对于极端高压地层，即使不流动，也可能存在井眼稳定性问题。
An extremely high-pressure formation, even if not flowing, may have wellbore stability problems.
如何控制陆相地层横向不稳定性，是盆地分析的难点。
The difficulty for analysing basin sedimentation is how to control the horizontal variation of continental strata.
此外，野猫井的井壁稳定性一般凭经验判断，所以复杂地层的井壁失稳事故在所难免。
In addition, the stability of wildcat well is generally determined by experience, so the disaster at complex formations is unable to avoid.
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