Proppant

A method of forming a proppant for hydraulically fracturing a subterranean formation, wherein the proppant comprises a particle and a hybrid coating disposed about the particle, said method comprising the steps of:

• A. providing the particle;
• B. providing an isocyanate component;
• C. providing an alkali metal silicate solution comprising water and an alkali metal silicate;
• D. combining the isocyanate component and the alkali metal silicate solution to react and form the hybrid coating;
• and
• E. coating the particle with the hybrid coating to form the proppant;
• wherein the particle is present in an amount of from about 90 to about 99.5 percent by weight based on the total weight of the proppant and the hybrid coating is present in an amount of from about 0.5 to about 10 percent by weight based on the total weight of the proppant.

A method of hydraulically fracturing a subterranean formation which defines a subsurface reservoir with a mixture comprising a carrier fluid and a proppant comprising:

• A. a particle present in an amount of from about 90 to about 99.5 percent by weight based on the total weight of the proppant;
• and
• B. a hybrid coating disposed about the particle and present in an amount of from about 0.5 to about 10 percent by weight based on the total weight of the proppant, the hybrid coating comprising the reaction product of:
• (i) an isocyanate component;
• and
• (ii) an alkali metal silicate solution comprising water and sodium silicate;
• said method comprising the step of pumping the mixture into the subsurface reservoir to fracture the subterranean formation.