外筒之间固定安装有密封圈；在所述下接头与所述外筒之间固定安装有密封圈；在所述球座上端外侧与所述限位筒下端内侧之间固定安装有密封圈。
  9. 根据权利要求2或3所述的球座可取式投球滑套，其中，所述悬挂外卡台处的所述弹性爪片上分别设有水平的螺纹孔，与所述螺纹孔对应的所述内滑套上有定位工装孔。
  10. 根据权利要求8所述的球座可取式投球滑套，其中，所述悬挂外卡台处的所述弹性爪片上分别设有水平的螺纹孔，与所述螺纹孔对应的所述内滑套上有定位工装孔。
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