阅读说明：本技术 一种油井用隔热保温防磨油管公扣端内密封装置 (Oil well is with thermal-insulated heat preservation abrasionproof oil pipe pin end internal seal device ) 是由 高向阳 于 2020-08-19 设计创作，主要内容包括：油井用隔热保温防磨油管公扣端内密封装置应用于隔热保温防磨油管的公扣端内密封和保温。其特征在于：由金属密封套和第一橡胶密封圈、第二橡胶密封圈、第三橡胶密封圈、第四橡胶密封圈组成。效果：现场150余口油井应用,在油管管柱进35MPa-50MPa打压操作时,隔热保温防磨油管公扣端内密封装置未发生泄漏、隔热保温防磨油管内管未出现损坏现象,成功率100％,应用油井井口温度平均提高23.7℃,平均检泵周期延长368天,并仍在延续。(The internal sealing device for the male buckle end of the heat-insulation wear-resistant oil pipe for the oil well is applied to internal sealing and heat insulation of the male buckle end of the heat-insulation wear-resistant oil pipe. The method is characterized in that: the rubber sealing device is composed of a metal sealing sleeve, a first rubber sealing ring, a second rubber sealing ring, a third rubber sealing ring and a fourth rubber sealing ring. The effect is as follows: when an oil pipe column is pressed to 35MPa-50MPa, the internal sealing device at the male buckle end of the heat-insulation heat-preservation anti-abrasion oil pipe does not leak, and the inner pipe of the heat-insulation heat-preservation anti-abrasion oil pipe is not damaged, the success rate is 100 percent, the temperature of the wellhead of the applied oil well is averagely increased by 23.7 ℃, the average pump inspection period is prolonged by 368 days, and the application is continued.)

1. The heat-insulation heat-preservation anti-abrasion oil pipe male buckle end inner sealing device for the oil well comprises a 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); the metal sealing sleeve (1) is formed by processing a 2Cr13 seamless alloy steel pipe into a whole; the method is characterized in that:

the metal seal sleeve (1) consists of a first seal end face (2), a first seal section (3), a second seal section (4), a first seal groove (5), a third seal section (6), a second seal groove (7), a fourth seal section (8), a fifth seal section (9), a sixth seal section (10), a seventh seal section (11), a third seal groove (12), an eighth seal section (13), a fourth seal groove (14), a ninth seal section (15) and a second seal end face (16);

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) are processed into an integral metal sealing sleeve (1) by 2Cr13 seamless steel pipes;

the metal sealing sleeve (1) is made of a 2Cr13 seamless alloy steel pipe, and is characterized in that the specification and the model are as follows: phi 85 is multiplied by 14.5.

The first end surface (2) is a torus with the inner diameter of 59mm and the outer diameter of 84 mm;

the first sealing section (3) is a cylinder with the inner diameter of 59mm, the outer diameter of 84mm and the length of 4 mm;

the second sealing section (4) is a cylinder with the inner diameter of 59mm, the outer diameter of 78mm and the length of 8 mm;

the inner diameter of the first sealing groove (5) is 59mm, the outer diameter is 73mm, and the width is 4 mm;

the third sealing section (6) is a cylinder with the inner diameter of 59mm, the outer diameter of 78m and the length of 2 mm;

the second sealing groove (7) is a circular groove with the inner diameter of 59mm, the outer diameter of 73mm and the width of 4 mm;

the inner diameter of the fourth sealing section (8) is 59mm, the outer diameter of the fourth sealing section is 78mm, and the length of the fourth sealing section is 2 mm;

the inner diameter of the fifth sealing section (9) is 59mm, the outer diameter of the fifth sealing section is 72mm, and the length of the fifth sealing section is 20 mm;

the inner diameter of the sixth sealing section (10) is 59mm, and the length of the sixth sealing section is 24 mm;

the seventh sealing section (11) is a cylinder with the inner diameter of 59mm and the length of 3 mm;

the inner diameter of the third sealing groove (12) is 67.4mm, the outer diameter of the third sealing groove is 72mm, and the width of the third sealing groove is 5.5 mm;

the inner diameter of the eighth sealing section (13) is 59mm, and the length of the eighth sealing section is 3 mm;

the fourth sealing groove (14) is a circular groove with the inner diameter of 67.4mm, the outer diameter of 72mm and the width of 5.5 mm;

the ninth sealing section (15) is a cylinder with the inner diameter of 59mm and the length of 3 mm;

and the inner diameter of the second sealing end surface (16) is 59mm, and the outer diameter of the second sealing end surface is 72 mm.

The specification and model of the first rubber sealing ring (17) and the second rubber sealing ring (18) are phi 78 multiplied by 3.1, and the materials are nitrile rubber;

the specification and model of the third rubber sealing ring (19) and the fourth rubber sealing ring (20) are phi 68 multiplied by 5, and the materials are nitrile rubber.

Technical Field

The invention relates to the technical field of oil extraction engineering, in particular to an internal sealing device for a male buckle end of a heat-insulation, heat-preservation and wear-resistant oil pipe for an oil well. The male buckle end for the heat insulation and heat preservation anti-abrasion oil pipe is internally sealed and heat preserved, so that the temperature of the wellhead of an oil well is improved in the oil extraction process.

Background

Chinese patent CN 110762211A discloses a heat-insulating and wear-resistant oil pipe male buckle end sealing device for an oil well, which consists of a metal framework (1) and a rubber outer sleeve (7). The temperature of the oil well mouth is improved by 24.16 ℃ averagely in the oil extraction process of more than 100 oil wells, the abrasion-resistant and corrosion-resistant capabilities of the heat-insulating and heat-preserving abrasion-resistant oil pipe are improved, the pump inspection period of the oil well is prolonged by 176 days averagely and continues. Meanwhile, the field integrity rate of the male buckle end sealing device is 100%. However, when the thermal insulation and wear prevention oil pipe is applied to the oil pipe column provided with the blasting type oil drainer on the oil production pipe column of the oil well, and the 35MPa-50MPa pressing operation is performed, the sealing device for the male buckle end of the thermal insulation and wear prevention oil pipe for the oil well, provided by CN 110762211A, has the problems of poor sealing and damage to the inner pipe of the thermal insulation and wear prevention oil pipe.

Disclosure of Invention

The purpose of the invention is as follows: the inner sealing device at the male buckle end of the heat-insulation heat-preservation anti-abrasion oil pipe for the oil well achieves the purposes that when an oil pipe column is pressed at 35MPa-50MPa, the inner sealing device at the male buckle end of the heat-insulation heat-preservation anti-abrasion oil pipe does not leak, and an inner pipe of the heat-insulation heat-preservation anti-abrasion oil pipe is not damaged. The male buckle end and the female buckle end of the two heat-insulation heat-preservation wear-resistant oil pipes are sealed and heat-preserved, the wear-resistant and corrosion-resistant capabilities of the heat-insulation heat-preservation wear-resistant oil pipes are improved, and the pump inspection period of an oil well is prolonged.

The invention relates to a heat-insulation and heat-preservation anti-wear oil pipe male buckle end inner sealing device for an oil well, which consists of a 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); the metal sealing sleeve (1) is formed by processing a 2Cr13 seamless alloy steel pipe into a whole; the method is characterized in that:

the metal seal sleeve (1) consists of a first seal end face (2), a first seal section (3), a second seal section (4), a first seal groove (5), a third seal section (6), a second seal groove (7), a fourth seal section (8), a fifth seal section (9), a sixth seal section (10), a seventh seal section (11), a third seal groove (12), an eighth seal section (13), a fourth seal groove (14), a ninth seal section (15) and a second seal end face (16);

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) are processed into an integral metal sealing sleeve (1) by 2Cr13 seamless steel pipes;

the metal sealing sleeve (1) is made of a 2Cr13 seamless alloy steel pipe, and is characterized in that the specification and the model are as follows: phi 85 is multiplied by 14.5; the 2Cr13 seamless alloy steel pipe is a common raw material and is commercially available; the performance of 2Cr13 seamless alloy steel tube is detailed in the text "hot-rolling and piercing process discussion of 2Cr13 alloy tube" published in 2019, volume 12, volume 48, and phase 6;

the processing method of the metal sealing sleeve (1) which is processed into a whole by the 2Cr13 seamless alloy steel pipe is a conventional processing method in the mechanical manufacturing industry and is well known by the technical personnel in the field; a processing manufacturer: the limited liability company of the petroleum drilling and mining science and technology in North Hei province, unifies social credit codes: 91131128MAOD229A 47;

the inner diameter of the first end surface (2) is 59mm, and the outer diameter of the first end surface is 84 mm;

the first sealing section (3) is a cylinder with the inner diameter of 59mm, the outer diameter of 84mm and the length of 4 mm;

the inner diameter of the second sealing section (4) is 59mm, the outer diameter of the second sealing section is 78mm, and the length of the second sealing section is 8 mm;

the inner diameter of the first sealing groove (5) is 59mm, the outer diameter is 73mm, and the width is 4 mm;

the third sealing section (6) is a cylinder with the inner diameter of 59mm, the outer diameter of 78mm and the length of 2 mm;

the inner diameter of the second sealing groove (7) is 59mm, the outer diameter is 73mm, and the width is 4 mm;

the inner diameter of the fourth sealing section (8) is 59mm, the outer diameter of the fourth sealing section is 78mm, and the length of the fourth sealing section is 2 mm;

the inner diameter of the fifth sealing section (9) is 59mm, the outer diameter of the fifth sealing section is 72mm, and the length of the fifth sealing section is 20 mm;

the inner diameter of the sixth sealing section (10) is 59mm, and the length of the sixth sealing section is 24 mm;

the seventh sealing section (11) is a cylinder with the inner diameter of 59mm and the length of 3 mm;

the third sealing groove (12) is a circular groove with the inner diameter of 67.4mm, the outer diameter of 72mm and the width of 5.5 mm;

the inner diameter of the eighth sealing section (13) is 59mm, and the length of the eighth sealing section is 3 mm;

the inner diameter of the fourth sealing groove (14) is a circular groove with the diameter of 67.4mm, the outer diameter of 72mm and the width of 5.5 mm;

the ninth sealing section (15) is a cylinder with the inner diameter of 59mm and the length of 3 mm;

the inner diameter of the second sealing end surface (16) is 59mm, and the outer diameter of the second sealing end surface is 72 mm;

the specification and model of the first rubber sealing ring (17) and the second rubber sealing ring (18) are phi 78 multiplied by 3.1, the material is nitrile rubber, and the manufacturing factory: hebei Jubao rubber and plastic science and technology Co., Ltd;

the specification and model of the third rubber sealing ring (19) and the fourth rubber sealing ring (20) are phi 68 multiplied by 5, the material is nitrile rubber, and the manufacturer: hebei Jubao rubber and plastic science and technology Co., Ltd;

briefly describing a use method of the sealing device for the male buckle end of the heat-insulation, heat-preservation and wear-resistant oil pipe for the oil well:

firstly, a thickened oil pipe with the outer diameter of 88.90mm and the inner diameter of 76mm is used as an outer pipe of a heat-insulation and heat-preservation anti-wear oil pipe for an oil well; the oil well is a 40Mn2 seamless alloy steel pipe with an inner pipe of a heat-insulation heat-preservation anti-wear oil pipe, the outer diameter of which is 59mm, and the inner diameter of which is 54 mm;

processing the inner diameter of the male buckle end of the thickened oil pipe with the outer diameter of 88.90mm and the inner diameter of 76mm into 78mm before assembly, wherein the processing length is 20mm, namely: the length of the second sealing section (4) is 8mm, the width of the first sealing groove (5) is 4mm, the length of the third sealing section (6) is 2mm, the width of the second sealing groove (7) is 4mm, and the length of the fourth sealing section (8) is 2 mm;

thirdly, assembling the internal sealing device at the male buckle end of the heat-insulation and heat-preservation anti-abrasion oil pipe for the oil well from the male buckle end of the thickened oil pipe with the outer diameter of 88.90mm and the inner diameter of 76mm (20 mm is processed into 78mm), and then finishing a heat-insulation and heat-preservation anti-abrasion oil pipe; an assembly manufacturer: the limited liability company of the petroleum drilling and mining science and technology in North Hei province, unifies social credit codes: 91131128MAOD229A 47;

the assembled heat-insulating and heat-preserving anti-abrasion oil pipe has the failure load of 1343.3KN which is larger than the requirement (not less than 921.6KN) of API TR5C-2018 detected by a national oil pipe quality supervision and inspection center and a petroleum pipe detection laboratory of the institute of pipe research of China oil and gas group company; report number: (2020) prime index 193, report date: 2020-06-27.

The pressure bearing capacity of the 40Mn2 seamless alloy steel tube (inner tube) is tested by Qingdao Edtek detection technology Limited company, and the conclusion is as follows: the inner pressure test is 100MPa, and the outer pressure test is 50MPa multiplied by 300s, and the pressure is not reduced; report number: ADTK 20200713003; the report date: 2020-07-31.

The action principle is as follows:

firstly, a second sealing section (4), a third sealing section (6) and a fourth sealing section (8) of 78mm and a thickened oil pipe of 76mm inner diameter (20 mm is machined into 78mm) form mechanical seal;

the first rubber sealing ring (17) and the second rubber sealing ring (18) form two static sealing of the rubber sealing rings;

thirdly, the first sealing section (3) and the end face of the male buckle of the thickened oil pipe with the outer diameter of 88.90mm and the inner diameter of 76mm (20 mm is processed into 78mm) form mechanical seal;

fourthly, the inner pipe forms mechanical seal with a sixth sealing section (10), a seventh sealing section (11), an eighth sealing section (13) and a ninth sealing section (15);

fifthly, a third rubber sealing ring (19) and a fourth rubber sealing ring (20) form two static sealing of the rubber sealing rings;

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

The beneficial technical effects are as follows: the invention provides a heat-insulation heat-preservation anti-abrasion oil pipe male buckle end sealing device for an oil well, which is applied to an oil well with more than 150 openings on site, when an oil pipe column is subjected to 35MPa-50MPa pressing operation, the sealing device in the heat-insulation heat-preservation anti-abrasion oil pipe male buckle end does not leak, the phenomenon of damage of an inner pipe of a heat-insulation heat-preservation anti-abrasion oil pipe occurs in the future, the success rate is 100 percent, the temperature of the wellhead of the applied oil well is averagely increased by 23.7 ℃, the average pump inspection period is prolonged by 368 days.

Drawings

FIG. 1 is a schematic cross-sectional view of an internal sealing device at a male buckle end of a heat-insulating and wear-resistant oil pipe for an oil well.

In fig. 1, 1-metal sealing sleeve; 2-a first sealing end face; 3-a first sealing section; 4-a second seal segment; 5-a first seal groove; 6-a third seal section; 7-a second seal groove; 8-a fourth seal segment; 9-a fifth seal segment; 10-a sixth seal segment; 11-a seventh seal segment; 12-a third seal groove; 13-an eighth seal segment; 14-a fourth seal groove; 15-a ninth seal segment; 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-fourth rubber seal ring.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION