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In chemistry, pH is a measure of the concentration of hydrogen ions in an aqueous solution. pH is measured on a scale from 0 to 14. A pH of less than 7 indicates an acidic solution, while solutions above 7 are considered alkaline. A pH of 7 is neutral, as in the case of pure water.

pH analysis is fundamental to drilling fluid control. The pH of the fluid affects clay dispersion and the solubility and effectiveness of chemical additives. A change in pH while drilling often indicates contamination by substances such as cement, gypsum, or carbon dioxide. Effective corrosion control and treatment depends upon the proper pH adjustment.

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