Method for prolonging service life of vacuum insulated oil tube by filling high-pressure argon

Abstract

The invention relates to a method for prolonging the service life of a vacuum insulated oil tube by filling high-pressure argon. The method includes the following steps that firstly, an annular space of the vacuum insulated oil tube is filled with the high-pressure argon, and the heat conductivity coefficient of the high-pressure argon meets the C-level requirement of the vacuum insulated oil tube, wherein 0.02 W / (m*k)<=C<0.04 W / (m*k), and the initial filling pressure intensity of the high-pressure argon filled into the annular space of the vacuum insulated oil tube is 0.5 MPa-5.0 MPa; secondly, after the vacuum insulated oil tube filled with the high-pressure argon has the hydrogen permeation phenomenon, the high-pressure argon filled in the annular space and the permeated hydrogen form hydrogen-argon mixed gas, so the heat conductivity coefficient of the vacuum insulated oil tube is effectively reduced, and the service life of the vacuum insulated oil tube is prolonged. The method for prolonging the service life of the vacuum insulated oil tube by filling the high-pressure argon can effectively reduce the heat conductivity coefficient of the gas in the annular space after hydrogen permeation and can be widely applied to thickened oil thermal recovery technologies.

Description

technical field [0001] The invention relates to a method for prolonging the life of a vacuum heat-insulating oil pipe, in particular to a method for filling a high-pressure argon gas to prolong the life of a vacuum heat-insulating oil pipe. Background technique [0002] Thermal recovery of heavy oil usually adopts high-temperature steam stimulation technology, and in order to reduce heat energy loss, heat-insulated oil pipes are used to transport steam. Oil pipes using vacuum insulation technology usually have the best heat insulation effect, but in practice, vacuum heat insulation oil pipes often fail early in a few months or a year or two, and offshore operations are much more difficult than land operations, so extend the heat insulation The question of the effective use time of the oil pipeline is very important. [0003] Analyzing the cause of premature failure of the vacuum insulation tubing, it can be found that this is because the water vapor injected downhole is oft...

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Problems solved by technology

[0004] Commonly used metal materials such as steel cannot completely prevent hydrogen from passing through. Existing methods include increasing the amount of hydrogen adsorbed in the annulus, adding a coating to reduce hydrogen permeation on the pipe wall, and using alloy materials to reduce the rate of hydrogen permeation. However, hydrogen permeation causes The problem of premature failure of oil pipes cannot be completely solved, and the above methods cannot meet industrial requirements