井间示踪监测确定水驱油藏剩余油饱和度技术应用

Application of Inter-well Tracer Test in Determining Residual Oil Saturation of the Water Flood Reservoir

长期注水开发的老油田,由于主力砂体非均质性严重、水淹程度高、剩余油分散,常规方法难以预测和评价井间高渗通道和剩余油饱和度的分布,因此开展了以示踪剂井间监测为主,与油藏数值模拟有机结合确定井间剩余油饱和度综合评价技术。阐述了井间示踪监测确定水驱油藏剩余油饱和度技术方法原理,以及这项技术在港西三区二断块注水井组的应用,并根据测试结果进行了注水井调剖、油井提液和打调整井等措施。综合调整后的生产动态表明,示踪剂测试结果和调整井测井结果及动态特征吻合,各项措施均取得明显效果,为老油田开发中后期应用井间示踪监测技术,指导三次采油的综合调整找出了一条新路。

Because the mature oilfields have a history of long-term flood development, severe inhomogeneity of main sand body and high degree of watered out and dispersed residual oil, so it is hard to predict and evaluate inter-well high-permeability channels and residual oil saturation using conventional methods. As a result, a comprehensive evaluation technology integrating inter-well tracer test and digital reservoir simulation is developed to determine inter-well residual oil saturation. The thesis introduces the theory of determining the residual oil saturation of water-flood reservoirs via inter-well tracer test and application of the technology in the water injection well group in fault block 2, Gangxi 3 area. Based on the test result, such measures are taken as profile control of well injection wells and drilling adjustment wells, etc. Performance after comprehensive adjustments indicates that tracer test result matches with adjustment well logging result and performance characteristics, and the above measures yield obvious effects, through which we have found a new way for using inter-well tracer test technology and guiding the overall system adjustment of tertiary recovery at middle and later stages of mature oilfield development.