煤层气三孔双渗试井分析方法技术研究

Technical Study on CBM Three-Hole Double Permeability Well Test Analysis

我国煤储层普遍具有低含气饱和度、低渗透率、低储层压力和低资源丰度等"四低"特点,煤层气测试获取资料的解释理论与试采结果的符合率较低。针对以上问题,开展煤层气试井与常规试井的异同点分析与评价,找出煤层气试井难点,结合煤层气地质特征,开展煤层气试井方法的适应性研究,探索适合煤层气的试井工艺;开展了影响煤层气试井因素的综合分析、研究,提出试井参数优化方法及操作规程,确保取准合格的煤层气试井资料;提出了适用于煤层气的三孔双渗试井解释模型和解释方法,提高了资料处理解释的准确率。

China's coal reservoir has ' four low' characteristics of low gas saturation,low permeability,low reservoir pressure and low abundance of resources,and the coincidence rate of interpretation theory for data obtained from coal-bed methane test to test results is low. In view of the above problems,the analysis and evaluation of differences and similarities between coal-bed methane well test and conventional test has been developed to find out the problems of coal-bed methane well test,and combined with the geological characteristics of coalbed methane,study on adaptability of coal-bed methane well test method is launched to explore the test process suiting for CBM. The comprehensive analysis of influence factors to CBM test has been developed to propose the optimization method and operation rules of well test parameters in order to ensure acquiring qualified well testing data of the coal bed methane. It is put forward for CBM threehole Double Permeability well test interpretation model and method,which improves the accuracy of data processing and interpretation.