Abstract
Shengli Oilfield, located in Northeast China, is one of the largest and oldest oilfields in China. The field production peaked in 1991 and the overall water cut has reached 95 % in 2012. The decline in production and the increasing demand for fossil energy have motivated the Shengli Oilfield Company (SLOF) to seek feasible enhanced oil recovery methods. Since 1992, more than 60 units at Shengli field have received injection of polymer or a combination of polymer and low-concentration surfactants. Partially hydrolyzed polyacrylamide and petroleum sulfonate were chosen for most polymer flood projects. Field cases demonstrated that polymer flood and surfactant-polymer flood could effectively increase oil rate, decrease water cut and improve oil recovery. This paper reviews several unique field trials at Shengli Oilfield. The earlier polymer flood projects targeted relatively ideal reservoirs with low temperature and low water salinity. However the undergoing polymer flood projects and future projects have to face very challenging reservoir conditions. Loss of polymer viscosity and reservoir heterogeneity affect the success of polymer flood projects. Future research at SLOF will focus on developing more tolerant polymers and improving the flow of polymer in reservoirs.
Highlights
Shengli Oilfield, discovered in 1961, is mainly located in the Shandong province in Northeast China
Hydrolyzed polyacrylamide and petroleum sulfonate were chosen for most polymer flood projects
Loss of polymer viscosity and reservoir heterogeneity affect the success of polymer flood projects
Summary
Shengli Oilfield, discovered in 1961, is mainly located in the Shandong province in Northeast China. The field is divided into 11 smaller fields, namely Shengcai, Dongxin, Xianhe, Gudao, Gudong etc. The annual field production peaked at 33.55 million tons in 1991. The production declines to around 27 million tons per year in 2012, while the overall water cut at Shengli Oilfield has reached 95 %. The company management realized the field has to rely on enhanced oil recovery (EOR) methods to battle decline and prolong the field’s productivity. China’s thirst for energy has pressurized the company to seek feasible technologies that enhance oil production
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