蜀南地区高煤阶煤层气生产潜力研究

Study on productive potentiality of coal-bed gas in south of Sichuan Province

评估煤层气井的生产潜力是实现经济效益开发的关键环节。以蜀南地区投产时间大于3年的煤层气井排采资料为基础,运用数值模拟等方法分析地质、工程因素对气井产能的影响,指出地质因素中含气量、煤层厚度、地解压差、渗透率和工程因素中压裂施工排量、加砂量、施工曲线形态7个指标共同主导着产量的走势;在此基础上,运用灰色关联分析和模糊数学评判法量化各指标对产能的影响程度,并用双因素法对气井进行分类,预测了该区气井生产潜力,得到的结果与生产动态吻合性高。

Based on the depletion information of coalbed methane wells,this paper indicated that determinant factors which dominated the production tendency of CBM were the controlled reserve,desorption capacity,the permeability,displacement,sand volumn and curve shape of hydrofracture through analyzing how the geological and engineering factors affect coalbed methane wells productivity. Based on the above research,influence degree of each factors was quantified by grey correlation analysis and fuzzy mathematic methods. What＇ s more,the well was classificated by using double factor method and the result was identical to actual production data.