NEW WATERFLOODING EFFICIENCY EVALUATION METHOD (ON THE EXAMPLE OF 9th HORIZON OF THE GUNESHLI FIELD)

Abstract

The purpose of the research in the article is to develop a method for evaluating the efficiency of the water injection process. For this purpose, a number of computer studies are carried out. In view of this, a computer simulation of water injection process is applied. Using oil parameters from IX horizon of Guneshli field as PVT-properties of oil in reservoir conditions, the process of oil displacement by water injection in various technological modes is studied, the correlation between the injection rate and the amount of incremental oil production is determined. For this purpose the process of oil displacement in a hypothetical field is modeled on the basis of the idea of «enlarged well» at different injection rates, such as 10, 20, 30, 40, 50, 60, 70. and 75 m3/day. Water injection is carried out in the area of external reservoir boundary. In addition, the reservoir development process in the depletion regime is predicted for comparison. In both cases, the formation radius is considered as a circular layer equivalent to the real layer. Analysis of the obtained results determines the criteria for minimizing economic risks during water injection process. It is shown that at low rates of water injection, the numerical value of this parameter decreases with an increase of water volume injected per day. However, after a certain value of the injection rate, the efficiency factor increases with an increase of the water injected volume per day. Keywords: Displacement; Waterflooding; Waterflooding efficiency; Enlarged well.