Study On The Feasibility Of Produced Water Reinjection

Produced water contains large amounts of suspended solids, oil, salt and a variety of refractory organic matter, without dealing with foreign will cause serious environmental pollution and waste of water, so the best way to treat it is return to Reservoir.But the water re-injection, due to which the suspended matter, oil content will plug formation, scaling ions in the water reservoir deposition in porous media pore throat clogging, so,there is a strict standard of water quality to regulate it. With our oil field injection water quality standards to improve the level of oilfield development and water treatment technology, facilities, technology development, changing into water quality standards on a higher requirement, it can meet the formation requirements, while maintaining the ground water treatment process and construction costs.Therefore, each field in determining the reservoir water quality standards, reservoirs and water should be based on the characteristics of the reservoir water through the experimental study of the degree of injury, make the water suitable for the oil index, combining with the water injection experiments to further verify the site to finalize a reasonable injection water quality indicators I.Dagang oil field development for the coastal wetlands of oil production wastewater generated during oil pollution reduction goals, Dagang Oilfield of China Petroleum based, to carry out oil waste water efflux upgrade wastewater treatment technologies and alternative water re-injection oil extraction technology research To form a cost-effective emission reduction technology system to deal with pollutants, in order to reduce the harm to the environment waste water, waste water utilization to achieve the provision of technical support.This paper combines the Dagang oil field geological characteristics of the block where the, the feasibility of reinjection about the treated water was study with method of expansion, the weight of law, core flow experiments and so on to ensure the treated water was returned to stratum. The results showed that, when the suspended solids, oil content of control in10mg/L or less, to the core of the damage rate can be controlled below20%, and when water reinjection, you can not consider the impact of COD on the injection of; while residual water demulsifier added1227pairs of little influence of core damage. The current process after the injection of water quality was good; water reinjection must be taken into account the feasibility of clay swelling, scaling, and the amount of suspended solids in water, oil content on the rate of core damage; and oilfield produced water to replace water Back to the injection formation is feasible.