多目标决策方法在煤层气井完井方式优选中的应用

Optimization of coalbed methane well completion using multiple objective decision method

采用多目标决策方法优选煤层气井完井方式,首先进行产能与经济评价,之后对累计产气量、净现值、投资回收期、内部收益率和风险系数5个评价指标进行多目标综合评价,最终可获取最佳完井方式。该评价方法应用于鄂尔多斯盆地时结果显示羽状水平井最优,直井射孔压裂完井次之,该评价结果对该区煤层气井完井方案设计具有重要的指导意义。

The completion method of CBM well has been optimized by employing multiple objective decision method,which firstly evaluates productivity and economy and then comprehensively evaluates five indexes: cumulative gas production,net present value,payback period,internal rate of return and risk factor.Application of this evaluation method to Ordos Basin shows that pinnate horizontal well is the optimal completion method,followed by fractured vertical well.The evaluation result has important guiding significance on coalbed methane well completion design.