Proppant material and its use in lithological displacement at trona-shale interface
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United States of America Patent
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Issued Date -
Dec 8, 2016
app pub date -
Dec 22, 2014
filing date -
Dec 23, 2013
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Abandoned
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Abstract
A proppant material and its use for lithological displacement of an underground evaporite mineral stratum from a non-evaporite stratum, particularly of a trona stratum from a shale stratum. A lifting hydraulic pressure greater than the overburden pressure is applied at a weak strata interface, resulting in separating the strata and forming an interface gap with a mineral free-surface. The proppant is placed inside such gap as the gap is being formed or thereafter. The proppant may comprise tailings and/or particles containing an alkali compound, such as sodium hydroxide, trona, or soda ash particles. The proppant may comprise slow-water dissolving coated particles, particularly a slow-dissolving polymeric coating over a water-soluble alkali core. After propping the interface gap, the mineral from the formed mineral free-surface is dissolved by a production solvent, thereby enlarging the gap and forming a mineral cavity. The proppant preferably dissolves or degrades in the production solvent.
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