POLYMER WATERFLOODING TECHNOLOGY AS A METHOD OF INCREASING OIL RECOVERY

Abstract

Oil production is divided into several stages. Primary production is carried out at the expense of energy associated with relatively high pressure in the reservoir. This reservoir energy decreases over time, and oil extraction becomes less intense. Then secondary oil production is used. This stage consists in pumping fluids into the reservoir. These include water and gas. After these stages, and with a certain time of well operation, the efficiency of oil production decreases to the extent that it becomes unprofitable. Then comes tertiary oil production. At this stage of the development of the deposit, various reagents are used, which have a special effect on the formation and, thereby, there is a significant increase in oil recovery. Polymer flooding is one example of this stage of deposit operation. The application of this method gives a significant increase in the total amount of oil raised to the surface. The increase in oil recovery occurs due to the creation of hydraulic resistance for the flow of water from the injection well to the production well in wellwashed parts of the formation. The closure of the washed zones allows water to linger in the reservoir, thereby forcing it to find new flow paths to the producing well, while at the same time dragging oil out of stagnant zones. The polymers used are usually divided into types. Each type is determined by their structure and the method of their production. They also have various properties that determine the possibility of using a particular polymer in a particular deposit. The dependences of the increase in ORF on the properties of the reservoir and fluid were analyzed when using polymer flooding at various deposits.