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我国煤层气井渗透率测试方法目前广泛采用注入/压降试井。通过对试验井的裸眼测试和套管测试发现,套管测试渗透率是裸眼测试的9.82倍,裸眼测试渗透率明显偏低。裸眼测试渗透率低的主要原因是注入和关井时间较短,未出现径向流。由于我国煤层气区块大多处于勘探阶段,且多采用裸眼注入/压降方法,开展区块裸眼和套管注入/压降的对比测试,可以获取区块标准井的注入时间和关井时间,提高渗透率解释结果的准确性。
Currently, CBM well permeability test methods are widely used in injection / pressure drop well test. Through the naked eye test and casing test on the test well, it is found that the casing test permeability is 9.82 times that of the naked eye test, and the permeability of the naked eye test is obviously lower. The main reason for the low penetration rate of naked eye test is the short injection and shut-in time and no radial flow. Since most CBM blocks in China are in the exploration stage and the naked eye injection / pressure drop method is mostly adopted to carry out comparative tests on injection / pressure drop of the naked eye and casing in the block, the injection time and shut-in time of the standard well can be obtained. Increase permeability to explain the accuracy of the results.