基于层次分析法和熵权法的地下储气库注气方案优选

Optimization of Gas Injection Schemes for Underground Gas Storage Based on AHP and Entropy Method

针对地下储气库注气方案综合评价涉及因素较多的问题,提出基于改进的层次分析法(AHP)和熵权法相结合的综合评价模型,确定包括注气井数量、注气井层位、注气井注气能力、系统单位电耗、机组效率等9个评价指标的综合权重,采用模糊隶属函数法对评价指标进行无量纲化处理得到各指标的标准评价值,并用线性加权法计算各方案总评分,确定出最优注气方案。笔者以国内某枯竭油气藏型地下储气库为例,对同一注气量工况下的各注气方案进行综合评价,实现储气库注气方案的优选。优选结果与现场使用方案一致。结果表明:层次分析法与熵权法结合使用兼具主观性和客观性,使得注气方案评价更加客观、准确、可靠,对地下储气库最优注气方案的确立提供了一定的借鉴作用。

Aiming at the problem of comprehensive evaluation of gas injection scheme in underground gas storage, a comprehensive evaluation model based on improved AHP and entropy weight method is proposed to determine the number of gas injection wells, the depth of gas injection wells, gas injection capacity, system unit power consumption, unit efficiency and so on. The fuzzy membership function method was used to obtain the standard evaluation value of each index, and the total score of each scheme is calculated by linear weighting method, to determine the optimal gas injection program. Taking the gas storage of a depleted gas reservoir in China as an example, the gas injection scheme under the same gas injection condition is evaluated synthetically, to select the optimal gas storage gas injection scheme. The results consistent with field show that the combination of analytic hierarchy process and entropy method is subjective and objective, which makes the evaluation of gas injection scheme more objective, accurate and reliable and provides a reference for the determination of the optimal gas injection scheme for un-derground gas storage.