PRE-DRILLING PRESSURE PREDICTION TECHNOLOGY AND ITS APPLICATION IN THE XIHU SAG
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摘要: 西湖凹陷普遍发育超压,钻井工程中发现,发育超压地层的钻井成本明显大于发育常压地层的井,亟需建立相关钻前压力预测技术,提高钻前压力预测精度,保障钻井安全和降低钻井成本。笔者首先对前期钻前压力预测误差大的原因进行了分析,发现压力计算参数精度低、压力计算模型不适应是导致压力预测精度低的原因,因此,在明确区域"生烃增压"成因背景下,建立了一套以高精度速度处理为基础,优选Bowers计算模型并通过经验系数校正的钻前压力预测技术。该技术在西湖凹陷取得了良好的应用效果。Abstract: Overpressure is widely developed in the Xihu Sag. The cost for a well in overpressure formation is obviously higher than that in normal pressure formation. Therefore, pre-drilling pressure prediction is a technique urgently required to enhance the accuracy of pressure forecasting, ensure drilling safety, and reduce drilling cost. After a careful review of historical cases, it is found that lower pressure calculation parameters and inappropriate calculation models are the reasons leading to the forecasting error.In this paper, a suit of new pre-drilling pressure prediction methods,such as the optimal Bowers calculation model using empirical coefficient for correction,is proposed upon the assumption that the overpressure is caused by organic process of hydrocarbon generation. The application of the methods is proven effective in the Xihu Sag.
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