早期注聚对不同韵律储层剩余油及开发特征的影响——以锦州Z油田行列井网为例

为了明晰海上油田不同韵律储层早期注聚后剩余油的分布及开发特征,参照锦州Z油田特征参数和实际注采井网,开展了不同韵律条件下水驱油和聚驱油三维物理模拟实验。结果表明:相对于水驱开发,正韵律、反韵律和复合韵律储层通过实施早期注聚,前期采油速度分别提高3.6倍、2.7倍和2.4倍,高含水末期采出程度分别提高1.8倍、1.5倍和1.4倍,采收率分别提高21.5百分点、18.9百分点和18.2百分点。正韵律聚驱后剩余油富集在储层顶部采油井间非主流线区域,可部署水平井进行挖潜;反韵律和复合韵律聚驱后剩余油分布在采油井排驱替介质未波及区域,可部署定向调整井进行挖潜。研究结果可以为海上同类油田的开发及调整起到借鉴作用。

Effect of polymer flooding in early stage on residual oil and development characteristics of reservoirs with different rhythm:a case study of line well pattern in Jinzhou Z oilfield

In order to clarify the distribution of remaining oil and the influence of development characteristics after polymer flooding in early stage in different rhythm reservoirs of offshore oilfield,according to the characteristic parameters and actual well pattern of Jinzhou Z oilfield,three-dimensional physical simulation experiments of water flooding and polymer flooding with different rhythm were carried out.The experimental results show that compared with water flooding development mode,the recovery rate in positive rhythm,reverse rhythm and compound rhythm reservoirs can be increased by 3.6 times,2.7 times and 2.4 times respectively,the recovery degree at the end of high water cut is increased by 1.8 times,1.5 times and 1.4 times respectively,and the ultimate oil recovery is increased by 21.5%,18.9%and 18.2%respectively;after polymer flooding in early stage,the remaining oil is enriched in the non-mainstream line area between the production wells at the top of the positive rhythm reservoir,and horizontal wells can be drilled for potential development.The remaining oil is distributed in the area between the production wells where displacement medium affected weakly in the reverse rhythm and compound rhythm reservoir,and directional adjustment wells can be drilled for potential development.The results can be used for reference in the development and adjustment of similar offshore oilfields.