海上普通稠油热-化学驱研究探索

Study on Thermochemical Flooding of Offshore Heavy Oil

稠油资源在世界石油资源中占有较大比例,中国海上稠油资源丰富,其高效开发具有重要意义。目前对于黏度小于350m Pa·s的普通海上稠油油藏,主要采取水驱开发。但是稠油因黏度较高,在地层中渗流阻力大,此外水油流度比大,导致水驱过程中易产生指进现象,含水快速上升,减小水驱波及从而影响最终采收率。对于海上水驱稠油油田开发过程中存在的这种问题,提出了采用热水化学驱进一步提高采收率的方法。利用油藏数值模拟方法,研究了水驱稠油油藏热水驱及采用热水/降黏剂、热水/泡沫几种不同方法提高采收率的增油机理,同时对主要影响因素进行了分析研究,发现热/化学驱技术能有效提高稠油油田采收率,明显改善了水驱稠油开发效果,对于这一类普通稠油油田的开发具有一定的指导意义。

Heavy oil resources is rich in offshore oilfields,water flooding is its main development method.So as to solve the problems caused by fluid mobility difference of oil and water in heavy oil developing process,the method of adopting thermochemical flooding was put forward.By using numerical simulation method,mechanism of 3 EOR methods were studied,including hot water flooding,hot water-viscosity reducer flooding and hot water-foam flooding.Meanwhile,the injecting parameters were also obtained.And it was pointed out that the recovery efficiency was increased significantly by thermochemical flooding,which was of significant importance to heavy oil development.