CN111898215A - Method for selecting special threaded oil casing sealing test sample - Google Patents
Method for selecting special threaded oil casing sealing test sample Download PDFInfo
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- CN111898215A CN111898215A CN202010648431.4A CN202010648431A CN111898215A CN 111898215 A CN111898215 A CN 111898215A CN 202010648431 A CN202010648431 A CN 202010648431A CN 111898215 A CN111898215 A CN 111898215A
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Abstract
The invention discloses a method for selecting a special threaded oil casing pipe sealing test sample, which is used for selecting the test sample with the worst sealing contact condition according to the parameter matching of the diameters of the small ends of internal and external threads, the parameter matching of the diameters of the large ends of the internal and external threads and the parameter matching of the diameters of internal and external sealing surfaces. The method fully increases the leakage tendency in the process of the sample sealing test, greatly enhances the reliability of the actual sealing capability of the threaded joint, and is beneficial to the selection of special threaded oil casings in oil fields.
Description
Technical Field
The invention relates to the field of oil casing test methods, in particular to a method for selecting a special threaded oil casing sealing test sample.
Background
In recent years, an important development trend of oil and gas exploration is to expand towards deep stratum, domestic gas wells are more than 8000 m, underground temperature is more than 200 ℃, gas pressure is more than 100MPa, and an oil sleeve is exposed to a high-temperature high-pressure environment, so that high requirements are provided for the sealing capability of the oil sleeve. The special threaded joint oil casing is sealed by metal/metal, has strong sealing capability and is widely used in high-temperature and high-pressure gas wells. In order to detect and evaluate the sealing capability of the special threaded joint oil casing, ISO13679-2002 (International Standard "test procedure for threaded connection of oil and gas Industrial casing and oil pipe") and APIRP5C5-2017 (American Standard "test procedure for threaded connection of oil and gas Industrial casing and oil pipe") are widely adopted at home and abroad at present. In the ISO13679 standard and the API RP5C5 standard, sealing test samples are selected by matching the pitch diameter parameters of the threads of the inner joint and the outer joint, matching the diameter parameters of the sealing surfaces of the inner joint and the outer joint and matching the taper of the threads, and because the pitch diameter (see D2 in figure 1) of the threads is far away from the sealing surface (see D4 in figure 1), the influence of the parameter change of the pitch diameter of the inner thread and the outer thread on the sealing surface is limited, the sealing capacity of the selected samples cannot truly reflect the actual minimum sealing capacity of the threaded joint of the specification, the reliability of test results is reduced, and the selection of special threaded oil casings in an oil field is influenced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for selecting a special threaded oil casing sealing test sample, which is characterized in that the test sample with the worst sealing contact condition is selected according to the parameter matching of the diameters of the small ends of the internal and external threads, the parameter matching of the diameters of the large ends of the internal and external threads and the parameter matching of the diameters of the internal and external sealing surfaces, the leakage tendency in the process of the sample sealing test is fully increased, and the reliability of the actual sealing capability of a threaded joint is enhanced.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a method for selecting a special threaded oil casing seal test sample selects a test sample with the worst seal contact condition according to the parameter matching of the diameters of small ends of internal and external threads, the parameter matching of the diameters of large ends of the internal and external threads and the parameter matching of the diameters of internal and external seal surfaces.
Further, the diameter of the small end of the external thread joint and the tolerance of the small end of the external thread joint are calculated according to the pitch diameter of the engaged thread, the tolerance of the engaged thread and the thread taper.
Further, the diameter of the large end of the external thread joint and the tolerance of the large end of the external thread joint are calculated according to the pitch diameter of the engaged thread, the tolerance of the engaged thread and the thread taper.
Further, the diameter of the small end of the internal thread of the female adapter and the tolerance of the small end of the internal thread are calculated according to the pitch diameter of the engaged thread, the tolerance of the engaged thread and the thread taper.
Further, the diameter of the large end of the internal thread of the female adapter and the tolerance of the large end of the internal thread are calculated according to the pitch diameter of the engaged thread, the tolerance of the engaged thread and the thread taper.
Furthermore, the tolerance of the diameter of the small end of the external thread joint is an upper deviation maximum value, and the diameter of the small end of the external thread is a maximum value within a set range value;
the diameter tolerance of the small end of the internal thread of the female adapter is a minimum lower deviation value, and the diameter of the small end of the internal thread is a minimum value within a set range value.
Furthermore, the tolerance of the diameter of the large end of the external thread joint is an upper deviation maximum value, and the diameter of the large end of the external thread is a maximum value within a set range value;
the diameter tolerance of the large end of the internal thread of the female adapter is a minimum lower deviation value, and the diameter of the large end of the internal thread is a minimum value within a set range value.
Furthermore, the diameter tolerance of the sealing surface of the external thread joint is a minimum lower deviation value, and the diameter of the sealing surface of the external thread joint is a minimum value within a set range value;
the diameter tolerance of the sealing surface of the female adapter is the maximum value of the upper deviation, and the diameter of the sealing surface of the female adapter is the maximum value within the set range value.
Further, the male and female thread joints are coated at a minimum thread compound coating amount within a set range of values.
Further, the pin joint and the box joint are made up according to a minimum make-up torque within a set range of values.
Compared with the prior art, the invention has at least the following beneficial effects: the invention solves the problem that the lowest sealing capability of the sealing sample of the special threaded oil casing is difficult to truly reflect in the existing physical test, and the test sample with the worst sealing contact condition is selected according to the parameter matching of the diameters of the small ends of the internal and external threads, the parameter matching of the diameters of the large ends of the internal and external threads and the parameter matching of the diameters of the internal and external sealing surfaces, so that the leakage tendency in the sealing test process of the sample is fully increased, the reliability of the actual sealing capability of the threaded joint is greatly enhanced, and the selection of the special threaded oil casing in the oil field site is facilitated.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of an assembly of an internal and external threaded joint;
FIG. 2 is a schematic view of a male connection;
fig. 3 is a schematic view of the female adapter.
Wherein: 1-an external thread joint; 11-external thread; 12-an outer sealing surface; 2-female screw joint; 21-internal thread; 22-inner sealing surface; d1-minor end diameter of engaged threads; d11-minor end diameter of external thread; d12-minor end diameter of internal thread; d2-pitch diameter of engaged threads; d21-pitch diameter of external thread; d22-pitch diameter of internal thread; d3-major end diameter of engaged threads; d31-major end diameter of external thread; d32-internal thread big end diameter; d4 — mating seal face diameter; d41-male joint sealing surface diameter; d42-female adapter sealing surface diameter.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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.
According to a certain specific embodiment of the invention, the method selects the test sample with the worst sealing contact condition according to the parameter matching of the diameters of the small ends of the internal and external threads, the parameter matching of the diameters of the large ends of the internal and external threads and the parameter matching of the diameters of the internal and external sealing surfaces, so that the leakage tendency of the test sample in the sealing test process is fully increased, and the reliability of the actual sealing capacity of the threaded joint is greatly enhanced.
The diameter D11 of the small end of the external thread joint 1 and the tolerance thereof are calculated according to the pitch diameter D2 of the engaged threads and the tolerance and the thread taper thereof.
The external thread large end diameter D31 of the external thread joint 1 and the tolerance thereof are calculated according to the engaged thread pitch diameter D2 and the tolerance and thread taper thereof.
The minor end diameter D12 of the female thread of the female adapter 2 and the tolerance thereof are calculated according to the pitch diameter D2 of the engaged thread and the tolerance and thread taper thereof.
The internal thread large end diameter D32 of the female adapter 2 and the tolerance thereof are calculated according to the engaged thread pitch diameter D2 and the tolerance and thread taper thereof.
The tolerance of the small end diameter D11 of the external thread of the male screw joint 1 is the maximum value of the upper deviation, and the small end diameter D11 of the external thread is the maximum value within a set range value (i.e., within the specification).
The tolerance of the small end diameter D12 of the internal thread of the female screw joint 2 is a minimum lower deviation value, and the small end diameter D12 of the internal thread is a minimum value within a set range value (namely within the technical requirement).
The tolerance of the external thread large end diameter D31 of the external thread joint 1 is the maximum value of the upper deviation, and the external thread large end diameter D31 is the maximum value within a set range value (namely within the technical requirement).
The tolerance of the internal thread large end diameter D32 of the female adapter 2 is a minimum lower deviation value, and the internal thread large end diameter D32 is a minimum value within a set range value (namely within the technical requirements).
The tolerance of the male joint sealing surface diameter D41 of the male joint 1 is the minimum value of the lower deviation, and the male joint sealing surface diameter D41 is the minimum value within a set range value (i.e., within the specification).
The female joint sealing surface diameter D42 tolerance of the female joint 2 is the maximum value of the upper deviation, and the female joint sealing surface diameter D42 is the maximum value within a set range of values (i.e., within specification).
The male thread joint 1 and the female thread joint 2 are coated according to the minimum thread compound coating amount within a set range value (namely within the technical requirement).
The male and female threaded joints 1 and 2 are fastened according to the minimum fastening torque within a set range value (i.e., within the specification).
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for selecting a special threaded oil casing seal test sample is characterized in that the test sample with the worst seal contact condition is selected according to the parameter matching of the diameters of the small ends of the internal thread and the external thread, the parameter matching of the diameters of the large ends of the internal thread and the external thread and the parameter matching of the diameters of the internal sealing surface and the external sealing surface.
2. The method for selecting the test sample for the sealing test of the special threaded oil casing according to claim 1, wherein the diameter (D11) of the small end of the external thread of the male adapter (1) and the tolerance thereof are calculated from the pitch diameter (D2) of the engaged thread, the tolerance thereof and the thread taper.
3. The method for selecting the test sample for the sealing test of the special threaded oil casing according to claim 1, wherein the diameter (D31) of the large end of the external thread of the male adapter (1) and the tolerance thereof are calculated from the pitch diameter (D2) of the engaged thread, the tolerance thereof and the thread taper.
4. The method for selecting a sample for a sealing test of a specially threaded oil casing according to claim 1, wherein the diameter (D12) of the small end of the female screw joint (2) and the tolerance thereof are calculated from the pitch diameter (D2) of the engaged screw, the tolerance thereof and the taper of the screw.
5. The method for selecting the test specimen for the sealing test of the special threaded oil casing according to claim 1, wherein the diameter (D32) of the large end of the internal thread of the female adapter (2) and the tolerance thereof are calculated from the pitch diameter (D2) of the engaged thread, the tolerance thereof and the thread taper.
6. The method for selecting a test piece for sealing a special threaded oil casing according to claim 1, wherein the tolerance of the small end diameter (D11) of the male screw joint (1) is the maximum value of the upper deviation, and the small end diameter (D11) of the male screw is the maximum value within the set range;
the tolerance of the small end diameter (D12) of the internal thread of the female adapter (2) is a minimum lower deviation value, and the small end diameter (D12) of the internal thread is a minimum value in a set range value.
7. The method for selecting a test piece for sealing a special threaded oil casing according to claim 1, wherein the tolerance of the large end diameter (D31) of the male screw joint (1) is the maximum value of the upper deviation, and the large end diameter (D31) of the male screw is the maximum value within the set range;
the tolerance of the internal thread large end diameter (D32) of the female adapter (2) is a minimum lower deviation value, and the internal thread large end diameter (D32) is a minimum value in a set range value.
8. The method for selecting a test sample for sealing a special threaded oil casing according to claim 1, wherein the male joint sealing surface diameter (D41) of the male joint (1) is within a tolerance of a minimum lower deviation value, and the male joint sealing surface diameter (D41) is at a minimum value within a set range of values;
the female adapter sealing surface diameter (D42) tolerance of the female adapter (2) is the maximum value of the upper deviation, and the female adapter sealing surface diameter (D42) is the maximum value within the set range value.
9. The method for selecting a sample for a sealing test of a special threaded oil casing according to claim 1, characterized in that the male (1) and female (2) thread joints are coated with a minimum amount of thread compound within a set range of values.
10. The method for selecting a sample for a sealing test of a specially threaded oil casing according to claim 1, characterized in that the pin (1) and the box (2) are made up with a minimum make-up torque within a set range of values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010648431.4A CN111898215B (en) | 2020-07-07 | 2020-07-07 | Method for selecting special threaded oil sleeve sealing test sample |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010648431.4A CN111898215B (en) | 2020-07-07 | 2020-07-07 | Method for selecting special threaded oil sleeve sealing test sample |
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| CN111898215A true CN111898215A (en) | 2020-11-06 |
| CN111898215B CN111898215B (en) | 2024-05-28 |
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Citations (11)
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| CN2386183Y (en) * | 1999-02-25 | 2000-07-05 | 宝山钢铁(集团)公司 | Direct connecting type oil casing pipe |
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| CN202903062U (en) * | 2012-11-12 | 2013-04-24 | 中国石油天然气集团公司 | Examination gauge for special threaded connector of oil sleeve |
| CN103270146A (en) * | 2010-07-20 | 2013-08-28 | 特纳瑞斯连接有限责任公司 | Fittings with improved sealing, lubricity and corrosion resistance |
| CN103696705A (en) * | 2013-12-16 | 2014-04-02 | 天津商业大学 | Control method of interference amount of threads of buttress special threaded oil casing |
| JP2014105731A (en) * | 2012-11-26 | 2014-06-09 | Jfe Steel Corp | Screw joint for pipe |
| WO2015017660A1 (en) * | 2013-07-31 | 2015-02-05 | Future Pipe Industries Group Limited | 4-round thread form |
| WO2015089897A1 (en) * | 2013-12-18 | 2015-06-25 | 宝山钢铁股份有限公司 | Airtight casing joint |
| CN207238525U (en) * | 2017-04-11 | 2018-04-17 | 临海市四通制管有限公司 | A kind of Full automatic oil pipe tool joint monitor equipment |
| CN108982076A (en) * | 2018-04-11 | 2018-12-11 | 中国石油天然气集团有限公司 | A kind of gas well at HTHP oil pipe hermetic seal screw thread assay method |
| WO2019098882A1 (en) * | 2017-11-14 | 2019-05-23 | Акционерное общество "Первоуральский новотрубный завод" (АО "ПНТЗ") | Threaded joint for oilfield pipes |
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2020
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Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2386183Y (en) * | 1999-02-25 | 2000-07-05 | 宝山钢铁(集团)公司 | Direct connecting type oil casing pipe |
| CN201462256U (en) * | 2009-05-31 | 2010-05-12 | 段晋蓉 | Pipeline sealing device |
| CN103270146A (en) * | 2010-07-20 | 2013-08-28 | 特纳瑞斯连接有限责任公司 | Fittings with improved sealing, lubricity and corrosion resistance |
| CN202903062U (en) * | 2012-11-12 | 2013-04-24 | 中国石油天然气集团公司 | Examination gauge for special threaded connector of oil sleeve |
| JP2014105731A (en) * | 2012-11-26 | 2014-06-09 | Jfe Steel Corp | Screw joint for pipe |
| WO2015017660A1 (en) * | 2013-07-31 | 2015-02-05 | Future Pipe Industries Group Limited | 4-round thread form |
| CN103696705A (en) * | 2013-12-16 | 2014-04-02 | 天津商业大学 | Control method of interference amount of threads of buttress special threaded oil casing |
| WO2015089897A1 (en) * | 2013-12-18 | 2015-06-25 | 宝山钢铁股份有限公司 | Airtight casing joint |
| CN207238525U (en) * | 2017-04-11 | 2018-04-17 | 临海市四通制管有限公司 | A kind of Full automatic oil pipe tool joint monitor equipment |
| WO2019098882A1 (en) * | 2017-11-14 | 2019-05-23 | Акционерное общество "Первоуральский новотрубный завод" (АО "ПНТЗ") | Threaded joint for oilfield pipes |
| CN108982076A (en) * | 2018-04-11 | 2018-12-11 | 中国石油天然气集团有限公司 | A kind of gas well at HTHP oil pipe hermetic seal screw thread assay method |
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| CN111898215B (en) | 2024-05-28 |
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