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.
而随钻井眼稳定性评价，由于其实时性，能够及时反映井眼情况，从而，得到越来越多的重视。
More and more importance is attracted to the wellbore stability evaluation while drilling, because it can reveal the wellbore status real-time.
并将建立的模型应用于某地区的岩石力学参数及井眼稳定性评价中，现场应用取得了很好的效果。
The model is applied in evaluation of rock mechanics and wellbore stability in some areas, and it wins a good effect.
进而通过对椭圆形井眼周围岩石应力分布的分析，对不同岩性的地层确定了不同的井眼稳定性条件。
By analyzing the rock stress state around the elliptic borehole, the stability conditions are established for different types of formation.
西江24—3—A14大位移井的摩阻与扭矩、井眼稳定性及井眼清洁是钻井成功与否的关键因素。
Wellbore stability, hole cleaning, toque and drag are key factors in extended reach well drilling of Xijiang 24 - 3 - A14.
岩石力学参数是随钻井眼稳定性评价的基础参数，所以，建立岩石力学参数随钻评价模型，成为此项工作的核心。
And rock mechanical parameters are essential to the wellbore stability evaluation, so developing the model of rock mechanical parameters evaluation while drilling becomes core of the work.
文中利用能量法，研究了等曲率井眼中钻柱的稳定性问题。
In this paper, the problem about stability of the drill stem in the borehole with iso-curvature is studied by use of energy method.
井眼基本破坏形式是由于不稳定性造成的井眼岩石崩落坍塌和剪切带。
The basic failure mode of borehole is borehole avalanche and shear zone caused by bore instability.
通过优选建立了等效地层电导率变误差迭代搜索方法，提高了井眼环境校正的精度和稳定性。
A technique of variable-error iterative searching solution for equivalent formation conductivity is developed. The accuracy and stability of borehole correction are improved.
同时研究了不同参数对裂缝扩张和井壁稳定的影响，为正确认识裂缝井眼的稳定性提供了科学依据。
At the same time, we studied that the different parameters how to affect the crack extending and wellbore stability. Thus this paper offered the scientific foundation for correct under...
同时研究了不同参数对裂缝扩张和井壁稳定的影响，为正确认识裂缝井眼的稳定性提供了科学依据。
At the same time, we studied that the different parameters how to affect the crack extending and wellbore stability. Thus this paper offered the scientific foundation for correct under...
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