The Utilization of the Microflora Indigenous to and Present in Oil-Bearing Formations to Selectively Plug the More Porous Zones Thereby Increasing Oil Recovery During Waterflooding Page: 2 of 5
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ELEVENTH QUARTERLY PROGRESS REPORT
The objective of this work is to demonstrate the use of indigenous microbes as a method of profile control in
waterfloods. It is expected that as the microbial population is induced to increase, that the expanded biomass will
selectively block the more permeable zones of the reservoir thereby forcing injection water to flow through the less
permeable zones which will result in improved sweep efficiency.
This increase in microbial population will be accomplished by injecting a nutrient solution into four
injectors. Four other injectors will act as control wells. During Phase I, two wells will be cored through the zone of
interest. The core will be subjected to special core analyses in order to arrive at the optimum nutrient formulation.
During Phase II, nutrient injection will begin, the results monitored, and adjustments to the nutrient composition
made, if necessary. Phase II also will include the drilling of three wells for post-mortem core analysis. Phase III
will focus on technology transfer of the results. It should be pointed out that one expected outcome of this new
technology will be a prolongation of economical waterflooding operations, i.e. economical oil recovery should
continue for much longer periods in the producing wells subjected to this selective plugging technique. Results from
work under DOE Contract No. DE-AC22-90BC14665 will be incorporated as appropriate.
SUMMARY OF TECHNICAL PROGRESS
Phase I. Planning and Analysis
The concepts for the new technology to be evaluated in this project are scientifically sound and have been
proven to be effective in laboratory experiments. Nevertheless, it is necessary to perform laboratory tests on live
cores from the reservoir of interest. Two wells will be drilled for this purpose and special core analyses will be
conducted in order to fine tune the exact concentration of, and schedule for, additions of nutrients to the injection
While the main purpose for drilling the two wells is to obtain cores suitable for use in the laboratory work, a
secondary purpose is to obtain production data which will indicate the sweep efficiency of the existing waterflood. At
the conclusion of Phase I, a specific feeding regime will have been formulated for each of the injection wells. Since
the injection wells all vary in terms of years of service, differences in channeling are anticipated and a different
feeding regime may be needed for each well.
The work for Phase I of the project has been divided into seven tasks as described below.
Task 1.1: The Drilling of Two New Injection Wells for the Acquisition of Cores and Other Data.
Task 1.2: On-Site Handling of Cores
Task 1.3: Core Analysis to Determine MEOR Requirements
Task 1.4: Microbial Analyses of Cores
Task 1.5: Laboratory Waterflooding Test of Live Cores
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Brown, Lewis R. & Vadie, Alex A. The Utilization of the Microflora Indigenous to and Present in Oil-Bearing Formations to Selectively Plug the More Porous Zones Thereby Increasing Oil Recovery During Waterflooding, report, October 20, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc627758/m1/2/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.