wellbore collapse 井壁坍塌
Thus reducing acid concentration or the fluid volume will be benefit for rock structure protection, preventing formation collapse and particle migration in near - wellbore region after acidizing.
降低酸液浓度和用量有利于保护岩石骨架，避免近井眼岩石酸化后造成孔隙坍塌和加速微粒运移。
When the stress of wellbore is close to critical loads, wellbore is in the state of instability, and when dynamic disturbance is present, wellbore will collapse because of in…
提出当井壁孔隙压力接近临界值时，井壁处于非稳定平衡状态，在有动力扰动的情况下，井壁因失稳而坍塌。
In the drilling process, the collapse of wellbore wall is severe in the Cretaceous and Jurassic strata.
在钻井施工中，白垩系、侏罗系地层井壁失稳严重。
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