AU1149495
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  • 软件语言:简体中文 
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  • 文件大小: M
  • 软件地址: AU1149495    迅雷高速下载     
详细介绍
A system for drilling low rate coalbed formations wherein the formation has anisotropic fracture characteristics which create low permeability (high volatile B bituminous rank or lower). Typically these coalbeds have vitrinite reflectance less than 0.78 Ro. The system includes drilling and completing these formation with a horizontal borehole that is drilled with a gas turbine in an underbalanced pressure condition relative to the pressure of the formation. The horizontal borehole is drilled substantially transverse to the general direction of face cleats within the coalbed.
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