The caliper problem occurred during the drilling in the Nanpu oilfield, due to shallow depth in the reservoir, unconsolidated formation and lower gel strength.

渤海南堡油田由于储层埋藏浅、岩性疏松、胶结强度低，在钻探过程中出现了井径扩大问题，给钻井和评价工作带来很大的困难。

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Rock strength is related to drilling parameters and features of formation rock. Formation pore pressure is an important affecting factor on rock strength.

在石油钻井施工过程中，岩石的抗钻强度主要受井下地层岩石性质的影响，地层孔隙压力则是影响岩石抗钻强度的一个重要参数。

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With the deeper drilling operation increased gradually, the triaxial compressive strength model will become one of important parameters to measure the formation strength characteristics.

深井钻井作业量的逐步增加，岩石三轴抗压强度的预测模型将成为衡量地层强度特性的重要参数之一。

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