塔河油田缝洞型碳酸盐岩油藏气窜后剩余油分布及差异化动用方法

RESIDUAL OIL DISTRIBUTION AND DIFFERENTIAL DEVELOPMENT AFTER GAS CHANNELING OF PALEO-CAVE RESERVOIR IN TAHE OILFIELD

为改善塔河油田缝洞型碳酸盐岩油藏气窜治理效果,综合地球物理、地质、生产动态等多来源数据,室内物理模拟同矿场实践相结合,对气窜后剩余油分布特征、气水协同注入机理及不同类型剩余油的差异化动用进行研究。揭示了缝洞型碳酸盐岩油藏气水协同机理为:注入气因密度差异进入储集体顶部,纵向驱替顶部剩余油至水驱通道,注入水再将通道内的剩余油驱替至生产井。根据注入方式及动用目标剩余油的差异,提出4种气水协同注入模式:常规协同模式、换向协同模式、栅状协同模式和调剖协同模式。矿场应用显示,利用该模式对气窜后剩余油进行差异化动用,效果显著。为同类型油藏开发提供了借鉴。

In order to improve the effect of gas channeling control in Tahe paleo-cave carbonate reservoir, the distribution characteristics of residual oil after gas channeling, the mechanism of gas-water co-injection and the differential development of different types of residual oil were studied based on geophysical, geological and production performance data and field practice. The mechanism of gas-water co-injection in paleo-cave carbonate reservoir is revealed as follows: injected gas enters the top of reservoir due to density difference, displaces remaining oil in the top to water drive channel,and injects water to drive remaining oil in the channel to production wells. According to the difference of injection mode and target remaining oil, four modes of gas-water co-injection are proposed: conventional co-injection mode, reversal co-injection mode, grid co-injection mode and profile control co-injection mode. Field application shows that using this model to differentiate the remaining oil after gas channeling has a remarkable effect. It provides a reference for the development of similar reservoirs.