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为了合理解释北海白垩油田遭遇的钻井失稳及地表沉降等问题 ,深入了解油田白垩的特殊性态 ,在试验研究的基础上对多相介质油田白垩的非饱和特性进行了研究 .试验结果证实了非饱和白垩具有与一般非饱和土相似的性态 ,包括水饱和度与虹吸力的关系 ,适用于非饱和白垩的应力状态变量 ,具有强度和压缩性随吸力的变化而变化的特性等 .所获成果可为油田白垩的模型研究提供参考依据 ,并对解决在石油开采过程所遇到的工程问题具有指导意义 .
In order to reasonably explain the problems such as drilling instability and surface subsidence experienced in the North Sea chalk oil field, the paper further studies the special properties of chalk in oilfields and studies the unsaturated characteristics of chalk in multiphase media oilfield on the basis of experimental studies. Unsaturated chalk has similar properties to unsaturated soils, including the relationship between water saturation and siphon force, and is suitable for the stress state variables of unsaturated chalk with the characteristics of intensity and compressibility changing with the change of suction. The results can provide a reference for the study of the chalk model of oilfields and have guiding significance in solving the engineering problems encountered in the process of petroleum exploitation.