渤海稀油油田多层合采层间干扰室内实验研究

Laboratory Experiment on Interlayer Interference of Multi-layer Commingling Production of Light Oil in the Bohai Thin Oilfield

渤海中深层薄互层油藏多层合采开发过程中,由于其原油黏度低以及地层渗透率级差大的特性存在,出现了与稠油油藏多层合采特征不一样的层间干扰问题。为了更清楚地认识稀油油藏多层合采层间干扰规律,合理制定生产制度,文章统计了该油田地层孔、渗数据,采用不同渗透率的长岩心进行双管并联恒速驱替实验,对实验条件下单采与合采的驱替特征开展研究。实验结果表明,不同渗透率岩心水驱油时含水上升规律相似,但与稠油规律截然不同;渗透率级差越大,层间干扰越严重;从渗流机理上明确渗透率级差对层间干扰的影响规律,为层系划分及调整提供理论依据。

Due to low viscosity of crude oil and large permeability difference of reservoir,the interlayer interference problem during multi-layer commingling production in thin bedded light oil reservoirs is different from that of heavy oil reservoir.In order to understand the law of this problem and the production strategy can be reasonably formulated,the reservoir porosity and permeability data were made statistic analysis,and the displacement characteristics of single and commingling production under experimental conditions were studied by using two-tube parallel constant-speed displacement experiments with long cores with different permeabilities.The experimental results show that the increasing trend of water content during the displacement of oil by water in cores with different permeabilities is similar,but different from that of heavy oil.The greater the permeability difference,the more serious the interlayer interference.From the seepage mechanism,the influence law of permeability difference on interlayer interference is clarified,providing the theoretical foundation for the dividing and adjustment of reservoir.