A heat-insulating, heat-preserving and wear-resistant oil pipe male end inner sealing device for oil wells

Abstract

The internal sealing device of the male buckle end of the heat-insulating and wear-resistant oil pipe for oil wells is used for the internal sealing and insulation of the male buckle end of the heat-insulating and wear-resistant oil pipe. It is characterized by: it is composed of a metal sealing sleeve and a first rubber sealing ring, a second rubber sealing ring, a third rubber sealing ring, and a fourth rubber sealing ring. Effect: It has been used in more than 150 oil wells on site. When the oil pipe column is subjected to a 35MPa-50MPa pressure operation, the internal sealing device of the male buckle end of the heat-insulating and wear-resistant oil pipe did not leak, and the inner tube of the heat-insulating and wear-resistant oil pipe did not show any damage. The success rate is 100%. The average wellhead temperature of the applied oil wells has increased by 23.7°C, and the average pump inspection cycle has been extended by 368 days, and is still continuing.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production engineering, and in particular to an inner sealing device for a heat-insulating, heat-preserving and wear-resistant oil pipe male buckle end for oil wells, which is used for sealing and heat preservation of the inner buckle end of the heat-insulating, heat-preserving and wear-resistant oil pipe, thereby ensuring that the wellhead temperature of the oil well is increased during the oil production process. Background Art

[0002] Chinese patent CN 110762211 A discloses a heat-insulating and wear-resistant oil pipe male end sealing device for oil wells, which is composed of a metal frame and a rubber jacket. During the production process of more than 100 oil wells, the wellhead temperature of the oil wells was increased by an average of 24.16°C, and the wear resistance and corrosion resistance of the heat-insulating and wear-resistant oil pipes were increased. The oil well pump inspection cycle was extended by an average of 176 days and is being extended. At the same time, the integrity rate of the male end sealing device on site is 100%. However, when the heat-insulating and wear-resistant oil pipe is applied to the oil pipe column with an explosive oil drainer installed on the oil well production pipe column, when a 35MPa-50MPa pressure operation is performed, the heat-insulating and wear-resistant oil pipe male end sealing device for oil wells provided by CN 110762211 A has the problems of poor sealing and damage to the inner tube of the heat-insulating and wear-resistant oil pipe. Summary of the invention

[0003] The purpose of the present invention is to provide an inner sealing device for the male buckle end of an oil well insulated and wear-resistant oil pipe, so as to achieve the purpose that when the oil pipe string is subjected to a 35MPa-50MPa pressure operation, the inner sealing device for the male buckle end of the oil pipe does not leak and the inner tube of the oil pipe is not damaged. The male buckle end and the female buckle end of two oil pipes insulated and wear-resistant are sealed and insulated, and the wear resistance and corrosion resistance of the oil pipe insulated and wear-resistant are increased, thereby extending the oil well pump inspection cycle.

[0004] The heat-insulating, heat-preserving and wear-resistant oil pipe male end inner sealing device for oil wells of the present invention comprises a metal sealing sleeve (1) and a first rubber sealing ring (17), a second rubber sealing ring (18), a third rubber sealing ring (19) and a fourth rubber sealing ring (20); the metal sealing sleeve (1) is processed into an integral body by a 2Cr13 seamless alloy steel pipe; the characteristics are:

[0005] The metal sealing sleeve (1) is composed of a first sealing end face (2), a first sealing section (3), a second sealing section (4), a first sealing groove (5), a third sealing section (6), a second sealing groove (7), a fourth sealing section (8), a fifth sealing section (9), a sixth sealing section (10), a seventh sealing section (11), a third sealing groove (12), an eighth sealing section (13), a fourth sealing groove (14), a ninth sealing section (15), and a second sealing end face (16);

[0006] The first sealing end face (2), the first sealing section (3), the second sealing section (4), the first sealing groove (5), the third sealing section (6), the second sealing groove (7), the fourth sealing section (8), the fifth sealing section (9), the sixth sealing section (10), the seventh sealing section (11), the third sealing groove (12), the eighth sealing section (13), the fourth sealing groove (14), the ninth sealing section (15), and the second sealing end face (16) are processed from a 2Cr13 seamless alloy steel pipe to form an integral metal sealing sleeve (1);

[0007] A first rubber sealing ring (17), a second rubber sealing ring (18), a third rubber sealing ring (19), and a fourth rubber sealing ring (20) are respectively arranged in the first sealing groove (5), the second sealing groove (7), the third sealing groove (12), and the fourth sealing groove (14);

[0008] The material of the metal sealing sleeve (1) is a 2Cr13 seamless alloy steel pipe with a specification of φ85mm×14.5mm. The 2Cr13 seamless alloy steel pipe is a commonly used raw material and is available on the market. The performance of the 2Cr13 seamless alloy steel pipe is described in detail in the article "Discussion on the Hot Rolling and Perforation Process of 2Cr13 Alloy Pipe" published in "Steel Pipe" No. 12, Volume 48, No. 6, 2019.

[0009] The processing method of the metal sealing sleeve (1) formed into an integral body by processing the 2Cr13 seamless alloy steel pipe is a conventional processing method in the machinery manufacturing industry and is well known to those skilled in the art; the processing manufacturer: Hebei Huanya Petroleum Drilling Technology Co., Ltd., unified social credit code: 91131128MA0D229A47;

[0010] The first sealing end surface (2) is a circular surface with an inner diameter of 59 mm and an outer diameter of 84 mm;

[0011] The first sealing section (3) is a cylinder with an inner diameter of 59 mm, an outer diameter of 84 mm and a length of 4 mm;

[0012] The second sealing section (4) is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 8 mm;

[0013] The first sealing groove (5) is a circular groove with an inner diameter of 59 mm, an outer diameter of 73 mm and a width of 4 mm;

[0014] The third sealing section (6) is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 2 mm;

[0015] The second sealing groove (7) is a circular groove with an inner diameter of 59 mm, an outer diameter of 73 mm and a width of 4 mm;

[0016] The fourth sealing section (8) is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 2 mm;

[0017] The fifth sealing section (9) is a cylinder with an inner diameter of 59 mm, an outer diameter of 72 mm and a length of 20 mm;

[0018] The sixth sealing section (10) is a cylinder with an inner diameter of 59 mm and a length of 24 mm;

[0019] The seventh sealing section (11) is a cylinder with an inner diameter of 59 mm and a length of 3 mm;

[0020] The third sealing groove (12) is a circular groove with an inner diameter of 67.4 mm, an outer diameter of 72 mm, and a width of 5.5 mm;

[0021] The eighth sealing section (13) is a cylinder with an inner diameter of 59 mm and a length of 3 mm;

[0022] The fourth sealing groove (14) is a circular groove with an inner diameter of 67.4 mm, an outer diameter of 72 mm, and a width of 5.5 mm;

[0023] The ninth sealing section (15) is a cylinder with an inner diameter of 59 mm and a length of 3 mm;

[0024] The second sealing end surface (16) is a circular surface with an inner diameter of 59 mm and an outer diameter of 72 mm;

[0025] The first rubber sealing ring (17) and the second rubber sealing ring (18) have specifications of φ78mm×3.1mm, are made of nitrile rubber, and are manufactured by Hebei Jubao Rubber & Plastic Technology Co., Ltd.

[0026] The third rubber sealing ring (19) and the fourth rubber sealing ring (20) have specifications of φ68mm×5mm and are made of nitrile rubber. The manufacturer is Hebei Jubao Rubber & Plastic Technology Co., Ltd.

[0027] Briefly describe the use of the heat-insulating, heat-preserving and wear-resistant oil pipe male end sealing device for oil wells:

[0028] ① The outer diameter of the heat-insulating and wear-resistant oil pipe for oil wells is 88.90mm and the inner diameter is 76mm. The inner diameter of the heat-insulating and wear-resistant oil pipe for oil wells is 59mm and the inner diameter is 54mm. 40Mn2 seamless alloy steel pipe;

[0029] ② Before assembly, the inner diameter of the thickened oil pipe male buckle end with an outer diameter of 88.90 mm and an inner diameter of 76 mm is processed to 78 mm, and the processing length is 20 mm, that is, the length of the second sealing section (4) is 8 mm + the width of the first sealing groove (5) is 4 mm + the length of the third sealing section (6) is 2 mm + the width of the second sealing groove (7) is 4 mm + the length of the fourth sealing section (8) is 2 mm;

[0030] ③ Assemble the inner sealing device of the male buckle end of the oil well heat-insulating and wear-resistant oil pipe from the thickened oil pipe male buckle end with an outer diameter of 88.90mm and an inner diameter of 76mm (20mm has been processed to 78mm) to complete a heat-insulating and wear-resistant oil pipe; assembly manufacturer: Hebei Huanya Petroleum Drilling Technology Co., Ltd., unified social credit code: 91131128MA0D229A47;

[0031] ④ The assembled insulated and wear-resistant oil pipe was tested by the "National Petroleum Pipe Quality Supervision and Inspection Center, Petroleum Pipe Testing Laboratory of the Pipe Research Institute of China National Petroleum Corporation" and its failure load was 1343.3KN, which is greater than the requirement of API TR5C-2018 (≥921.6KN); Report No.: (2020) Quality Inspection No. 193, Report Date: 2020-06-27.

[0032] "Qingdao Aidetech Testing Technology Co., Ltd." tested the pressure-bearing capacity of its 40Mn2 seamless alloy steel pipe (inner pipe), and the conclusion was: there was no explosion in the internal pressure test of 100MPa, and there was no pressure drop in the external pressure test of 50MPa×300s; Report number: ADTK20200713003; Report date: 2020-07-31.

[0033] ⑤The working principle is:

[0034] First, the second sealing section (4), the third sealing section (6), and the fourth sealing section (8) of 78 mm form a mechanical seal with the thickened oil pipe of 76 mm inner diameter (20 mm of which has been processed to 78 mm);

[0035] Second, the first rubber sealing ring (17) and the second rubber sealing ring (18) form two rubber sealing ring static seals;

[0036] The third is a mechanical seal formed by the first sealing section (3) and the thickened oil pipe male buckle end face with an outer diameter of 88.90 mm and an inner diameter of 76 mm (20 mm has been processed to 78 mm);

[0037] Fourth, a mechanical seal is formed between the inner tube and the sixth sealing section (10), the seventh sealing section (11), the eighth sealing section (13), and the ninth sealing section (15);

[0038] Fifth, the third rubber sealing ring (19) and the fourth rubber sealing ring (20) form two rubber sealing ring static seals;

[0039] Sixth, the outer diameter of the fifth sealing section (9) is 72 mm, which is smaller than the inner diameter of the thickened oil pipe of 76 mm, and the air section formed plays a role in heat preservation and heat insulation.

[0040] Beneficial technical effects: The present invention provides a heat-insulating, heat-preserving and wear-resistant oil pipe male end sealing device for oil wells, which has been applied in more than 150 oil wells on site. When the oil pipe column is subjected to a 35MPa-50MPa pressure operation, the heat-insulating, heat-preserving and wear-resistant oil pipe male end internal sealing device does not leak, and the heat-insulating, heat-preserving and wear-resistant oil pipe inner tube does not appear to be damaged. The success rate is 100%, and the wellhead temperature of the applied oil wells is increased by an average of 23.7°C, and the average pump inspection cycle is extended by 368 days, and is still continuing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The invention is a cross-sectional schematic diagram of an inner sealing device of a heat-insulating, heat-preserving and wear-resistant oil pipe male buckle end for oil wells.

[0042] Figure 1 In the figure, 1-metal sealing sleeve; 2-first sealing end face; 3-first sealing section; 4-second sealing section; 5-first sealing groove; 6-third sealing section; 7-second sealing groove; 8-fourth sealing section; 9-fifth sealing section; 10-sixth sealing section; 11-seventh sealing section; 12-third sealing groove; 13-eighth sealing section; 14-fourth sealing groove; 15-ninth sealing section; 16-second sealing end face; 17-first rubber sealing ring; 18-second rubber sealing ring; 19-third rubber sealing ring; 20-fourth rubber sealing ring. Specific embodiments

[0043] Embodiment 1: Taking the heat-insulating, heat-preserving and wear-resistant oil pipe for oil wells with an outer diameter of 88.9 mm as an example, the inner sealing device of the male buckle end of the heat-insulating, heat-preserving and wear-resistant oil pipe for oil wells is described.

[0044] See attached Figure 1 The present invention discloses a heat-insulating, heat-preserving and wear-resistant inner sealing device for a male buckle end of an oil pipe for an oil well, comprising: 1. a metal sealing sleeve; 2. a first sealing end face; 3. a first sealing section; 4. a second sealing section; 5. a first sealing groove; 6. a third sealing section; 7. a second sealing groove; 8. a fourth sealing section; 9. a fifth sealing section; 10. a sixth sealing section; 11. a seventh sealing section; 12. a third sealing groove; 13. an eighth sealing section; 14. a fourth sealing groove; 15. a ninth sealing section; 16. a second sealing end face; 17. a first rubber sealing ring; 18. a second rubber sealing ring; 19. a third rubber sealing ring; 20. a fourth rubber sealing ring.

[0045] The inner sealing device of the male buckle end of the heat-insulating and wear-resistant oil pipe for oil wells is composed of a metal sealing sleeve 1 and a first rubber sealing ring 17, a second rubber sealing ring 18, a third rubber sealing ring 19, and a fourth rubber sealing ring 20; the metal sealing sleeve 1 is processed into a whole by a 2Cr13 seamless alloy steel pipe; the characteristics are:

[0046] The metal sealing sleeve 1 is composed of a first sealing end face 2, a first sealing section 3, a second sealing section 4, a first sealing groove 5, a third sealing section 6, a second sealing groove 7, a fourth sealing section 8, a fifth sealing section 9, a sixth sealing section 10, a seventh sealing section 11, a third sealing groove 12, an eighth sealing section 13, a fourth sealing groove 14, a ninth sealing section 15, and a second sealing end face 16;

[0047] The first sealing end face 2, the first sealing section 3, the second sealing section 4, the first sealing groove 5, the third sealing section 6, the second sealing groove 7, the fourth sealing section 8, the fifth sealing section 9, the sixth sealing section 10, the seventh sealing section 11, the third sealing groove 12, the eighth sealing section 13, the fourth sealing groove 14, the ninth sealing section 15, and the second sealing end face 16 are processed from a 2Cr13 seamless alloy steel pipe to form an integral metal sealing sleeve 1;

[0048] The first sealing end face 2 is a circular surface with an inner diameter of 59 mm and an outer diameter of 84 mm;

[0049] The first sealing section 3 is a cylinder with an inner diameter of 59 mm, an outer diameter of 84 mm and a length of 4 mm;

[0050] The second sealing section 4 is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 8 mm;

[0051] The first sealing groove 5 is a circular groove with an inner diameter of 59 mm, an outer diameter of 73 mm and a width of 4 mm;

[0052] The third sealing section 6 is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 2 mm;

[0053] The second sealing groove 7 is a circular groove with an inner diameter of 59 mm, an outer diameter of 73 mm and a width of 4 mm;

[0054] The fourth sealing section 8 is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 2 mm;

[0055] The fifth sealing section 9 is a cylinder with an inner diameter of 59 mm, an outer diameter of 72 mm and a length of 20 mm;

[0056] The sixth sealing section 10 is a cylinder with an inner diameter of 59 mm and a length of 24 mm;

[0057] The seventh sealing section 11 is a cylinder with an inner diameter of 59 mm and a length of 3 mm;

[0058] The third sealing groove 12 is a circular groove with an inner diameter of 67.4 mm, an outer diameter of 72 mm, and a width of 5.5 mm;

[0059] The eighth sealing section 13 is a cylinder with an inner diameter of 59 mm and a length of 3 mm;

[0060] The fourth sealing groove 14 is a circular groove with an inner diameter of 67.4 mm, an outer diameter of 72 mm, and a width of 5.5 mm;

[0061] The ninth sealing section 15 is a cylinder with an inner diameter of 59 mm and a length of 3 mm;

[0062] The second sealing end face 16 is a circular surface with an inner diameter of 59 mm and an outer diameter of 72 mm;

[0063] The specifications of the first rubber sealing ring 17 and the second rubber sealing ring 18 are φ78mm×3.1mm and are made of nitrile rubber;

[0064] The third rubber sealing ring 19 and the fourth rubber sealing ring 20 have specifications of φ68mm×5mm and are made of nitrile rubber;

[0065] A heat-insulating, heat-preserving and wear-resistant oil pipe male end sealing device for oil wells has been used in more than 150 oil wells on site. When the oil pipe column is subjected to 35MPa-50MPa pressure operation, the heat-insulating, heat-preserving and wear-resistant oil pipe male end internal sealing device does not leak and the heat-insulating, heat-preserving and wear-resistant oil pipe inner tube does not appear to be damaged. The success rate is 100%. The wellhead temperature of the applied oil wells has been increased by an average of 23.7°C, and the average pump inspection cycle has been extended by 368 days, and is still continuing.

[0066] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inner sealing device for a heat-insulating, heat-preserving and wear-resistant oil pipe male end for oil wells, comprising a metal sealing sleeve (1) and a first rubber sealing ring (17), a second rubber sealing ring (18), a third rubber sealing ring (19) and a fourth rubber sealing ring (20); the metal sealing sleeve (1) is processed into an integral body by a 2Cr13 seamless alloy steel pipe; the characteristics are: The metal sealing sleeve (1) is composed of a first sealing end face (2), a first sealing section (3), a second sealing section (4), a first sealing groove (5), a third sealing section (6), a second sealing groove (7), a fourth sealing section (8), a fifth sealing section (9), a sixth sealing section (10), a seventh sealing section (11), a third sealing groove (12), an eighth sealing section (13), a fourth sealing groove (14), a ninth sealing section (15), and a second sealing end face (16); The first sealing end face (2), the first sealing section (3), the second sealing section (4), the first sealing groove (5), the third sealing section (6), the second sealing groove (7), the fourth sealing section (8), the fifth sealing section (9), the sixth sealing section (10), the seventh sealing section (11), the third sealing groove (12), the eighth sealing section (13), the fourth sealing groove (14), the ninth sealing section (15), and the second sealing end face (16) are processed from a 2Cr13 seamless alloy steel pipe to form an integral metal sealing sleeve (1); A first rubber sealing ring (17), a second rubber sealing ring (18), a third rubber sealing ring (19), and a fourth rubber sealing ring (20) are respectively arranged in the first sealing groove (5), the second sealing groove (7), the third sealing groove (12), and the fourth sealing groove (14); The material of the metal sealing sleeve (1) is 2Cr13 seamless alloy steel pipe, specification model: φ85mm×14.5mm; The first sealing end surface (2) is a circular ring surface with an inner diameter of 59 mm and an outer diameter of 84 mm; The first sealing section (3) is a cylinder with an inner diameter of 59 mm, an outer diameter of 84 mm and a length of 4 mm; The second sealing section (4) is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 8 mm; The first sealing groove (5) is a circular groove with an inner diameter of 59 mm, an outer diameter of 73 mm and a width of 4 mm; The third sealing section (6) is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 2 mm; The second sealing groove (7) is a circular groove with an inner diameter of 59 mm, an outer diameter of 73 mm and a width of 4 mm; The fourth sealing section (8) is a cylinder with an inner diameter of 59 mm, an outer diameter of 78 mm and a length of 2 mm; The fifth sealing section (9) is a cylinder with an inner diameter of 59 mm, an outer diameter of 72 mm and a length of 20 mm; The sixth sealing section (10) is a cylinder with an inner diameter of 59 mm and a length of 24 mm; The seventh sealing section (11) is a cylinder with an inner diameter of 59 mm and a length of 3 mm; The third sealing groove (12) is a circular groove with an inner diameter of 67.4 mm, an outer diameter of 72 mm, and a width of 5.5 mm; The eighth sealing section (13) is a cylinder with an inner diameter of 59 mm and a length of 3 mm; The fourth sealing groove (14) is a circular groove with an inner diameter of 67.4 mm, an outer diameter of 72 mm, and a width of 5.5 mm; The ninth sealing section (15) is a cylinder with an inner diameter of 59 mm and a length of 3 mm; The second sealing end surface (16) is a circular surface with an inner diameter of 59 mm and an outer diameter of 72 mm; The first rubber sealing ring (17) and the second rubber sealing ring (18) have specifications of φ78mm×3.1mm and are made of nitrile rubber; The third rubber sealing ring (19) and the fourth rubber sealing ring (20) have specifications of φ68mm×5mm and are made of nitrile rubber.

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