Abstract
This chapter focuses on the selection of completion and workover fluids and tests for potential formation damage by completion fluids packer fluids and casing. Various brines are used as completion or workover fluids. The density of brine is adjusted by altering the concentration of the salt or salts in solution. Because these salts are soluble in the water, calculation of brine composition is not straightforward. Ground calcium carbonate is commonly used as a bridging agent in acid-soluble and biodegradable systems. It is completely soluble in acid, and is available in a wide range of particle sizes. A completion and workover fluid has recently been introduced that uses sized grains of sodium chloride as bridging and weighting agents. The grains are suspended in saturated brine by a polymer and a dispersant. The complexities of formation damage make it difficult to formulate a non-damaging completion fluid unless extensive laboratory testing is carried out. Such testing necessarily involves considerable expense, both in cutting a core and in the laboratory time involved.
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