Development of Low-Permeability Reservoirs by Increasing the Mobility of Water in a Porous Medium Using a Chemical Reagent - Super Fluid Water SFW

Abstract

The considered "Super Fluid Water" (SFW) is developed aqueous solution of polyelectrolytes with extra low concentration. The aim of the present work is laboratory investigations and field studies of the water with reagent flow in porous media. Change in hydrodynamics of water flow – the mobility increase was observed for the SFW additives. Filtration studies of changes in the value of the residual resistance factor for core samples with different permeability were carried out. The conducting field tests were held using standard techniques and methods of field geological and geophysical studies. Temperature and profile logging were performed at different flow rates, with water and water with SFW injection (SWF concentration up to 1%). Laboratory studies have shown that the value of the residual resistance factor is lower than the value of the absolute permeability of the core sample, and the dependence is approximated by the power function. The established laboratory dependence confirmed the possibility of using the SFW reagent for conformance control in injection wells, which determined the goals and objectives of field studies. The field studies were performed (we provide the information about the success treatments of 4 injection wells, no information about the unsuccessful treatments) and showed that the use of the reagent SFW leads to a dramatic increase of the injection capacity of the wells (210% and more). Estimation of the injection capacity profile before and after the use of SFW reagent showed the extension of operating intervals by including of extra low permeable layers (less than 1-2 mD) not previously drained by water. At the same time, the efficiency of SFW technology in these conditions is estimated to be higher than the technologies associated with gas injection into the reservoir. The achieved results allow us to assert the prospects of using SFW technology for the development of low-permeable reservoirs. The employment of this technology in the practice of oil recovery engineering will increase the efficiency of field development and oil recovery by 15-20%.