Abstract:

In order to well test methods of CBM have a more comprehensive understanding. Adopt injection pressure drop test method of open and perforated casing of coalbed methane reservoir parameters. Measured at different stages of the test well for coalbed methane reservoir parameters.Research on test wells experimental conditions of different stages.Comparison system to test the outcome of different stages of the test.The results showed that: Adopt the casing test can obtain seam parameters more real to and ensure the safety of the complex open well.Obtain the coal reservoir arameters more accurately for extend time of injection pressure drop test.Increase the perforation density and distance for can communicate effectively with the wellbore connectivity coal for the casing perforation test well.Using dual packer well test can reduce the wellbore storage, decrease wellbore distortion time.

Key words: coalbed methane, injection pressure drop method, open hole test, casing test, experimental research