CN106522871B - A kind of open hole packer - Google Patents
A kind of open hole packer Download PDFInfo
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- CN106522871B CN106522871B CN201510586590.5A CN201510586590A CN106522871B CN 106522871 B CN106522871 B CN 106522871B CN 201510586590 A CN201510586590 A CN 201510586590A CN 106522871 B CN106522871 B CN 106522871B
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- inner sleeve
- wall
- casing
- open hole
- packer
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Abstract
The invention proposes a kind of open hole packers, including inner sleeve and the fluid cylinder being sequentially connected in series on the outer wall for being set to inner sleeve, packing element and end ring.It is with annular space between fluid cylinder and inner sleeve, the flowing hole that can be aligned with annular space is equipped on casing and the wall of inner sleeve, retaining ring can be melted by being equipped at the both ends of inner sleeve.The fixed ring matched with casing is equipped at the both ends of inner sleeve, retaining ring can be melted by being equipped between fixed ring and casing.Open hole packer of the invention can guarantee that when casing thermally expands, retaining ring thawing is melted in packer two sides, and the axial constraint between casing and inner sleeve disappears, and allow the two that relative motion occurs, and then guarantee that the packing effect of packer is unaffected.
Description
Technical field
The present invention relates to the one kind applied during natural petroleum gas field technical field more particularly to naked eye staged fracturing
Open hole packer.
Background technique
Currently, in oilfield exploitation procedure, especially in the naked eye staged fracturing transformation process of straight well or horizontal well, one
As sectional well completion and transformation carried out using open hole packer.Needle can be taken to each payzone of oil gas field using open hole packer
To the modification measures of property, for example, increasing with acid strength or increasing sand fracturing scale, to really realize that each payzone Duan Junneng reaches
To the purpose for effectively releasing nearly well plugging, linking up reservoir.
Open hole packer can mainly play packing naked eye as one of the important tool in barefoot completion segmentation reforming technology
The effect of Reservoir Section.In heavy oil wells, Yao Caiyong high temperature hot steam is heated to oil reservoir, and high temperature can make well inner sleeve temperature simultaneously
Increase, since casing is very long, the thermal expansion phenomenon of casing cannot be ignored.However, existing most of open hole packers are all solid
It is scheduled on casing, displacement can be generated with the thermal expansion of casing and with open hole wall after setting, influence to insulate effect, or even can cause
Packing failure.Simultaneously as stage underground of recovering the oil inevitably leads to the problem of various, need to carry out well-flushing and workover treatment,
What packer will affect casing under the state that sets above proposes operation.
Therefore, it is necessary to a kind of novel open hole packers to meet the use demand during deep-well packing.
Summary of the invention
In order to solve above-mentioned part or all of technical problem, a kind of open hole packer of the present invention is set to the outer wall of casing
On, including inner sleeve and the fluid cylinder being sequentially connected in series on the outer wall for being set to inner sleeve, packing element and end ring.It is enclosed between fluid cylinder and inner sleeve
There is annular space, the flowing hole that can be aligned with annular space is equipped on casing and the wall of inner sleeve, retaining ring can be melted by being equipped at the both ends of inner sleeve.
Preferably, the fixed ring matched with casing is equipped at the both ends of inner sleeve, retaining ring can be melted by being equipped between fixed ring and casing.
In this case, when packer enters operation in well, make position to the high-temperature steam that underground is injected during thermal recovery
Retaining ring in packer two sides melts, and the axial constraint between casing and inner sleeve disappears, and allows the two that relative motion occurs.
Casing can occur to thermally expand phenomenon and generate axial displacement under the influence of the high temperature of underground, due to that can carry out phase between casing and inner sleeve
To movement, it may therefore be assured that it is opposing stationary between packer and open hole wall, and then guarantee packing effect.I.e., it is possible to guarantee
In casing thermal expansion, the packing effect of packer is unaffected.
Further, the area Yi Peng is configured in the center of the inner wall of packing element.Specifically, the area Yi Peng includes being set to packing element
On groove and/or opening and groove and/or opening peripheral region.Weak link is formd in the middle part of packing element as a result,
When setting power act on packing element when, packing element expands first at center so that the sealing between packing element and the borehole wall every envelope effect more
It is ideal.
Further, spring is equipped in the two sides of packing element.The anti-lug structure on shell is eliminated as a result, is made outside packer
Surface is isometrical, can generate and collide between open hole wall when recycling operation to avoid packer, influence casing and above mention.
Further, shackle member is equipped between end ring and inner sleeve.Specifically, shackle member is insertion inner sleeve and protrudes outside it
The fixture block of wall is equipped with the clamping groove matched with fixture block on the inner wall of end ring.It is set on the sleeve outer wall of the upstream of end ring
There is deblocking groove.The inclined-plane of inclined downstream is configured with by the upstream end of proximal loop in fixture block.In this case, casing is above mentioned
When fixture block uplink a distance therewith, fallen under packing element squeezing action in deblocking groove.Axial direction between fixture block and end ring is about
Beam disappears, and end ring is detached from fixture block along inclined-plane, and is moved downward under the squeezing action of packing element, packing element deblocking.
Further, collar part is equipped on the sleeve outer wall in the downstream of end ring.As a result, when between packing element and open hole wall
Extruding force disappear, packer unit integrally slides to box cupling position, it is upper mention casing during packer reach together therewith
To well head, realizes and salvage recycling operation.
The present invention has the advantages that (1) packing effect is good, since weak link being arranged in the middle part of packing element, in seating sealing load
Under effect, the seal pack effect between packing element and the borehole wall is ideal.(2) self compensation is realized, underground high temperature makes two side block of packer
Circle melts, and axial constraint disappears between casing and packer, and relative motion can occur for the two.Therefore can guarantee packer with it is naked
It is opposing stationary between the eye borehole wall, guarantee packing effect.(3) situations such as salvaging of packer recycles, encounters well workover, well-flushing is realized
When, the deblocking and recycling of packer can be realized by above mentioning casing.
Detailed description of the invention
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein:
Fig. 1 is the structural schematic diagram of the open hole packer of the embodiment of the present invention.
In the accompanying drawings, identical component uses identical appended drawing reference.Attached drawing is not according to actual ratio.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
As shown in Figure 1, open hole packer is set on the outer wall of casing 15, including the inner sleeve 3 being fixedly connected with casing 15
And it is sequentially connected in series on the outer wall of inner sleeve 3 and is provided with fluid cylinder 7, packing element 10 and end ring 12.It is enclosed between fluid cylinder 7 and inner sleeve 3
There are upstream annular space and lower lantern control.The flowing hole 7 ' that can be aligned with downstream annular space is equipped on casing 15 and the wall of inner sleeve 3, in mistake
The two sides of discharge orifice 7 ' are equipped with sealing ring 8.Anti-back circlip 6 is equipped in the upper end of upper lantern control.
In order to avoid in the hot environment in thermal recovery, after packer setting, casing 15 generates under thermal expansion and contraction principle
Move axially and destroy the packing effect of packing element 10.In one particular embodiment of the present invention, by the both ends of inner sleeve 3 be equipped with
The fixed ring 2 that casing 15 matches, retaining ring 1 can be melted by being equipped between fixed ring 2 and casing 15.In this case, work as envelope
When device enters heavy duty service, underground high temperature makes to melt the thawing of retaining ring 1 positioned at packer two sides, casing 15 and inner sleeve 3 it
Between axial constraint disappear, allow the two that relative motion occurs.Casing 15 can thermally expand under the influence of the high temperature of underground
Phenomenon and generate axial displacement, since relative motion can be carried out between casing 15 and inner sleeve 3, it may therefore be assured that packer with
It is opposing stationary between open hole wall, and then guarantee packing effect.
In one particular embodiment of the present invention, the area Yi Peng 16 is configured in the center of the inner wall of packing element 10.It is preferred that
Ground, the area Yi Peng 16 include the peripheral region of the groove being set on packing element 10 and/or opening and groove and/or opening.It is preferred that
Ground can remove a V-groove in packing element inner diameter central portion band girdle, form certain weak link.In this case, due to
The middle part of packing element 10 forms certain weak link, packer when underground is set, by underground hot environment influenced with
And the effect of seating sealing load can guarantee that packing element 10 expands near the center area Chu Yipeng 16, make at the center of packing element 10 and well
Wall is in close contact, and then keeps the seal pack effect between packing element 10 and the borehole wall ideal.
In one particular embodiment of the present invention, as shown in Figure 1,10 two sides of packing element vulcanize spring 9, packing element 10 is eliminated
The anti-lug structure of shell, keeps packer outer surface isometrical.Thus, it is possible to when packer being avoided to recycle operation between open hole wall
Collide with, influence above mentioning for casing 15.
In one particular embodiment of the present invention, shackle member is equipped between end ring 12 and inner sleeve 3.Preferably, shackle member
For in insertion inner sleeve 3 and protrude inner sleeve 3 outer wall fixture block 13, the card that matches with fixture block 13 is equipped on the inner wall of end ring 12
Connect groove (not regarding out).The first sealing ring 11 and the second sealing ring 14 are respectively equipped in the upper and lower ends of fixture block 13.In fixture block 13
It is configured with the inclined-plane of inclined downstream, by the upstream end of proximal loop 12 so that fixture block 13 is sliding along inclined-plane during removing seal for packer
Dynamic abjection clamping groove.
In one particular embodiment of the present invention, deblocking groove is equipped on the outer wall of the casing 15 of the upstream of end ring 12
(not regarding out).Uplink a distance therewith of fixture block 13 when above mentioning casing 15 as a result, falls into solution under the squeezing action of packing element 10
It seals in groove (not regarding out).Axial constraint between fixture block 13 and end ring 12 disappears, and end ring 12 is detached from from fixture block 13 along inclined-plane
Out, and under the squeezing action of packing element 10 it moves downward, packing element 10 unseals.Further, in the casing 15 in the downstream of end ring 12
Outer wall be equipped with collar part 17.As a result, when the extruding force between packing element 10 and open hole wall disappears, packer unit is integrally slided
Drop down onto collar part 17, it is upper mention casing 15 during packer reach well head together therewith, realize and salvage recycling operation.
The specifically used process of open hole packer of the invention is illustrated below.
After packer and casing 15 reach predetermined position, tripping in ball seat and the ball that builds the pressure into casing 15, then again to set
Highly pressurised liquid is injected in pipe 15, starts to set.Highly pressurised liquid enters the lower lantern between fluid cylinder 7 and inner sleeve 3 by flowing hole 7 '
It is empty.It can be cut after the pressure of the highly pressurised liquid in casing 15 increases to a certain extent and set shear pin positioned at the upper end of fluid cylinder 7
4, sealing ring 5 is equipped in the two sides for setting shear pin 4.Fluid cylinder 7 moves downward under highly pressurised liquid effect along casing 15, squeezes packing element
10 make its contraction, and packing element 10 blocks borehole wall annular space.It persistently builds the pressure and bleeds off pressure after a period of time, effect of the packing element 10 in anti-back circlip 6
Under, packing state is kept, completes to set.
After setting, the thawing of retaining ring 1 can be melted in hot environment after a period of time in thermal recovery, at this moment casing
Axial constraint between 15 and packer inner sleeve 3 disappears, and casing 15 can carry out axial free movement relative to packer.In depth
In well or ultradeep well, since the casing 15 of tripping in is longer, in underground, high temperature, which influences setting of casing 15, can generate very big axial deformation.
Since free axial movement may be implemented between casing 15 and packer, avoid in this way because 15 deflection of casing is excessive and
The packing effect for destroying packer, may be implemented the self compensation of 15 length of casing.
When encountering the downhole operations such as well workover or well-flushing, need to propose well by removing seal for packer and together with casing 15
Mouthful.The salvaging recycling operation of packer may be implemented in the solution of the present invention.Detailed process are as follows: fixture block 13 is therewith when above mentioning casing 15
Uplink a distance is fallen under the squeezing action of packing element 10 in deblocking groove (not regarding out).Between fixture block 13 and end ring 12
Axial constraint disappears, and end ring 12 is detached from fixture block 13 along inclined-plane, and is moved downward under the squeezing action of packing element 10, packing element
10 deblockings.Extruding force between packing element 10 and open hole wall disappears, and packer unit integrally slides to collar part 17, mentions upper
Packer reaches well head together therewith during casing 15, realizes and salvages recycling.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited to texts
Disclosed in specific embodiment, but include all technical solutions falling within the scope of the claims.
Claims (6)
1. a kind of open hole packer, is set on the outer wall of casing characterized by comprising
Inner sleeve is fixedly connected with described sleeve pipe；
Fluid cylinder, packing element and end ring are sequentially connected in series on the outer wall for being set to the inner sleeve；
It is with annular space between the fluid cylinder and the inner sleeve, being equipped on the wall of described sleeve pipe and inner sleeve can be with the annular space pair
Neat flowing hole；Wherein, retaining ring can be melted by being equipped at the both ends of the inner sleeve；
Shackle member is equipped between the end ring and the inner sleeve；
The shackle member is the fixture block for the outer wall for being embedded in the inner sleeve and protruding the inner sleeve, is equipped on the inner wall of the end ring
The clamping groove matched with the fixture block；
The inclined-plane of inclined downstream is configured with close to the upstream end of the end ring in the fixture block；
Deblocking groove is equipped on the sleeve outer wall of the upstream of the end ring.
2. open hole packer according to claim 1, which is characterized in that be equipped with and described sleeve pipe at the both ends of the inner sleeve
The fixed ring matched, the retaining ring that melts are arranged between the fixed ring and described sleeve pipe.
3. open hole packer according to claim 1, which is characterized in that be configured in the center of the inner wall of the packing element
The area Yi Peng.
4. open hole packer according to claim 3, which is characterized in that the area Yi Peng includes being set on the packing element
Groove and/or opening and the groove and/or opening peripheral region.
5. open hole packer according to claim 1, which is characterized in that be equipped with spring in the two sides of the packing element.
6. open hole packer according to claim 1, which is characterized in that set on the sleeve outer wall in the downstream of the end ring
There is collar part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510586590.5A CN106522871B (en) | 2015-09-15 | 2015-09-15 | A kind of open hole packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510586590.5A CN106522871B (en) | 2015-09-15 | 2015-09-15 | A kind of open hole packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106522871A CN106522871A (en) | 2017-03-22 |
| CN106522871B true CN106522871B (en) | 2019-04-05 |
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ID=58348684
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510586590.5A Active CN106522871B (en) | 2015-09-15 | 2015-09-15 | A kind of open hole packer |
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| CN (1) | CN106522871B (en) |
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| US8056628B2 (en) * | 2006-12-04 | 2011-11-15 | Schlumberger Technology Corporation | System and method for facilitating downhole operations |
| CN101864922B (en) * | 2010-07-02 | 2012-11-21 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Compression type dual-sealing open hole packer |
| CN202970607U (en) * | 2012-10-12 | 2013-06-05 | 中国石油天然气股份有限公司 | Casing deformation well high-temperature resistant dual-rubber-sleeve water plugging packer |
| CN202914019U (en) * | 2012-12-03 | 2013-05-01 | 中国石油集团渤海钻探工程有限公司 | Packer seat sealing mechanism for coiled tubing |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2449664C (en) * | 2001-06-05 | 2010-04-13 | Shell Canada Limited | In-situ casting of well equipment |
| WO2003083255A1 (en) * | 2002-03-28 | 2003-10-09 | Rawwater Engineering Company Limited | Sealing method and apparatus |
| CN201756937U (en) * | 2010-07-07 | 2011-03-09 | 沈阳新蓝天科技实业有限公司 | Oil well thermal recovery packer |
| CN201874516U (en) * | 2010-11-13 | 2011-06-22 | 东营市友佳石油机械有限公司 | Sectional well completion packer for thermal production of heavy oil wells |
| CN102518408A (en) * | 2011-12-07 | 2012-06-27 | 中国石油天然气股份有限公司 | Telescopic decompression type steam injection packer |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106522871A (en) | 2017-03-22 |
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