Schoal of Energy,China University of Geosciences (Beiing) Long Gas Technology Company Ltd.

结合储层参数,以实际生产数据为基础分析煤层气井的抽采特征,从产气潜能、构造位置、钻完井工艺及抽采制度等方面对产能影响因素进行分析。研究表明:产气潜能、水平井煤层段进尺与产气量呈正相关关系,可根据产气潜能、煤层段进尺预测水平井的产气量。构造位置不同的煤层气井抽采特征明显不同,位于构造高点的煤层气井的初期抽采效果好于构造低点的煤层气井。采用清水钻进及欠平衡钻井工艺可降低储层污染;采用高套压、低液位的抽采工艺可实现连续、稳定地抽采。

Based on the actual production data and in combination with the reservoir parameters,the gas drainage features and the influence factors of the coalbed methane well were analyzed,and from the gas productivity,structure location,well drilling and completion technique,gas drainage system and others,the factors influence d to the gas production capacity were analyzed. The study showed that the gas productivitydrilling distance of the horizontal gas well in the seam section and the gas p roduction were in a positive correlation relationship and according to the gas productivity and the drilling distance in the seam section,the gas production of the horizont al well could be predicted.The gas drainage features of the coalbed methane well in different structure locations would be different obviously,and the initial gas drainage effect of the coalbed methane well in the high point of the structure would be better than the coalbed methane well in the low point of the structure. The clean water drill ing and the under-balanced drilling technology were applied to reduce the pollution of the reservoir.The gas drainage technology with a high casing pressure and low liq uid level was applied to realize the continuous and stable gas drainage.

国家科技重大专项资助项目(2011ZX05034-001,2009ZX05038-002-01)；中央高校基本科研业务费专项资金资助项目(2011YXL052)；国家重点基础研究发展计划(973计划)资助项目(2009CB219604)；国家自然科学基金资助项目(41272175)；