Curable resins have been used to coat onto proppant for controlling proppant flowback after hydraulic fracturing treatments as well as in screenless, frac-pack completions. As more wells are drilled into deeper reservoirs, severe conditions including high temperatures and high production flow rates impose more constraint requirements on the use of curable resin systems. This paper presents the results of an extensive study, including both laboratory and field testing, of a new liquid resin coating system that is particularly useful in controlling proppant flowback in high-temperature, high-flow rate wells. Additives included in the liquid resin system can eliminate fracturing fluid interference and permit good consolidation properties to be achieved without any formation closure stress.

Results of this work demonstrate the difficulty in designing fracturing treatments such that the curing of resin does not occur too fast relative to fracture treatment time and the time for formation closure to achieve good consolidation, but fast enough to prevent flowback upon fluid recovery operations. The useful window for resin-coated proppants has been greatly expanded by the incorporation of simple chemical additives into the resin that react with fracturing fluids, rendering them noninterfering to the consolidation process. These additives permit resin-coated proppant to achieve good consolidation properties without closure stress.

This study provides new answers as to why resin precoated proppant (RCP) consolidations sometimes fail in the field. Operators can use the information presented to help them select the appropriate curable resin systems for their applications where consolidations are expected to withstand production conditions of high temperatures, high flow rates, and stress loading.

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