HISTORY OF NON-STATIONARY WATER FLOODING TECHNOLOGY DEVELOPMENT AT KUMKOL OIL FIELD

Abstract

In the article introduction and development stages of non-stationary waterflooding technol-ogy are considered at Kumkol oil field example. It is shown that the history of non-stationary waterflooding application at Kumkol oil field allows to determine the main trends of technology development. The application of non-stationary waterflooding begins as pilot-industrial work on a designated site. In this case, most often begin with the application of cyclics, i.e. all injection wells simultaneous discon-nection/activation of the site during the half cycle period. The analysis of the results of pilot-industrial works makes it possible to decide on the extension of the sections or on the application of non-stationary waterflooding on the entire site (oil field). In this case, the experience of managing the operation of injection wells in a batch mode without complica-tions in the reservoir pressure maintenance system is analyzed. During the time passing, the efficiency of the cyclic water injection technology starts decreas-ing, that needs using new types of non-stationary waterflooding. At the Kumkol oil field, the cyclic mode was replaced by non-stationary waterflooding + change in the direction of the filtration flow due to the selection of injection wells groups, each of which operates in its mode. However, this technology also begins «aging» with time and efficiency reduces. Further development of non-stationary waterflooding is associated with a combination of cyclic water injection and high-water-producing wells periodic operation. This direction of non-stationary waterflooding has great flexibility and can be constantly modified.