Laboratory Evaluation of High-Temperature Conformance Polymer Systems

摘要

This paper presents the results of laboratory evaluationregarding the effectiveness of novel, organically crosslinked,high-temperature, conformance polymer gel systems assealants. Effectiveness of these sealant gels is evaluated byattempting water flow through high-permeability cores underresidual oil conditions. The effectiveness of the sealants to (1)block water permeability at temperatures up to 350°F, (2)provide long-term sealant properties at these temperatures, and(3) provide adequate gel time for placement is measured. Theultimate goal is to determine whether the selected crosslinkedpolymer systems provide useable extended gel times andmaintain thermal stability to 350°F.Discussed are (1) the physical laboratory model and testconditions used to perform dynamic core flow studies overextended periods in determining the impact of sealantexposure to elevated temperatures and subsequent requiredmodifications, (2) experimental procedure used for dynamiccore flow studies, (3) the effect of temperature on permeabilityreduction over time, (4) the impact of threshold pressure(differential pressure required before fluid flow begins througha treated core) on permeability reduction over time, (5)laboratory methodology used for gelation time measurementof a new, novel, organically crosslinked, high-temperature,conformance polymer gel system, and (6) laboratory resultsregarding gelation time of the polymer system as a function oftemperature up to 350oF.