The Barents Sea of the Norwegian Continental Shelf: drilling through carbonates, modelling, risk management and well planning

• Published in: IOP Conference Series: Materials Science and Engineering
• Main Authors: Mosesyan, M A, Hartwig, A, Edin, K M, Rabey, A S, Surguchev, L M
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2019
• Subjects: Barents Sea
• Online Access: http://dx.doi.org/10.1088/1757-899x/700/1/012048; https://iopscience.iop.org/article/10.1088/1757-899X/700/1/012048/pdf; https://iopscience.iop.org/article/10.1088/1757-899X/700/1/012048

Abstract There are a number of geological and hydrogeochemical modelling techniques used in order to ascertain formation of the hydrogen sulphide (H 2 S) in the formation fluid within a geological setting in several blocks of the Norwegian Barents Sea. Careful consideration of the regional and chemical factors causing H 2 S generation can also be used in the drilling context. Thermochemical sulphate reduction (TSR) is the most likely process of H2S formation in this setting. Risk picture becomes different when presence of H2S is closely coupled with occurrence of Permian and Carboniferous carbonate plays prone to causing severe drilling fluid losses and increasing exposure time of the downhole equipment to the H 2 S. Using appropriate analogues and adequate well offset analysis tend to demonstrate that most of the risk factors can be well mitigated.