Process for consolidating sand

Method of treating a subterranean hydrocarbon-bearing formation comprising unconsolidated or poorly consolidated particulates, by contacting the formation with a solution or a dispersion of an organosilane which is a silylated polymer of formula (I): (RO)3-nRnSi-A-B-A-Si(OR)3-nRns (I) wherein each R is independently a substituted or unsubstituted, alkyl group having from 1 to 6 carbon atoms, or a -C(O)R group where R is as hereinbefore defined; n is 0, 1 or 2; each A is a divalent organic radical; and B is a poly(oxyalkylene) linking group, a polyurethane linking group, or a poly(meth)acrylate linking group wherein the poly(oxyalkylene) linking group or the polyurethane linking group has a number average molar mass in the range of 600 to 20,000 g mol−1. The poly(meth)acrylate linking group has a number average molar mass in the range of 600 to 40,000 g mol−1.