Biocide Drilling and Completion chemicals are used as suitable additives for drilling jobs. These are also used as auxiliary agent for chemicals, as oilfield chemicals and also as petroleum additives. These are soluble in water and these have ph value that ranges between 9 to 12. Known for its low toxin content, these biocides act as broad spectrum mildew biocides and antiseptic factors. These are slightly alkaline by nature and are suitable for alkali prone environment. Biocide Drilling and Completion chemicals are applied by using impact infusion or continuous drip infusion method. These chemicals need to be stored in well ventilated area which is away from moisture.