井下人工地震驱油技术在复杂断块油藏的应用

复杂断块油藏受平面、层间、层内矛盾的影响，剩余油难以驱动，高含水阶段水驱效果逐渐变差。井下人工地震波的波前可激发岩石颗粒产生超声波，含有天然气的地层流体在其空化作用下产生大量气泡，可以增加驱动能量，降低原油黏度，减弱岩石孔隙中阻碍原油流动的水锁效应、气阻效应及毛管末端效应，增强原油流动性。井下人工地震驱油技术在黄骅坳陷枣园油田枣北孔一段复杂断块稠油油藏的现场应用表明：该技术能够改善高含水阶段的水驱效果，人工地震期间区块产量自然递减显著下降，投入产出比为1：7．58，作用范围大，对油藏伤害小，是具有广阔应用前景的三次采油技术。图3参5

The application of downhole seismic in driving complex fault block reservoirs

In the high watercut stage, complex fault block reservoirs are influenced by areal, inlayer and interlayer heterogeneities. Oil remains in the reservoir and the oil-water displacement efficiency gradually decreases. The wave front can inspire ultrasonic in the reservoir and generate large amount of air bubbles in the formation fluid dissolved with natural gas to increase drive energy. Downhole seism technique can decrease oil viscosity, weaken water locking, gas blocking as well as capillary end effect in rock pores and increase crude oil mobility. Field application in Kong 1 formation, Zaoyuan Oilfield, proves that downhole seismic is an effective way to improve the waterflood efficiency, and the natural decline in the process decreased obviously. The input output ratio of the program is 1:7.58. The downhole seismic technique influences large domain and does little harm to the reservoir. The application of this technique will make complex fault block reservoir development more economic and effective.