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Downhole Decomposition of Biocide Dazomet and Implications in the Delayed Onset of Hydrogen Sulfide in Hot Shale Gas ProductionNormal access

Authors: J.J. Marrugo Hernandez, R. Prinsloo and R. Marriott
Event name: First EAGE/IFPEN Conference on Sulfur Risk Management in Exploration and Production
Session: Challenges And Approaches To Production Of Conventional And Unconventional Reservoirs With H2S
Publication date: 18 September 2018
DOI: 10.3997/2214-4609.201802760
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 304.4Kb )
Price: € 20

The unexpected presence of H2S in hot shale gas was previously attributed to Sulfur-reducing bacteria contamination. However, in recent years we have shown how sulfur containing chemical additives, used during the hydraulic fracturing procedures, could readily decompose and/or react under high-temperature and pressure (downhole conditions), producing H2S along with organosulfur compounds. In this abstract, we present evidence of the delayed souring of shale gas caused by Dazomet (commonly used biocide) which undergoes several reactions that leads to H2S and methyl thiol, exemplifying a case in which a chemical additive has the potential to sour hot shale gas production.

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