A packer fluid is a fluid left in the casing tubing annulus when completing a well. The purpose of the fluid is to help balance pressures on the tubing and casing strings by providing a hydrostatic pressure on the static side of the tubular goods. The fluid may be either water-based or oil-based. Regardless of the type of fluid used, there are several common properties required for adequate performance. The principal requirement of a packer fluid is stability. A packer fluid will be left static for long periods of time between workover operations. A fluid which solidifies or allows all the solids to settle on top of the packer will significantly increase the maintenance well costs. A good packer fluid will inhibit corrosion of the tubular goods either through oil wetting, as with oil-based muds, or by the use of appropriate corrosion inhibitors. The fluid should be non-damaging to the formation in the event of a packer leak or other downhole communication between the annulus and the wellbore. The fluid should also be of sufficient density to properly balance the anticipated pressures. Several fluids have been found which meet these requirements.
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