CN107795286A - A kind of direct linkage type tubing and casing multistage air-tight structure - Google Patents
A kind of direct linkage type tubing and casing multistage air-tight structure Download PDFInfo
- Publication number
- CN107795286A CN107795286A CN201711168200.8A CN201711168200A CN107795286A CN 107795286 A CN107795286 A CN 107795286A CN 201711168200 A CN201711168200 A CN 201711168200A CN 107795286 A CN107795286 A CN 107795286A
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- CN
- China
- Prior art keywords
- cylinder
- conical surface
- inner conical
- strobilus masculinus
- male cone
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
Abstract
The present invention provides a kind of suitable for deep-well, the direct linkage type tubing and casing multistage air-tight structure of ultradeep well, including the first end external screw thread linkage section of oil jacket tube body and the second end internal thread linkage section.The external screw thread linkage section is disposed with end face shoulder, male cone (strobilus masculinus), first order cylinder, external screw thread, second level cylinder, inner conical surface by outer lateral centre, and the internal thread linkage section is disposed with the reverse shoulder of only moment of torsion, inner conical surface, Internal Spherical Surface, internal thread, cylinder, male cone (strobilus masculinus)；When tubing and casing connects, male cone (strobilus masculinus) is interference fitted to form first order compound sealing structure with inner conical surface, first order cylinder and Internal Spherical Surface, and second level cylinder is interference fitted to form second level compound sealing structure with cylinder, inner conical surface and male cone (strobilus masculinus).The present invention has multistage composite sealing structure, has good sealing property, the other end can also play effective sealing function during seal failure in tubing and casing one end, substantially increase the reliability and stability of sealing, improve sealing service life.
Description
Technical field
The present invention relates to a kind of oil tubing and casing connection apparatus field, more particularly to a kind of direct linkage type tubing and casing multistage are airtight
Seal structure.
Background technology
Oil tubing and casing be exploit oil and natural gas important tool, during oil recovery, it be connection ground and
The hinge of underground.With continuing to increase for current exploitation of oil-gas field dynamics both at home and abroad, especially bored in small clearance cementing, slim-hole
It is also more and more to the demand of the direct linkage type tubing and casing without box cupling in well, casing damaged well when lower small casing well workover.
It is oil tubing and casing high sealing, high intensity under complex hole condition to influence one of key factor of oil and gas exploitation
The quality of performance.In air-fuel mixture well and gas well, the Special threading connectors for using single-stage shape metallic leak-proof structure, tubing and casing exists more
Lower well operations, when bearing larger axial load or bending load, single-stage sealing surface or torque shoulder once it is impaired or occur compared with
Big deformation, the sealability of joint will be reduced substantially, or even failure accidents occur.
Direct linkage type tubing and casing multistage air-tight structure using the conical surface to the conical surface, sphere to the face of cylinder, the face of cylinder to the face of cylinder,
The conical surface forms multistage composite sealing structure, has good sealing property to the new structure form of conical surface level Four seal combination.
The other end can also play effective sealing function during the seal failure of tubing and casing one end, can significantly overcome tubing and casing under complex hole condition
Reveal the situation of failure.
The content of the invention
The purpose of the present invention be for solve existing direct linkage type tubing and casing under the complex hole conditions such as high pressure, super-pressure it is existing close
A kind of the problem of sealing property difference, there is provided direct linkage type tubing and casing multistage air-tight structure.
The present invention to achieve the above object, using following technical scheme：A kind of direct linkage type tubing and casing multistage of the present invention is airtight
Seal structure, including the first end external screw thread linkage section of oil pipe body and the second end internal thread linkage section.The external screw thread linkage section
End face shoulder, male cone (strobilus masculinus), first order cylinder, external screw thread, second level cylinder, inner conical surface, institute are disposed with by outer lateral centre
State internal thread linkage section and be disposed with the reverse shoulder of only moment of torsion, inner conical surface, Internal Spherical Surface, internal thread, cylinder, male cone (strobilus masculinus).Oil jacket
When pipe connects, the male cone (strobilus masculinus) and inner conical surface, first order cylinder and Internal Spherical Surface, second level cylinder and cylinder, inner conical surface and outer cone
Face is interference fitted to form level Four sealing structure, and the external screw thread engages with the buttress thread of internal thread, the end face shoulder with
Only the reverse shoulder of moment of torsion is perfectly aligned, in the case where ensureing the bonding strength and anti-tripping ability of tubing and casing junction, greatly enhancing
Sealing property, substantially increases sealing service life.
The male cone (strobilus masculinus) is interference fitted to form first order compound sealing structure with inner conical surface, first order cylinder and Internal Spherical Surface,
Second level cylinder is interference fitted to form second level compound sealing structure with cylinder, inner conical surface and male cone (strobilus masculinus).Multistage composite sealing knot
Structure, there is good, lasting sealing property, when one end seal failure of tubing and casing shoulder, the other end can also play
The sealing function of effect, seal request during different operating modes can be met, substantially increase the reliability and stability of the oil jacket seal of tube.
Compared with prior art, the technical effects of the invention are that：1st, using male cone (strobilus masculinus) and inner cone surface seal structure, sphere
With the interference fit of cylinder sealing structure, cylinder and cylinder sealing structure, inner conical surface and outer cone surface seal structure, it is close to form level Four
Seal structure ensures that tubing and casing junction has excellent sealing performance for a long time, substantially increases sealing service life；2nd, in tubing and casing
The other end can also play effective sealing function during the seal failure of one end, can significantly overcome tubing and casing leakage under complex hole condition to lose
The situation of effect；3rd, the male cone (strobilus masculinus) of the inner conical surface of external screw thread linkage section and internal thread linkage section is interference fitted, and is played and is anchored in auxiliary
Position, the anti-effect crossed moment of torsion, reduce stress concentration at shoulder.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of the external screw thread linkage section in the present invention.
Fig. 3 is the structural representation of the internal thread linkage section in the present invention.
Enlarged drawing when Fig. 4 is the tubing and casing connection in the present invention.
Fig. 5 is the enlarged drawing of the first order compound sealing structure in the present invention.
Fig. 6 is the enlarged drawing of the second level compound sealing structure in the present invention.
Wherein：1. external screw thread linkage section；2. internal thread linkage section；3. end face shoulder；4. ball face sealing structure；5. the first order
Cylinder；6. external screw thread；7. second level cylinder；8. inner conical surface；9. the only reverse shoulder of moment of torsion；10. inner conical surface；11. Internal Spherical Surface；12.
Internal thread；13. cylinder；14. male cone (strobilus masculinus).
Embodiment
Below in conjunction with the accompanying drawings and embodiment is described further to the present invention.
As shown in figure 1, the present invention provides a kind of direct linkage type tubing and casing multistage air-tight structure, the tubing and casing includes outer spiral shell
Line linkage section 1, internal thread linkage section 2 and end face shoulder 3, male cone (strobilus masculinus) 4, first order cylinder 5, external screw thread 6, second level cylinder 7,
Inner conical surface 8, the only reverse shoulder 9 of moment of torsion, inner conical surface 10, Internal Spherical Surface 11, internal thread 12, cylinder 13, male cone (strobilus masculinus) 14.
As shown in figure 4, when tubing and casing connects, the external screw thread 6 engages with the buttress thread of internal thread 12；The end face
The shoulder 9 reverse with only moment of torsion of shoulder 3 is perfectly aligned；The male cone (strobilus masculinus) 4 of the external screw thread linkage section 1 is interior with internal thread linkage section 2
The conical surface 10, the inner conical surface 8 of external screw thread linkage section 1 are formed close with the male cone (strobilus masculinus) 14 of internal thread linkage section 2 by axially interference fit
Seal structure, the first order cylinder 5 of the external screw thread linkage section 1 and the Internal Spherical Surface 11 of internal thread linkage section 2, external screw thread linkage section 1
The cylinder 13 of second level cylinder 7 and internal thread linkage section 2 sealing structure is formed by radial interference fit.
Simple and reasonable for structure present invention employs direct linkage type tubing and casing, safe and convenient to use, level Four sealing structure can be with
Good, long-term sealing effectiveness is effectively played, seal request during different operating modes can be met, substantially increases the reliable of sealing
Property and stability, it is ensured that the service life of sealing mechanism.
Claims (2)
1. a kind of direct linkage type tubing and casing multistage air-tight structure, including the first end external screw thread linkage section (1) of oil pipe body and
Two end internal thread linkage sections (2), it is characterised in that：The external screw thread linkage section (1) is disposed with end face by outer lateral centre
Shoulder (3), male cone (strobilus masculinus) (4), first order cylinder (5), external screw thread (6), second level cylinder (7), inner conical surface (8)；Accordingly, it is described
Internal thread linkage section is disposed with the reverse shoulder of only moment of torsion (9), inner conical surface (10), Internal Spherical Surface (11), internal thread (12), cylinder
(13), male cone (strobilus masculinus) (14)；When oil pipe connects, the external screw thread (6) is engaged with the buttress thread of internal thread (12), the end face
Shoulder (3) and the reverse shoulder of only moment of torsion (9) are perfectly aligned, and the male cone (strobilus masculinus) (4) forms sealing structure with inner conical surface (10), described
First order cylinder (5) forms sealing structure with Internal Spherical Surface (11), and the second level cylinder (7) forms sealing knot with cylinder (13)
Structure, the inner conical surface (8) form sealing structure with male cone (strobilus masculinus) (14).
2. direct linkage type tubing and casing multistage air-tight structure according to claim 1, it is characterised in that：The male cone (strobilus masculinus) (4)
It is interference fitted with inner conical surface (10), first order cylinder (5) with Internal Spherical Surface (11) and forms first order compound sealing structure, described second
Level cylinder (7) forms second level compound sealing structure with cylinder (13), the inner conical surface (8) and male cone (strobilus masculinus) (14) interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711168200.8A CN107795286A (en) | 2017-11-21 | 2017-11-21 | A kind of direct linkage type tubing and casing multistage air-tight structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711168200.8A CN107795286A (en) | 2017-11-21 | 2017-11-21 | A kind of direct linkage type tubing and casing multistage air-tight structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107795286A true CN107795286A (en) | 2018-03-13 |
Family
ID=61535570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711168200.8A Pending CN107795286A (en) | 2017-11-21 | 2017-11-21 | A kind of direct linkage type tubing and casing multistage air-tight structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107795286A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201013257Y (en) * | 2007-02-16 | 2008-01-30 | 陆金福 | Oil pipe coupling |
| CN202000917U (en) * | 2011-04-25 | 2011-10-05 | 达力普石油专用管有限公司 | Twist-checking shoulder buttress thread oil casing pipe |
| CN202380985U (en) * | 2011-09-16 | 2012-08-15 | 中国石油化工股份有限公司 | Tubular air seal thread joint |
| CN203188921U (en) * | 2013-02-18 | 2013-09-11 | 江苏诚德钢管股份有限公司 | Air-tight seal buckling mold |
| CN203296710U (en) * | 2013-05-30 | 2013-11-20 | 中宏兴石油设备(北京)有限公司 | Oil casing |
| US20150008667A1 (en) * | 2010-11-29 | 2015-01-08 | Boris Yur'evich Shcherbakov | Tightly threaded joint for oil field pipes |
| CN205314940U (en) * | 2015-12-16 | 2016-06-15 | 天津钢管集团股份有限公司 | Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread |
-
2017
- 2017-11-21 CN CN201711168200.8A patent/CN107795286A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201013257Y (en) * | 2007-02-16 | 2008-01-30 | 陆金福 | Oil pipe coupling |
| US20150008667A1 (en) * | 2010-11-29 | 2015-01-08 | Boris Yur'evich Shcherbakov | Tightly threaded joint for oil field pipes |
| CN202000917U (en) * | 2011-04-25 | 2011-10-05 | 达力普石油专用管有限公司 | Twist-checking shoulder buttress thread oil casing pipe |
| CN202380985U (en) * | 2011-09-16 | 2012-08-15 | 中国石油化工股份有限公司 | Tubular air seal thread joint |
| CN203188921U (en) * | 2013-02-18 | 2013-09-11 | 江苏诚德钢管股份有限公司 | Air-tight seal buckling mold |
| CN203296710U (en) * | 2013-05-30 | 2013-11-20 | 中宏兴石油设备(北京)有限公司 | Oil casing |
| CN205314940U (en) * | 2015-12-16 | 2016-06-15 | 天津钢管集团股份有限公司 | Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread |
Non-Patent Citations (1)
| Title |
|---|
| 大港油田集团钻采工艺研究院: "《国内外钻井与采油设备新技术》", 31 January 2015, 中国石化出版社 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180313 |
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| RJ01 | Rejection of invention patent application after publication |