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DRILLING PRESSURE ON COALBED FORMATION AND ITS DAMAGE

Huang Lei,Wang Weiying.Yangtze University of Technology,Jingzhou 434023,China  
Drilling operation in coalbed gas reservoir can also easily cause formation damage.Drilling pressure will inevitably lead to stress changes in the surrounding,Because of special physical property、special chemistry property and special pore structure,so the permeability of the coalbed seam is easier reduced than oi1 field when stress is changed or outer liquid flowed in.The article first analyzes the mechanism of drilling pressure on formation damage;then studies the effect of pressure changes in the drilling process on coal rock permeability through stress sensitivity and permeability laws experiment;at last studies the effect of drilling pressure changes on the invasion depth of solid particles through solid particles invasion experiment.
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