School of Metallurgical Engineering,Xi'an University of Architecture and Technology Research Institute of
Geology,Xi'an Research Institute Company Limited,China Coal Technology and Engineering Group

为了得到煤储层参数,采用注入/压降试井法对裸眼、套管、套管内射孔、压裂等不同完井方式下的煤储层参数进行了对比试验与分析。结果表明:在井筒稳定情况下,应首选裸眼井试井方式;在井筒稳定性较差的情况下,应采用套管内测试,而套管内射孔后注入/压降测试次之;裸眼井测试结果能够更加准确地反映煤储层特征,压裂测试结果可以直接指导煤层气井初期的排采工作;套管内射孔后测试由于受到固井、射孔等工序的影响,测试结果没有裸眼井和压裂井测试结果准确;套管内试井应该延长测试时间和注入压力等可控因素,从而获得更加可靠的测试结果。

In order to get the reservoir parameters,an injection and pressure drop method was applied to the comparison tests and analysis on the coal reservoir para meters under the open hole,casing,perforation in casing,different stage after the fracturing and other different well completion type.The results showed that under the stabl e condition of the well hole,an open hole type well test method should be applied.Under a quite poor stability condition of the well hole an inner casing test would be applie d and the injection and pressure drop test would be conducted after the perforation in casing.The open hole type well test results could more accurately reflect the coal res ervoir features and the fracturing test results could directly guide the initial drainage and extraction work of the coalbed methane well.After the perforation in the casing,due the tests influenced by the well cementation,perforation and other procedure,the test results would not be accurate to the test results of the open well and fracturing well.Th e well test in casing should expand the test time ,injection pressure and other controlled factors in order to have more reliable test results.

国家科技重大专项资助项目(2011ZX05040-003)；中国煤炭科工集团科技创新基金资助项目(2013ZD008,2013QN006,2014MS007)；