CN115709159B - Preparation method of high-performance screw thread for oil and gas field - Google Patents
Preparation method of high-performance screw thread for oil and gas field Download PDFInfo
- Publication number
- CN115709159B CN115709159B CN202211534879.9A CN202211534879A CN115709159B CN 115709159 B CN115709159 B CN 115709159B CN 202211534879 A CN202211534879 A CN 202211534879A CN 115709159 B CN115709159 B CN 115709159B
- Authority
- CN
- China
- Prior art keywords
- oil
- threads
- thread
- performance
- gas fields
- 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.)
- Active
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Lubricants (AREA)
Abstract
The invention discloses a preparation method of high-performance threads for oil and gas fields, which comprises the following steps: (1) Processing steel threads, cleaning with alcohol, and drying for later use; (2) Spraying polyurea elastomer on the bottom surface of the tooth at the bottom of the external thread, and standing; (3) After the polyurea elastomer is solidified, coating long-chain polymer glue on the surface of the full thread, spraying solid lubrication particles on the surface of the long-chain polymer glue to form a solid lubrication layer, and standing for 30-35 days; the long-chain polymer glue is prepared by the following steps: adding polyacrylic acid and catechol into deionized water, adding boric acid solution, regulating pH to 9.0 with NaOH solution under nitrogen protection, and mechanically stirring. Compared with special threads, the preparation method of the threads provided by the invention has the advantages of reduced cost and good anti-galling performance and sealing performance.
Description
Technical Field
The invention belongs to the technical field of thread processing, and particularly relates to a preparation method of high-performance threads for oil and gas fields.
Background
In the oil and gas industry, oil casings are mainly different in thread forms, and low-cost high-performance threads are always real demands of various large oil fields. At present, the thread types selected for the domestic and foreign oil and gas fields are of two types: one type is API threads, i.e., threads manufactured according to American Petroleum Institute (API) standards; however, the API thread has poor sealing performance and is easy to be stuck, and often cannot meet the development requirements of gas wells. One type is a special thread, which performs well but at a high cost. In petroleum industry, special threads are generally sealed by metal elastic, the thread structure is complex, the yield is low, and the cost is at least 150% of that of common round threads. The special thread features and cost are well combed by Feng Jie of China Petroleum university (Huadong) and the like. The structure of the traditional airtight special threaded joint mainly comprises three parts, namely a shoulder, a sealing surface and threads. The thread profile is mainly improved by a conventional Buttress (BC) thread profile, and corresponding shoulders and sealing surfaces are added. Since the thread form must have a sufficient full thread length to ensure the tensile and bending resistance of the thread, the thickness of the end wall of the pipe body of the externally threaded joint is greater than the nominal wall thickness of the pipe body for the tapered thread. The sealing structure mainly adopts a sealing form between metals, and is commonly a sealing form between a spherical surface and a conical surface, a sealing form between a conical surface and a conical surface, a sealing form between a spherical surface and a cylindrical surface or a sealing form combining two kinds of sealing. The sealing structure determines that the ovality of the sealing surface has a great influence on the sealing, so that the pipe body needs to be processed with small ovality and high requirements. The above analysis shows the following significant drawbacks: 1) The geometric dimension of the pipe body and the machining quality of the screw thread are required to be high; 2) The processing technology process and the used consumable material are obviously increased, and the processing efficiency is obviously reduced. Practice and investigation of pipe processing enterprises show that the processing time of the special threaded joint coupling is between 30 and 40 minutes, the external thread is between 5 and 8 minutes, and the external thread is 5 to 8 times of the API circular thread. In summary, conventional API round threads are the simplest and economical form of joint in the current oil casing market.
Therefore, how to develop a high-performance thread without increasing the cost is particularly important, so that the use cost of the oil casing can be reduced on the premise of ensuring the safety of the pipe column, and convenience is brought to the development of an oil field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of high-performance threads for oil and gas fields, which utilizes a coating technology to improve the sealing performance and the standing buckle resistance of steel threads.
A preparation method of high-performance threads for oil and gas fields comprises the following steps:
(1) Processing steel threads, cleaning with alcohol, and drying for later use;
(2) Spraying polyurea elastomer on the bottom surface of the tooth at the bottom of the external thread, and standing;
(3) After the polyurea elastomer is solidified, coating long-chain polymer glue on the surface of the full thread, spraying solid lubrication particles on the surface of the long-chain polymer glue to form a solid lubrication layer, and standing for 30-35 days;
the long-chain polymer glue is prepared by the following steps: adding polyacrylic acid and catechol into deionized water, adding boric acid solution, regulating pH to 9.0 with NaOH solution under nitrogen protection, and mechanically stirring.
Preferably, the ratio of polyacrylic acid, catechol, deionized water is 1g:1g: (5-8) mL; the molar ratio of catechol to boric acid is (2-4): 1.
preferably, the concentration of the boric acid solution is 0.5-1mol/L.
Preferably, the spray thickness of the spray polyurea elastomer is from 100 to 1500 μm.
Preferably, the coating thickness of the long-chain polymer glue is 5-20 μm.
Preferably, the spray thickness of the sprayed solid lubricating particles is 100-500 μm.
Preferably, the solid lubricating particles are any one of polytetrafluoroethylene, graphene and molybdenum disulfide.
Preferably, the particle size of the solid lubricating particles is 1-10nm.
Preferably, the steel thread is an API thread machined according to API 5B standard.
The invention has the advantages that:
compared with special threads, the preparation method of the threads provided by the invention has the advantages of reduced cost and good anti-galling performance and sealing performance.
Drawings
The profile of the thread of example 1 of fig. 1 after 5 make-ups;
fig. 2 morphology after 3 make-ups of the thread of comparative example 1;
figure 3 morphology after 5 make-ups of the thread of comparative example 2.
Detailed Description
The oil pipes processed by the embodiment and the comparative example are N80-grade steel oil pipes.
Example 1
A preparation method of high-performance threads for oil and gas fields comprises the following steps:
(1) Processing API round threads according to an API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying 500 mu m-thick PUA-500 polyurea elastomer on the bottom surface of the external thread bottom tooth, and standing;
(3) After the polyurea elastomer is solidified, coating long-chain polymer glue with the thickness of 10 mu m on the surface of the full thread, then spraying polytetrafluoroethylene particles with the thickness of 300 mu m on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 30 days;
the long-chain polymer glue is prepared by the following steps: according to 1g:1g:5mL, adding polyacrylic acid and catechol into deionized water, and then adding 0.5mol/L boric acid solution, wherein the mol ratio of the catechol to the boric acid is 2:1, adjusting the pH to 9.0 by using a 1mol/L NaOH solution under the protection of nitrogen, and mechanically stirring.
Example 2
A preparation method of high-performance threads for oil and gas fields comprises the following steps:
(1) Processing API buttress threads according to an API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying a PUA-500 polyurea elastomer with the thickness of 200 mu m on the bottom surface of the tooth at the bottom of the external thread, and standing;
(3) After the polyurea elastomer is solidified, coating long-chain polymer glue with the thickness of 15 mu m on the surface of the full thread, then spraying graphene particles with the thickness of 500 mu m on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 30 days;
the long-chain polymer glue is prepared by the following steps: according to 1g:1g:5mL, adding polyacrylic acid and catechol into deionized water, and then adding 0.5mol/L boric acid solution, wherein the mol ratio of the catechol to the boric acid is 2:1, adjusting the pH to 9.0 by using a 1mol/L NaOH solution under the protection of nitrogen, and mechanically stirring.
Example 3
A preparation method of high-performance threads for oil and gas fields comprises the following steps:
(1) Processing API round threads according to an API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying a PUA-500 polyurea elastomer with the thickness of 100 mu m on the bottom surface of the tooth at the bottom of the external thread, and standing;
(3) After the polyurea elastomer is solidified, coating long-chain polymer glue with the thickness of 5 mu m on the surface of the full thread, then spraying molybdenum disulfide particles with the thickness of 200 mu m on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 30 days;
the long-chain polymer glue is prepared by the following steps: according to 1g:1g:8mL, adding polyacrylic acid and catechol into deionized water, and then adding 1mol/L boric acid solution, wherein the mol ratio of the catechol to the boric acid is 4:1, adjusting the pH to 9.0 by using a 1mol/L NaOH solution under the protection of nitrogen, and mechanically stirring.
Example 4
A preparation method of high-performance threads for oil and gas fields comprises the following steps:
(1) Processing API buttress threads according to an API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying a PUA-500 polyurea elastomer with the thickness of 1500 mu m on the bottom surface of the tooth at the bottom of the external thread, and standing;
(3) After the polyurea elastomer is solidified, coating long-chain polymer glue with the thickness of 20 mu m on the surface of the full thread, then spraying polytetrafluoroethylene with the thickness of 100 mu m on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 35 days;
the long-chain polymer glue is prepared by the following steps: according to 1g:1g:5mL, adding polyacrylic acid and catechol into deionized water, and then adding 0.5mol/L boric acid solution, wherein the mol ratio of the catechol to the boric acid is 2:1, adjusting the pH to 9.0 by using a 1mol/L NaOH solution under the protection of nitrogen, and mechanically stirring.
Comparative example 1
The prior preparation method of the high-performance screw thread for the oil-gas field comprises the following steps:
(1) Processing API round threads according to an API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying 500 mu m-thick PUA-500 polyurea elastomer on the bottom surface of the external thread bottom tooth, and standing;
(3) After the polyurea elastomer is solidified, E44 epoxy glue with the thickness of 10 mu m is coated on the surface of the full thread, polytetrafluoroethylene particles with the thickness of 300 mu m are sprayed on the surface of the epoxy glue to form a solid lubricating layer, and the solid lubricating layer is stood for 30 days.
Comparative example 2
And processing the API round threads of the uncoated oil pipe according to the API 5B standard.
1. Anti-sticking performance detection
The threads prepared in example 1, comparative example 1 and comparative example 2 were subjected to make-up and break-out tests according to the maximum torque 2427. 2427N.m (1.25 times of the API recommended torque) in the oil well pipe full-size test method oil, casing thread make-up test of the petroleum industry standard SY/T6238.2. The thread profiles of the thread make-up and break-out of example 1, the thread make-up and break-out of comparative example 1, 3 times, and the thread make-up and break-out of comparative example 2, 5 times, are shown in fig. 1 to 3, respectively. And the threads of comparative example 1 are shown in fig. 1 and 2, respectively. From this, the high-performance thread prepared in example 1 has good anti-sticking performance, the coating of comparative example 1 is obviously peeled off, and the coating of comparative example 2 has obvious sticking performance.
2. Sealing performance detection
The screw thread prepared in the example 1 is subjected to a sealing experiment according to SY/T6128-2012 (evaluation test method for the properties of threaded joints of casing and oil pipes), leakage does not occur until the screw thread is pressurized to 92.6MPa, the screw thread prepared in the comparative example 1 is pressurized to 75.2MPa, leakage occurs, and the internal pressure resistance strength of the N80 oil pipe prepared according to the API standard is required to be greater than 72.88 MPa. Whereas the threads of comparative example 2 do not have a seal.
3. Cost calculation
By adopting the technical scheme of the invention, the thread performance cost is improved to about 110% of that of the uncoated thread by using the coating technology only on the basis of the API round thread, so that the invention has the advantage of low cost compared with a special thread.
Claims (8)
1. A preparation method of high-performance threads for oil and gas fields is characterized by comprising the following steps: the method comprises the following steps:
(1) Processing steel threads, cleaning with alcohol, and drying for later use;
(2) Spraying polyurea elastomer on the bottom surface of the tooth at the bottom of the external thread, and standing;
(3) After the polyurea elastomer is solidified, coating long-chain polymer glue on the surface of the full thread, spraying solid lubrication particles on the surface of the long-chain polymer glue to form a solid lubrication layer, and standing for 30-35 days;
the long-chain polymer glue is prepared by the following steps: adding polyacrylic acid and catechol into deionized water, then adding boric acid solution, adjusting the pH to 9.0 with NaOH solution under the protection of nitrogen, and mechanically stirring;
the ratio of polyacrylic acid, catechol and deionized water is 1g:1g: (5-8) mL; the molar ratio of catechol to boric acid is (2-4): 1.
2. the method for producing high-performance threads for oil and gas fields according to claim 1, wherein: the concentration of the boric acid solution is 0.5-1mol/L.
3. The method for producing high-performance threads for oil and gas fields according to claim 2, wherein: the spraying thickness of the spraying polyurea elastomer is 100-1500 mu m.
4. A method of preparing high performance threads for oil and gas fields according to claim 3, characterized in that: the coating thickness of the long-chain polymer glue is 5-20 mu m.
5. The method for producing high-performance threads for oil and gas fields according to claim 4, wherein: the spraying thickness of the sprayed solid lubricating particles is 100-500 mu m.
6. The method for preparing high-performance threads for oil and gas fields according to claim 5, wherein the method comprises the following steps: the solid lubricating particles are any one of polytetrafluoroethylene, graphene and molybdenum disulfide.
7. The method for producing high-performance threads for oil and gas fields according to claim 6, wherein: the particle size of the solid lubricating particles is 1-10nm.
8. The method for producing high-performance threads for oil and gas fields according to claim 1, wherein: the steel thread is an API thread processed according to the API 5B standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211534879.9A CN115709159B (en) | 2022-12-02 | 2022-12-02 | Preparation method of high-performance screw thread for oil and gas field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211534879.9A CN115709159B (en) | 2022-12-02 | 2022-12-02 | Preparation method of high-performance screw thread for oil and gas field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115709159A CN115709159A (en) | 2023-02-24 |
| CN115709159B true CN115709159B (en) | 2023-09-29 |
Family
ID=85235927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211534879.9A Active CN115709159B (en) | 2022-12-02 | 2022-12-02 | Preparation method of high-performance screw thread for oil and gas field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115709159B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101103221A (en) * | 2005-01-13 | 2008-01-09 | 住友金属工业株式会社 | Threaded joints for steel pipes |
| CN105221081A (en) * | 2015-10-30 | 2016-01-06 | 陕西延长石油(集团)有限责任公司研究院 | A kind of elastic packing helicitic texture |
| CN106269446A (en) * | 2016-10-07 | 2017-01-04 | 柳州欧维姆机械股份有限公司 | High anticorrosion major diameter high-strength screw-thread steel rod and preparation method thereof |
| JP2018003995A (en) * | 2016-07-05 | 2018-01-11 | 櫻護謨株式会社 | Hose manufacturing method, hose manufacturing device and hose |
| CN111518462A (en) * | 2020-05-28 | 2020-08-11 | 胜利油田新大管业科技发展有限责任公司 | Anticorrosive spray polyurea elastomer and preparation method and application thereof |
| CN113061834A (en) * | 2021-03-18 | 2021-07-02 | 上海海隆石油管材研究所 | Anti-friction lubricating treatment process for drill tool joint threads |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050176592A1 (en) * | 2004-02-11 | 2005-08-11 | Tenaris Ag | Method of using intrinsically conductive polymers with inherent lubricating properties, and a composition having an intrinsically conductive polymer, for protecting metal surfaces from galling and corrosion |
-
2022
- 2022-12-02 CN CN202211534879.9A patent/CN115709159B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101103221A (en) * | 2005-01-13 | 2008-01-09 | 住友金属工业株式会社 | Threaded joints for steel pipes |
| CN105221081A (en) * | 2015-10-30 | 2016-01-06 | 陕西延长石油(集团)有限责任公司研究院 | A kind of elastic packing helicitic texture |
| JP2018003995A (en) * | 2016-07-05 | 2018-01-11 | 櫻護謨株式会社 | Hose manufacturing method, hose manufacturing device and hose |
| CN106269446A (en) * | 2016-10-07 | 2017-01-04 | 柳州欧维姆机械股份有限公司 | High anticorrosion major diameter high-strength screw-thread steel rod and preparation method thereof |
| CN111518462A (en) * | 2020-05-28 | 2020-08-11 | 胜利油田新大管业科技发展有限责任公司 | Anticorrosive spray polyurea elastomer and preparation method and application thereof |
| CN113061834A (en) * | 2021-03-18 | 2021-07-02 | 上海海隆石油管材研究所 | Anti-friction lubricating treatment process for drill tool joint threads |
Non-Patent Citations (1)
| Title |
|---|
| 贻贝仿生自愈合pH敏感性聚丙烯酸凝胶的制备;金晶等;《高分子材料科学与工程》;第35卷(第11期);第169-173页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115709159A (en) | 2023-02-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105672904B (en) | A kind of direct linkage type hermetic seal casing for high temperature and pressure ultradeep well | |
| CN108798550A (en) | A kind of titanium alloy oil pipe anti-galling air-tight seal screw joint | |
| CN115709159B (en) | Preparation method of high-performance screw thread for oil and gas field | |
| US6957834B2 (en) | Threaded joint for pipes | |
| CN202689965U (en) | Air-tight seal oil pipe threaded joint applied to high-temperature and high-pressure gas well | |
| RU160886U1 (en) | HIGH-SEALED THREADED JOINT OF ELECTRIC WELDED CASING OIL PIPES | |
| CN203925326U (en) | The antitorque high pressure sealing drilling rod joint of height for oil gas drilling | |
| CN212454282U (en) | Novel sucker rod | |
| CN202081837U (en) | Stress-resistant threaded connector with corrosive gas sealing sleeve | |
| CN201874485U (en) | Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads | |
| JP2017072187A (en) | Screw joint for oil well pipe casing | |
| CN112554810A (en) | High-strength corrosion-resistant aluminum alloy special threaded oil well pipe | |
| CN218117710U (en) | High-performance threaded joint for quick connecting sleeve | |
| CN207499814U (en) | A kind of antitorque connector of dual stage shoulder | |
| CN203175411U (en) | External upset welding-line-less drill rod | |
| CN212454283U (en) | Novel sucker rod | |
| CN212317884U (en) | Semi-coating repaired full-coating sucker rod | |
| CN212508129U (en) | Air-tight screw-connected pipe joint | |
| CN208918802U (en) | Corrosion-resistant wear-resistant oil pump | |
| CN116144293B (en) | Preparation method of long-chain polymer glue and application of long-chain polymer glue in oil and gas fields | |
| CN201778673U (en) | Threaded pipe with molybdenum disulfide plating layer | |
| CN202176275U (en) | API (American Petroleum Institute) petroleum sleeve threaded connecting structure for preventing flow field induced corrosion and improving sealing property | |
| CN2764922Y (en) | Double shoulder metal hermetic sealing drill pipe joint | |
| JPS61136087A (en) | Pipe joint for oil well pipe | |
| CN114439384B (en) | Casing pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |