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Drilling Construction Technology in Complex Formation for Wulanhaxia Coal Field Fire Extinguishing Engineering

CHEN Lei;WANG Jun;The Seventh Geological Brigade of Xinjiang Geology and Minerals Bureau;  
The complicated burnt rock formation in coal field firing zone is loose and fractured with fracture development,poor cementation and high formation temperature. Lost circulation,block falling and collapse are often encountered in drilling process,which lead to low construction efficiency and high cost; it is difficult to ensure the construction quality. And what are more serious are the challenges to construction technology and the people's safety under the condition of high temperature. Aiming at this,by the combination of the technology of air DTH drilling with casing and the scheme of wall protection for high temperature drilling,the construction difficulties in coal field fire extinguishing engineering are effectively solved. The construction quality is improved and the drilling cost is reduced,this valuable drilling process is developed for coalfield fire extinguishing construction.
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