Investigation of Nano-particle in reduction of polymer adsorption on rock surface during reservoir flooding and reduction of optimum injected polymer concentration toward reservoir with an environmental approach

Today's the mostly of oil reservoirs specially Iranian south-west oil reservoirs due to production from these reservoirs are at their second half of life. Water or gas injection at secondary enhanced oil recovery (EOR) in order to stabilize or reduction of pressure depletion it will no longer be responsible for reducing production. Therefore, tertiary EOR methods are used to prevent the loss of production. One of the tertiary EOR methods is using chemical injections. Injection of chemicals into oil reservoirs is used to increase the viscosity of the injected fluid, to reduce the interfacial tension between the injected fluid and the fluid produced, as well as to change the wettability of the reservoir rock. One of these chemicals, which is mainly used in relatively high permeability reservoirs, is polymers that are used to increase the viscosity of the injected fluid and also increase the mobility ratio of the reservoir fluids. This leads to the relatively piston sweeping of the produced fluid in the reservoir and also the postponement of the moment to reach the breakthrough time. One of the main challenges in the injection of polymers into oil reservoirs is the absorption of these polymers on the reservoir rock, which in addition to reducing the polymer's effectiveness in the entire injection region, also increases the cost of injection. Therefore, in this study, the effect of nanoparticles in order to reduce the adsorption of polymers on the reservoir and therefore the less polymer needed to achieve a specific production in the reservoir and, consequently, to reduce the environmental damage in order to produce polymers and also to inject them into oil reservoirs have been dealt with. The results show a decrease in polymer adsorption by the nanoparticles studied.