Field measurements of water quality, together with an assessment of the role of thermally induced fractures, indicate that stringent fine filtration requirements are often not required for water injection wells. Corrosion and scaling of tubulars are shown in some cases to result in a bottom-hole quality worse than raw intake water. Well performance, however, is not seen to deteriorate significantly as a result. The reasons for this are examined by the inclusion of fines in models of injection well fracturing.

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