Elastic gas sealing gasket and sealing method for gas sealing of common screw thread oil pipe

Abstract

The invention discloses an elastic gas sealing gasket and sealing method for gas sealing of a common screw thread oil pipe. The elastic gas sealing gasket is in a cylindrical shape as a whole and justfills in a "J-shaped area" so as to eliminate the adverse effect of vortex flow on sealing performance. The wall surface of the elastic gas sealing gasket is in a corrugated shape, and the two ends of the elastic gas sealing gasket separately abut against two male buckle end surfaces. Under the action of external force, the distance between the two ends, that is, the height of the elastic gas sealing gasket can be changed. When the height of the elastic gas sealing gasket becomes smaller, corrugation on the wall surface are more dense and more closely adhere to the inner wall of a coupling, so that the sealing effect is enhanced at the connecting thread position; and in addition, the elastic gas sealing gasket is directly placed in the oil pipe, so the elastic gas sealing gasket can be removed from the oil pipe and reused, thereby further reducing the use cost.

Description

technical field [0001] The invention relates to a gasket used in gas wells, gas drive injection-production wells and other wells where gas medium exists, in particular to an elastic gas gasket and a sealing method for gas sealing of common thread oil pipes. Background technique [0002] In gas wells and gas drive injection-production wells, due to the existence of gas medium, the requirements for the sealing capacity of tubing are higher than those of ordinary oil and water wells; nowadays, most of the gas wells and gas drive injection-production wells use special gas-tight button-type tubing strings to improve the performance of the tubing. However, the cost of special button-type tubing is too expensive, which greatly increases the cost of injection and production, and due to the particularity of the material of the special gas-tight button-type, it is often necessary to replace all the tubing during re-completion operations. [0003] Ordinary threaded tubing is also calle...

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Problems solved by technology

[0005] In addition, when two ordinary threaded oil pipes are fastened through the oil pipe collars, such as figure 1 As shown in , the female thread oil pipe / coupling box 001 and the male thread oil pipe 002 are fixed by the coupling, and the female thread end face 003 of the female thread oil pipe / coupling box 001 and the male end face of the male thread oil pipe 002 are fixed. 005 and 004 on the inner wall of the coupling form a groove, which is generally called "J-shaped area" in the industry; during the high-speed flow of gas in the oil pipe, eddy currents will be formed in the "J-shaped area", resulting in an underpressure area , which is not conducive to the sealing of the thread; more seriously, the gas will have an erosion effect here, which will adversely affect the sealing effect of the box

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