WO2016173084A1 - Hollow shut-off plug for staged collar - Google Patents

Hollow shut-off plug for staged collar Download PDF

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Publication number
WO2016173084A1
WO2016173084A1 PCT/CN2015/080586 CN2015080586W WO2016173084A1 WO 2016173084 A1 WO2016173084 A1 WO 2016173084A1 CN 2015080586 W CN2015080586 W CN 2015080586W WO 2016173084 A1 WO2016173084 A1 WO 2016173084A1
Authority
WO
WIPO (PCT)
Prior art keywords
ball
plug
hollow
hole
provided
Prior art date
Application number
PCT/CN2015/080586
Other languages
French (fr)
Chinese (zh)
Inventor
赵锦栋
刘建锋
李江平
杨晓庆
Original Assignee
深圳市百勤石油技术有限公司
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.)
Filing date
Publication date
Priority to CN201520262700.8U priority Critical patent/CN204691728U/en
Priority to CN201520262700.8 priority
Application filed by 深圳市百勤石油技术有限公司 filed Critical 深圳市百勤石油技术有限公司
Publication of WO2016173084A1 publication Critical patent/WO2016173084A1/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
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/134Bridging plugs

Abstract

Disclosed is a hollow shut-off plug for a staged collar, comprising a rubber plug mandrel (10), the upper part of the rubber plug mandrel (10) is sheathed with a rubber plug side wing (11), the rubber plug mandrel (10) is internally provided with a hollow hole (12), the lower part of the hollow hole (12) is provided with a ball seat (13), a ball (14) and a ball baffle (15), the ball seat (13) and the ball baffle (15) are both in a threaded connection with the hollow hole (12), the ball (14) is located between the ball seat (13) and the ball baffle (15), the ball seat (13) is provided with a through hole (131), the ball baffle (15) is provided with a perforation (151), the sphere diameter of the ball (14) is greater than the pore diameter of the through hole (131) and the pore diameter of the perforation (151), an annular groove (16) is provided outside the lower part of the rubber plug mandrel (10), and the annular groove (16) is internally snap-fitted with a snap spring (17). When the hollow shut-off plug for a staged collar falls into a well, down-hole impurities are guided to be expelled from the hollow hole (12) to reach a pressure balance, such that the shut-off plug smoothly falls into the bottom of the well and is prevented from returning from the bottom of the well.

Description

A hierarchical hoop closed with hollow plugs

FIELD

[0001] Technical Field The present invention relates to cementing downhole equipment, particularly to a sizing collar closed hollow plug.

Background technique

[0002] Free conventional drill / drill Free non-hierarchical shutoff plug cementing collar, usually a solid structure. Close inch plug operation, is replaced in its entirety into the plug base, cut through the pressing pin, the plug and plug seat off (off to form a solid body) itself fall off bottom. However, since the situation is more complicated downhole, wellbore filled with mud, dirt and other impurities, and the wellbore and the annular clearance and shedding body is relatively small. Original solid body easy self fall off, may also move upward with the downhole production was blocked and at a restricted location, or even the entire production channel blocked (the wellbore). Accordingly, there is a conventional technical problem shut plug, i.e. a plug to close the overall structure of a solid, in the process of falling, the gap between the periphery of the body from falling off the wellbore plug when the plug base and the liquid within the wellbore and other impurities will moves upward, because of the gap is very small, it is likely to cause clogging, not only do not readily fall off the body, even as production impurities back, poor cementing.

technical problem

[0003] The object of the present invention is to provide a smooth fall to bottom of the hollow stopper closing stage collars for deficiencies of the prior art, by improving the structure design, to ensure that the effect of having a better cementing.

Solutions to problems

Technology Solutions

[0004] To solve the above technical problem, the technical solution of the present invention is: a hierarchical collar closed hollow plug, comprising a plug mandrel, an upper portion of the plug socket has a mandrel plug flanking the plug Jian inner mandrel provided with a hollow hole, the lower part of the hollow hole is provided with a ball seat, a ball and baffle, said ball seat, said ball shutter are threaded hollow hole, the ball is the ball between the seat and said ball shutter, Jian said ball seat provided with a through hole, said ball shutter Jian provided with perforations, the diameter of balls and larger than the pore diameter of the perforations of the through hole, said lower outer Jian plug mandrel is provided with an annular groove, said annular groove with a snap circlip

[0005] Preferably, said ball is a ball drillable material. [0006] Preferably the lower outer socket, the gasket stopper has a mandrel, the gasket is located above the circlip.

[0007] Preferably, the bottom surface of the ball seat is provided with through slots Jian.

[0008] Preferably, the ball seat disposed between the sealing ring and the hollow hole.

[0009] Preferably, the section of the through hole is tapered.

Effect of the Invention

Beneficial effect

[0010] Advantageous effects of the present invention are: a hierarchical closing plug ferrule of the present invention is hollow, fall into the bottom of the process

, Downhole pressure and impurity hollow hole stopper may be disposed in the mandrel Jian, Jian ball seat and a ball disposed in the through hole perforated baffle disposed Jian discharge, so smoothly fall into the bottom, and is not easy on the back, so that by conventional solid plugs to avoid the process into the lower bottom, the downhole pressure can not be discharged and impurities, not smoothly into the bottom, resulting in risk of clogging of the wellbore; cards Further, cementing inch, an annular groove disposed spring bounce in the natural state, after Kahuang natural bounce, outside diameter larger than the inner diameter of the plug base closed, that under the action of the clamp spring to close the plug seat is not rebound, cementing achieve good results. Sizing collar of the present invention fall into a hollow plug closing process, and the impurities is discharged through the guide hole from downhole pressure, pressure equalization, so that a smooth fall off bottom plug and prevents back from the bottom thereof; the circlip settings can be sure to close the plug base can not rebound, cementing good effect.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION

[0011] Figure 1 is a sectional view of the plug of the invention, the hollow closed.

[0012] FIG. 2 is a schematic structure of a ball plug closing the shutter of the present invention is hollow.

[0013] FIG. 3 is a schematic view of the plug of the invention, the hollow ball seat off.

[0014] FIG 4 is closed sectional view of the stage collars inch plug into a hollow present invention.

[0015] FIG. 5 of the present invention, the hollow piston closing off the plug base and the plug base and playing Jian shedding body formed cross-sectional view from the stage collars inch.

[0016] FIG. 6 of the present invention, the hollow piston closing off the plug base and the plug base and playing Jian shedding body is formed from the process stage collars down to the bottom, downhole mud, dirt, impurities or other pressure, the plug can be turned off from the hollow hollow discharge aperture, pressure equalization simulation schematic downhole work reached. [0017] The reference numerals comprising

[0018] 10- flanking stopper plug mandrel 11_ hollow bore 12_

[0019] 13- 15_ Ball Ball Ball seat flap 14_

[0020] 16- circlip 18 an annular groove 17 _ gasket

[0021] ring 19_ 30_ 20_ closed the plug base hit Jian seat plug

[0022] 31- 40_ falling ball sizing collar body 50_

[0023] 60 through hole 132_ 131_ cannula through slot

[0024] 151- perforation.

Embodiment of the present invention.

[0025] The present invention will be described in detail in conjunction with the accompanying drawings.

[0026] As shown in FIG. 1 to FIG. 6, the present invention is a hierarchical collar closed hollow plug comprising a plug mandrel 10, the mandrel upper portion of the rubber plug 10 has a plug socket 11 flanking the Jian plug mandrel 10 is provided with a hollow hole 12, a lower part of the hollow hole 12 is provided with a ball seat 13, the ball 14 and the ball baffles 15, 13, 15 are connected with the ball shutter hollow bore ball seat threaded connection 12, the ball 14 is located between the ball seat 15 and the ball shutter 13, the ball seat 13 is provided with a through hole 131 Jian, Jian said ball shutter 15 provided with perforations 151, the ball ball 14 is larger than the pore diameter of the through hole 131 and the perforated aperture 151, the lower outer Jian plug mandrel 10 is provided with an annular groove 16, the annular groove 16 with a snap card spring 17.

[0027] inch cementing, cement slurry is discharged through the circulation holes sizing collar 50 into the annulus 60 and the wall of the sleeve, to release the present invention is replacement of the sizing collar 50 of the plug base 20 is closed, pressurized shear pins, closing plug seat 20 is moved forwardly, clamp spring 17 contracts to a minimum inner hole 20 is closed through the plug base and the front end of the inner bore 30 of the plug base Jian play, playing since the boss Jian Jian plug 30 has a recess, when the circlip 17 after passing through the closing plug base 20, retainer 17 in the natural state bounce, the circlip 17 NATURAL bounce outer diameter than the inner diameter of the seat plug 30 Jian play is larger, the hole closing cycle, due to the action of the circlip 17 closing plug seat 20 is unable to return projectiles.

[0028] continuously pressed, shear pins, this inch, Jian hit the plug base 30 and a closed plug base 20 from departing from the stage collars 50, 40 become off, Figure 5, by its own gravity, falls to the bottom. In the process of falling into the bottom of the well, because the underground has a certain pressure, Jian plug hit the ball seat 30 and closing plugs 31 in 14 balls, pressure rebound. Since the ball seat bottom surface 13 is provided through slot 132 Jian, Jian sparring plug base 30 is formed in the ball 31 is not blocked. In the hollow hole 12 of the plug mandrel 10 is also installed tee baffle 13, and Jian provided with perforations 151 on the ball seat flap 13, the ball seat 13 of the ball shutter 14 is also hollow hole 12 is not formed blocked. In the process of falling off the body 40 to the downhole, the downhole pressure and a hollow hole 10 by the plug mandrel 12 is discharged impurities, so smoothly fall into the bottom, and not easy on the back. Thus avoiding the conventional solid plugs due to the process into the lower bottom, the downhole pressure can not be discharged and impurities, not smoothly into the bottom, the risk of clogging of the wellbore, cementing ultimately to achieve good results.

[0029] The present invention can be used as a tool for the non-hierarchical Free drill collar or other required cementing plug 50, and when after the completion of the job, the special drill or mill may be shoes 40 off the entire milling off.

[0030] In this embodiment, the ball 14 is a shader drillability; Specifically, made drillability shader 14, a period in the wellbore between the inch, can react chemically with the well through the liquid medium, the ball 14 is etched away, thereby reducing the chance of the mandrel through the plugs in the flow channel 10 is blocked.

[0031] In this embodiment, the plug mandrel 10 has a lower outer sleeved gasket 18, the gasket 18 is positioned above the circlip 17, the sealing gasket 18 disposed reinforcing rubber plug mandrel 10 and 20 seat tightness closed plug connection.

[0032] In this embodiment, the ball seat 19 is provided between the seal ring 13 and the hollow hole 12, the seal ring 19 is provided to strengthen the tightness of the ball seat 13 is connected to the hollow hole 12.

[0033] Preferably, the cross section of the through hole 131 is tapered, conical cross section through-hole 131 formed in a funnel-shaped, capable of accommodating the ball 14 more good.

[0034] In summary the present invention is the apparent having excellent characteristics described above, so that it is in the use of conventional techniques enhance the effectiveness and practical No, to be a very practical value products.

[0035] The above is only preferred embodiments of the present invention, those of ordinary skill in the art, according to the ideas of the present invention, may make modifications at specific embodiments and application scope, the present specification shall not be as limiting the present invention.

Claims

Claims
[Claim 1] A sizing collar closed hollow plug, comprising a plug mandrel (10), said plug mandrel (10
) Sleeved upper stopper flaps (11), characterized in that: said plug has a hollow mandrel Jian holes (12) (10), a lower part of the hollow hole (12) is provided with a ball seat ( 13), the ball (14) and a ball shutter (15), said ball seat (13), a ball shutter (15) are (12) connected to said hollow threaded bore, said ball (14) located between the ball seat (13) and said ball shutter (15), said ball seat (13) Jian provided with through holes (131), said ball shutter (15) provided with perforations Jian (151), the pore size and pore size of the perforations (151) of said ball (14) is greater than the spherical diameter of the through hole (131) of the plug lower outer mandrel (10) is provided with an annular groove Jian (16) the annular groove (16) is connected with the card circlip (17
[Claim 2] according to claim 1 according to a hierarchical ferrule closed hollow plug, wherein: said ball (14) is a drillable shader.
[Claim 3] according to claim 1 according to a hierarchical ferrule closed hollow plug, wherein: said plug mandrel (10) is mounted a lower outer gasket (18), said sealing apron (18) located in the circlip (17) above.
[Claim 4] a hierarchical ferrule according to claim 1, said hollow stopper closed, wherein: said ball seat bottom (13) faces a through slot Jian (132).
[Claim 5] a hierarchical ferrule according to claim 1, said hollow stopper closed, characterized in that: a sealing ring is provided (19) between said ball seat (13) and hollow bore (12).
[Claim 6] a hierarchical ferrule according to claim 1, said hollow stopper closed, characterized in that: (131) a section of the through hole is tapered.
PCT/CN2015/080586 2015-04-28 2015-06-02 Hollow shut-off plug for staged collar WO2016173084A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201520262700.8U CN204691728U (en) 2015-04-28 2015-04-28 Hierarchical hoop is inaccessible with hollow pass
CN201520262700.8 2015-04-28

Publications (1)

Publication Number Publication Date
WO2016173084A1 true WO2016173084A1 (en) 2016-11-03

Family

ID=54232031

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/080586 WO2016173084A1 (en) 2015-04-28 2015-06-02 Hollow shut-off plug for staged collar

Country Status (2)

Country Link
CN (1) CN204691728U (en)
WO (1) WO2016173084A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1010780A (en) * 1975-03-20 1977-05-24 Andrew Markicevic Blasting plug
US20070119600A1 (en) * 2000-06-30 2007-05-31 Gabriel Slup Drillable bridge plug
CN103775025A (en) * 2014-03-03 2014-05-07 青岛海蚨奥工贸有限公司 Classifying hoop
US20140262212A1 (en) * 2013-03-13 2014-09-18 Ccdi Composites, Inc. Resin system for composite downhole frac plug and bridge plug tools and related methods
CN204098850U (en) * 2014-07-14 2015-01-14 深圳市百勤石油技术有限公司 Through-bottom type drilling-free stage hoop

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1010780A (en) * 1975-03-20 1977-05-24 Andrew Markicevic Blasting plug
US20070119600A1 (en) * 2000-06-30 2007-05-31 Gabriel Slup Drillable bridge plug
US20140262212A1 (en) * 2013-03-13 2014-09-18 Ccdi Composites, Inc. Resin system for composite downhole frac plug and bridge plug tools and related methods
CN103775025A (en) * 2014-03-03 2014-05-07 青岛海蚨奥工贸有限公司 Classifying hoop
CN204098850U (en) * 2014-07-14 2015-01-14 深圳市百勤石油技术有限公司 Through-bottom type drilling-free stage hoop

Also Published As

Publication number Publication date
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