Research on Safety Monitoring System of Bottom Hole Pressure in Coalbed Methane Underbalanced Drilling Process

ABSTRACT

During coalbed methane underbalanced drilling process, because of coal’s low mechanical strength, the coal seam can not support overburden pressure, which is likely to lead to sloughing and collapsing in coal seams; besides, as coal seams in China have low pressure and low permeability, they are prone to be contaminated. as a result, it is easy to occur various complicate situations in downhole if the bottom hole pressure exceeds the designed safety range, which threatens life and property. In the light of the coalbed methane cavity aerated underbalanced drilling, this paper puts forward a bottom hole pressure safety monitoring technology for monitoring in the coalbed methane cavity aerated underbalanced drilling, designs and develops assorted bottom hole pressure safety monitoring system that can monitor and analyze bottom hole pressure during the drilling process timely, ensures safe construction of coalbed methane underbalanced drilling, and keeps bottom hole pressure steady in real time during the coalbed methane underbalanced drilling. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

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