Abstract: At present, the existing conventional oil and gas well production profile testing methods have limitations such as testing range and measuring technology,low construction success rate,and poor adaptability in coalbed methane wells. In order to make an improvement, a systematic design and development of coal-bed gas well production profile testing technology were carried out. Through the compact structure design and high integration, a set of coalbed methane logging instrument has been developed, which can simultaneously measure the temperature, pressure, magnetic positioning, thermal flow, probe gas, microwave gas, turbine flow, ultrasonic flow,and other multiple parameters. A multi-purpose one-time testing technology for single well coal bed methane production logging profile has been developed. A multi task and multi window portable ground system operation has been developed, and a new type of eccentric testing wellhead has also been developed and applied to coalbed methane well to realize continuous testing during workover. The technology was tested in three coalbed methane wells in north Shilou block, Ordos basin, the test data obtained are accurate and continuous,and the anti-interference ability are improved. The test results show that the 8^#+9^# coal seam in north Shilou block is the main gas and water producing layer.

Key words: coalbed methane, output profile testing, logging tool, eccentric testing wellhead, north Shilou block, Ordos basin