Patent ID: 9040467
Filing Date: 2015-05-26
Classification: C09K,Y10S

Abstract:
1. Cured, coated, discrete, free-flowing, proppant solids comprising solid proppant core particles that are substantially covered with a substantially cured coating that comprises: (a) at least one isocyanate component, (b) a hydroxy-functional polyether polyol, (c) a different polyol other than said hydroxy-functional polyether, and (d) at least one tin complex catalyst, wherein said coating forms particle-to-particle bonds under downhole conditions that exhibit an unconfined compressive strength of greater than 100 psi, that resists proppant flowback at elevated temperature and pressure, and that further exhibits a negative TMA slope within the range of about 125° C. and 175° C., wherein said coated proppants exhibit a loss of coating of less than 15 wt % when tested according to ISO 13503-5:2006(E), wherein the different polyol comprises one or more of decarboxylated cashew nut oil, castor oil, cardol and cardanol.