基于多层次灰色关联分析法的致密气田集输工艺评价

Evaluating gathering-transportation process in tight gas fields based on multilevel and grey correlation analysis

致密气田地面集输工程具有建设投资高、工期长、影响因素多等特点,对气田集输工艺进行客观评价关系着气田开发建设全局。以致密气藏延气2-延128井区为例,针对高、中、低压等3套集输工艺进行优缺点分析,建立层次分析法评价指标体系,选取安全生产、工艺技术及经济效益共3项一级评价指标,细化形成井下节流器失效、管线积液、管网压损、集气半径、运行压力、征地面积、计量误差、内部收益率、投资、运行成本共10项二级评价指标,通过层次分析法确定各指标权重,运用灰色关联分析法对高、中、低压等3套集输方案进行评价优选。研究结果表明:①各评价指标权重从高到低依次为:内部收益率、投资、井下节流器失效、管网压损、运行成本、集气半径、管线积液、运行压力、征地面积、计量误差;②将层次分析法计算的指标权重引入灰色关联度分析,计算各方案的灰色关联度,最终确定中压集输工艺的关联度最高,是最优方案。研究结果可为今后国内外致密气田集输工艺的客观比选和决策提供评价手段和参考依据。

Most gathering-transportation projects in tight gas fields feature high investment,long construction period and numerous influencing factors.Their objective evaluation is related to the overall field development and construction.So,YQ2-Y128 well area was taken as an example to analyze both advantages and disadvantages of three gathering-transportation processes under high,medium and low pressure.Based on analytic hierarchy process(AHP),an evaluation system was established to select three first-grade evalu-ation indexes(production safety,process technology and economic benefits)and ten second-grade ones(throttle failure,liquid accu-mulation,pipe network pressure loss,gas-gathering radius,operating pressure,land acquisition,metering error,internal rate of return,investment,and operating costs).In addition,the weight was determined for each index by using AHP,and the method of grey cor-relation analysis(GCA)was adopted to evaluate these three processes.Results show that(i)the determined indexes rank in an order of descending weight,namely internal rate of return,investment,throttle failure,pressure loss,operating cost,gas-gathering radius,liquid accumulation,operating pressure,land acquisition,and metering error;and(ii)the obtained weight from AHP is introduced into GCA to determine the grey correlation for these processes one by one.As a result,it is determined that,as the optimal one,the gather-ing-transportation process under medium pressure enjoys the highest correlation.The research results can provide an evaluation means and reference for the objective comparison and decision of gathering-transportation processes in tight gas fields at home and abroad.