Unlocking gas from tight sands

Without hydraulic fracturing, most tight-sand gas reservoirs would not produce economically even at the relatively high levels wellhead gas prices have reached recently in the US.The concept of hydraulic fracturing is simple. Fluid pumped down the well and into the formation creates fractures that allow gas or oil to flow into the wellbore at rates higher than would be possible without the procedure. The pumped fluid often includes proppants, such as sand, that ensure that the mechanically created fracture remains open.Operators have used variants of this technology for decades for accelerating oil and gas production as well as for recovering previously uneconomic resources.One problem in...

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