range of lost strata 地层缺失范围
lost call strata 缺失地层
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Drilling a well in the broken carbonate strata where the pressure gradient is widely different, lost circulation is an important factor that makes the rig time losed.
在压力梯度悬殊的碳酸盐岩破碎地层中钻井，井漏是损失钻机月的重要因素。
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