Slim Hole Drilling Technology for Parameter Well of Coalbed Methane

In order to reduce the cost in drilling, China United Coalbed Methane Corporation adopts slim hole drilling technology to drill parameter wells. In this paper, key parts of this technology are introduced, which includes selections of surface equipment, drill string, drilling parameter and drilling fluid, maintenance of drilling fluid, control measures of solid content, deviation prevention, coring technology, and logging technology. These techniques are successfully applied in the Qingshan project in Baotian, Guizhuo Province, which only cost less than half of what may cost in conventional oil and gas well drilling. According to the above discussion, a conclusion can be reached that slim hole drilling is feasible for the drilling of parameter well.