CN215520793U - Joint structure for titanium alloy oil pipe - Google Patents
Joint structure for titanium alloy oil pipe Download PDFInfo
- Publication number
- CN215520793U CN215520793U CN202120560212.0U CN202120560212U CN215520793U CN 215520793 U CN215520793 U CN 215520793U CN 202120560212 U CN202120560212 U CN 202120560212U CN 215520793 U CN215520793 U CN 215520793U
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- China
- Prior art keywords
- female end
- sealing surface
- titanium alloy
- oil pipe
- alloy oil
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 104
- 238000013461 design Methods 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims 2
- 238000004026 adhesive bonding Methods 0.000 description 12
- 238000012545 processing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses a joint structure for a titanium alloy oil pipe, which comprises a female end and a male end which are screwed and matched with each other, wherein the female end comprises female end threads, a female end sealing surface and a female end shoulder, the male end comprises male end threads, a male end sealing surface and a male end shoulder, the female end sealing surface adopts an arc structure, the male end sealing surface adopts an inclined surface structure, and the female end sealing surface and the male end sealing surface are in interference fit.
Description
Technical Field
The utility model relates to the technical field of pipeline connection, in particular to a joint structure for a titanium alloy oil pipe.
Background
Along with the gradual development of gas wells in high corrosive environments in China, the corrosion resistance effect of a carbon steel oil pipe can not meet the requirement of higher and higher corrosive environments gradually, and due to the particularity of a titanium alloy material, a connecting joint of the titanium alloy oil pipe is easy to be scratched by a fastening adhesive buckle, so that the sealing effect of the titanium alloy joint is influenced.
Chinese patent number ZL201610810529.9 discloses a special screwed joint structure for titanium alloy oil well pipe, the structural features is that the male end of this structure adopts the cambered surface form, the sealed face of female end adopts the conical surface form, the sealed face of male and female end passes through interference fit and realizes sealing capacity, but this structural style has certain limitation, owing to take place the thread gluing phenomenon easily at the cambered surface of twisting the in-process male end, and then influence its leakproofness, it is very difficult that the male end is restoreed simultaneously, time cost and economic cost have been increased to the repair.
Disclosure of Invention
The technical problem to be solved by the utility model is to overcome the existing defects, and provide a joint structure for a titanium alloy oil pipe, which can effectively improve the sealing capability of the titanium alloy oil pipe, is convenient for the maintenance of the titanium alloy oil pipe, greatly improves the use convenience, and can effectively solve the problems in the background art.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a joint design for titanium alloy oil pipe, includes that the female end and the male end of screwing up the cooperation each other, the sealed face of female end adopts the arc structure, and the sealed face of male end adopts the inclined plane structure, is interference fit between the sealed face of female end and the sealed face of male end, and arc-conical surface sealing interference magnitude depends on the arc radius R of the sealed face of female end.
As a preferred technical solution of the present invention, the range of the arc radius R is:
D*K1/t≤R≤D*K2/t
wherein K1-3.2K 2-4.0
In the formula: d-nominal diameter of the pipe body of the titanium alloy oil pipe and t-nominal wall thickness of the titanium alloy oil pipe.
As a preferred technical scheme of the utility model, the included angle between the inclined plane of the male end sealing surface and the horizontal line is theta, and the angle range of the theta is 7-11 degrees.
As a preferred technical solution of the present invention, the female end includes a female end thread, a female end sealing surface and a female end shoulder, and the male end includes a male end thread, a male end sealing surface and a male end shoulder.
As a preferable technical solution of the present invention, a box end relief groove is formed between the box end thread and the box end sealing surface.
As a preferable technical solution of the present invention, the width of the female end shoulder is greater than the width of the male end shoulder.
As a preferable technical solution of the present invention, the contact pressure between the female end sealing surface and the male end sealing surface is not less than 30% of the yield strength of the pipe body.
Compared with the prior art, the utility model has the beneficial effects that: this a joint design for titanium alloy oil pipe is rational in infrastructure, think about ingeniously, make things convenient for its maintenance when improving titanium alloy oil pipe sealing ability, through setting up the sealed face of box end into the arcwall face, effectual reduction stress concentration, increase the face contact, the anti thread gluing ability of the sealed face of very big promotion titanium alloy oil pipe, and by original 9 times break out and promote more than 10 times and do not take place the thread gluing, the sealed circular arc of general box end can appear the thread gluing phenomenon earlier simultaneously, consequently only need change the box end behind the thread gluing can, needn't adopt the mode that the male end crop continues to process to maintain, greatly reduced time cost and the economic cost who repaiies the thread gluing.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the assembly structure of the present invention;
fig. 3 is an enlarged schematic view at a in fig. 2.
In the figure: 1 female end, 2 female end threads, 3 female end sealing surfaces, 4 female end shoulders, 5 female end tool withdrawal grooves, 6 male ends, 7 male end threads, 8 male end sealing surfaces and 9 male end shoulders.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1-3, the present invention provides a technical solution: a joint structure for a titanium alloy oil pipe comprises a female end 1 and a male end 6 which are mutually screwed and matched, wherein the female end 1 comprises female end threads 2, a female end sealing surface 3 and a female end shoulder 4, the male end 6 comprises male end threads 7, a male end sealing surface 8 and a male end shoulder 9, the width of the female end shoulder 4 is larger than that of the male end shoulder 9, the installation convenience of the female end 1 and the male end 6 is ensured, a female end tool withdrawal groove 5 is processed between the female end threads 2 and the female end sealing surface 3, the arrangement of the female end tool withdrawal groove 5 is convenient for the processing of an arc structure of the female end sealing surface 3, the female end sealing surface 3 adopts an arc structure, the male end sealing surface 8 adopts an inclined surface structure, the female end sealing surface 3 and the male end sealing surface 8 are in interference fit, the inclined surface of the male end sealing surface 8 forms an included angle theta with a horizontal line, the angle of the theta is 8, the sealing surface is limited by the inclined surface angle of the male end sealing surface 8, the sealing surface can further improve the sealing effect with the female end sealing surface 3, the sealing interference magnitude of the arc-conical surface depends on the arc radius R of the sealing surface 3 of the female end, and the range of R is as follows:
D*K1/t≤R≤D*K2/t
wherein K1-3.2K 2-4.0
In the formula: d-nominal diameter of the pipe body of the titanium alloy oil pipe and t-nominal wall thickness of the titanium alloy oil pipe.
If the outer diameter of the titanium alloy oil pipe is 78.4mm and the wall thickness is 5.89mm, the radius R of the female end sealing surface 3 needs to be ensured in the processing range of 42.6-53.2 mm, the included angle theta between the inclined surface of the male end sealing surface 8 and the horizontal line deviates according to the R value, if the R value deviates to the minimum value, the theta is selected to have a larger range, and vice versa.
The contact pressure of the female end sealing surface and the male end sealing surface is 30% of the yield strength of the pipe body, and the air-tight seal detection is carried out on the joint after 10 times of shackling: maintaining the pressure at 90MPa for 10 min, and the leakage rate is lower than 2 multiplied by 10-7mbar.L/s, good sealing performance, and no thread gluing phenomenon on the male end sealing surface 8.
Example 2: a joint structure for a titanium alloy oil pipe comprises a female end 1 and a male end 6 which are mutually screwed and matched, wherein the female end 1 comprises female end threads 2, a female end sealing surface 3 and a female end shoulder 4, the male end 6 comprises male end threads 7, a male end sealing surface 8 and a male end shoulder 9, the width of the female end shoulder 4 is larger than that of the male end shoulder 9, the installation convenience of the female end 1 and the male end 6 is ensured, a female end tool withdrawal groove 5 is processed between the female end threads 2 and the female end sealing surface 3, the arrangement of the female end tool withdrawal groove 5 is convenient for the processing of an arc structure of the female end sealing surface 3, the female end sealing surface 3 adopts the arc structure, the male end sealing surface 8 adopts the inclined surface structure, the female end sealing surface 3 and the male end sealing surface 8 are in interference fit, the inclined surface of the male end sealing surface 8 forms an included angle theta with the horizontal line, the angle of the theta is 10 degrees, and the sealing surface 8 is limited by the inclined surface angle of the male end sealing surface, the inclined surface 3 can further improve the sealing surface sealing effect with the female end 3, the sealing interference magnitude of the arc-conical surface depends on the arc radius R of the sealing surface 3 of the female end, and the range of R is as follows:
D*K1/t≤R≤D*K2/t
wherein K1-3.2K 2-4.0
In the formula: d-nominal diameter of the pipe body of the titanium alloy oil pipe and t-nominal wall thickness of the titanium alloy oil pipe.
If the outer diameter of the titanium alloy oil pipe is 77.6mm and the wall thickness is 5.45mm, the radius R of the female end sealing surface 3 needs to be ensured in the processing range of 45.5-56.9 mm, the included angle theta between the inclined surface of the male end sealing surface 8 and the horizontal line deviates according to the R value, if the R value deviates to the minimum value, the theta is selected to have a larger range, and vice versa.
Female end sealing face andthe contact pressure of the male end sealing surface is 40% of the yield strength of the pipe body, and the air-tight seal detection is carried out on the joint after 10 times of shackling: maintaining the pressure at 90MPa for 10 min, and the leakage rate is lower than 1.86 multiplied by 10-7mbar.L/s, good sealing performance, and no thread gluing phenomenon on the male end sealing surface 8.
Example 3: a joint structure for a titanium alloy oil pipe comprises a female end 1 and a male end 6 which are mutually screwed and matched, wherein the female end 1 comprises female end threads 2, a female end sealing surface 3 and a female end shoulder 4, the male end 6 comprises male end threads 7, a male end sealing surface 8 and a male end shoulder 9, the width of the female end shoulder 4 is larger than that of the male end shoulder 9, the installation convenience of the female end 1 and the male end 6 is ensured, a female end tool withdrawal groove 5 is processed between the female end threads 2 and the female end sealing surface 3, the arrangement of the female end tool withdrawal groove 5 is convenient for the processing of an arc structure of the female end sealing surface 3, the female end sealing surface 3 adopts the arc structure, the male end sealing surface 8 adopts the inclined surface structure, the female end sealing surface 3 and the male end sealing surface 8 are in interference fit, the inclined surface of the male end sealing surface 8 forms an included angle theta with a horizontal line, the angle of the theta is 11 degrees, and the sealing surface 3 can be further improved in sealing effect by limiting the inclined surface angle of the male end sealing surface 8, the sealing interference magnitude of the arc-conical surface depends on the arc radius R of the sealing surface 3 of the female end, and the range of R is as follows:
D*K1/t≤R≤D*K2/t
wherein K1-3.2K 2-4.0
In the formula: d-nominal diameter of the pipe body of the titanium alloy oil pipe and t-nominal wall thickness of the titanium alloy oil pipe.
If the outer diameter of the titanium alloy oil pipe is 78mm and the wall thickness is 5.72mm, the radius R of the female end sealing surface 3 needs to be ensured in the processing range of 43.6-54.5 mm, the included angle theta between the inclined surface of the male end sealing surface 8 and the horizontal line deviates according to the R value, if the R value deviates to the minimum value, the theta is selected to have a larger range, and vice versa.
The contact pressure of the female end sealing surface and the male end sealing surface is 60% of the yield strength of the pipe body, and the air-tight seal detection is carried out on the joint after 10 times of shackling: maintaining the pressure at 90MPa for 10 min, and the leakage rate is lower than 1.98 multiplied by 10-7mbar.L/s, good sealing performance, and no thread gluing phenomenon on the male end sealing surface 8.
Comparative example: by adopting the traditional titanium alloy oil pipe joint structure, the included angle theta between the inclined plane of the male end sealing surface and the horizontal line is 15 degrees, the female end sealing surface is a conventional inclined plane matched with the male end sealing surface, and the male end sealing surface and the female end sealing surface are in interference contact sealing through threads.
The contact pressure of the female end sealing surface and the male end sealing surface is 12% of the yield strength of the pipe body, and the air-tight seal detection is carried out on the joint after 10 times of shackling: maintaining the pressure at 90MPa for 10 min, and the leakage rate is higher than 3.2 multiplied by 10-7mbar.L/s, sealing performance is poor, and the male end sealing surface is obviously subjected to thread gluing phenomenon and is not easy to take down.
It can be concluded from the experiments of examples 1 to 3 and comparative examples that: the utility model can greatly improve the anti-thread gluing capability of the sealing surface of the titanium alloy oil pipe, has good sealing performance after 10 times of thread removing, does not generate thread gluing phenomenon, and increases the use convenience of the titanium alloy oil pipe.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a joint design for titanium alloy oil pipe, is including screwing up complex female end (1) and public end (6) each other, and female end (1) is including female end sealed face (3), and public end (6) are including public end sealed face (8), its characterized in that: the female end sealing surface (3) is of an arc structure, the male end sealing surface (8) is of an inclined surface structure, the female end sealing surface (3) and the male end sealing surface (8) are in interference fit, and the arc-conical surface sealing interference magnitude depends on the arc radius R of the female end sealing surface (3).
2. The joint structure for a titanium alloy oil pipe according to claim 1, wherein: the range of the arc radius R is:
D*K1/t≤R≤D*K2/t
wherein K1-3.2K 2-4.0
In the formula: d-nominal diameter of the pipe body of the titanium alloy oil pipe and t-nominal wall thickness of the titanium alloy oil pipe.
3. The joint structure for a titanium alloy oil pipe according to claim 1, wherein: the included angle between the inclined plane of the male end sealing surface (8) and the horizontal line is theta, and the angle range of theta is 7-11 degrees.
4. The joint structure for a titanium alloy oil pipe according to claim 1, wherein: female end (1) includes female end screw thread (2), female end sealed face (3) and female end circular bead (4), and public end (6) includes public end screw thread (7), public end sealed face (8) and public end circular bead (9).
5. The joint structure for a titanium alloy oil pipe according to claim 4, wherein: a female end tool withdrawal groove (5) is processed between the female end thread (2) and the female end sealing surface (3).
6. The joint structure for a titanium alloy oil pipe according to claim 4, wherein: the width of the female end shoulder (4) is larger than that of the male end shoulder (9).
7. The joint structure for a titanium alloy oil pipe according to claim 4, wherein: the contact pressure between the female end sealing surface (3) and the male end sealing surface (8) is not less than 30% of the yield strength of the pipe body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020115784286 | 2020-12-28 | ||
| CN202011578428 | 2020-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215520793U true CN215520793U (en) | 2022-01-14 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110292752.XA Pending CN112878927A (en) | 2020-12-28 | 2021-03-18 | Joint structure for titanium alloy oil pipe |
| CN202120560212.0U Active CN215520793U (en) | 2020-12-28 | 2021-03-18 | Joint structure for titanium alloy oil pipe |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110292752.XA Pending CN112878927A (en) | 2020-12-28 | 2021-03-18 | Joint structure for titanium alloy oil pipe |
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|---|---|
| CN (2) | CN112878927A (en) |
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2021
- 2021-03-18 CN CN202110292752.XA patent/CN112878927A/en active Pending
- 2021-03-18 CN CN202120560212.0U patent/CN215520793U/en active Active
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|---|---|
| CN112878927A (en) | 2021-06-01 |
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