Application of non-stationary waterflooding technology with a change in the direction of filtration flows in high-viscosity oil deposits.

This paper considers a section of the 7th block of the first production facility at the North Buzachi field in the Republic of Kazakhstan. This section deals with industrial experiments on the application of various non-stationary impact technologies. In 2013-2014, there was an experimental application of non-stationary waterflooding with a change in the direction of filtration flows. The paper analyses the current state of application of this technology. The results of the analysis of non-stationary waterflooding in the 7th block of the first production unit at the North Buzachi have shown that non-stationary waterflooding has a positive technological efficiency. However, there is a decreasing magnitude compared to previous periods of technology, which suggests further modifications to the non-stationary waterflooding technology used. It is shown that the application of well control (optimization) in the considered section of non-stationary waterflooding significantly affected the efficiency of non-stationary waterflooding. Wells with "optimized" operating modes have a significantly lower specific benefit (about half of the "optimized" wells have a negative benefit, compared to the same figure for the group of wells without optimization. [ABSTRACT FROM AUTHOR]