随钻井间电位动态测量技术及其应用

随钻井间电位动态测量技术是一种新型的井间电阻率测量技术，其是在综合研究国内外井间地震、井间电法测量技术的基础上而提出的。该方法通过录取钻井过程中由钻杆长度变化而引起的在钻井周围各测点的动态电位数据，并结合录井时-深数据，反演得到在钻井周围各测点的纵向电阻率曲线。在对各测点纵向电阻率曲线进行横向对比后，可解决复杂断块油气田的储层连通性评价、岩性界面识别、断层界面识别等生产实际问题。现场应用14井次，在不同方向的新老井处、断层、岩性变化带等区域共实施191个测试点。通过随钻测试电阻率曲线与新老井处的标准测井中的视电阻率曲线对比，1.5 m以上砂岩储层吻合率达到95.8%、断点吻合率达到98%、储层岩性边界识别吻合率达到100%，从而证明了随钻井间电位动态测量技术的可行性。

Drilling potential of dynamic measurement technology and its application

This paper introduces a new-developed interwell monitoring technique which is able to measure the electrical potential variation dynamically during drilling. This method is proposed based on the knowledge of crosswell seismology and interwell electrical potential measuring techniques. Its purpose is to obtain resistivity curves during drilling by measuring the dynamic electrical potential variation around the borehole induced by the drilling process and time-depth information from well-logging data. After comparing the resistivity curve of each measuring point, it is able to evaluate the reservoir connectivity of oil and gas field with complex fault blocks, identify lithology and fault plane boundary, etc. This method has been used in 14 real cases with totally 191 measuring points under different conditions, for example, the ones including different orientations, fault planes, and lithology variations. Compared with the resistivity curves obtained by traditional well-logging, the ones obtained by this method show that the consistency rate reaches 95.8% for permeable sandstone reservoirs with 1.5m thickness or more; 98% for breaking points; 100% for detecting lithology of reservoir boundaries. This paper gives the principle of interwell electrical potential measurement during drilling, on-site measuring methods.