After redesigning stimulation treatments to include hydraulic fractures with an epoxy-coated sand final stage, Texaco has achieved a two-fold increase in initial oil production from its Illinois Basin wells completed in the Salem Limestone.

Previous treatments conducted in Salem Lime wells included gelled acid with rock salt diverter, and foamed acid jobs. Initial production increases were favorable, but production declined rapidly. Acid-etch tests on Salem Lime cores showed poor conductivity gains. Twenty-seven subsequent sand fracture treatments pumped with an epoxy-coated proppant in the last stage resulted in initial production averaging 60 BOPD per well. The previous treatments averaged an initial production of 24 BOPD per well. The epoxy-coated final stage served to lock proppant in place after wells were placed on production.

This paper presents job designs and case histories showing the benefits of fracture-stimulating the Salem Limestone for production enhancement.

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