Drilling and Well Completions
Chloride test :
The chloride concentration is determined by titration with silver nitrate solution. This causes the chloride to be removed from the solution as AgCl−, a white precipitate. The endpoint of the titration is detected using a potassium chromate indicator. The excess Ag present after all Cl− has been removed from solution reacts with the chromate to form Ag9CrO4, an orange-red precipitate.
Contamination with chlorides generally results from drilling salt or from a saltwater flow. Salt can enter and contaminate the mud system when salt formations are drilled and when saline formation water enters the wellbore.
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