CURABLE CROSS-LINKABLE COMPOSITION FOR USE AS LOST CIRCULATION MATERIAL

摘要

The present invention relates to compositions and methods for reducing or preventing the loss of drilling fluids and other well servicing fluids into a subterranean formation during drilling or construction of boreholes in said formation. Specifically, this invention comprises a curable cross-linkable composition capable of free radical polymerization for creating lost circulation material. The curable cross-linkable composition comprises a mixture of: (i) an organic compound capable of free radical (co)polymerization represented by the formula (I): wherein x is an integer from 2 to 8; L is a moiety comprising an aromatic or an aliphatic group derived from an diisocyanate; Fp1 is a moiety derived from an organic compound with a reactive group and one or more free radical polymerizable group; and Qi is a moiety derived from an organic polyol comprising two or more hydroxyl groups having a molecular weight of from 400 to 4,000 and (ii) a reactive diluent described by the following formula (II): wherein: y is an integer from 2 to 8; Fp2 is a moiety derived from an organic compound with a reactive group which may be the same or different than Fp1 and Q2 comprises a moiety derived from an organic polyol comprising two or more hydroxyl groups having a molecular weight of from 60 to 500.