Laboratory Experiments on Forming the Chemical Composition of Flowback Brine from Hydraulic Fracturing with Energized Fluid

After the completion of hydraulic fracturing, some part of injected fluids mixed with the formation brines - so called flowback brine, migrate back through the well to the surface. Our autoclave experiments were aimed to reproduce and evaluate the chemical composition of the flowback brine derived from CO 2 -energized fluid fracturing of shale gas of the Baltic province (Poland).Results show the flowback composition is controlled mainly by the interactions between fracturing fluids and original pore water, and to a lesser extent with the reservoir rock.