The Research And Application Of Technical And Economic Comprehensive Evaluation Of Water Drainage And Gas Recovery Process In Western Sichuan Gas Field

Considered the study of geological features of western Sichuan gas field, the paperanalyses water production mechanism and factors affecting gas reservoirs, waterproduction features of gas production wells, and theory and applicability of varioustechnology of drainage and gas recovery in gas reservoirs by systematically collectingrelated drainage and gas recovery data of gas reservoirs in Xinchang Region、LuodaiRegion、Majing Region、Xindu Region. Further studies identified drainage and gasrecovery technological economic comprehensive evaluation index of the middle andshallow Gas reservoirs of Western Sichuan, Constructing a set of economic evaluationindex system suitable for the study area in western Sichuan. By comprehensiveevaluation models as Fuzzy Analytical Hierarchy Process、 Gray TOPSIS、 osculationvalue method and etc., it aimed to achieve an accurate assessment of the technicaleconomic processes evaluation. While carrying out comprehensive evaluation methodand comparative analyses of different mining, the optimal technology program isselected.Firstly, related data on gas reservoirs、field drainage and gas recovery economicdata and technical indicators data of Luodai Region、Majing Region、Xinchang Regionare collected comprehensively by data collection, field research, visits and otherinfrastructure work. Based on collecting and analyzing the data, the sensitivity analysesare performed on drainage and gas recovery technical and economic factors todetermine the main factor affecting process.Secondly, the gas production in western Sichuan gas field has not conductedsystematic economic evaluation currently so the technical and economic limitproduction of the various production processes cannot be determined. It is difficult todetermine the waste gas production under conditions of various mining model and tocalculate limit production、 increase production and capacity utilization at the balancepoint under various mining technology.Thirdly, based on sensitivity analysis of water drainage and gas recovery processtechnical economic factors and in accordance with the principles of the preferred gas mining process, the system of water drainage and gas recovery process technicaland economic comprehensive evaluation index is conducted.Lastly, determine the index weight and build suitable comprehensive economicassessment model for all water drainage and gas recovery technology(FuzzyAnalytical Hierarchy Process、 Gray TOPSIS、 osculation value method) by expertexperience method or AHP; Objectively evaluating the technical and economic effectsof the various processes provides proper guidance for selecting water drainage and gasrecovery process and investment.