Design of the key instruments for automatic monitoring and control of production in CBM well

In the process of promoting automatic production of CBM(coalbed methane) well, dynamic liquid level, gas production rate and water production rate are difficult to measure accurately. In order to solve these problems, the automatic liquid level tester is designed, improving significantly the measurement precision of the dynamic fluid level in CBM wells. Field verification showed that the deviation was less than 2 meters. In combination with the low gas production, the regulating valve with small plug was improved, and the fine control of gas production was realized. The device for CBM well water metering is designed referring to the manual measurement method, and the error is less than 3 percent. This equipment meets the demand of production site, provides the basic guarantee for automatic production of CBM well.