Shell U.K. Exploration and Production (Shell Expro) operates in the U.K. sector of the North Sea on behalf of Shell/Esso and other joint venturers.

This paper discusses operational problems experienced to date, in Shell Expro's fields, due to the formation of barium and strontium sulphate scales downhole in producing wells. Particular reference is made to the Shell/Esso Brent and Dunlin Fields.

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