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据R.P.Steiger等的专利说明书(US 5205164(1993年4月))称:开发了确定稳定井眼的钻井液密度的方法。从井眼取得页岩岩屑并测量它们的特性指数,其中包括表面面积。计算了井眼周围的平均有效应力(利用原地应力中的地静上覆岩层压力、地层孔隙压力及井眼周围的总应力)。利用表面面积、平均有效应力和页岩强度间的关系式求出了原地页岩强度。利用页岩强度确定了钻井液密度。论述了确定低渗透性岩石的页岩
According to the R.P. Steiger et al. Patent specification (US 5205164 (April 1993)), a method has been developed for determining the density of a drilling fluid to stabilize a wellbore. Shale cuttings were taken from the wellbore and their characterization indices were measured, including the surface area. The average effective stress around the wellbore (using the overburden pressure in the in-situ stress, the pore pressure in the formation and the total stress around the borehole) was calculated. The shale strength in situ was determined by the relationship between surface area, average effective stress and shale strength. Shale strength was used to determine drilling fluid density. Shale that identifies low-permeability rocks is discussed