This paper discusses further the application of Blast Furnace Slag (BFS) in the cementing of oil and gas wells, with particular emphasis being placed on the suitability of BFS for offshore operations in the North Sea. The paper outlines the chemical reactions which occur during curing of BFS and discusses effects of different BFS sources and testing requirements. The application of BFS as a drilling fluid additive to improve cement bonding by solidification of the filter cake is discussed with respect to the effects of BFS on drilling fluid rheology and fluid loss. BFS is found suitable for low volume operations such as plug cementing, however wider use BFS is seen to be limited by logistics and occupational safety aspects for offshore North Sea applications. The environmental benefits to be gained by use of BFS is limited.

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