CN115709159A - Preparation method of high-performance thread for oil and gas fields - Google Patents
Preparation method of high-performance thread for oil and gas fields Download PDFInfo
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- CN115709159A CN115709159A CN202211534879.9A CN202211534879A CN115709159A CN 115709159 A CN115709159 A CN 115709159A CN 202211534879 A CN202211534879 A CN 202211534879A CN 115709159 A CN115709159 A CN 115709159A
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Abstract
The invention discloses a preparation method of a high-performance thread for an oil and gas field, which comprises the following steps: (1) Processing steel threads, cleaning with alcohol, and drying for later use; (2) Spraying a polyurea elastomer on the surface of the bottom tooth bottom of the external thread, and standing; (3) After the polyurea elastomer is cured, coating long-chain polymer glue on the surface of the full thread, then spraying solid lubricating particles on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 30-35 days; the long-chain polymer glue is prepared by the following method: adding polyacrylic acid and catechol into deionized water, then adding boric acid solution, adjusting the pH to 9.0 by using NaOH solution under the protection of nitrogen, and mechanically stirring. Compared with special threads, the preparation method of the threads provided by the invention has the advantages of low cost, and good thread gluing resistance and sealing performance.
Description
Technical Field
The invention belongs to the technical field of thread machining, and particularly relates to a preparation method of a high-performance thread for an oil and gas field.
Background
In the oil and gas industry, the difference of oil casings is mainly the difference of thread forms, and low-cost high-performance threads are always the actual requirements of various large oil fields. At present, the thread forms selected by oil and gas fields at home and abroad are of two types: one type is API threads, i.e., threads made according to the American Petroleum Institute (API) standard; however, the API thread has poor sealing performance and is easy to thread and glue, and the requirement of gas well development cannot be met. One type is a special thread, which performs well but at high cost. In the petroleum industry, special threads are generally sealed by metal elasticity, the thread structure is complex, the success rate is low, and the cost is at least 150% of that of a common round thread. Feng Jie, china university of Petroleum (east China), etc., has the characteristics and cost of special threads combed in detail. The traditional air-tight special screwed joint mainly comprises three parts, namely a shoulder, a sealing surface and a thread. The thread profile of the thread is mainly improved by the thread profile of the conventional Buttress (BC) thread, and a corresponding shoulder and a sealing surface are added. Since the thread profile is specific to ensure the tensile and bending resistance of the thread, a sufficient complete thread length is necessary, and therefore, for tapered threads, the wall thickness of the pipe body end of the male connector is greater than the nominal wall thickness of the pipe body. The sealing structure mainly adopts the metal-to-metal sealing mode, and the sealing is usually performed between a spherical surface and a conical surface, between the conical surface and the conical surface, between the spherical surface and a cylindrical surface or by adopting the sealing of the two types of sealing. The sealing structure form determines that the ovality of the sealing surface has great influence on sealing, so that a machining process with small ovality and high requirement on the pipe body is required. The above analysis shows the following significant disadvantages: 1) The geometric dimension of the pipe body and the machining quality of the threads need high requirements; 2) The processing technique process and the used consumables are obviously increased, and the processing efficiency is obviously reduced. The practice and research of pipe processing enterprises show that statistics show that the processing time of a special threaded joint coupling is 30-40 minutes, and the external thread is 5-8 minutes which is 5-8 times of that of an API round thread. Taken together, conventional API round threads are the simplest and most economical form of joint in the current oil casing market.
Therefore, how to develop a high-performance thread without increasing the cost is extremely important, so that the use cost of the oil casing can be reduced on the premise of ensuring the safety of a pipe column, and convenience is brought to oil field development.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a high-performance thread for an oil and gas field, which utilizes a coating technology to improve the sealing performance and the anti-buckling performance of a steel thread.
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 a polyurea elastomer on the surface of the bottom tooth bottom of the external thread, and standing;
(3) After the polyurea elastomer is cured, coating long-chain polymer glue on the surface of the full thread, then spraying solid lubricating particles on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 30-35 days;
the long-chain polymer glue is prepared by the following method: adding polyacrylic acid and catechol into deionized water, then adding boric acid solution, adjusting the pH to 9.0 by NaOH solution under the protection of nitrogen, and mechanically stirring.
Preferably, the ratio of polyacrylic acid, catechol and deionized water is 1g:1g: (5-8) mL; the molar ratio of the catechol to the 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 100-1500 μm.
Preferably, the coating thickness of the long-chain polymer glue is 5-20 μm.
Preferably, the spraying thickness of the sprayed solid lubricating particles is 100-500 μm.
Preferably, the solid lubricant particles are any one of polytetrafluoroethylene, graphene and molybdenum disulfide.
Preferably, the solid lubricant particles have a particle size of 1 to 10nm.
Preferably, the steel threads are API threads machined according to the 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 low cost, and good thread gluing resistance and sealing performance.
Drawings
FIG. 1 the profile of example 1 after 5 breakouts on the thread;
FIG. 2 is a graph of the thread of comparative example 1 after 3 breakouts;
figure 3 topography after 5 trips on the thread of comparative example 2.
Detailed Description
The oil pipes processed in 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 the API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying PUA-500 polyurea elastomer with the thickness of 500 mu m on the bottom surface of the external thread, and standing;
(3) After the polyurea elastomer is cured, coating long-chain polymer glue with the thickness of 10 microns on the surface of the full thread, then spraying polytetrafluoroethylene particles with the thickness of 300 microns 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 method: according to the weight ratio of 1g:1g:5mL, adding polyacrylic acid and catechol into deionized water, and then adding 0.5mol/L boric acid solution, wherein the molar 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 the API buttress thread according to the API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying PUA-500 polyurea elastomer with the thickness of 200 mu m on the bottom tooth bottom surface of the external thread, and standing;
(3) After the polyurea elastomer is cured, coating long-chain polymer glue with the thickness of 15 microns on the surface of the full thread, then spraying graphene particles with the thickness of 500 microns 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 method: according to the weight ratio of 1g:1g:5mL, adding polyacrylic acid and catechol into deionized water, and then adding 0.5mol/L boric acid solution, wherein the molar 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 the API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying PUA-500 polyurea elastomer with the thickness of 100 mu m on the bottom tooth bottom surface of the external thread, and standing;
(3) After the polyurea elastomer is cured, coating long-chain polymer glue with the thickness of 5 microns on the surface of the full thread, then spraying molybdenum disulfide particles with the thickness of 200 microns 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 method: according to the weight ratio of 1g:1g: adding polyacrylic acid and catechol into deionized water, and then adding a 1mol/L boric acid solution, wherein the molar ratio of the catechol to the boric acid is 4:1, adjusting the pH value 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 the API buttress circular threads according to the API 5B standard, cleaning the threads with alcohol, and drying the threads for later use;
(2) Spraying PUA-500 polyurea elastomer with the thickness of 1500 mu m on the bottom surface of the external thread, and standing;
(3) After the polyurea elastomer is cured, coating long-chain polymer glue with the thickness of 20 microns on the surface of the full thread, then spraying polytetrafluoroethylene with the thickness of 100 microns 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 method: according to the weight ratio of 1g:1g:5mL, adding polyacrylic acid and catechol into deionized water, and then adding 0.5mol/L boric acid solution, wherein the molar 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 preparation method of the high-performance thread for the oil and gas field comprises the following steps:
(1) Processing API round threads according to the API 5B standard, cleaning with alcohol, and drying for later use;
(2) Spraying PUA-500 polyurea elastomer with the thickness of 500 mu m on the bottom surface of the external thread, and standing;
(3) And after the polyurea elastomer is cured, coating E44 epoxy glue with the thickness of 10 microns on the surface of the full thread, then spraying polytetrafluoroethylene particles with the thickness of 300 microns on the surface of the epoxy glue to form a solid lubricating layer, and standing for 30 days.
Comparative example 2
And processing the uncoated oil pipe into API round threads according to the API 5B standard.
1. Anti-galling 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 2427N. M (1.25 times the API recommended torque) in the oil industry Standard SY/T6238.2 full-size test method oil well pipe, casing thread make-up and break-out tests. The thread morphologies of 5 times the thread of example 1 was made up, 3 times the thread of comparative example 1 was made up, and 5 times the thread of comparative example 2 was made up are shown in fig. 1 to 3, respectively. And comparative example 1 are shown in figures 1 and 2, respectively. Therefore, the high-performance thread gluing resistance prepared in the example 1 is good, the coating of the comparative example 1 is obviously peeled off, and the adhesive property of the comparative example 2 is obvious.
2. Sealing performance detection
The thread prepared in the embodiment 1 is subjected to a sealing experiment according to SY/T6128-2012 'test method for evaluating performance of threaded joints of sleeves and oil pipes', leakage does not occur until the pressure is 92.6MPa, the thread prepared in the comparative example 1 is pressurized to 75.2MPa and leakage occurs, and the internal pressure resistance strength of an N80 oil pipe prepared according to the API standard is required to be more than 72.88MPa, so that the sealing performance of the thread prepared by the method disclosed by the invention meets the standard requirement and is equivalent to the performance of a special thread. Whereas the thread of comparative example 2 did not have sealing properties.
3. Cost calculation
By adopting the technical scheme of the invention, the cost for improving the performance of the thread is about 110% of that of the uncoated thread by utilizing the coating technology only on the basis of the API round thread, so that the thread has the advantage of low cost compared with the special thread.
Claims (9)
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 a polyurea elastomer on the surface of the bottom tooth bottom of the external thread, and standing;
(3) After the polyurea elastomer is cured, coating long-chain polymer glue on the surface of the full thread, then spraying solid lubricating particles on the surface of the long-chain polymer glue to form a solid lubricating layer, and standing for 30-35 days;
the long-chain polymer glue is prepared by the following method: adding polyacrylic acid and catechol into deionized water, then adding boric acid solution, adjusting the pH to 9.0 by using NaOH solution under the protection of nitrogen, and mechanically stirring.
2. The method for preparing high-performance thread for oil and gas fields according to claim 1, wherein the method comprises the following steps: the proportion of polyacrylic acid, catechol and deionized water is 1g:1g: (5-8) mL; the molar ratio of the catechol to the boric acid is (2-4): 1.
3. the method for preparing high-performance thread for oil and gas fields according to claim 2, wherein: the concentration of the boric acid solution is 0.5-1mol/L.
4. The method for preparing high-performance thread for oil and gas fields according to claim 3, wherein: the spraying thickness of the spraying polyurea elastomer is 100-1500 mu m.
5. The method for preparing high-performance thread for oil and gas fields according to claim 4, wherein the method comprises the following steps: the coating thickness of the long-chain polymer glue is 5-20 mu m.
6. The method for preparing the high-performance thread for the oil and gas field according to claim 5, wherein the method comprises the following steps: the spraying thickness of the spraying solid lubricating particles is 100-500 mu m.
7. The method for preparing high-performance thread for oil and gas fields according to claim 6, wherein the method comprises the following steps: the solid lubricating particles are any one of polytetrafluoroethylene, graphene and molybdenum disulfide.
8. The method for preparing high-performance thread for oil and gas fields according to claim 7 is characterized in that: the solid lubricant particles have a particle size of 1 to 10nm.
9. The method for preparing high-performance thread for oil and gas fields according to claim 1, wherein the method comprises the following steps: the steel threads are API threads processed according to the API 5B standard.
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| CN202211534879.9A CN115709159B (en) | 2022-12-02 | 2022-12-02 | Preparation method of high-performance screw thread for oil and gas field |
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| CN202211534879.9A CN115709159B (en) | 2022-12-02 | 2022-12-02 | Preparation method of high-performance screw thread for oil and gas field |
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| CN115709159A true CN115709159A (en) | 2023-02-24 |
| CN115709159B CN115709159B (en) | 2023-09-29 |
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| 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 |
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2022
- 2022-12-02 CN CN202211534879.9A patent/CN115709159B/en active Active
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