Recent Successes: MEOR Using Synergistic H2S Prevention and Increased Oil Recovery Systems

Recent Successes: MEOR Using Synergistic H2S Prevention and Increased Oil Recovery Systems Donald O. Hitzman; Donald O. Hitzman Geo-Microbial Technologies GMT Search for other works by this author on: This Site Google Scholar Michael Dennis; Michael Dennis The LATA Group Search for other works by this author on: This Site Google Scholar Daniel C. Hitzman Daniel C. Hitzman Geo-Microbial Technologies GMT Search for other works by this author on: This Site Google Scholar Paper presented at the SPE/DOE Symposium on Improved Oil Recovery, Tulsa, Oklahoma, April 2004. Paper Number: SPE-89453-MS https://doi.org/10.2118/89453-MS Published: April 17 2004 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Hitzman, Donald O., Dennis, Michael, and Daniel C. Hitzman. "Recent Successes: MEOR Using Synergistic H2S Prevention and Increased Oil Recovery Systems." Paper presented at the SPE/DOE Symposium on Improved Oil Recovery, Tulsa, Oklahoma, April 2004. doi: https://doi.org/10.2118/89453-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Improved Oil Recovery Conference Search Advanced Search AbstractContemporary investigations of Microbial Enhanced Oil Recovery (MEOR) technologies began in earnest in the 1980's. Since then, numerous programs have examined the reliability of the concepts, processes, and technical efficacy of recovery biosystems. Despite reported successes, MEOR technologies have not been widely accepted by the oil and gas industry as a means to recover residual oil. The Bio-Competitive Exclusion (BCX) biological process has successfully demonstrated significant oil recovery results in mature waterfloods from the deliberate alteration of indigenous reservoir microflora to an anaerobic denitrifying bacteria (DNB) population through the use of nitrate-based formulae as alternate electron acceptors and microbial nutrient. These environmentally safe inorganic salts complement the naturally occurring volatile fatty acids (VFA) in the reservoir and produced waters, selectively stimulating and increasing the targeted DNB. This designed and controlled manipulation of an indigenous DNB population initiates and increases the production of multiple gas, solvent, and surfactant bio-products which have known and demonstrable oil recovery properties. The BCX technology offers a feasible, practical, and very cost effective, tertiary oil recovery system that concurrently controls reservoir and surface system souring. Field data from California, Oklahoma, China, and Canada are presented.IntroductionDuring its history, the petroleum industry has accumulated a large body of knowledge and evidence of indigenous microbial populations in oil and gas reservoirs and producing systems.1 It is well established and undisputed that certain bacteria - namely sulfate reducing bacteria (SRB) - are extremely harmful to production operations. The logical response has been to attempt the eradication of the detrimental microflora by applying a wide range of biocides.It is only in recent years that biological technology innovations and new evidence of favorable economics and effectiveness have enabled industry to reconsider its approach to existing in-situ microbial populations. It is now known that microbial consortia activity is a potentially powerful process that can profoundly and beneficially affect the entire reservoir, production volumes, and related production system infrastructure.The old axiom that microorganisms cannot significantly influence reservoirs has been disproved by the progressive biogenic sulfide contamination of massive reservoirs and production facilities. Souring, hydrogen sulfide (H2S) corrosion, iron sulfide plugging, related financial costs and the threat to worker health and safety has been well documented throughout the global industry. Prolific SRB growth and activity best illustrates the potential for microorganisms to quickly affect entire systems, no matter the size, and validates the potential for an alternate, beneficial replacement microbial community to exert a very large positive effect within an observable and acceptable timeframe.As a method that exploits this potential, the BCX process targets beneficial indigenous microbial species and deliberately manipulates the entire reservoir microflora to release trapped oil in commercial quantities, as well as permanently inhibit the production of sulfide by SRB.This oil-releasing/sulfide-destroying biological system has proven its effectiveness in the field and is initiated and sustained by the injection of low cost nutrient products, first introduced to industry as Max-Well 2000. The BCX system functions in-situ, perpetually stimulating targeted indigenous de-nitrifying microorganisms (DNB) to produce chemical and physical oil-releasing agents. It is literally a gas and chemical "factory" that is situated within the reservoir, where its effectiveness is optimized.2 Keywords: recovery, oil recovery, corrosion, recovery system, biocide, effectiveness, souring, microbial method, enhanced oil recovery, srb Subjects: Improved and Enhanced Recovery, Microbial methods This content is only available via PDF. 2004. Society of Petroleum Engineers You can access this article if you purchase or spend a download.

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