基于等值渗流阻力的非均质油藏水驱前缘计算——以非洲R油田为例

Calculation of Water Flooding Front of Heterogeneous Reservoir Based on Equivalent Flowing Resistance——Taking R Oilfield as An Example in Africa

为了明确注水开发油藏注水井水驱前缘的推进状况,本文以非洲R区块油藏为例,基于油水两相等值渗流阻力理论,在考虑储层纵向非均质性基础上,建立了反九点井网水驱前缘计算模型,以区块内两口单向注水受益井为例,选取同一时间步,计算水驱前缘推进距离为215～439m。利用油藏数值模拟软件,在历史拟合计算上计算水驱前缘推进距离在300～450m,两种计算结果接近且与生产实际吻合,表明该计算方法可靠。研究成果对预测油井见水时间、及时开展井网及注采剖面调整具有重要作用,对同类油田的开发有一定的借鉴意义。

In order to clarify the advance condition of water flooding front in water flooding reservoir, this paper took the R block reservoir in Africa as an example. Based on Equivalent Flowing Resistance, a calculation model of water flooding front for reverse nine point well pattern was established on the basis of vertical heterogeneity of reservoirs. The calculation results were compared with the numerical simulation and production dynamic practice, which shows that the calculation method is reliable. The research results play an important role in predicting well water breakthrough time and timely adjustment of well pattern and injection production profile. It has certain reference significance for the development of the same kind of oilfield.