The associative polymer flooding: an experimental study

Название периодического издания
Год публикации

This study investigates the sandpack displacement of low viscosity oil (1.68 cP) by brine and aqueous solutions of associative polymers. Polymer fooding has been thoroughly investigated in many laboratory and feld tests. Polymer fooding is one of the most widely used enhanced oil recovery (EOR) methods. The method of polymer fooding is not used for development of oil felds with gas caps, fractured reservoirs, high permeability and active bottom-water drive. In the application of polymer fooding, coefcient of oil recovery is increased by 3–10%. Hydrolyzed polymers undergo the signifcant thermal and chemical degradation at high temperature and salinity. In recent years, researchers have turned their attention to associative polymers. An application of associative polymers to withstand degradation in high temperature and high salinity conditions can enhance oil recovery in high heterogeneous felds. This article presents the results of studies of oil displacement by associative polymers in a two-layer core model. In laboratory studies, the core selected from a sandy reservoir of the South Turgay Basin of the Republic of Kazakhstan was used. Solutions of the following polymers were studied: hydrolyzed polyacrylamide (HPAM) and associative polymer. The physicochemical conditions of the experiments corresponded to the reservoir conditions of the sand layer of the South Turgay Basin: temperature of 82 oC and the salinity of the brine 92,000 ppm. Experiments revealed that the associative polymer is more stable in simulated reservoir conditions than the HPAM polymer. Associative polymer fooding was recommended for pilot testing at the reservoir of the South Turgay Basin.
Conclusion. Based upon the conducted experiments, the following conclusions are drawn: 1. Associative polymer can be efective even in not very high temperature (82 oC) and high salinity (92,000 ppm). 2. Pre-fush slug’s viscosity should be considered prior the experiments. In our case, it has not worked; however, above consideration should be tested. 3. In the conditions of modeled feld 82 oC and 92,000 ppm associative polymer can raise the oil recovery for the 6.52% than waterfooding and for the 1.67% above the partially hydrolyzed polyacrylamide.
Keywords: Associative polymer fooding, enhanced oil recovery, EOR, core fooding,  polymer fooding


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