Polymer compositions for well killing operation in fractured reservoirs

Abstract

This article describes the results of physical, chemical and rheological properties of the frame and gel forming compositions, which are crosslinked systems prepared based on soluble silicates. The aim of this work is to increase the well killing efficiency during well service operations in the conditions of fractured carbonate reservoirs, high gas-oil ratio and abnormally low reservoir pressure. The technology of well killing during well service operation involves sequential injection into the well. The considered compositions showed that they could be used in conditions of reservoir temperatures from 20°C to 90°C, which consists in the possibility of injection these compositions into a typical well and selling them into the bottom-hole formation zone due to their low viscosity after preparation and slow cross-linking speed. Laboratory tests showed the high efficiency of the use of blocking polymer compositions, and opened new directions for further research, namely, the need for a cycle of laboratory and field tests of the considered compositions, which will allow us to choose and justify the optimal technological and economic parameters of the operation. The results can be applied to increase the well killing efficiency of oil and gas wells in complicated conditions during well service operations.