CN201196058Y - Inverted-extrusion tie-back seal plug used for oil well cementing - Google Patents
Inverted-extrusion tie-back seal plug used for oil well cementing Download PDFInfo
- Publication number
- CN201196058Y CN201196058Y CNU2008201081523U CN200820108152U CN201196058Y CN 201196058 Y CN201196058 Y CN 201196058Y CN U2008201081523 U CNU2008201081523 U CN U2008201081523U CN 200820108152 U CN200820108152 U CN 200820108152U CN 201196058 Y CN201196058 Y CN 201196058Y
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- China
- Prior art keywords
- cementing
- extrusion
- tie
- plug
- well
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- Expired - Lifetime
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Abstract
The utility model relates to the field of well drilling and well cementing techniques of oil wells, in particular to an anti-extrusion and tie-back sealing plug. To overcome the problems that the well cementing time is long and the cost is high due to the leakage of the oil wells in the prior art, the utility model provides the anti-extrusion and tie-back sealing plug for cementing wells in oil fields, which comprises an anti-extrusion joint, an adjustable extension and a tie-back plug, wherein the anti-extrusion joint is connected with the tie-back plug through the adjustable extension, a through-hole is arranged on the anti-extrusion joint, a sealing groove is arranged on the tie-back plug, and an O-shaped sealing ring is arranged in the sealing groove. Using one device to complete two techniques can be realized by the well cementing system, namely, the aim of using anti-extrusion cementing to complete the well cementing of absorption wells can be realized by the remedial measure for the leakage of the well cementing with tail pipe cementing, however, the positive cycle cementing technique can be realized through taking out the anti-extrusion joint when the tail pipe hanger gets out of order, the structure is simple, the construction is convenient, and the system has very strong economic benefits.
Description
Technical field
The utility model relates to oilwell drilling cementing technology field, is specifically related to a kind of anti-tieback sealing plug that squeezes that is used for oil well cementing.
Background technology
In oilfield explorating developing process, one of the biggest problem that often runs into is a down-hole leakage problem, during the absorption well well cementation, imappropriate as technical measures, cement paste leakage will take place in the cementing operation process, causes low the returning of cement paste and does not reach Geological Engineering requirement, oil, gas, effectively packing of water layer, inter-layer fluid is scurried mutually, can't carry out well stimulations such as normal oil-gas mining and acid fracturing.More seriously cement paste enters payzone in a large number, will stop up (or permanent obstruction) gas channel, and oil-gas Layer is caused great infringement, oil well productivity is reduced, even cause scrapping of oil gas well.So, say that to a certain extent the success or failure of absorption well well cementation not only can influence the oil gas well capacity, and will be related to the exploitation of oil gas and the discovery of new oil gas field.
The thinking that solves the well cementation leakage normally reduces the casing annulus equal yield density, makes it be lower than formation fracture pressure, and the method that is adopted has low-density cement mortar well cementation, stage cementing well cementation etc.It is more general that the cementing method of low-density cement mortar is used, but there are many deficiencies in the research of low-density cement mortar and application: the mortar architecture poor stability, free liquid content is big, fluid loss is big, compressive strength is lower, and along with the further reduction of cement slurry density, this limitation is more and more outstanding, and the reliability with stimulation work such as later stage acid fracturing is reduced; The well cementation of employing stage cementing, the working procedure complexity requires height to site tissue and equipment, and construction risk is bigger, and all there is the problem that the well cementation time is long, expense is high in these two kinds of methods well cementation.
Summary of the invention
In order to overcome in the prior art for solving the problem that the well cementation time is long, expense is high that the oil well leakage produces, the utility model provides a kind of anti-tieback sealing plug that squeezes that is used for oil well cementing, both can be implemented in and carried out the direct circulation cementing job when extension hanger breaks down, can when leakage takes place in the drilling liner cementing cementing, carry out the anti-cement squeeze work of annular space again simultaneously.
The technical solution adopted in the utility model is: a kind of anti-tieback sealing plug that squeezes that is used for oil well cementing, comprise anti-shove joint head, reducing pipe nipple, tieback plug, and the reducing pipe nipple couples together anti-shove joint head and tieback plug; Described anti-shove joint head is provided with through hole; Described tieback plug is provided with sealed groove, is provided with the O RunddichtringO in the sealed groove.
Compared with prior art, advantage of the present utility model is as follows:
The utility model can realize that a kind of device finishes two kinds of technologies, remedial measure after missing during promptly as the drilling liner cementing cementing, can realize that anti-squeezing off plays the purpose of absorption well well cementation, and extension hanger is when breaking down, anti-shove joint head is taken off and direct circulation cementing technology can be realized, and it is simple in structure, and easy construction has very strong economic benefit.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present utility model.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is done detailed description.
Referring to Fig. 1, the utility model is a kind of anti-tieback sealing plug that squeezes that is used for oil well cementing, comprises anti-shove joint head 1, reducing pipe nipple 2, tieback plug 3, and reducing pipe nipple 2 couples together anti-shove joint head 1 with tieback plug 3; Described anti-shove joint head 1 is provided with through hole 4; Described tieback plug is provided with sealed groove 5, is provided with the O RunddichtringO in the sealed groove.
The specific embodiment of the present utility model is in two kinds of situation:
1, do not have leakage and extension hanger when breaking down when the down-hole, as the tieback assembly seal failure, anti-shove joint head is backed out, the remaining part of plug inserts in the extension hanger tieback tube, realizes tieback and sealing, and cement still can direct circulation enter the shaft bottom;
When 2, leakage takes place in the drilling liner cementing cementing, cause oil reservoir to lose envelope, adopt anti-squeezing off technology, will instead squeeze the tieback sealing plug and insert in the tieback tube, after the pitching, cement can only enter annular space from through hole, from top to bottom the sealing borehole wall.
Simple in structure, the easy construction of the utility model, a device can be realized two kinds of functions, has very strong economic benefit.
Should be noted that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (1)
1. anti-tieback sealing plug that squeezes that is used for oil well cementing, it is characterized in that: comprise anti-shove joint head, reducing pipe nipple, tieback plug, the reducing pipe nipple couples together anti-shove joint head and tieback plug; Described anti-shove joint head is provided with through hole; Described tieback plug is provided with sealed groove, is provided with the O RunddichtringO in the sealed groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201081523U CN201196058Y (en) | 2008-05-23 | 2008-05-23 | Inverted-extrusion tie-back seal plug used for oil well cementing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201081523U CN201196058Y (en) | 2008-05-23 | 2008-05-23 | Inverted-extrusion tie-back seal plug used for oil well cementing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201196058Y true CN201196058Y (en) | 2009-02-18 |
Family
ID=40415694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201081523U Expired - Lifetime CN201196058Y (en) | 2008-05-23 | 2008-05-23 | Inverted-extrusion tie-back seal plug used for oil well cementing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201196058Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319604B (en) * | 2008-05-23 | 2012-08-22 | 安东石油技术（集团）有限公司 | Inverse squeezing tie-back sealing plug |
| CN107120090A (en) * | 2016-02-25 | 2017-09-01 | 中国石油化工股份有限公司 | Tieback assembly and tail pipe remedy cementing method |
-
2008
- 2008-05-23 CN CNU2008201081523U patent/CN201196058Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319604B (en) * | 2008-05-23 | 2012-08-22 | 安东石油技术（集团）有限公司 | Inverse squeezing tie-back sealing plug |
| CN107120090A (en) * | 2016-02-25 | 2017-09-01 | 中国石油化工股份有限公司 | Tieback assembly and tail pipe remedy cementing method |
| CN107120090B (en) * | 2016-02-25 | 2021-01-22 | 中国石油化工股份有限公司 | Tieback device and liner remedial cementing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090218 Effective date of abandoning: 20080523 |