深部煤岩防塌钻井液密度的计算OA北大核心CSTPCD
受煤阶和地应力的双重影响,深部地层煤岩井壁失稳可能与其自身岩石力学性质有关.在这种情况下,由于煤层气含量大小对煤岩变形破坏及力学响应的作用和弹性力学自身的缺陷,防塌钻井液密度的计算会产生误差.研究表明,这种误差跟游离气和吸附气的双重影响有关,往往受孔隙流体压力大小的控制,压力越大,影响越明显.在深部高孔隙流体压力地层环境下,这种影响不容忽略.文中采用经典混合物理论的本构建模方法,揭示了含气煤总应力与孔隙压力、孔隙率、气体的等温吸附特征、固相煤骨架…查看全部>>
Affected by coal rank and earth stress, caving of coal rock may be associated with rock mechanics properties. By means of the effect of CBM content to coal rock deformation and mechanical response and the defects of elasticity, it leads an error in calculating caving prevention drilling fluid density. Researches show that this error is caused by both free and adsorbed gas, and it has proportional relationship with pore fluid pressure, which greater pore flui…查看全部>>
陈奕廷;康毅力
油气藏地质及开发工程国家重点实验室·西南石油大学,成都油气藏地质及开发工程国家重点实验室·西南石油大学,成都
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煤层气井钻井液密度井眼稳定孔隙流体压力
Coal bedDrilling fluidDensityBorehole stabilityPore-fluid pressure
《钻井液与完井液》 2012 (1)
1-4,4
973计划课题“深井复杂地层漏失与井壁稳定机理预测”(2010CB226705)资助.
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