CO2 Foam Pilot in a West Texas Field:Design,Operation and Results

摘要

In this paper,we describe the design,implementation and results of a CO2 foam pilot in a mature CO2flood in West Texas.The objective of the pilot was to demonstrate improved conformance/sweep efficiencyof the CO2 foam over CO2 WAG injection.Laboratory experiments to guide design of the flood andthe monitoring program to understand and model flood performance are described.Monitoring includedrate and pressure tracking,injection profiles and inter-well tracer programs before and during the foamflood.While changes in injection rate and injection profile confirmed the formation of strong foam nearthe wellbore and redistribution of fluids in the injectors,oil response was weak,with significant oil gainobserved in one of the four patterns.The gas production rate also changed very slightly from the baselineconditions.The comprehensive monitoring program in this pilot provides new insights into effectivenessof CO2 foam in actual field applications.The results from this pilot may help to better screen and designfuture foam injection pilots.