纵向非均质性对海上稠油油田水驱油开发效果的影响研究

发布时间：2019-02-22 13:44

【摘要】：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.
[Abstract]:In order to give consideration to production cost and development effect, multi-layer combined production is mostly used in offshore heavy oil field development. The difference between layers and layers has a significant effect on the development effect of water drive. Aiming at the serious problem of longitudinal heterogeneity, the difference of permeability is based on the difference of permeability. Nine kinds of heterogeneous physical models with different average permeability were established to study the effect of intra- and inter-layer heterogeneity on the water drive development of offshore heavy oil fields. The results show that the permeability difference has more influence on the development effect for the heterogeneity model in the layer. When the average permeability is close, the greater the gradient difference, the stronger the heterogeneity in the layer, and the worse the displacement effect of the lower part of the reservoir is, when the injected water penetrates along the high permeability layer, and the effect of displacement in the lower part of the reservoir is worse. The lower the degree of extraction; In the case of heterogeneity between homogeneous layers, the greater the gradation difference is, the lower the recovery degree is. The injection of water in the high permeability zone forms an advantage channel to inhibit the water absorption of the low permeability layer, the highest recovery factor of the high permeability layer is 77.4%, and the recovery rate of the low permeability layer can be as low as 0. 7%. The displacement effect of the upper and lower parts of the reservoir is different greatly. The development effect of stratified mining is better than that of multi-layer combined mining, and the variation range of recovery efficiency of each layer is different from that of stratified mining. The comprehensive influence of intra-layer and inter-layer heterogeneity is characterized by comprehensive influence factor. When its value is 0.08, the extraction degree is 41.48. The higher the comprehensive influence factor is, the stronger the longitudinal heterogeneity is and the lower the recovery degree is.
【作者单位】：东北石油大学提高油气采收率教育部重点实验室;中海石油(中国)有限公司天津分公司;中海油能源发展股份有限公司工程技术分公司;
【基金】：国家重大专项子课题(2011ZX05024-002)
【分类号】：TE53

【相似文献】