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通过对延长气田地层岩心进行矿物组份和理化性能以及声波时差、密度、电阻率等测井数据分析得出,延长气田地层属于属硬脆性泥页岩地层,内部微裂缝比较发育,结合安全钻井液密度窗口计算结果得出,适当的提高钻井液的密度和封堵性,可减缓了钻井液沿微裂缝向地层的侵入,钻井液液柱压力可以长时间的保持对井壁的有效支撑,防止井壁坍塌。
According to the logging data analysis of mineral components, physical and chemical properties, acoustic time difference, density and resistivity in the core of Yanchang gas field, it is concluded that the Yanchang gas field belongs to the hard brittle shale formation with relatively developed internal microfractures. Combined with the safe drilling Liquid density window calculated results, the appropriate increase in drilling fluid density and sealing, can slow down the drilling fluid along the micro-cracks into the formation of invasion, drilling fluid column pressure can be maintained for a long time the effective support of the well wall, To prevent the collapse of the shaft wall.