海上稠油油田多层合采层间油水渗流规律研究

Study on Interlayer Oil-Water Percolation Law of Multilayer Combined Production in Offshore Heavy Oil Fields

油水相渗规律的研究是油藏开发的关键,是油田生产预测和数值模拟分析的重要依据。海上稠油油田多层合采条件下,随着开发进行,同一储层内部和不同储层之间的油水渗流状态均有所不同。通过室内实验,研究黏度、驱替压力、储层渗透率对油水相对渗透率的影响规律,结果表明:随油相黏度增大,油水两相渗流能力降低;随驱替压力增大,两相渗流区域变宽;随储层渗透率降低,油水两相渗流能力降低。根据几种油水相对渗透率研究规律,提出生产调整和提高采收率措施建议,为海上稠油油田多层系综合开发提供技术支持。

The study of oil-water phase permeability is the key to reservoir development and the important basis for oil production prediction and numerical simulation analysis.Under the condition of multi-layer co-production in offshore heavy oil fields,the oil and water seepage states are different within the same reservoir and between different reservoirs with the development of the oil field.In this paper,the effect of viscosity,displacement pressure and reservoir permeability on oil and water relative permeability was studied through laboratory experiments.The results showed that,with the increase of oil viscosity,the seepage capacity of oil and water phase decreased;with the increase of displacement pressure,the seepage area became wider;with the decrease of reservoir permeability,the seepage capacity of oil and water phase decreased.Based on the research rules of oil and water relative permeability,some measures to adjust production and improve oil recovery were put forward.The paper can provide technical support for the comprehensive development of multilayer systems in offshore heavy oil fields.