Abstract
Trials of four types of filters for application in North Sea pressure maintenance projects were carried out in the Byfjord on the west coast of Norway. A precoat filter, a dual-media filter, a backwashable cartridge filter, and a cartridge filter that uses sulfuric acid for regeneration were tested. Core flow-through tests showed that all four filters give a product water of high enough quality to prevent plugging of the highly permeable Statfjord formation. However, it was shown that some filtration was required. Filter response to operational fluctuations and contaminants differed greatly. These characteristics will affect their maintenance and efficiency in service and are therefore a part of the selection process. Considerable displacement and entrainment of formation fines occur during the flow of seawater through Statfjord cores. This phenomenon did not appear to contribute significantly to loss of permeability in this case.
Published Version
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