出砂关停煤层气井复产潜力评价方法

    Evaluation Method of Restoring Production Potential of Sand-producing Coalbed Methane Shut-in Wells

    • 摘要: 为最大程度地开采地下煤层气资源,实现投入产出比最优化,开展出砂煤层气关停井复产潜力的研究尤为重要。综合考虑煤层气藏地质及生产特点,采用科学的量化方法对出砂关停井复产潜力进行分析,确定了关停井复产潜力评价的5个二级评价指标(钻遇地质条件、剩余供给能力、出砂情况、关停井历史生产情况及周边井生产情况)及对应的三级评价参数;优选定义了重点评价指数,并利用归一化处理的方法屏蔽了地质和区域差异对参数界限值的影响;采用层次分析法确定了各指标的权重,并最终建立了出砂煤层气关停井复产潜力量化评价模型。将该模型应用于现场出砂关停井的复产潜力评价中,并根据评价排序结果有针对性的采取复产措施,取得了良好复产效果的同时降低了复产成本。

       

      Abstract: To maximize the recovery of coal seam gas and optimize the input-output ratio, the research of restoring production potential of shut-in wells of CBM is particularly important. According to the geological and producing characteristics of coal seam gas wells, five second-order indicators were confirmed, including geological conditions, supply capacity, sand production rate, production history and production status of surrounding wells, and their corresponding third-order indicators. To exclude the geology and regionalization influences of parameters, the evaluation index was defined to normalize the parameters, and using analytic hierarchy process (AHP) to confirm the weight, and then the evaluation model of restoring production potential of shut-in wells was built. The model was applied to the shut-in wells in Surat Basin, restoring production potential order of the wells was got according to the results, and the restoring measures were made, the results showed that the restoring production was good, at the same time the cost was reduced.

       

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