孔隙压力预测方法在油气田开发中的应用

The Application of Pore Pressure Prediction to Field Development

准确预测孔隙压力有助于评价盖层的有效性,减少井下复杂事故,实现优质、高效、安全钻井并有效保护油气层。为此,提出了预测孔隙压力的基本原理和依赖于正常压实趋势线而建立的两种预测孔隙压力的方法:即等效深度法和伊顿法,同时提出了预测孔隙压力的步骤,编制了程序,并应用此程序对某油气田几口井的孔隙压力进行了预测;在此基础上对两种预测方法的计算结果进行了对比分析,总结了在预测孔隙压力时应着重注意的问题,并提出了改进措施。

To predict accurately pore pressure is conducive to evaluating cap effectiveness,mapping hydrocarbon migration pathway,analyzing trap geometry,reducing downhole accident,carrying out a high-quality,high-effective and safe drilling,and protecting reservoir effectively.So,this paper firstly presents the basic theory to predict pore pressure and two prediction methods based on normal compaction trend curve,including equivalent depth method and Eation method;and then,it provides a procedure to predict pore pressure and develops a programme which has been applied to some wells in one field;finally,the calculations of these two methods are compared and analyzed.Moreover,some problems which should be paid attention to during prediction are summed up and some improvements are also illustrated.