论文部分内容阅读
为兼顾生产成本与开发效果,海上稠油油田开发大多采用多层合采,层内和层间的差异对水驱开发效果影响显著,针对纵向非均质严重的问题,基于不同渗透率级差、不同平均渗透率,建立了反韵律下9种非均质物理模型,研究层内和层间非均质性对海上稠油油田水驱开发效果的影响.研究结果表明:对于层内非均质模型,渗透率级差对开发效果影响更大,平均渗透率相近时,级差越大,层内非均质性越强,注入水沿高渗透层突进,油层下部驱替效果越差,采出程度越低;层内均质层间非均质时,级差越大采出程度越低,高渗层段注入水形成优势通道抑制低渗透层吸水,高渗透层最高采收率达77.4%,低渗层采收率可低至0.7%,使油层上下部驱替效果相差较大;层内和层间都非均质时,分层开采的开发效果好于多层合采,各层采收率变化幅度与分层开采时差异较大;利用综合影响因子表征层内和层间非均质性的综合影响,其值为0.08时对应采出程度为41.48%,综合影响因子越高,纵向非均质性越强,采出程度越低.
In order to balance production cost with development effect, the development of heavy-oil offshore fields mostly adopts multi-layer and multi-layer development. The difference between layers and layers has a significant impact on the development effect of water flooding. For the problem of serious vertical heterogeneity, Different average permeability, nine kinds of heterogeneous physical models under reverse rhythm were established to study the effect of intra-layer and inter-layer heterogeneity on waterflooding development in heavy-oil offshore oilfields. The results show that for inhomogeneity When the average permeability is similar, the larger the level difference is, the greater the heterogeneity in the layer is. The injection water is advanced along the high permeability layer, and the worse the displacement effect in the lower part of the oil layer is, and the degree of recovery The higher the level difference is, the lower the degree of production is, the higher the level is, the lower the level is, the higher channel is formed by injecting water to form the dominant channel to inhibit the water absorption of the low permeable layer. The maximum recovery of the high permeable layer reaches 77.4% Seepage recovery rate can be as low as 0.7%, so that the displacement of the upper and lower reservoirs vary greatly; both layers and layers are heterogeneous, the exploitation of stratified mining is better than the multi-layer mining, all layers of recovery The rate of change is greatly different from that of stratified mining. The comprehensive impact factor is used to characterize the rate of change And the combined effects of the interlayer heterogeneity, which corresponds to a value of 0.08 when the degree of recovery was 41.48%, the combined effect of higher factor, the stronger the non-homogeneity of the longitudinal, the lower the degree of recovery.