Abstract
A tertiary Alkaline-Surfactant-Polymer pilot flood was implemented during 2010 in the Illinois Basin of the United States and is continuing at this time. With initial discovery of the Bridgeport Sandstone formation in the early 1900's and over 60 years of waterflooding, the pilot was designed to demonstrate that ASP flooding could produce significant quantities of incremental oil in order to sanction a commercial project. Laboratory experiments including corefloods were done to determine the optimal chemical formulation for the pilot and to provide essential parameters for a numerical simulation model. Polymer injectivity tests, single well chemical tracer tests and an interwell tracer test program were all done to prepare for and support a full interpretation of the pilot results. A field laboratory was run through the duration of the pilot to monitor the quality the injection and production fluids, which turned out to be critical to the success of the pilot. We present the results and interpretation of the ASP pilot to date, the challenges faced during the project, and the lessons learnt from the field perspective.
