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An enhanced biocide selection evaluation that extends past the traditional selection process to include stability and performance with a larger range of fracturing additives, environmental conditions, and secondary biocidal properties.
Biocides play a critical role in the exploitation of low permeability oil and gas formations via hydraulic fracturing by protecting the integrity of fracturing fluids and preventing the souring of the wells. Traditionally, biocide selection for a well is determined though a limited battery of tests used to evaluate initial biocidal activity and biocide effects on performance of the fracturing fluid. This paper presents the results of an enhanced biocide selection evaluation that extends past the traditional selection process to include stability and performance with a larger range of fracturing additives, environmental conditions, and secondary biocidal properties. Results show when using this enhanced process, a more accurate view of performance advantages and limitations of commonly used biocides emerge. In the expanded laboratory experiments, limitations with stability and performance were better elucidated with biocides such as 2,2-dibromo-3-nitrilopropionamide, glutaraldehyde, and glutaraldehyde/quaternary ammonium blends. Whereas with phosphonium polyammonium blend-based biocide, additional performance advantages were revealed. Comparative field assessments confirmed the validity and benefit of this expanded biocide evaluation for fracturing applications.
Key words: biocide, non-oxidizing, oil and gas, hydraulic fracturing, stimulation, hydrothermal stability, compatibility, oxidative breaker, phosphonium polyammonium blend, PPAB
This manuscript provides case study data from subsea crude oil pipelines that addresses the questions of how to obtain the best quality samples from pig returns for microbiological testing, and what are the relative merits of different test methodologies.
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How corrosion of steel during the initial stages of coating deterioration can be substantial—in fact corrosion rates can exceed that of boldly exposed steel. Coating selection, design assumptions and maintenance intervals are discussed.
Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.