Comprehensive Evaluation of Coalbed Fracability Based on Dynamic Weight Function

doi:10.11885/j.issn.1674-5086.2020.08.07.01

Abstract

Abstract: The coalbed fracability directly affects the output of coalbed methane gas wells and the production cost of enterprises. In order to scientifically evaluate the fracability of coalbed, we take the coalbed geological parameters as the breakthrough point and use dynamic weight function to comprehensively evaluate the coalbed fracability. Firstly, according to the primary selection of coalbed geological parameters, the main influencing parameters are optimized by mathematical statistics. Secondly, by analyzing the subjective weighting method and the objective weighting method, we compare their advantages and disadvantages, and introduce the dynamic weighting function to evaluate the parameters of coalbed fracability. Thirdly, the weighting bubble sorting method of dynamic weight function is used to comprehensively evaluate the influence parameters, and the relationship between the dynamic weight and the production capacity is obtained according to the fitting. Finally, 26 wells in Block X are evaluated and compared with the actual productivity, the correct rate of fracability evaluation is 88.64%. The accuracy of the comprehensive evaluation model is verified.

Key words: coalbed fracability, fracability parameters, dynamic weight function, weighted bubble sorting, comprehensive evaluation

CLC Number:

TE357

GUO Dali, ZHANG Shuling, WANG Xuan, ZHEN Huaibin, WANG Chengwang. Comprehensive Evaluation of Coalbed Fracability Based on Dynamic Weight Function[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(2): 97-104.

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