Research on Optimal Selection of Drainage Gas Recovery Technology Based on Critic-ahp Combination Weighting and Mahalanobis Distance Topsis Method

Abstract

Guo Chenhao

Drainage and gas production technology is an important process technology for increasing production in gas fields in the later stage. In order to optimize the drainage and gas production technology for gas wells with liquid accumulation, a TOPSIS model based optimization study was conducted based on the technical and economic adaptability analysis of different drainage and gas production technology and well condition parameters. This model characterizes the priority level of each alternative solution by calculating the distance and relative progress between each alternative solution and the ideal solution. In response to the problem that the weights determined by traditional single weighting methods cannot meet the principle of subjective and objective unity, the CRITIC-AHP combination weighting method is proposed. Based on the subjective and objective weighting, the optimal weight is calculated based on the concept of game theory; A Mahalanobis distance calculation model based on the modified Cosine correlation coefficient matrix and absolute ideal point representation is proposed to address the Euclidean distance failure and reverse order issues caused by the correlation and dimensional inconsistency between indicators in the TOPSIS method. Combined with actual production data, a comprehensive evaluation system for economic and technical indicators of drainage and gas production processes is established, and the well condition parameters of XX well are selected for optimal drainage and gas production processes. The results show that after implementing the drainage gas production process, the average water production of XX well increased from 29.41m3 /d when liquid was accumulated, and the gas production was less than 1200m3 /d. The gas production increased to 8500-9200m3 /d, with a significant increase in production.

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