cuttings hold-down effect

Optimal flushing conditions are presented according to the results of studying various factors affecting bottom hole flushing such as strata, structure of bit, working regulation, flow field of bottom hole, cuttinghold effect, infiltration law and so on.

把反循环钻进中循环液体视为刚体 ,以力矩平衡等理论为依据 ,建立井底净化模型 ,对影响井底净化效果的各种因素如地层、钻头结构、工作规程、井底流场、压持效应和渗透规律等进行综合研究 ,推出最优净化条件 ,通过室内及野外试验进行验证。

The hydro-fractuing clastic rock is characterized by the spit of breccia,"T"vertical fracture onto the corecross section and the antitaxial feacture of sytectonic fibrous ankerite veins.

岩芯及透射光显微镜观察发现,这是一种水力破裂体系中流体和岩石作用的产物—水压碎屑岩。