CN201723171U - Oil casing connector for narrow-gap well cementation - Google Patents
Oil casing connector for narrow-gap well cementation Download PDFInfo
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- CN201723171U CN201723171U CN2010202539907U CN201020253990U CN201723171U CN 201723171 U CN201723171 U CN 201723171U CN 2010202539907 U CN2010202539907 U CN 2010202539907U CN 201020253990 U CN201020253990 U CN 201020253990U CN 201723171 U CN201723171 U CN 201723171U
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- torque shoulder
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- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000003208 petroleum Substances 0.000 claims description 15
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model relates to an oil casing connector for narrow-gap well cementation, which is a taper pipe thread connector with a taper of 1:16. The oil casing connector is fabricated by screwing an externally threaded part and a jointed coupling together and characterized in that external threads, an external sealing face and an external torque shoulder are arranged on the externally threaded part; internal threads, an internal sealing face and an internal torque shoulder are arranged on the jointed coupling; and the internal sealing face on the jointed coupling and the external sealing face on the externally threaded part are in close contact, so are the internal torque shoulder on the jointed coupling and the external torque shoulder on the externally threaded part and the internal threads on the jointed coupling and the external threads on the externally threaded part, thus forming interference fit. The pitch diameter of the external threads is Ep and that of the internal threads is Eb. Ep - Eb = (0.15-0.35) mm. The oil casing connector has the advantages that (1) the outer diameter of the jointed coupling is smaller than that of the prior art, thus increasing the well cementation gap of the casing; and (2) compared with API narrow-gap casing, the sealing performance and internal pressure strength as well as the joint strength are significantly improved.
Description
Technical field
The utility model relates to a kind of petroleum sleeve joint, and especially a kind of petroleum sleeve joint that is applicable to the well cementation of narrow gap belongs to the petroleum casing pipe technical field that is threaded.
Background technology
Petroleum casing pipe couples together by nipple, forms to reach thousands of meters tubing string.Drilling technology requires regulation, and well cementation gap minimum should be not less than 12.7mm, otherwise cementing quality is difficult to or can't guarantees at all.At present, the petroleum casing pipe of Oilfield using is API (the American Petroleum Institute of American Petroleum Institute (API)) threaded sleeve mostly, though coupling length has only 0.5～2.0% of body length, but external diameter is generally than the big 25.4～38.1mm of body external diameter, and this well cementation gap of causing the box cupling position is much smaller than body.
For this reason, API has provided a kind of narrow gap sleeve pipe, has reduced the box cupling external diameter.The connecting thread of this sleeve pipe adopts the API buttress thread, and the box cupling external diameter obviously reduces, but shortcoming be sealing performance especially gas sealing ability is poor, bonding strength, internal pressure strength also obviously descend simultaneously.Sleeve pipe with the C95 grade of steel of Φ 273.1 * 12.57mm is an example, adopt the narrow gap of API sleeve pipe after, the bonding strength of joint descends 24%, internal pressure strength descends 26% more than.
Find by prior art documents, the Chinese patent publication number is CN2937445, in open day on August 22nd, 2007, the utility model name is called " petroleum sleeve joint that is applicable to the well cementation of narrow gap ", this patent disclosure a kind of petroleum sleeve joint that is applicable to the well cementation of narrow gap.The box cupling external diameter of the box cupling external diameter of this casing joint and API narrow gap casing joint is suitable, but by increasing metal/metal hermetically-sealed construction and torque shoulder structure, make the sealing performance of the utility model joint, anti-interior pressure energy power all be higher than API narrow gap casing joint, even be higher than common API joint.The utility model is as general as the sleeve pipe that tapered thread connects, its tapering is 1: 16, it comprises box cupling and external thread piece two parts, it is characterized by: be processed with internal thread, metallic sealing section and torque shoulder on box cupling, be processed with external screw thread, metallic seal and torque shoulder on external thread piece.After joint was tightened, the metallic sealing section on the box cupling closely contacted with metallic seal on the external thread piece, formed interference fit, played main sealing function.Simultaneously, after joint was tightened, the internal torque shoulder closely contacted with outer torque shoulder, also forms interference fit, plays the auxiliary seal effect.Through after the above-mentioned improvement, to compare with the narrow gap of API sleeve pipe, the sealing performance of joint and internal pressure strength improve, but bonding strength does not improve.Simultaneously, the utility model has the clear and definite scope of application, W=W1-(3.2～13.7) mm, be that the box cupling external diameter is than API external diameter little (3.2～13.7) mm, if require the box cupling external diameter further to reduce, exceeded this scope, reach special narrow interstice coverage, this moment is if still adopt present technique, situation as shown in Figure 2 then can appear: under the tensile load effect, the dangerouse cross-section area A b and the Ap of box cupling and external thread piece seriously do not match (Ab is much smaller than Ap), and box cupling is at first at dangerouse cross-section place fracture failure, the performance useless of the potentiality of external thread piece.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of sealing performance and internal pressure strength the high petroleum sleeve joint that is applicable to the well cementation of narrow gap.
The technical scheme that provides according to the utility model, the described petroleum sleeve joint that is applicable to the well cementation of narrow gap, be that a kind of tapering is 1: 16 a taper pipe thread joint, form by external thread piece and stubborn the connecing of box cupling two parts, feature is: on external screw element, be processed with external screw thread, external seal face and outside torque shoulder, on box cupling, be processed with internal thread, inner sealing surface and internal torque shoulder; Inner sealing surface on the box cupling closely contacts with external seal face on the external thread piece, and the internal torque shoulder on the box cupling closely contacts with outer torque shoulder on the external thread piece, and the internal thread on the box cupling closely contacts with external screw thread on the external thread piece, forms interference fit.
Described externally threaded middle footpath is Ep; The middle footpath of described internal thread is Eb; Ep-Eb=(0.15～0.35) mm.
The utility model compared with prior art, the advantage that has is: (1) box cupling external diameter is littler than prior art, has increased the well cementation gap of sleeve pipe; (2) compare with the narrow gap of API sleeve pipe, not only sealing performance and internal pressure strength improve, and bonding strength also obviously improves.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
The specific embodiment
As shown in Figure 1: petroleum sleeve joint comprises external thread piece 1, external screw thread 2, external seal face 3, outer torque shoulder 4, box cupling 5, inner sealing surface 6, internal torque shoulder 7, internal thread 8 etc.
Embodiment one, and first embodiment of the design is the sleeve pipe that is used for Φ 273.05 * 12.57mm, and grade of steel is C95.The external diameter W=282mm of box cupling 5 (the external diameter W of common box cupling
1=298.45mm, the external diameter of the narrow gap of API box cupling is 285.75mm).On external screw element 1, be processed with external screw thread 2, external seal face 3 and outside torque shoulder 4, on box cupling 5, be processed with internal thread 8, inner sealing surface 6 and internal torque shoulder 7; Inner sealing surface 6 on the box cupling 5 closely contacts with external seal face 3 on the external thread piece 1, internal torque shoulder 7 on the box cupling 5 closely contacts with outer torque shoulder 4 on the external thread piece 1, internal thread 8 on the box cupling 5 closely contacts with external screw thread 2 on the external thread piece 1, forms interference fit.
Common API buttress thread for this specification, its pitch diameter of thread E7=271.88mm, footpath decrease δ=5.4mm in of the present utility model, the middle footpath Ep=266.48mm of external screw thread 2 then, get the middle footpath Eb=266.18mm of internal thread 8, the dangerouse cross-section area A p of the dangerouse cross-section area A b of box cupling 5 and external thread piece 1 about equally at this moment.Evidence, this joint bonding strength reaches more than 85% of body intensity, more than the hermetic seal ability 39Mpa, more than the internal pressure strength 53Mpa.
Embodiment two, and second embodiment of the design is the sleeve pipe that is used for Φ 177.8 * 10.36mm, and grade of steel is P110.The external diameter W=185mm of box cupling 5 (the external diameter W of common box cupling
1=194.46mm, the external diameter of the narrow gap of API box cupling is 187.33mm).On external screw element 1, be processed with external screw thread 2, external seal face 3 and outside torque shoulder 4, on box cupling 5, be processed with internal thread 8, inner sealing surface 6 and internal torque shoulder 7; Inner sealing surface 6 on the box cupling 5 closely contacts with external seal face 3 on the external thread piece 1, internal torque shoulder 7 on the box cupling 5 closely contacts with outer torque shoulder 4 on the external thread piece 1, internal thread 8 on the box cupling 5 closely contacts with external screw thread 2 on the external thread piece 1, forms interference fit.
Common API buttress thread for this specification, its pitch diameter of thread E7=176.63mm, footpath decrease δ=3.8mm in of the present utility model, the middle footpath Ep=172.83mm of external screw thread 2 then, get the middle footpath Eb=172.53mm of internal thread 8, the dangerouse cross-section area A p of the dangerouse cross-section area A b of box cupling 5 and external thread piece 1 about equally at this moment.Evidence, this joint bonding strength reaches more than 88% of body intensity, more than the hermetic seal ability 61.8Mpa, more than the internal pressure strength 77.4Mpa.
Claims (2)
1. petroleum sleeve joint that is applicable to the well cementation of narrow gap, be that a kind of tapering is 1: 16 a taper pipe thread joint, form by external thread piece (1) and stubborn the connecing of box cupling (5) two parts, it is characterized in that: on external screw element (1), be processed with external screw thread (2), external seal face (3) and outside torque shoulder (4), on box cupling (5), be processed with internal thread (8), inner sealing surface (6) and internal torque shoulder (7); Inner sealing surface (6) on the box cupling (5) closely contacts with external seal face (3) on the external thread piece (1), internal torque shoulder (7) on the box cupling (5) closely contacts with outer torque shoulder (4) on the external thread piece (1), internal thread (8) on the box cupling (5) closely contacts with external screw thread (2) on the external thread piece (1), forms interference fit.
2. petroleum sleeve joint as claimed in claim 1 is characterized in that: the middle footpath of described external screw thread (2) is Ep; The middle footpath of described internal thread (8) is Eb; Ep-Eb=(0.15～0.35) mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202539907U CN201723171U (en) | 2010-07-09 | 2010-07-09 | Oil casing connector for narrow-gap well cementation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202539907U CN201723171U (en) | 2010-07-09 | 2010-07-09 | Oil casing connector for narrow-gap well cementation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201723171U true CN201723171U (en) | 2011-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202539907U Expired - Lifetime CN201723171U (en) | 2010-07-09 | 2010-07-09 | Oil casing connector for narrow-gap well cementation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201723171U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251748A (en) * | 2011-05-19 | 2011-11-23 | 地质矿产部无锡钻探工具厂 | Rope drill rod thread-connecting structure |
-
2010
- 2010-07-09 CN CN2010202539907U patent/CN201723171U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251748A (en) * | 2011-05-19 | 2011-11-23 | 地质矿产部无锡钻探工具厂 | Rope drill rod thread-connecting structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140922 Granted publication date: 20110126 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20110126 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110126 |
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| CX01 | Expiry of patent term |