OIL-DISPLACING SURFACTANT COMPOSITION WITH CONTROLLED VISCOSITY FOR ENHANCED OIL RECOVERY FROM HEAVY OIL DEPOSITS

To improve the efficiency of waterflooding or steam stimulation, enhanced oil recovery and intensification of development a thickened oil-displacing composition NINKA-Z has been created, based on surfactants with controlled viscosity and alkalinity, which is both water-diverting and oil-displacing composition. When exposed to the reservoir with compositions NINKA-Z there is an increase in the final oil recovery by increasing the rate and factor of oil displacement, and sweep efficiency. The paper gives the results of laboratory studies of thickened oil-displacing composition for enhanced oil recovery from deposits with high temperature and for steam stimulation - solation kinetics, physical-chemical and rheological properties of the composition solutions. The composition has an adjustable viscosity and high oil-displacing ability; it retains, self-regulates in a deposit for a long time complex of colloidal-chemical properties, optimal for oil displacement purposes. In 2014-2015 pilot tests were successfully conducted of the technology to enhance oil recovery using oil-displacing thickened composition NINKA-Z on the experimental plot of Permian-Carboniferous heavy oil deposit of the Usinsky field that being developed by steam stimulation. Pilot projects have shown high efficiency of the technology, significant effects were received on increasing oil production, reduction of water cut and intensification of development. The technology is environmentally friendly and technologically efficient. The technology is promising for the industrial use in heavy oil deposits.