The subsurface treatment of oil, gas, and water wells for control of corrosion, scale, bacteria, paraffin and a variety of other problems is a common practice in the oil industry. While a major concern is the evaluation of how a chemical performs its intended function, often a much more basic dilemma exists - "How is the chemical transported?" and, "Does it arrive at its intended destination?" The work reported in this paper addresses these questions as well as basic background concerning subsurface corrosion and scale deposition.

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