For decades, energised fluids containing carbon dioxide (CO2), in various formulations, have been used successfully in hydraulic fracturing and individual well soak treatments known as a Huff ’n Puff (HNP) to boost hydrocarbon recovery.
Although these energised fluids undoubtedly improve recovery, they carry the potential to also initially increase the amount of CO2 contained in the early flowback natural gas.
When this occurs to the point that CO2 concentrations exceed natural gas sales pipeline specifications, the most common practice is to flare off the gas until the concentration of CO2 within the gas reduces to acceptable levels.
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