There are a number of geological and hydrogeochemical modelling techniques that can be used in order to ascertain formation and generation of the hydrogen sulphide (H2S) in the formation fluid within a geological setting in several blocks of the Norwegian Barents Sea. Careful consideration of the H2S generation can then be used in the drilling context especially when presence of H2S is coupled Permian and Carboniferous carbonate plays prone to causing severe drilling fluid losses and increasing exposure time of the downhole equipment to the H2S. Using appropriate analogues and adequate well offset analysis tend to demonstrate that most or all of the risk factors can be well mitigated.


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