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Gas seal threaded joint structure suitable for SAGD thermal production well pipe column connection

A threaded joint and hermetic sealing technology, which is applied in the direction of drilling pipes, casings, and mining fluids, can solve the problems of reduced contact pressure on the sealing surface, loss of sealing ability, shortened contact length of the sealing surface, etc., and achieves excellent sealing integrity. Effect

Pending Publication Date: 2020-08-04
JIANGSU VALIN XIGANG SPECIAL STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If the joint sealing method with conical surface interference fit is applied to SAGD thermal recovery wells, the following problems will occur: under the repeated cycle of high temperature and low temperature, the contact part of the sealing surface will move with the fluctuation of temperature, and due to stress relaxation The contact pressure of the sealing surface will gradually decrease, and the effective contact length of the sealing surface will gradually become shorter.
In the case of multiple thermal cycles, the contact pressure of the sealing surface will gradually decrease or even reach zero, and finally lose the sealing ability

Method used

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  • Gas seal threaded joint structure suitable for SAGD thermal production well pipe column connection
  • Gas seal threaded joint structure suitable for SAGD thermal production well pipe column connection
  • Gas seal threaded joint structure suitable for SAGD thermal production well pipe column connection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The outer diameter D=219.08mm, wall thickness t=8.94mm casing.

[0060] The data of the sealing surface of the female end are as follows: According to the range of θ in formula 1, determine θ=3°. According to formula 2, determine the rounding angle between the conical surface and cylindrical surface of the female sealing surface as R b = 5mm. Calculated according to formula 3 to get L u The range is 10.95 ~ 19.17mm, determine the L u = 15 mm. Calculated according to formula 5 to get L s The range is 2.25 ~ 3.75mm, determine the L s = 3 mm. According to formula 4 calculation can get L t =15-3=12mm. Determine R according to Equation 6 k = 5mm.

[0061] The data of the sealing surface of the male end are as follows: L is calculated according to formula 7 e The range is 15 ~ 19.5mm, determine the L e =17mm. The range of calculating a according to formula 9 is: 0.26≤a≤0.42mm, and a=0.3mm is determined. Calculated according to Formula 10, the range of the radius...

Embodiment 2

[0064] The outer diameter of specification D=244.48mm, the casing of wall thickness t=10.03mm.

[0065] The data of the sealing surface of the female end are as follows: According to the range of θ in formula 1, determine θ=10°. According to formula 2, determine the rounding angle between the conical surface and cylindrical surface of the female sealing surface as R b = 5mm. Calculated according to formula 3 to get L u The range is 12.22 ~ 21.39mm, determine the L u = 16 mm. Calculated according to formula 5 to get L s The range is 2.4 ~ 4mm, determine the L s = 3.2 mm. According to formula 4 calculation can get L t =16-3.2=12.8mm. Determine R according to Equation 6 k = 6 mm.

[0066] The data of the sealing surface of the male end are as follows: L is calculated according to formula 7 e The range is 16 ~ 20.8mm, determine the L e = 18.5 mm. The range of calculating a according to formula 9 is: 0.25≤a≤0.42mm, and a=0.33mm is determined. Calculated according to f...

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Abstract

The invention relates to a gas seal threaded joint structure suitable for SAGD thermal production well pipe column connection. The structure comprises a male end A and a female end B, wherein the female end B comprises a female thread E with taper, a tool withdrawing groove, a female sealing surface G and a female shoulder J, and the male end A comprises a male thread C with taper, a male sealingsurface F and a male shoulder H; the female sealing surface G comprises a conical surface and a cylindrical surface, the conical surface is connected with the tool withdrawing groove, and the cylindrical surface is connected with the female shoulder J; the male sealing surface F comprises an arc surface, one end of the arc surface is in transition with the male thread C directly or through a cylindrical surface, the cylindrical surface is tangent with the arc surface, and the other end of the arc surface is in direct transition with the male shoulder; and when the male end and the female end are screwed in place, the male thread C and the female thread E are meshed with each other, the female sealing surface C and the male sealing surface F are sealed through interference contact of the conical surface and the arc surface, and the male shoulder and the female shoulder are opposite to each other. Under the complex working conditions of high-temperature circulation and internal pressurecirculation of a pipe column, excellent sealing integrity and structural integrity are provided for connection of the pipe column.

Description

technical field [0001] The invention relates to a sealed threaded joint structure. Background technique [0002] Oil sands refer to sedimentary sands rich in natural bitumen, which are extracted in a way that is quite different from conventional oil extraction. The mining technology is mainly steam assisted gravity drainage (SAGD). SAGD, referred to as Steam Assisted Gravity Drainage (Steam Assisted Gravity Drainage), is a method of injecting steam from a vertical well or a horizontal well above a horizontal production well located near the bottom of the reservoir, and the heated crude oil and steam condensate are discharged from the oil reservoir. The oil recovery method produced by horizontal wells at the bottom of the reservoir has the advantages of high oil recovery capacity, high oil-gas ratio, high ultimate recovery factor, reduced inter-well interference, and avoiding premature inter-well channeling. [0003] The Chinese patent document with application number 20141...

Claims

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Application Information

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IPC IPC(8): E21B17/08E21B43/24
CPCE21B17/08E21B43/2406
Inventor 史彬梅丽杨永昌谢冠男王晟姚勇张志远
Owner JIANGSU VALIN XIGANG SPECIAL STEEL