SYSTEMATIZATION OF METHODS OF WATER INJECTION IN WELLS

Abstract

Setting the required injection water rates for injection wells is a key factor for oil field successful operation using waterflooding. The success of such activities could reduce the water cyclical nature at field level, crosssection and structure; improve the ratio of water and oil and the wells cleaning efficiency; improve production and recovery of oil by channeling water to specific zones and areas and reduce material costs by improving water use. As a rule, on-site engineers adjust the fluid injection rate using heuristics. While this improves performance, we believe that a more systematic approach can be developed. In accordance with the limitations, including the available water total amount, the maximum and minimum injection rate, the maximum total production liquid for the manufacturer and the sensor installation, to determine the optimal water injection rate, based on the established distribution factor, the linear optimizer was applied programming. This approach has been experimentally tested at the Rosneft Samaraneftegaz field. The decline curve of oil production is calculated within 6 months. The results of a three-month experimental test showed that optimized oil production fits well with the historical six-month decline curve, about 22 % less than the total daily water supply, we also observed a 2 % increase over the historical two-month decline curve (also by 22 % less total daily water injection). These results show that a systematic method can ensure the optimization of target water injection rates.