松南气田CO_2驱油试验研究

Experimental Study on CO_2 Flooding in Songnan Gas Field

松南气田天然气CO2组分含量约为20%,不能直接排放到大气层。通过物理试验和数值模拟的方法确定好合理的参数,将分离出来的CO2注入到低渗、特低渗油藏,与地层原油形成混相,可以提高松南气田上覆腰英台油田的采收率。研究结果显示,通过物理试验和数值模拟可以很好的确定混相所需要的压力,组分等混相参数,同时可以通过模拟进行注入量和注入方式的优选。研究结果显示:CO2混相驱油,可以综合利用天然气中的CO2组分,形成CO2的零排放,同时提高低渗透油藏的采收率10%,效果显著,为解决类似问题提供了科学借鉴。

There was 20% CO2 composition containing in natural gas from Songnan Gas Field,which could not directly discharged into the atmosphere. Reasonable parameters were established by physical experiment and numerical simulation,CO2 separated from natural gas was injected into the low and ultra- permeability reservoirs,in which CO2 was mixed with crude oil to enhance the oil recovery.The study result indicates that the parameters of pressure and composition for miscible phase displacement can be effectively determined by the physical experiment and numerical simulation and at the same time the injection volume and injection mode are determined by simulation,the composition in CO2 can be integrally used for CO2 miscible displacement for a zero discharge of CO2 and 10% of the oil recovery can be raised in the low permeability reservoirs with obvious effect,it provides a new theory and method for enhanced oil revovery and a reference for solving the similar problems.