撬装式CO_2压注站的研制和提高采收率

Development of skid CO_2 pressurized injection plant and its application in oil recovery enhancement

苏北溱潼凹陷复杂断块油田经过二十多年的开发,面临着提高采收率的难题。根据油田地处水网地区和拥有丰富CO2的资源的特点,研制出撬装式CO2压注站。该压注站由缓冲罐、注入泵与换热器等组成,并安装在一个活动撬上,通过槽船直接将CO2运输至井场。截止2004年底,应用撬装式CO2压注站及其配套技术,已累计注入CO2量4 490t,累计增产原油10 724 t,平均换油率是每吨CO2为2.39 t油,工艺成功率100%,投入产出比1∶2.04。现场试验表明,该装置具有运输费用低、快速灵活和适应性强等优点,满足了油田提高采收率的要求。

After two decades of Jiangsu Province is confronted production, the complicated fault-block oilfield of Qintong Sag in North with difficulty of oil recovery enhancement. Based on the field＇s characteristics that it is located in water region and rich in CO2, the skid CO2 pressurized injection plant is developed. The plant is comprised of surge tank, injection pump and heat exchanger, all of them are placed on a mobile skid, and CO2 is directly transported to well site by gas carrier. After using the skid CO2 pressurized injection plant and its matching techniques, 4 490 t CO2 had been cumulatively injected, 10724 t crude oil had been cumulatively increased, the average oil draining rate by CO2 had been 2.39 ton oil for per ton CO2, its success ratio reached 100 % and the input/output ratio was 1：2.04 by the end of 2004. The field applications show that the plant has the advantages of low transportation fee, high speed, good flexibility, and good adaptability, which meet the requirements of oil recovery enhancement.