但后两者都是影响井壁应力分布和岩石力学性能而造成井壁不稳定。
The last two factors induce borehole instability both by affecting stress distribution around wellbore and material properties of rock.
井壁不稳定问题已严重制约着新站地区的钻井作业，并带来了很大的经济损失。
And the drilling operations in Xinzhan area have been influenced by unstable borehole walls, and economic loss is heavy.
着重探讨了煤层并壁不稳定机理，结果表明，煤层井壁不稳定是物理、化学、力学与机械等因素的综合效应。
The result shows that coal seam wellbore unstability is a synthetic effect caused by such factors as physics, chemistry, mechanics and machinery.
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