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Abstract Polymer flooding is the most successful chemical enhanced oil recovery (EOR) method. This technique has achieved large-scale field applications at Daqing and Shengli oilfields in China. At Daqing oilfield, polymer flooding has improved oil recovery by 10%. At Shengli field, polymer flood has contributed to more than 22 million tons of oil since 1992. The most common polymer for EOR projects is partially hydrolyzed polyacrylamide (HPAM). Since 1970s, continuous efforts have been spent on understanding the factors that influence the viscosity behavior of HPAM. It was discovered that shearing, heat, divalent ions and monovalent ions all have negative impacts on polymer viscosity. However it is still a challenge to predict the viscosity of HPAM under given reservoir conditions. The commonly used Carreau equation and Meter equation fail to consider the various factors that lead to loss of polymer viscosity. In this paper, extensive laboratory tests were conducted to measure the viscosity of HPAM solution under the influences of shearing, high temperature, Calcium concentration and sodium concentration. Based on the test data, numerical correlations are proposed to predict the power law parameters. These formulas take into consideration the various factors that affect polymer viscosity. These correlations will help to improve the prediction of polymer viscosity under reservoir conditions, and will lead to more reliable design for polymer flooding projects.
- Asia > China > Shandong Province (0.69)
- Asia > China > Heilongjiang Province > Daqing (0.45)
- Asia > China > Shandong > North China Basin > Shengtuo Field (0.99)
- Asia > China > Shandong > North China Basin > Shengli Field (0.99)
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Yian Formation (0.99)
- (2 more...)
Abstract Shengli oil field, 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 Oil Field Company (SLOF) to seek feasible enhanced oil recovery (EOR) 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 (HPAM) 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 oil field. 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.
- North America > United States > Texas > Permian Basin > Central Basin > 3000 Formation (0.99)
- Asia > China > Shandong > North China Basin > Shengtuo Field (0.99)
- Asia > China > Shandong > North China Basin > Shengli Field (0.99)
- (6 more...)