Processing method for test data of injection well casing damage

Abstract

The invention discloses a processing method for test data of injection well casing damage, and solves the problem that different conditions about injection well casing damage of different periods in the block cannot be quantized and compared. The method comprises the following steps of firstly normalizing the data of casing damage describing corrosion main bodies of the respective wells, assigningdifferent weights for the percentage of casing in different degrees of corrosion according to the result of normalizing processing, modifying based on the number of pipe segments of non-perforation section perforation, and calculating weighted sum values of the casing damage degrees of corrosion of the respective injection wells; calculating a relative grey relational degree between the weightedsum values of the casing damage degrees of corrosion of the injection wells and the collected productive factors influencing corrosion of the injection wells and the corrosive environmental factors byusing a gray relational analysis grade method, and determining the rank of significant influencing factors and extent of the influence; finally clearly studying the corrosion mechanism of casing damage in the block, and making full use of the relevant information contained in the test data of casing damage of the injection wells, thereby extending the engineering application value of test projects of casing damage of injection wells.

Description

technical field [0001] The invention relates to the technical field of oil production engineering of oil and gas wells, in particular to a processing method for MIT-MTT casing damage test data of water injection wells. Background technique [0002] Casing quality is very important for water injection wells. With the continuous increase of oil and gas demand, the continuous application of enhanced oil recovery measures and the continuous extension of oil and gas well operation life, the service conditions of casing are becoming more and more harsh, and casing damage (hereinafter referred to as "casing damage") is becoming more and more serious, and the number of wells with casing damage is increasing year by year, seriously affecting the normal production of oil and gas, and even causing oil and gas wells to be scrapped and shut down, causing safety and environmental risks. Corrosion, especially pitting and perforation, is the main cause of casing damage (the number of casing...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above research status and existing problems, the present invention provides a method for processing the MIT-MTT casing damage test data of water injection wells, which solves the problem that the casing damage of different water injection wells in different periods cannot be quantitatively compared, and uses quantitative data and corrosion Environmental factors and production factors are correlated to further explore the casing damage corrosion mechanism. The specific scheme is as follows:

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