CN106285556A - Cementing plug and cementing method and the segmented fracturing device of applying it - Google Patents
Cementing plug and cementing method and the segmented fracturing device of applying it Download PDFInfo
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- CN106285556A CN106285556A CN201510237492.0A CN201510237492A CN106285556A CN 106285556 A CN106285556 A CN 106285556A CN 201510237492 A CN201510237492 A CN 201510237492A CN 106285556 A CN106285556 A CN 106285556A
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- cementing plug
- elastomer
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- plug
- impacting seat
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Abstract
The invention discloses a kind of cementing plug, tubing string that this cementing plug can change finally and impacting seat realizes bruising by internal diameter.Wherein, cementing plug includes core body and at least part of uniform fold elastomer at core outer surface, core body is used for supporting elastomer or being used for making cementing plug fix with impacting seat, and elastomer is for being in close contact and realize relative slip with the inwall of the tubing string of internal diameter change.The present invention by being set to the flexible body of core outer surface uniform fold by cementing plug, and the outer surface of its elastomer and pipe string internal wall completely attach to so that it is distinguishes the structure such as rubber bowl type of cementing plug elastomer of the prior art.The elastomeric material of its elastomer self has good retractility, can pass through and there is the tubing string of different inner diameters and final and impacting seat realizes bruising, especially can pass through the tubing string that internal diameter changes greatly, improve well cementation displacement efficiency, reduce cementing operation risk.
Description
Technical field
The present invention relates to petroleum oil well completion field, particularly to a kind of cementing plug and application its well cementation method, with
And the segmented fracturing device of a kind of this cementing plug of application.
Background technology
Casing cementing sliding sleeve staged fracturing technology is a kind of for permeating oil-gas reservoir, shale oil (gas) Tibetan etc. very
Rule oil (gas) hide the novel stimulation technology of exploitation, raising Oil/gas Well well yield are had obvious technology excellent
Gesture.Wherein, it is to ensure that instrument is implemented safe, high after entering well as the cementing plug that casing cementing sliding sleeve is supporting
Effect well cementation and the guarantee of later stage pressing crack construction.Specific construction technological process is: possess certain ball seat differential or
Full-bore well cementation sliding sleeve, requires along with sleeve pipe in the lump G.I.H according to reservoir reconstruction and carries out cementing operation.
When carrying out replacement program, putting into supporting cementing plug by ground, cementing plug is by casing inner diameter, no
With diameter sliding sleeve tee and sliding sleeve reducing inwall, simultaneously to above-mentioned instrument inwall or the residual water mud on surface
Carry out scraping.When plug goes downwards at the impacting seat of shaft bottom, plug coordinates realization to seal, with complete with impacting seat
Become well cementation replacement, bruising program.
And current existing cementing plug is rubber bowl type, it is by glue bowl structure, glue bowl size, glue bowl material
The impact of the factor such as energy, it is difficult in the tubing string that internal diameter changes greatly (such as 5-1/2 " sliding sleeve tee a diameter of 53 to
85mm, casing inner diameter 121mm, sliding sleeve maximum inner diameter 155mm) to internal surface of sleeve pipe, ball seat and sliding sleeve inwall
Carrying out effective scraping, easily there is abrasion and fracture in glue bowl, reduces well cementation displacement efficiency, increases cementing operation
Risk.
The problem existed for above-mentioned technology, wishes to seek a kind of Novel cementing plug in the art so that it is
Well cementing operation safe efficient, reliable can be guaranteed, to solve prior art in the tubing string that internal diameter changes greatly
In weak point.
Summary of the invention
The technical problem to be solved in the present invention is to overcome existing cementing plug to be difficult to the pipe changed greatly at internal diameter
Internal surface of sleeve pipe, sliding sleeve inwall are carried out in post a difficult problem for effective scraping, in order to reach above-mentioned technology requirement, this
Invention provides a kind of Novel cementing plug.
A kind of cementing plug provided according to the present invention, tubing string that this cementing plug can be changed by internal diameter the most finally
Bruising is realized with impacting seat.Wherein, cementing plug includes that core body and at least part of uniform fold are at core outer surface
Elastomer, core body is used for supporting elastomer or being used for making cementing plug fix with impacting seat, elastomer for
The inwall of the tubing string of internal diameter change is in close contact and realizes slip relatively.
The present invention by being set to the flexible body of core outer surface uniform fold, outside its elastomer by cementing plug
Surface completely attaches to pipe string internal wall so that it is distinguish the rubber bowl type etc. of cementing plug elastomer of the prior art
Structure.On the one hand the cementing plug of the present invention has well due to the elastomeric material of its elastomer self in use
Retractility so that it is can pass through and there is the tubing string of different inner diameters and final and impacting seat realizes bruising, especially
It is to pass through the tubing string that internal diameter changes greatly；On the other hand can be complete with inner-walls of duct due to elastomer
Ground, it is closely contacted, it is possible to effectively the inwall of tubing string is carried out scraping, it is to avoid cementing plug in prior art
Rubber bowl type structure easily occur abrasion and fracture defect, improve well cementation displacement efficiency, reduce cementing operation
Risk.It addition, the present invention can according to the behaviour in service that cementing plug is different separately design himself shape and
Size, in order to better adapt to different tubing strings and impacting seat.
In some embodiments, elastomer is cylindric.Columned elastomer connects completely with the inwall of tubing string
Touch, be beneficial to it and inwall of tubing string is carried out effective scraping.
In some embodiments, core body includes the body covered by cylindrical elastomeric and extends cylindric bullet
The guide head of gonosome.Body in core body is used for supporting cylindrical elastomeric, and guide head is for existing at cementing plug
Playing the guiding role when advancing in pipe string internal wall, under the effect of guide head, cementing plug can smoothly pass internal diameter
Different pipe string internal walls also arrives the position of impacting seat smoothly and realizes bruising with it.
In some embodiments, guide head is provided with the anti-back ring for being connected with impacting seat.When well cementation glue
Bigger shaft bottom buffer brake may be born after plug and impacting seat bruising, therefore make well cementation by arranging anti-back ring
Plug links together with impacting seat, and this arranges and on the one hand bruising process can be made more firm, on the other hand can also
Cementing plug and impacting seat is made to realize better seal effect.
In some embodiments, elastomer is provided with what area of section was gradually reduced on the direction of guide head
Tapering, the range of taper in tapering is preferably 30 ° to 50 °.This tapering be provided for the bruising with impacting seat
Inclined-plane matches, and adapts to the impacting seat of different model by this tapering sets certain range of taper, thus
Realize cementing plug and different impacting seat better seal effects.Preferably, the tapering in this tapering is 45 °.
In some embodiments, elastomer and core body are spherical.The cementing plug with spherical elastomer exists
During use, the inwall of its elastomer is in close contact and tangent with pipe string internal wall all the time, equally reaches in tubing string
Wall carries out the purpose of effective scraping.Meanwhile, spherical cementing plug is advanced forward during pressurized is advanced
The most rotatable, it is more beneficial for it and pipe string internal wall is carried out effective scraping.It addition, spherical cementing plug exists
During use more flexibly, the pipe string internal wall that internal diameter is different can be passed through.
In some embodiments, cementing plug is made up of foaming polymer material.This kind of material is selected to make solid
Well plug has good flexible ability so that it is better adapts to different pipe string internal walls, thus completes himself
Function.
A kind of device for staged fracturing provided according to the present invention, including: pipe box, it is socketed in one with pipe box
The well cementation sliding sleeve risen, is arranged on the impacting seat of pipe box ad-hoc location, and above-mentioned cementing plug.Wherein, bruising
Seat includes for the bruising inclined-plane of bruising tangent with cementing plug with for the draw-in groove being connected with core body.Above-mentioned well cementation
Plug can with the pipe box in this device, well cementation sliding sleeve and impacting seat with the use of, the cementing plug of the present invention at this
Device is especially suitable for supporting with spherically seated or full-bore well cementation sliding sleeve.
A kind of method using above-mentioned cementing plug to cement the well provided according to the present invention, comprises the following steps:
1) sleeve pipe, well cementation sliding sleeve and impacting seat are entered under,
2) put into and replace cementing plug, until cementing plug and impacting seat bruising.
According to the present invention, when needing to bear shaft bottom buffer brake after cementing plug with impacting seat bruising, optional
The cementing plug with cylindrical elastomeric with anti-back parts；When after cementing plug and impacting seat bruising without
When bearing shaft bottom buffer brake, can select to use the cementing plug preferably with spherical elastomer by property.
In some embodiments, in step 2) including: before cementing plug reaches first well cementation sliding sleeve
During one ad-hoc location, reduce infusion discharge capacity, continue to replace cementing plug, until cementing plug and impacting seat bruising.
When can be prevented effectively from cementing operation by this set, cementing plug is scraped destruction.
Compared with prior art, the invention have the advantages that
1) cementing plug that the present invention provides can be in internal surface of sleeve pipe and sliding sleeve in the tubing string that internal diameter changes greatly
Wall carries out effective scraping, is particularly suited for supporting the use with spherically seated and full-bore formula well cementation sliding sleeve.On its core body
Cover the elastomer of regular shape, overcome cementing plug glue bowl in prior art and abrasion and fracture etc. easily occur
Defect, improves well cementation displacement efficiency, reduces cementing operation risk.
2) cementing plug that the present invention provides and supporting impacting seat realize bruising, anti-owing to devising on core body
Move back parts, enable cementing plug to bear bigger buffer brake, it is ensured that its with impacting seat bruising after compression
With sealing, thus improve cementing quality.
3) the cementing plug simple in construction that the present invention provides, volume is little, and cementing plug body all uses high intensity
Elastomeric material, is not susceptible to when advancing in pipe meet card and cock body fragmentation accident, improves construction reliability.
Accompanying drawing explanation
Hereinafter based on embodiment reference accompanying drawing, the present invention will be described in more detail.Wherein:
Fig. 1 is the structural representation of the cementing plug according to the first embodiment of the present invention；
Fig. 2 is the structural representation of cementing plug according to the second embodiment of the present invention；
Fig. 3 is the structural representation of the device for staged fracturing according to the present invention；
Fig. 4 is the structural representation of the impacting seat in Fig. 3 shown device.
In the accompanying drawings, identical parts use identical reference.Accompanying drawing is not painted according to actual ratio
System.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
Details described here is exemplary, and is only used for illustratively begging for embodiments of the invention
Opinion, the presence of which is to provide for being considered as most useful in terms of the principle to the present invention and concept and
Intelligible description.About this point, it is not attempted to here the CONSTRUCTED SPECIFICATION of the present invention is exceeded base
This understands the introduction of the degree needed for the present invention, and those skilled in the art is permissible by description and accompanying drawing thereof
Readily understand how to be practically carrying out several forms of the present invention.
A kind of cementing plug provided according to the present invention, tubing string that this cementing plug can be changed by internal diameter
Bruising is realized eventually with impacting seat.Wherein, cementing plug includes that core body and at least part of uniform fold are outside core body
The elastomer on surface, core body is used for supporting elastomer or being used for making cementing plug fix with impacting seat, elastomer
For being in close contact and realize relative slip with the inwall of the tubing string that internal diameter changes.
The present invention by cementing plug being set to the flexible body of core outer surface uniform fold, its elastomer
Outer surface completely attaches to pipe string internal wall so that it is distinguish the glue bowl of cementing plug elastomer of the prior art
The structures such as formula.On the one hand the cementing plug of the present invention has due to the elastomeric material of its elastomer self in use
There is good retractility so that it is can pass through and there is the tubing string of different inner diameters final and impacting seat realization
Bruising, especially can pass through the tubing string that internal diameter changes greatly；On the other hand can be with pipe due to elastomer
Road inwall fully, be closely contacted, it is possible to effectively the inwall of tubing string is carried out scraping, it is to avoid existing skill
In art easily there is abrasion and the defect of fracture in the rubber bowl type structure of cementing plug, improves well cementation displacement efficiency,
Reduce cementing operation risk.It addition, the present invention can set respectively according to the behaviour in service that cementing plug is different
Count the shape and size of himself, in order to better adapt to different tubing strings and impacting seat.
Embodiment one:
Fig. 1 shows the structural representation of the cementing plug 100 according to the first embodiment of the present invention.Such as Fig. 1
Shown in, the elastomer 30 of cementing plug 100 is cylindrical elastomeric 31.This columned elastomer 31 and pipe
The inwall of post completely attaches to, and is beneficial to it and inwall of tubing string is carried out effective scraping.
According to the present invention, core body 50 includes the body 51 covered by cylindrical elastomeric 31 and extends cylinder
The guide head 52 of shape elastomer 31.Body 51 in core body 50 is used for supporting cylindrical elastomeric 30, guides
52 for playing the guiding role when cementing plug 100 is advanced in pipe string internal wall, in the effect of guide head
Under, cementing plug 100 can smoothly through the different pipe string internal wall of internal diameter and smoothly arrival impacting seat 400 (as
Shown in Fig. 3) position realize bruising with it.Preferably, body 51 can be provided with multiple protruding 33, should
Protruding 33 are used for making that body 51 is more convenient with elastomer 30 to be effectively connected together.
Preferably, guide head 52 is provided with the anti-back ring 521 for being connected with impacting seat.This anti-back ring is preferred
For snap ring, it can remake elaboration with impacting seat 400 phase clamping, this snap fit in follow-up description.
When bigger shaft bottom buffer brake may be born after cementing plug with impacting seat bruising, therefore anti-by arranging
Moving back ring 521 makes cementing plug 100 link together with impacting seat, and this arranges and on the one hand bruising process can be made more steady
Gu, cementing plug 100 and impacting seat 400 on the other hand can also be made to realize better seal effect.Further preferably
Ground, guide head 52 is additionally provided with sealing ring 522, and this sealing ring 522 makes cementing plug 100 further and touches
Wedge realizes better seal effect.
It is understood that elastomer 30 can only be set to cylindrical elastomeric 31, it is possible to cylindric at this
On the basis of continue to make improvement, as continued to extend tapering 32 in cylindrical elastomeric 31, such as Fig. 1 institute
In the embodiment shown, cylindrical elastomeric 31 gradually subtracts towards being provided with area of section on the direction of guide head 52
Little tapering 32, the range of taper in tapering 32 is 30 ° to 50 °.Being provided for and bruising of this tapering 32
The bruising inclined-plane of seat matches, and adapts to different model by this tapering 32 is set certain range of taper
Impacting seat, thus realize cementing plug 100 and different impacting seat better seal effects.Preferably, tapering 32
Tapering be 45 °, also preferably 35 °.Additionally, also can arrange in the end of cylindrical elastomeric 31
Angle, to increase practicality and aesthetic property.
Embodiment two:
Fig. 2 shows the structural representation of cementing plug 100 ' according to the second embodiment of the present invention.Such as Fig. 2
Shown in, cementing plug 100 ' includes spherical elastomer 30 ' and spherical core body 50 '.There is spherical elastomer
The inwall of cementing plug 100 ' its elastomer in use is in close contact and tangent with pipe string internal wall all the time, equally may be used
To reach pipe string internal wall is carried out the purpose of effective scraping.Meanwhile, spherical cementing plug 100 ' is advanced at pressurized
During forward advance while the most rotatable, be more beneficial for it and pipe string internal wall carried out effective scraping.Separately
Outward, spherical cementing plug 100 ' is the most flexible, can pass through the pipe string internal wall that internal diameter is different.
According to the present invention, cementing plug is made up of foaming polymer material.Select this kind of material can make well cementation glue
Plug has good flexible ability so that it is better adapts to different pipe string internal walls, thus completes himself
Function.
The device 1000 for staged fracturing provided according to the present invention as shown in Figure 3, including: pipe box
200 well cementation sliding sleeves 300 connected together with pipe box 200, the impacting seat being arranged on pipe box 200 ad-hoc location
400 and above-mentioned cementing plug.Wherein, in embodiment as shown in Figure 4, impacting seat 400 include for
The bruising inclined-plane 401 of the tangent bruising of cementing plug and the draw-in groove 402 for being connected with core body.Anti-back ring 521 is excellent
The snap ring of choosing with draw-in groove 402 phase clamping, thus can fix cementing plug.Above-mentioned cementing plug can be with this dress
Pipe box 200, well cementation sliding sleeve 300 and impacting seat 400 in putting with the use of, the cementing plug of the present invention at this
Device is especially suitable for support the use with spherically seated or full-bore well cementation sliding sleeve.
A kind of method using above-mentioned cementing plug to cement the well provided according to the present invention, comprises the following steps:
1) sleeve pipe, well cementation sliding sleeve and impacting seat are entered under,
2) put into and replace cementing plug, until cementing plug and impacting seat bruising.
In this using method, when needing to bear shaft bottom buffer brake after cementing plug with impacting seat bruising,
The optional cementing plug with cylindrical elastomeric with anti-back parts；When cementing plug touches with impacting seat
Time after pressure without bearing shaft bottom buffer brake, use can be selected preferably to have spherical elastomer by property
Cementing plug.
According to the present invention, in step 2) including: when cementing plug, to reach first well cementation sliding sleeve previous specific
During position, reduce infusion discharge capacity, continue to replace cementing plug, until cementing plug and impacting seat bruising.Logical
Cross cementing plug when this set can be prevented effectively from cementing operation and scraped destruction.
Preferably, after putting into selected cementing plug, replace according to set infusion program, when well cementation glue
Plug reaches 1m before first well cementation sliding sleeve3About/min, reduction infusion discharge capacity to 1m3About/min, continues top
For cementing plug, until cementing plug and described impacting seat bruising.Bruising proceeds well cementation and pressure after terminating
Split subsequent construction operation.
The present invention can be the pipe string internal wall of 50 to 160mm by internal diameter excursion by experimental verification, and with
Time well internal surface of sleeve pipe, ball seat and sliding sleeve inwall can be carried out effective scraping, substantially increasing well cementation top
For efficiency.The especially present invention can pass through by the sliding sleeve tee of a diameter of 53 to 85mm, and internal diameter is
121mm sleeve pipe, maximum inner diameter is the inner-walls of duct that 155mm sliding sleeve matches, and completes good scraping simultaneously
Replace effect.
It should be noted that foregoing example is only to be construed to purpose, and it is not construed as limiting this
Bright.Although according to exemplary embodiment, invention has been described, it being understood, however, that makes here
Be descriptive and illustrative language rather than restrictive language.Presently described and amendment
In scope of the following claims, without departing from the scope of scope and spirit of the present invention, can be to this
Bright it is changed.Although the most the present invention being retouched according to specific mode, material and embodiment
State, but the present invention is not limited in details disclosed herein；On the contrary, the present invention extends to such as appended
The structure of all identical functions in the range of claim, methods and applications.
Claims (10)
1. a cementing plug, tubing string that described cementing plug can be changed by internal diameter final and impacting seat
Realizing bruising, wherein, described cementing plug includes that core body and at least part of uniform fold are at described core outer surface
Elastomer, described core body is used for supporting described elastomer or is used for making described cementing plug solid with described impacting seat
Fixed, described elastomer is for being in close contact and realize relative slip with the inwall of the described tubing string of internal diameter change.
Cementing plug the most according to claim 1, it is characterised in that described elastomer is cylindric.
Cementing plug the most according to claim 2, it is characterised in that described core body includes cylindric
The body that described elastomer covers and the guide head extending cylindric described elastomer.
Cementing plug the most according to claim 3, it is characterised in that be provided with use on described guide head
In the anti-back ring being connected with described impacting seat.
5. according to the cementing plug described in claim 3 or 4, it is characterised in that described elastomer is towards institute
State and on the direction of guide head, be provided with the tapering that area of section is gradually reduced.
Cementing plug the most according to claim 1, it is characterised in that described elastomer and described core body are equal
For spherical.
Cementing plug the most according to any one of claim 1 to 6, it is characterised in that described well cementation
Plug is made up of foaming polymer material.
8. for a device for staged fracturing, including,
Pipe box,
The well cementation sliding sleeve connected together with described pipe box,
It is arranged on the impacting seat of described pipe box ad-hoc location, and
Cementing plug as according to any one of claim 1 to 7,
Wherein, described impacting seat include for the bruising inclined-plane of bruising tangent with described cementing plug and for institute
State the draw-in groove that core body is connected.
9. apply a cementing method for cementing plug in device as claimed in claim 8, including following
Step:
1) described sleeve pipe, well cementation sliding sleeve and impacting seat are entered under,
2) put into and replace described cementing plug, until described cementing plug and impacting seat bruising.
Cementing method the most according to claim 9, it is characterised in that in step 2) include,
When described cementing plug reaches first previous ad-hoc location of well cementation sliding sleeve, reduce infusion discharge capacity, continue
Replace described cementing plug, until described cementing plug and described impacting seat bruising.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510237492.0A CN106285556A (en) | 2015-05-12 | 2015-05-12 | Cementing plug and cementing method and the segmented fracturing device of applying it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510237492.0A CN106285556A (en) | 2015-05-12 | 2015-05-12 | Cementing plug and cementing method and the segmented fracturing device of applying it |
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|---|---|
| CN106285556A true CN106285556A (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510237492.0A Pending CN106285556A (en) | 2015-05-12 | 2015-05-12 | Cementing plug and cementing method and the segmented fracturing device of applying it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917599A (en) * | 2017-04-27 | 2017-07-04 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of degradable cementing plug and fraclional well cementing device and method |
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| CN203603840U (en) * | 2013-11-28 | 2014-05-21 | 中国石油集团川庆钻探工程有限公司 | Wear-resistant rubber plug for well cementing |
| CN104179485A (en) * | 2014-09-02 | 2014-12-03 | 安东石油技术（集团）有限公司 | Cementation and fracture technique string and cementation and fracture technique process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6196316B1 (en) * | 1998-02-26 | 2001-03-06 | Shell Oil Company | Compositions for use in well construction, repair and/or abandonment |
| CN2881078Y (en) * | 2006-04-10 | 2007-03-21 | 新疆石油管理局钻井工艺研究院 | Self-locking rubber plug |
| CN102400659A (en) * | 2010-09-07 | 2012-04-04 | 大港油田集团有限责任公司 | Multifunctional cementer |
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| CN106917599A (en) * | 2017-04-27 | 2017-07-04 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of degradable cementing plug and fraclional well cementing device and method |
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