In the oil & gas industry, polyacrylamide water-in-oil emulsions are used as additives in fracking and drilling applications. In fracking, large volumes of fracturing fluid are injected into formations at high pressure to fracture rock formations (shale, sandstone, limestone, etc.) and in this way the crude oil and/or natural gas is released from the borehole. In hydraulic fracturing applications, high-molecular-weight anionic and cationic polyacrylamides are used as dampening agents, where the hydrated polymers suppress turbulence present in water with high velocity gradients. Since hydraulic fracturing is performed at very high injection rates, the decrease in pumping pressure due to rejection will result in reduced pump power consumption, so the use of effective reducers in fracturing fluids can significantly reduce operating costs.

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