冻胶泡沫体系堵水效果分析

ANALYSIS ON WATER SHUT OFF EFFECTS OF GEL FOAM SYSTEM

火烧山油田储层裂缝极为发育，基质渗透率极低，属于特低渗的裂缝性油藏。油田注水开发时间不长， 由于储层存在大量裂缝，油藏纵向和平面非均质性非常严重，导致注入水沿高渗透层或裂缝发育地带突进，油井含水上升速度很快，已进入高含水开发期。堵水调剖技术通过封堵高渗水窜层段，较好地调整注水剖面，扩大注入水波及体积，从而有效改善水驱状况，提高水驱效率。用堵水技术控制油井含水率，关键在于分析油层注采关系，对区块油、水井进行整体堵调，有效加强低渗透层注水，控制高渗透层水窜，从整体上改善区块的注水开发效果。综合分析H3层H1304井历次堵水效果得出，对其相应注水井调剖后堵水效果较好，采用冻胶泡沫体系堵水比较有效，可以改善地层油水渗流状态，堵水有效期较长。由于每口油井油藏地质特征都不同，所以H3层其他油井同期堵水效果不尽相同。

Reservoirs in Huoshaoshan Oilfield develop many fractures, with low matrix permeability, being low- permeable fractured reservoirs. The oilfield has not experienced a long period of water flooding. Many fractures ex- isting in reservoirs and vertical and areal reservoir heterogeneity cause injected water breakthrough along high-per- meable horizons or fracture development zones, with water cut in producers increasing rapidly and oilfield entering high water-cut stage. The technique of water shut off and profile modification better adjusts water injection profile by plugging high-permeable water breakthrough interval and increases sweep volume so as to improve water flooding condition and enhance the efficiency of water flooding. Water shut off technique to control water-cut ratio of produc- er is focused on analyzing injection-production relationship of reservoirs, performing shut off and profile modification for producers and injectors in the whole block and improving water injection of low permeable reservoir and control- ling water breakthrough in low permeable reservoirs. Analysis on water shut off of Layer H3 of Well H1304 shows that gel foam system is effective, which can improve oil and water flow condition, with a long effectiveness period. Since each well has different reservoir geologic features, other wells in Layer H3 has different effect of water shut off in the same period.