CN201778676U - Low pressure-resistant air-tight seal sleeve joint - Google Patents
Low pressure-resistant air-tight seal sleeve joint Download PDFInfo
- Publication number
- CN201778676U CN201778676U CN2010202822065U CN201020282206U CN201778676U CN 201778676 U CN201778676 U CN 201778676U CN 2010202822065 U CN2010202822065 U CN 2010202822065U CN 201020282206 U CN201020282206 U CN 201020282206U CN 201778676 U CN201778676 U CN 201778676U
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- China
- Prior art keywords
- screw thread
- low pressure
- pressure gas
- joint
- thread
- 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.)
- Expired - Lifetime
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 18
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 239000008186 active pharmaceutical agent Substances 0.000 description 5
- 239000003550 marker Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses a low pressure-resistant air-tight seal sleeve joint, which comprises a coupling and a casing head, wherein the coupling is provided with internal threads; the casing head is provided external threads; and the internal threads and the external threads have the same tooth shape and are in interference mesh. Different from the traditional sleeve joint adopting a metal-to-metal sealing surface, the low pressure-resistant air-tight seal sleeve joint is sealed by thread engagement, the sealing performance of the sleeve joint can be ensured, meanwhile, the production cost of the sleeve joint is greatly reduced, thereby having very strong economic competitiveness.
Description
Technical field
The utility model relates to a kind of casing joint, relates in particular to a kind of anti-hypobaric Sealed casing pipe joint.
Background technology
Along with going deep into of oil-gas mining, some low-pressure gas wells are more and more to be used by exploitation.The common API LC joint that is applicable to gas well does not have permanent stable gas sealing ability, and the joint bonding strength is lower than body; And API BC button does not have the hermetic seal function.Therefore now in low-pressure gas well, employing be special snapping head, the hermetic seal of special snapping head and stretch-proof performance are better, but working service cost height is used in the low-pressure gas well and wastes one's talent on a petty job.The performance characteristics of existing API joint and the special snapping head of high pressure resistant hermetic seal is as shown in table 1.
Table 1
From above-mentioned table 1 as can be seen, though conventional API joint has good versatility, it can not guarantee permanent sealing, though and special snapping head have a good performance, its cost is but too high.
Publication number is CN2248815, open day is on March 5th, 1997, the Chinese patent literature that name is called " petroleum casing pipe thread seal joint " discloses a kind of thread seal joint that is applicable to the sleeve pipe connection of high-pressure gas well, deep-well, its primary seal partly is to be formed by body evagination circular portion and box cupling inner conical surface, and dome radius of curvature and interior spacing shoulder stipulated to the corresponding size of seal point, and before and after primary seal, respectively be provided with one section ring screw fat storage chamber.
Publication number is CN2549162, open day is on May 7th, 2003, the Chinese patent literature that name is called " petroleum casing pipe air-tight seal screw joint " discloses a kind of petroleum casing pipe air-tight seal screw joint, be characterized in that the box cupling two-end structure is symmetrical setting, the box thread of each end is to be made of buttress thread, in its place ahead interior sealing cone is arranged, the end of sealing cone is processed with box cupling internal torque shoulder in box cupling, and the screw thread of each end is connected with sealing cone by escape; There is the external seal conical surface in male thread the place ahead of cannula tip, torque shoulder outside its end is processed with, and sealing cone and internal torque shoulder contact with the external seal conical surface and the outer torque shoulder of cannula tip in the box cupling.
Publication number is CN1169518, open day is on January 7th, 1998, the Chinese patent literature that name is called " high-airtight buttress thread casing-pipe connection structure " discloses a kind of casing joint, sleeve pipe two ends wall thickness end face is made arc-shaped curved surface, has axial interference " △ " to make the thick end face of tube connector end wall of two sleeve pipes compress sturdy tube wall mutually after two sleeve pipes connect by box cupling and produces the connection sealing surface that elastic-plastic deformation forms metal to metal.
Publication number is CN2451715, open day is October 3 calendar year 2001, the Chinese patent literature that name is called " the high pressure gas sealed attachment structure of a kind of petroleum casing pipe and oil pipe " discloses a kind of mechanism that is tightly connected, the box cupling that it comprises the sleeve pipe with outer cone buttress thread and has the female cone buttress thread, be provided with joint ring between cannula tip and box cupling, the high contact stress on joint ring and sleeve pipe and the box cupling contact surface has guaranteed the gases at high pressure sealing.The height of the full threaded section crest of sleeve pipe suitably reduces, with reduce and box cupling between contact stress and the circumferential stress in the box cupling, avoid the stress corrosion in acid gas well.
From the introduction of above-mentioned patent documentation as can be seen, it all is the sleeve pipe special joint that relates at high-pressure gas well, joint can bear very big air pressure, its common characteristic is exactly by the design of the sealing surface that increases a metal to metal (cylinder, sphere or the conical surface) with torque shoulder, reach the function of hermetic seal, in these structures, screw thread mainly is to play interconnect function.
Summary of the invention
The purpose of this utility model provides a kind of Sealed casing pipe of anti-low pressure gas joint, and it is applicable to low-pressure gas well, and it does not need the sealing surface of processing metal to metal, but directly by the profile of tooth of design screw thread, the screw thread interference fit reaches the hermetic seal effect.Therefore, the utility model reduces greatly than the cost of production of existing special joint, is a kind of Eco-power Sealed casing pipe joint, has very strong economic competitiveness when guaranteeing sealing.
In order to realize the foregoing invention purpose, the utility model provides a kind of Sealed casing pipe of anti-low pressure gas joint, comprise a box cupling and a casing head, described anti-low pressure is meant the air pressure that can bear smaller or equal to 45MPa, it is characterized in that: described box cupling is provided with internal thread, described casing head is provided with external screw thread, and described internal thread is identical with externally threaded profile of tooth, described internal thread and external screw thread interference engagement.
Preferably, described internal thread and externally threaded profile of tooth are: the addendum line of screw thread, tooth bottom line and middle line are parallel to each other, the tooth depth of screw thread is 1.5～2.0mm, the middle line of screw thread is divided tooth depth equally, screw thread carrying angle α is 0～10 °, screw thread guide angle β is 40 °～60 °, and the bearing surface tooth top radius of screw thread is 0.2～0.8mm, and the spigot surface tooth top radius of screw thread is 0.2～1.5mm.
Preferably, the bearing surface tooth top radius of described screw thread is 0.2～0.4mm.
Preferably, described screw thread carrying angle α is 0～2 °.
Preferably, described screw thread guide angle β is 40 °～50 °.
Preferably, the angle between described middle line and the horizontal axis is 1: 16.
Preferably, the axial length of described internal thread and external screw thread interference engagement is 95～125mm.
Preferably, the internal thread of described box cupling is copper facing internal thread or manganese phosphatization internal thread.
Adopt when detaining in the above-mentioned casing joint, carry out between box cupling and the casing head when hand-tight, box cupling and casing head normal engaged, connect the position above behind the hand-tight position when twisting, the internal thread of box cupling and the external screw thread of casing head are just in spigot surface generation interference fit, again because the carrying angle differences in angle of thread tooth is little, contact area is little, screw thread deforms hardly, and between at the bottom of tooth top and the tooth, kept certain contact stress simultaneously, thereby guarantee that whole joint has higher gas sealing ability, can tolerate the job requirement of low pressure gas well.
The utility model makes its gas sealing ability, stretch-proof requirement and use cost all can satisfy the gas well of low pressure, low yield, the recovery process of oil gas combined shaft by adopting technique scheme:
1. casing joint described in the utility model has the sealing function smaller or equal to yield strength in 45MPa or the body (smaller value between the two);
2. the less design in the carrying angle of profile of tooth and the Design of length of effective thread (screw-threaded engagement) make the tensile strength of casing joint can reach identical with body;
3. the bigger design of the guide angle of profile of tooth, make casing joint can bear on three twice and thread gluing does not take place, if in addition box cupling copper facing or high temperature manganese phosphatization are handled again, in use optimize simultaneously torque wrench moment and set and go up the design of button triangular marker, then can make the anti-stick button of casing joint better.
4. the sealing surface design of metal to metal is not adopted in casing joint described in the utility model, only seals by screw-threaded engagement, can reduce the joint manufacturing cost greatly.
Description of drawings
Come the Sealed casing pipe of anti-low pressure gas joint described in the utility model is described further below in conjunction with the drawings and specific embodiments.
Fig. 1 is the thread tooth schematic diagram of casing joint described in the utility model.
Fig. 2 is the enlarged drawing of the screw thread carrying angle α shown in Fig. 1.
Fig. 3 is a casing joint user mode schematic diagram described in the utility model.
Fig. 4 tightens the using method schematic diagram of control for casing joint described in the utility model by triangular marker.
The specific embodiment
As depicted in figs. 1 and 2, casing joint comprises box cupling 1 and casing head 2, and box cupling is provided with internal thread, and casing head is provided with external screw thread, internal thread and interference engagement identical with externally threaded profile of tooth.The addendum line 3 of screw thread, tooth bottom line and middle line 4 are parallel to each other.The tooth depth of screw thread among each embodiment, screw thread carrying angle α, screw thread guide angle β, internal thread and externally threaded bearing surface tooth top radius R 3 and R4 (R3=R4), and the value of internal thread and externally threaded spigot surface tooth top radius R 2 and R1 (R1=R2) is as shown in table 1.
Sleeve pipe model among each embodiment is Φ 139.7 * 9.17mm P110.
Thread tooth parameter and performance index among table 1. embodiment 1-7 and the Comparative Examples 1-5
From above-mentioned table 1 as can be seen, when tooth depth exceeds value range described in the utility model (Comparative Examples 3), behind Three Up Three Down joint, thread gluing has taken place in this casing joint.
Excessive or guide angle is too small when the carrying angle, when having exceeded scope described in the utility model (Comparative Examples 1 and Comparative Examples 2), the sealing of casing joint reduces greatly.
Too small when spigot surface tooth top radius, when having exceeded scope described in the utility model (Comparative Examples 4), thread gluing has taken place in casing joint.
Excessive when bearing surface tooth top radius, when having exceeded scope described in the utility model (Comparative Examples 5), the joint efficiency of casing joint descends to some extent.
As shown in Figure 3, casing joint in the various embodiments described above and the Comparative Examples is according to cooperating with sleeve pipe as shown in the figure, and e is the male joint end among the figure, and P1 is hand-tight position, P2 is that minimum machine is twisted the position, P3 is that maximum machine is twisted the position, and P is the tight position of actual machine, and 14 is effective thread length, d is the cover external diameter of pipe, t is a casing wall thickness, and wherein distance is 4.8mm between the P1P2, and distance is 6.35mm between the P2P3.P is 4.0-10.35mm.Effective thread length L 4 is between 95-125mm.Box cupling adopts copper facing zinc or high temperature manganese phosphatization to handle, and the male thread of alloy pipe adopts bead.
As shown in Figure 4, casing joint in the various embodiments described above and the Comparative Examples is all adopted moment of torsion to instruct and is gone up the button operation, do triangular marker 6 check positions on the buckle on sleeve pipe 5, the base whether end face of check box cupling 1 covers triangular marker 6 fully wherein triangle base to apex height is 6.35mm.
Should be appreciated that it only is a kind of method that realizes internal thread and external screw thread interference engagement that above-mentioned machine is tightened, not as the restriction to the claimed technical scheme of the utility model.Triangular marker also only is a kind of method that is used to check box cupling axial feed degree in addition, not as the restriction to the claimed technical scheme of the utility model.
In addition, in order to confirm the tensile strength of casing joint described in the utility model, the failure test that the inventor has also carried out pure extension to embodiment two, joint stretch, and tensile load exceeds the specified body failure intensity 21% of API when losing efficacy, and breaks invalid position on body.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.
Claims (8)
1. the Sealed casing pipe of anti-low pressure gas joint, comprise a box cupling and a casing head, described anti-low pressure gas is meant the air pressure that can bear smaller or equal to 45MPa, it is characterized in that: described box cupling is provided with internal thread, described casing head is provided with external screw thread, described internal thread is identical with externally threaded profile of tooth, described internal thread and external screw thread interference engagement.
2. the Sealed casing pipe of anti-low pressure gas joint as claimed in claim 1, it is characterized in that, described internal thread and externally threaded profile of tooth are: the addendum line of screw thread, tooth bottom line and middle line are parallel to each other, the tooth depth of screw thread is 1.5～2.0mm, the middle line of screw thread is divided tooth depth equally, and screw thread carrying angle α is 0～10 °, and screw thread guide angle β is 40 °～60 °, the bearing surface tooth top radius of screw thread is 0.2～0.8mm, and the spigot surface tooth top radius of screw thread is 0.2～1.5mm.
3. the Sealed casing pipe of anti-low pressure gas joint as claimed in claim 2 is characterized in that, the bearing surface tooth top radius of described screw thread is 0.2～0.4mm.
4. the Sealed casing pipe of anti-low pressure gas joint as claimed in claim 3 is characterized in that, described screw thread carrying angle α is 0～2 °.
5. the Sealed casing pipe of anti-low pressure gas joint as claimed in claim 4 is characterized in that, described screw thread guide angle β is 40 °～50 °.
6. as any described Sealed casing pipe of anti-low pressure gas joint in the claim 2～5, it is characterized in that the angle between described middle line and the horizontal axis is 1: 16.
7. the Sealed casing pipe of anti-low pressure gas joint as claimed in claim 6 is characterized in that, the axial length of described internal thread and external screw thread interference engagement is 95～125mm.
8. the Sealed casing pipe of anti-low pressure gas joint as claimed in claim 7 is characterized in that, the internal thread of described box cupling is copper facing internal thread or manganese phosphatization internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202822065U CN201778676U (en) | 2010-08-04 | 2010-08-04 | Low pressure-resistant air-tight seal sleeve joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202822065U CN201778676U (en) | 2010-08-04 | 2010-08-04 | Low pressure-resistant air-tight seal sleeve joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201778676U true CN201778676U (en) | 2011-03-30 |
Family
ID=43791889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202822065U Expired - Lifetime CN201778676U (en) | 2010-08-04 | 2010-08-04 | Low pressure-resistant air-tight seal sleeve joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201778676U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926674A (en) * | 2011-08-11 | 2013-02-13 | 中国石油天然气集团公司 | Low pressure gas seal special screwed joint |
| WO2015089897A1 (en) * | 2013-12-18 | 2015-06-25 | 宝山钢铁股份有限公司 | Airtight casing joint |
| CN113739674A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Inspection gauge for thread tooth width on threaded joint and inspection method thereof |
-
2010
- 2010-08-04 CN CN2010202822065U patent/CN201778676U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926674A (en) * | 2011-08-11 | 2013-02-13 | 中国石油天然气集团公司 | Low pressure gas seal special screwed joint |
| CN102926674B (en) * | 2011-08-11 | 2015-12-02 | 中国石油天然气集团公司 | Low pressure air-sealed special threaded joint |
| WO2015089897A1 (en) * | 2013-12-18 | 2015-06-25 | 宝山钢铁股份有限公司 | Airtight casing joint |
| EA031841B1 (en) * | 2013-12-18 | 2019-02-28 | Баошань Айрон Энд Стил Ко., Лтд. | Airtight casing joint |
| CN113739674A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Inspection gauge for thread tooth width on threaded joint and inspection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110330 |