CN203835327U - Cement retainer - Google Patents

Cement retainer Download PDF

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Publication number
CN203835327U
CN203835327U CN201420153820.XU CN201420153820U CN203835327U CN 203835327 U CN203835327 U CN 203835327U CN 201420153820 U CN201420153820 U CN 201420153820U CN 203835327 U CN203835327 U CN 203835327U
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CN
China
Prior art keywords
slips
central tube
valve
cone
cement retainer
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Active
Application number
CN201420153820.XU
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Chinese (zh)
Inventor
王延浩
谭莲香
邹刚
宁祎
杨小城
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SJS Ltd
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SJS Ltd
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Priority to CN201420153820.XU priority Critical patent/CN203835327U/en
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Publication of CN203835327U publication Critical patent/CN203835327U/en
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Abstract

The utility model discloses a cement retainer which comprises a center pipe, an upper slip sleeving the top end of the outer wall of the center pipe, and a lower slip sleeving the lower part of the outer wall of the center pipe, and is characterized in that a reducing step is arranged on the outer diameter of the center pipe; a uniform distribution hole is formed in the maximum outer diameter; a shear pin is arranged in the uniform distribution hole; clearances are reserved between the upper slip and the center pipe as well as between the lower slip and the center pipe; an upper cone and a lower cone are respectively wedged into the clearances between the upper slip and the center pipe as well as between the lower slip and the center pipe; a rubber sleeve is arranged between the upper cone and the lower cone in the axial direction; the lower end of the outer wall of the center pipe is also connected with a sleeve valve; one end of a valve body is arranged at the lower end of the inner wall of the center pipe, and the other end of the valve body extends into the sleeve valve; a sealing mechanism is arranged between the valve body and the inner wall of the sleeve valve. The cement retainer has the advantages that setting is difficult during pipe column arrangement; furthermore, the setting success rate is high, and the blocking effect is good.

Description

A kind of cement retainer
Technical field
?the utility model relates to a kind of oil drilling and extracting equipment, particularly a kind of cement retainer.
Background technology
Middle-late Development Stages of Oil Fields In Other Countries is high above casing corrosion perforation because oil well cement returns, there is seepage in well cementing of cement section, make the formation water of the contiguous high pressure water layer of oil reservoir flow into pit shaft, or the contiguous high pressure water layer of oil reservoir energy decreases alters mutually and cause well water rising or reservoir water flooding with oil reservoir, to oil field development, bring exceptional hardship.Some produce OW for many years at present, long-term high moisture, in closing well state, analyze judgement: the one, and through long-term exploitation, the perforation of potential oil zone casing corrosion, casing leakage causes reservoir water flooding; The 2nd, the long-term high pressure water injection of possible high-pressure water injection well, forms head cone and then causes reservoir water flooding with this well oil reservoir.The 3rd, may near oil reservoir, there be high pressure water layer and oil reservoir to alter mutually and cause reservoir water flooding.These wells are looked for to the possibility of omitting in printing except casing corrosion perforation leakage by packer.Adopt radioisotope logging, find to have in oil reservoir bottom a contiguous high pressure water layer and oil reservoir to alter mutually, make this well all produce water.
For this situation, conventional processing method is first at high pressure water layer, to penetrate out engineering hole, then high pressure water layer is carried out to chemical plugging---be mainly cement paste shutoff.After shutoff is complete, again cement plug is bored and opened, then recover the exploitation of oil reservoir.But the production oil reservoir of this well is on high pressure water layer and adjacent very near, use conventional method for blocking not only in engineering construction with very large risk, and be difficult to guarantee that oil reservoir is not stopped up by cement paste, particularly high pressure water layer is squeezed stifled, likely there is the outer guttation mud of high pressure water layer, make to squeeze and block up unsuccessfully.So only have employing to be lowered to instrument, oil reservoir and high pressure water layer adjacent with it are separated, then high pressure water layer is carried out to shutoff.
Cement retainer has been used a lot of years, traditional cement retainer adopts metal material, by drilling rod or oil pipe G.I.H, although conventional cement retainer good airproof performance, withstand voltage difference is high, the sealing time is long, also can milling, but when milling, easily occur setting midway, the cost of milling time is longer, metal fragment after milling is than great, and therefore the row's of returning difficulty is necessary to develop a kind of tool and solves the problems referred to above at quick drill except the composite material cement retainer of performance.
Utility model content
The purpose of this utility model is to provide a kind of cement retainer, and he is not only difficult for during lower tubular column setting midway, and it is high to set success rate, and plugging effect is good.
The technical scheme that realizes the utility model object is: a kind of cement retainer, comprise central tube, be placed on the upper slips on central tube outer wall top and the lower slips that is placed on central tube outer wall bottom, it is characterized in that: described central tube external diameter has reducing step, maximum outside diameter place is provided with uniform hole, there is shear pin to be arranged in uniform hole, described is upper, between lower slips and central tube, all there is gap, on having, lower cone is wedged respectively, among gap between lower slips and central tube, described is upper, between lower cone, be furnished with vertically packing element, described central tube outer wall lower end is also connected with sleeving valve, having a valve body one end to be arranged on the central tube inwall lower end other end extends in this sleeving valve, between described valve body and sleeving valve inwall, be provided with sealing mechanism.
And described upper slips is comprised of four slips, along upper slips inwall, be provided with flexible strip and aluminium strip, there is clip to be placed on the outer wall of this upper slips.
And the described lower slips structure that is formed in one.
And between described described upper and lower slips and upper/lower cone for the conical surface contacts, the fit angle of its conical surface is 12~20 °.
And by pin, be connected between described upper cone and central tube, described lower cone and central tube are that key is joined merga pass pin and fixed.
And described valve body upper end edge axially has 2~4 uniform grooves.
And described sealing mechanism is comprised of Sealing shield ring, seal valve back band assembly and second " O " shape sealing ring, sealing mechanism is by a series of holes sealing of sleeving valve upper end.
And be provided with back band between described upper/lower cone and packing element, and this back band is comprised of inside and outside back band, and the jut on described outer back band matches with the recess on interior back band.
And between described packing element and central tube, also there is first " O " shape sealing ring and stay ring for fixing holding of this first " O " shape sealing ring.
The utility model has the advantage of: 1. external diameter is less, be difficult for setting during lower tubular column midway, the arc spring formula that is slightly larger than the setting tool of casing inner diameter is close to internal surface of sleeve pipe and has been beneficial to and sets; 2. each group of bi-directional slip can guarantee the success rate that bridging plug sets up and down, good to the plugging effect of pit shaft; 3. at cement paste, squeeze in stifled process, its inner equilibrated valve can successfully prevent from returning on cement paste, avoids the generation of cement obstruction accident in cement paste bit freezing and oil pipe.
Accompanying drawing explanation
Fig. 1 is the structural representation of cement retainer;
Fig. 2 is the use state reference map of cement retainer.
Wherein, 1, upper slips 2, clip, 3, rivet, 4, flexible strip, 5, aluminium strip, 6, shear pin, 7, pin, 8, lock ring, 9, upper cone, 10, baffle ring, 11, outer back band, 12, interior back band, 13, packing element, 14, hold and stay ring, 15, first " O " RunddichtringO, 18, lower cone, 19, key, 20, central tube, 21, lower slips, 22, holding screw, 23, sleeving valve, 24, second " O " RunddichtringO, 25, valve body, 26, Sealing shield ring, 27, seal valve back band assembly, 28, receive sword cover
31, upper end joint, 32, setting tool central tube, 33, upper end lining, 34, upper end back-up ring, 35, the first soket head cap screw, 36, spring leaf, 37, axial elasticity back-up ring, 38, lower end back-up ring, 39, lower end lining, 40, control cover, 41, the second soket head cap screw, 42, the 3rd soket head cap screw, 43, control nut-welding assembly, 44, control nut back-up ring, 45, support set, 46, setting tool first " O " RunddichtringO, 47, holding screw, 48, cam bit, 49, pin, 50, complex spring, 51, setting cover, 52, control flexible connector, 53, insert joint, 54, joint ring assembly, 55, setting tool second " O " RunddichtringO, 56, phase shift joint, 57, the 4th soket head cap screw.
The specific embodiment
Referring to Fig. 1~2, below with reference to embodiment, the utility model is described further.
A kind of oil drilling and extracting equipment, a kind of cement retainer particularly, comprise central tube 20, the lower slips 21 that is placed on the upper slips 1 on central tube 20 outer wall tops and is placed on central tube 20 outer wall bottoms, it is characterized in that: described central tube 20 external diameters have reducing step, maximum outside diameter place is provided with uniform hole, there is shear pin 6 to be arranged in uniform hole, described is upper, lower slips 1, 21 and central tube 20 between all there is gap, on having, lower cone 9, 18 wedge respectively, lower slips 1, 21 and the gap of 20 of central tubes among, described is upper, lower cone 9, between 18, be furnished with vertically packing element 13, described central tube 20 outer wall lower ends are also connected with sleeving valve 23, having valve body 25 one end to be arranged on the central tube 20 inwall lower end other ends extends in this sleeving valve 23, between described valve body 25 and sleeving valve 23 inwalls, be provided with sealing mechanism.
During work, utilize drilling rod or oil pipe to carry cement retainer and corresponding mechanical setting tool, arrive behind desired setting position, will on tubing string, carry 0.6 meter, it provides release upper slips 1 and has controlled the necessary stroke of flexible connector 52, fully dextrorotation tubing string, more than using setting tool dextrorotation at least 10 circles, discharges control cover 40 by controlling the screw thread back-out of nut 43 from central tube 20, again transfer tubing string to predetermined setting position, frictional force between camber spring 36 and sleeve pipe can make to control cover 40 and keep motionless with setting sleeve 51, transferring action can release upper slips 1 from setting sleeve 51, now, flexible strip 4 in upper slips 1 can make upper slips 1 be close on casing wall, in the process being released at upper slips 1, support set 45 is thrown off from cam bit 48, cam bit 48 is ejected, thereby control flexible connector 52, from inserting joint 53, be released, making can have certain motion to axial between them, because previous upper slips 1 has been close to internal surface of sleeve pipe when discharging, slow upper lifting pipe post, make setting tool bear corresponding pulling force, setting tool connects the central tube 20 upper end screw threads of cement retainer by controlling flexible connector 52, central tube 20 drives valve pocket 23 up, it is up that valve pocket 23 promotes lower end slips 21, lower end slips 21 is cut off the second pin 29, pushing away lower outside back band 17, in lower, back band 16 and packing element 13 are up, packing element 13 stays ring 14 with holding, in upper, back band 12 and upper outside back band 11 upwards push upper cone 9, it is up and push upper slips 1 that upper cone 9 is cut off the rear continuation of the first pin 7, make upper slips 1 further nip in sleeve pipe, continue upper lifting pipe post, packing element 13 further compresses and is adjacent to internal surface of sleeve pipe, lower end slips 21 breaks and stings on internal surface of sleeve pipe, at this moment the sawtooth of lock ring 8 is locked on central tube 20 sawtooth, maintain packing element 13 setting, more than dextrorotation machinery setting tool 10 circles, this is the shear screw 6 of cutting off on cement retainer, and makes to control flexible connector 52 and screw out from cement retainer, then on carry until give up, slowly transfer tubing string, make intubate open valve body 25, according to working design, start mixed slurry squeezing off, squeezed after cement, with respect to holding to stay on device, carry behind 0.5 meter of left and right, get final product valve body, anti-circulation well cleanup, replaces out the unnecessary mud in tubing string.
And described upper slips 1 is comprised of four slips, along upper slips 1 inwall, be provided with flexible strip 4 and aluminium strip 5, there is clip 2 to be placed on the outer wall of this upper slips 1.
Upper slips 1 is fixing by flexible strip 4, aluminium strip 5 and clip 2.
Further technical scheme can be that described lower slips 21 is integral forming structure.
The split-type structure of upper slips 1 is with respect to lower slips 2 integral forming structures, when setting, upper slips 1 promotes upper cone 9 extruding packing elements 13 before this, when extruding force reaches lower slips 21 and breaks value, lower slips 21 just breaks and stings on sleeve pipe, and such mode that sets is used in packing element sealing.
And between described described upper and lower slips 1,21 and upper/lower cone 9,18 for the conical surface contacts, the fit angle of its conical surface is 12~20 °.
The fit angle of the conical surface is 12~20 °, and the low-angle conical surface is conducive to the transmission of axial force, and the extruding and the upper and lower slips 1,21 that are conducive to packing element are bitten sleeve pipe, and this fit angle is conducive to slips and interpyramidal self-locking.
And by pin 7, be connected between described upper cone 9 and central tube 20, described lower cone 18 is joined merga pass pin 7 with central tube 20 for key and is fixed.
Upper/lower cone 9,18 is connected with central tube 20 by pin 7, can prevent cement retainer premature setting in the process of going into the well.
Further technical scheme can be also that described valve body 25 upper end edges axially have 2~4 uniform grooves.
At valve body 25 upper end edges, axially have 2~4 uniform grooves, make the upper end of valve body 25 there is certain elasticity.
And described sealing mechanism is comprised of Sealing shield ring 26, seal valve back band assembly 27 and second " O " shape sealing ring 24, sealing mechanism is by a series of holes sealing of sleeving valve 23 upper ends.
The a series of holes that seal sleeving valve 23 upper ends by the sealing mechanism between valve body 25 and sleeving valve 23 seal.
And be provided with back band between described upper/lower cone 9,18 and packing element 13, and this back band is comprised of inside and outside back band 11,12, and the jut on described outer back band 11 matches with the recess on interior back band 12.
The connected mode that adopts jut on outer back band 11 to match with recess on interior back band 12, stabilized structure, is difficult for getting loose.
Further technical scheme can also be described packing element 13 with central tube 20 between also there is first " O " shape sealing ring 15 and stay and encircle 14 for fixing holding of this first " O " shape sealing ring 15.
Packing element 13 can produce blow-up effect when extruding, packing element 13 sealing cement retainers and casing annulus and packing element 13 and central tube 20, simultaneously packing element 13 stays ring 14 sealings, first " O " shape sealing ring 15 to be used to further sealing to hold and stay ring 14 and central tube 20 with holding.
The utility model patent application is on the same day, with regard to same subject application patent of invention.

Claims (9)

1. a cement retainer, comprise central tube, be placed on the upper slips on central tube outer wall top and the lower slips that is placed on central tube outer wall bottom, it is characterized in that: described central tube external diameter has reducing step, maximum outside diameter place is provided with uniform hole, there is shear pin to be arranged in uniform hole, described is upper, between lower slips and central tube, all there is gap, on having, lower cone is wedged respectively, among gap between lower slips and central tube, described is upper, between lower cone, be furnished with vertically packing element, described central tube outer wall lower end is also connected with sleeving valve, having a valve body one end to be arranged on the central tube inwall lower end other end extends in this sleeving valve, between described valve body and sleeving valve inwall, be provided with sealing mechanism.
2. a kind of cement retainer according to claim 1, is characterized in that: described upper slips is comprised of four slips, along upper slips inwall, is provided with flexible strip and aluminium strip, has clip to be placed on the outer wall of this upper slips.
3. a kind of cement retainer according to claim 1, is characterized in that: the described lower slips structure that is formed in one.
4. a kind of cement retainer according to claim 1, is characterized in that: between described described upper and lower slips and upper/lower cone, for the conical surface contacts, the fit angle of its conical surface is 12~20 °.
5. according to a kind of cement retainer described in claim 1 or 4, it is characterized in that: between described upper cone and central tube, by pin, be connected, described lower cone and central tube are that key is joined merga pass pin and fixed.
6. a kind of cement retainer according to claim 1, is characterized in that: described valve body upper end edge axially has 2~4 uniform grooves.
7. a kind of cement retainer according to claim 1, is characterized in that: described sealing mechanism is comprised of Sealing shield ring, seal valve back band assembly and second " O " shape sealing ring, and sealing mechanism is by a series of holes sealing of sleeving valve upper end.
8. a kind of cement retainer according to claim 1, it is characterized in that: between described upper/lower cone and packing element, be provided with back band, this back band is comprised of inside and outside back band, and the jut on described outer back band matches with the recess on interior back band.
9. a kind of cement retainer according to claim 1, is characterized in that: between described packing element and central tube, also have first " O " shape sealing ring and stay ring for fixing holding of this first " O " shape sealing ring.
CN201420153820.XU 2014-04-01 2014-04-01 Cement retainer Active CN203835327U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420153820.XU CN203835327U (en) 2014-04-01 2014-04-01 Cement retainer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420153820.XU CN203835327U (en) 2014-04-01 2014-04-01 Cement retainer

Publications (1)

Publication Number Publication Date
CN203835327U true CN203835327U (en) 2014-09-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420153820.XU Active CN203835327U (en) 2014-04-01 2014-04-01 Cement retainer

Country Status (1)

Country Link
CN (1) CN203835327U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103912237A (en) * 2014-04-01 2014-07-09 四机赛瓦石油钻采设备有限公司 Cement bearing and retaining unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103912237A (en) * 2014-04-01 2014-07-09 四机赛瓦石油钻采设备有限公司 Cement bearing and retaining unit

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