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复杂断块油藏由于层间、层内非均质性以及开发非均质性的存在,导致开发不均衡。随着开发的不断深入,层间干扰矛盾越来越突出,多次细分后再进行层系分段细分经济效益变差。减缓干扰、均衡注采、扩大水驱波及体积,是大幅度提高这类油藏水驱采收率的关键。以永安镇油田永3-1断块沙二段7—9层系为例,采用层系重组、油井分层采油、水井分层注水以及油水井变孔密射孔完井等技术,逐级减缓层间干扰,形成复杂断块油藏三级细分技术。在其先导试验区取得了较好的应用效果:单元产油量从11.5 t/d上升到54.1 t/d,综合含水率从83.4%下降到77.6%,为同类型油藏提高水驱采收率提供了新思路。
Complex faulted block reservoirs are not well-developed because of inter-layer, intra-layer heterogeneities and developmental heterogeneities. With the deepening of development, the contradiction between layers becomes more and more prominent. After many subdivisions, the subdivision of layers has become more and more inefficient. Mitigation of interference, balanced injection and production, and expanding the volume and volume of water flooding are the keys to drastically improve the waterflood recovery of these reservoirs. Taking the Yongsanzhen Oilfield Yong-3-1 fault block Sha-2 Member 7-9 layer as an example, stratified reorganization, stratified oil well production, water well stratified water injection and oil well variable hole perforation perforation completion technology, Reduce inter-layer interference, the formation of complex fault block three subdivision technology. In its pilot zone, good results were obtained: the unit oil production increased from 11.5 t / d to 54.1 t / d, the integrated water cut rate dropped from 83.4% to 77.6%, and the water flooding recovery for the same type of reservoirs increased Rate provides a new idea.