CN204266943U - A kind of erosion-resisting low stress body air-tight seal connecting structure - Google Patents
A kind of erosion-resisting low stress body air-tight seal connecting structure Download PDFInfo
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- CN204266943U CN204266943U CN201420708775.XU CN201420708775U CN204266943U CN 204266943 U CN204266943 U CN 204266943U CN 201420708775 U CN201420708775 U CN 201420708775U CN 204266943 U CN204266943 U CN 204266943U
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Abstract
A kind of erosion-resisting low stress body air-tight seal connecting structure, low stress hermetically-sealed construction is provided with between body connects externally threaded top to be connected internal thread bottom with box cupling, described low stress hermetically-sealed construction is made up of male cone (strobilus masculinus) seal section, arc surface seal section and inner conical surface seal section, the cone angle of male cone (strobilus masculinus) seal section is 5 ° ~ 30 °, and matching allowance is 0.05 ~ 0.20 millimeter; The matching allowance of arc surface seal section is 0.10 ~ 0.25 millimeter; The face angle of inner conical surface seal section is 5 ° ~ 15 °, and matching allowance is 0.03 ~ 0.1 millimeter.Share owing to changing the close stress of sealing between body and box cupling into three faces by one side distribution, the power that scoops out of everywhere seal section is reduced, so both ensure that both connection sealing energy, again reduce the stress at the place that is tightly connected, under the prerequisite ensureing connection sealing energy, H can be reduced
2s double thread be tightly connected place corrosion, overcome the technological deficiency existed in existing technology.
Description
Technical field
The utility model relates to a kind of low stress hermetic seal casing threaded connection structure, relates to oil, natural gas probing casing threaded connection structure technical field, and mainly in industrial gas oil, oil gas field uses, and is applied to H
2the Oil/gas Well that under S etching condition, hermetic seal is stable.
Background technology
Steel Casing and oil pipe must be used in oil, natural gas drilling process, at present, oil recovery passage is casing string and tubing string composition, tubing string is arranged in casing string, casing string to be tightly connected between two by box cupling by some sleeve pipes and to form, tubing string to be tightly connected between two by box cupling by some oil pipes and to form, and casing string puts into the well be drilled to, and ruins for preventing formation fluids and stratum from squeezing.Tubing string stretches into formation crude oil or natural gas in casing string and leads to the acquisition channel on ground.Natural gas in natural gas extraction gas well all contains H usually
2s, CO
2deng corrosive medium, and H
2s gas has certain corrosiveness for the connecting portion of tubing string and casing string, and the stress intensity of extent of corrosion and junction has direct relation, and according to achievement in research, junction stress is larger, more easily by H
2s gas attack, therefore, in order to alleviate H
2the corrosion of S gas, the connection stress between body and box cupling is the smaller the better.But the sealing of junction and the proportional relation of contact stress, namely the larger sealing of contact stress is better.End face seal between existing body and box cupling is one side interference structure, meet sealing performance requirement, and contact stress between the two just must reach predetermined value; How solving this to contradiction is the technical barrier that those skilled in the art are difficult to overcome.
Utility model content
The purpose of this utility model is a kind of erosion-resisting low stress body air-tight seal connecting structure, sealing contact stress, by triple seal section combination sealing, is shared on three seal sections, is reduced the contact stress of each seal section by it, the sealing performance connected can be ensured like this, can H be reduced again
2s is to the corrosion of junction.
The technical scheme that the utility model is taked is as follows:
A kind of erosion-resisting low stress body air-tight seal connecting structure, comprise body and box cupling, connection external screw thread is provided with at the link of body, the two ends of box cupling are provided with connection internal thread, linked into an integrated entity by external screw thread and screwing of internal thread between body and box cupling, it is characterized in that: connecting externally threaded top and between the bottom being connected internal thread, be provided with low stress hermetically-sealed construction, described low stress hermetically-sealed construction is by male cone (strobilus masculinus) seal section, triple interference low stress Hermetical connecting structures of arc surface seal section and inner conical surface seal section composition, the cone angle of male cone (strobilus masculinus) seal section is 5 ° ~ 30 °, matching allowance is 0.05 ~ 0.25 millimeter, the matching allowance of arc surface seal section is 0.05 ~ 0.35 millimeter, the face angle of inner conical surface seal section is 5 ° ~ 15 °, and matching allowance is 0.03 ~ 0.1 millimeter.
Further, the cone angle of male cone (strobilus masculinus) seal section is 10 ° ~ 15 °, and matching allowance is 0.10 ~ 0.20 millimeter; The matching allowance of arc surface seal section is 0.10 ~ 0.20 millimeter; The face angle of inner conical surface seal section is 8 ° ~ 10 °, and matching allowance is 0.05 ~ 0.08 millimeter.
Further, the cone angle of male cone (strobilus masculinus) seal section is 15 °, and matching allowance is 0.15 millimeter; The matching allowance of arc surface seal section is 0.15 millimeter; The face angle of inner conical surface seal section is 9 °, and matching allowance is 0.06 millimeter.
Further, the axial interference fit seal length of male cone (strobilus masculinus) seal section is 5 ~ 25 millimeters; The contact width of inner conical surface seal section is 3 ~ 5 millimeters; The cornerite of arc surface seal section is 60 ° ~ 90 °.
Cloth is divided owing to changing the close stress of sealing between body and box cupling into three punishment by existing single-point integrated distribution, the power that scoops out of everywhere seal section is reduced, so both ensure that the reliability connecting sealing between body and box cupling, again reduce the stress at the place that is tightly connected, thus under the prerequisite ensureing connection sealing energy, H can be reduced
2s, to the corrosion at the place that is tightly connected between body and box cupling, overcomes the technological deficiency existed in existing technology.
Accompanying drawing illustrates:
Fig. 1 is the schematic diagram of the screw connection structure between body and box cupling;
Fig. 2 is the schematic diagram (before spinning) of body and box cupling connecting thread end face seal syndeton;
Fig. 3 is the schematic diagram (after spinning) of body and box cupling connecting thread end face seal syndeton;
In figure: 1-body; 2-box cupling; 3-male cone (strobilus masculinus) seal section; 4-arc surface seal section; 5-inner conical surface seal section; 31-body male cone (strobilus masculinus) seal section; 32-box cupling male cone (strobilus masculinus) seal section; 41-body arc surface seal section; 42-box cupling arc surface seal section; 51-body inner conical surface seal section; 52-box cupling inner conical surface seal section; α is the frustoconical bevel angle of male cone (strobilus masculinus) seal section; β is the frustoconical bevel angle of inner conical surface seal section.
Detailed description of the invention
Detailed description of the invention of the present utility model is illustrated below in conjunction with accompanying drawing:
Embodiment 1:
A kind of erosion-resisting low stress body air-tight seal connecting structure, comprise body 1 and box cupling 2, connection external screw thread is provided with at the link of body 1, the two ends of box cupling 2 are provided with connection internal thread, linked into an integrated entity by external screw thread and screwing of internal thread between body 1 and box cupling 2, connecting externally threaded top and between the bottom being connected internal thread, be provided with low stress hermetically-sealed construction, described low stress hermetically-sealed construction is by male cone (strobilus masculinus) seal section 3, triple interference low stress Hermetical connecting structures that arc surface seal section 4 and inner conical surface seal section 5 form, male cone (strobilus masculinus) seal section 3 is formed by the interference fit of body male cone (strobilus masculinus) seal section 31 and box cupling male cone (strobilus masculinus) seal section 32, the cooperation cone angle of male cone (strobilus masculinus) seal section 3 is 15 °, matching allowance is 0.15 millimeter, arc surface seal section 4 is formed by body arc surface seal section 41 and box cupling arc surface seal section 42 interference fit, and matching allowance is 0.20 millimeter, and the cornerite of arc surface seal section 4 is 65 °, inner conical surface seal section 5 is formed by body inner conical surface seal section 51 and box cupling inner conical surface seal section 52 interference fit, and the cooperation face angle β of inner conical surface seal section 5 is 9 °, and matching allowance is 0.06 millimeter.
Claims (4)
1. an erosion-resisting low stress body air-tight seal connecting structure, comprise body (1) and box cupling (2), connection external screw thread is provided with at the link of body (1), the two ends of box cupling (2) are provided with connection internal thread, linked into an integrated entity by external screw thread and screwing of internal thread between body (1) and box cupling (2), it is characterized in that: connecting externally threaded top and between the bottom being connected internal thread, be provided with low stress hermetically-sealed construction, described low stress hermetically-sealed construction is by male cone (strobilus masculinus) seal section (3), triple interference low stress Hermetical connecting structures that arc surface seal section (4) and inner conical surface seal section (5) form, the cone angle of male cone (strobilus masculinus) seal section (3) is 5 ° ~ 30 °, matching allowance is 0.05 ~ 0.25 millimeter, the matching allowance of arc surface seal section (4) is 0.05 ~ 0.35 millimeter, the face angle of inner conical surface seal section (5) is 5 ° ~ 15 °, and matching allowance is 0.03 ~ 0.1 millimeter.
2. erosion-resisting low stress body air-tight seal connecting structure according to claim 1, is characterized in that: the cone angle of male cone (strobilus masculinus) seal section (3) is 10 ° ~ 15 °, and matching allowance is 0.10 ~ 0.20 millimeter; The matching allowance of arc surface seal section (4) is 0.10 ~ 0.20 millimeter; The face angle of inner conical surface seal section (5) is 8 ° ~ 10 °, and matching allowance is 0.05 ~ 0.08 millimeter.
3. erosion-resisting low stress body air-tight seal connecting structure according to claim 2, is characterized in that: the cone angle of male cone (strobilus masculinus) seal section (3) is 15 °, and matching allowance is 0.15 millimeter; The matching allowance of arc surface seal section (4) is 0.15 millimeter; The face angle of inner conical surface seal section (5) is 9 °, and matching allowance is 0.06 millimeter.
4. erosion-resisting low stress body air-tight seal connecting structure according to claim 1, is characterized in that: the axial interference fit seal length of male cone (strobilus masculinus) seal section (3) is 5 ~ 25 millimeters; The contact width of inner conical surface seal section (5) is 3 ~ 5 millimeters; The cornerite of arc surface seal section (4) is 60 ° ~ 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420708775.XU CN204266943U (en) | 2014-11-21 | 2014-11-21 | A kind of erosion-resisting low stress body air-tight seal connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420708775.XU CN204266943U (en) | 2014-11-21 | 2014-11-21 | A kind of erosion-resisting low stress body air-tight seal connecting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204266943U true CN204266943U (en) | 2015-04-15 |
Family
ID=52801815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420708775.XU Active CN204266943U (en) | 2014-11-21 | 2014-11-21 | A kind of erosion-resisting low stress body air-tight seal connecting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204266943U (en) |
-
2014
- 2014-11-21 CN CN201420708775.XU patent/CN204266943U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |