Leakage detection method for gas injection pipe column in oil and gas field

Abstract

The invention provides a leakage detection method for a gas injection pipe column in an oil and gas field, and belongs to an injection well gas injection pipe column leakage detection method. According to the method, a method of adopting the matching of a running plug and a downhole television and combining with annulus pressing is provided, the aim of implementing leakage point inspection on thegas injection pipe column is achieved. Compared with a current leakage detection method, the downhole television is adopted for implementing detection, and the situation of the inner wall of the gas injection pipe column is observed in real time, so that intuition and high efficiency are realized; according to the method, the downhole television is applied to leakage detection of a gas injection well, so that convenience and quickness are realized, and the result is accurate; and the method is simple in construction process and reliable in detection result, and provides a new method for leakage detection of a completion pipe string of the injection well of the oil and gas field.

Description

technical field [0001] The invention belongs to the field of measuring the leakage, intrusion or movement of certain liquids in boreholes or wells, and in particular relates to a method for finding leaks of gas injection pipe strings in oil and gas fields. Background technique [0002] At present, many old oil fields have entered the stage of tertiary oil recovery. 2 , associated gas and other gas flooding to exploit oil and gas reservoirs. For gas injection wells, the gas-tight performance of the gas injection string is the core issue. Although the completion of injection wells in major oilfields generally uses special tubing equipped with gas-tight buckles such as BGT and FOX, but due to the The combination of factors such as pipe string expansion and contraction caused by pipe string temperature and pressure changes and pipe string self-weight caused thread leakage in some completion strings, and the ideal sealing state cannot be achieved. Gas leaking into the annulus m...

AI Technical Summary

Problems solved by technology

[0004] Tracer detection is the method of finding pipe string leaks. For different gas injection gases, it is difficult to determine the type of tracer and it is difficult to run the tracer detection instrument in the wellbore with the completion string. It is difficult to determine the specific The location of the leak point

[0005] The method of pulling out the pipe string to find leaks, because the threaded thread leakage usually occurs under the stress state of the wellbore and the threaded thread usually has no obvious damage, it is difficult to find the leak point even when the pipe string is pulled out, and the leak point search is blind and difficult. look up

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