利用测井资料预报井底以下未钻开地层的孔隙压力与破裂压力

USING LOGS TO PREDICT PORE-PRESSURE AND FRACTURE-PRESSURE OF UNDRILLED FORMATION

介绍使用已钻开井段的测井数据，预报井底以下未钻开地层孔隙压力和破裂压力的方法。该方法经过12口井，19井次预报，已经DST和Leak off试验证实孔隙压力预报成功率为90.91%；破裂压力成功率为96.15%。此技术不依赖邻井的有无与距离远近，因此除海洋钻井外，还适用于陆上钻井。该方法对安全钻进和降低钻探成本有着不容忽视的作用。

This paper introduces a method to predict by using log data of penetrated intervals. This method has been use in 12 wells for 19 predictions, proved by DST and Leak-off test to be 90. 91% success for pore pressore and 96. 15% succes for fracture pressure. This technique is not dependent on the distance of adjacent wells, thus it is applicable to both onshore and offshore drilling. It is useful for safety practice of drilling oprations, and for reducing drilling costs.