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AssigneeDow Global Technologies LLC
InventorsPraveen Agarwal, Yifan Dong, Arjun Raghuraman, Aayush Shah, Juan Carlos Medina, Kshitish Patankar, Mark F. Sonnenschein
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Coated proppant particles are prepared from a coating composition that includes at least one polyisocyanate and an isocyanate trimerization catalyst. The coating composition preferably is devoid of an effective amount of a urethane, urea and carbodiimide catalyst. The coating composition cures rapidly at moderate temperatures, and bonds to itself well under conditions of heat and pressure as are experienced by the particles in subterranean formations.
A method for forming a coated proppant, comprising applying a coating composition to the surface of solid substrate particles, wherein the solid substrate particles are thermally stable to a temperature of at least 100° C., wherein the coating composition comprises at least one polyisocyanate and an isocyanate trimerization catalyst, and curing the coating composition at an elevated temperature for a period of up to 10 minutes on the surface of the substrate particles to form a solid polymeric coating at the surface of the solid substrate particles, thereby forming the coated proppant.
A coated proppant particle comprising a substrate particle having a polymeric coating that weighs 0.1 to 10 weight percent of the weight of the substrate particle, wherein the polymeric coating is a polyisocyanurate polymer that contains no more than 10 mole-% urethane, urea and/or carbodiimide linkages.
Dependencies are inferred from the claim text.