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Enhanced Oil Recovery by Improved Waterflooding. Final Report

机译：通过改进的水驱提高采收率。总结报告

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Although the Storms Pool Improved Waterflood project was terminated before a complete evaluation of the technical success or failure was possible, the following conclusions can be drawn: (1) Numerous reservoirs in the Illinois Basin are technically suitable for polymer flooding. (2) In the Storms Pool Pilot, no benefit would be gained from the resistance factor of polyacrylamide polymers. Polysaccharides or polyacrylamides could be used to achieve a favorable mobility ratio for the flood. (3) The susceptibility of polysaccharides to microbial degradation was determined to be less difficult to deal with than the shear and salt sensitivities of polyacrylamides. (4) Biopolymer broth (Flocon 1035 and Flocon 4800) could be shipped by truck over long distances without detectable changes in broth quality if adequate, minor precautions were taken. (5) Dilute polysaccharide injection could be accomplished within established laboratory and microbiological quality control limits. Water quality was a major problem which was difficult to alleviate without the installation of a completely new filtration system. (6) Suitable measures were taken to maintain the integrity of the pilot area, i.e., to minimize drift, eliminate any gas cap, and assure no fluid movements into or out of the pilot area. (7) Polymer injection substantially improved the injection profile compared with the profile prior to polymer injection. (8) Although the previously experienced decline rate was slowed, this could have been a result of either polymer response or improved operations and monitoring. No evidence of polymer breakthrough was detected in the production wells. (9) The project was abandoned for economic reasons before an explanation of the apparent technical failure could be formulated. 4 figures, 4 tables. (ERA citation 09:015918)

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