Autonomous chemical treatment system and method for drilling and completion rigs

An autonomous chemical treatment method for making a completion fluid, the method comprising:

• adding a fluid comprising seawater and industrial water to a fluid supply tank in a chemical treatment system;
• adjusting a pH of the fluid in the fluid supply tank by slowly adding a caustic soda solution until the pH reaches 8-9;
• filtering the fluid in an absolute filtration unit comprising 2 micrometer cartridges;
• adding 0.053% v/v of glutaraldehyde 40% 3 hours before a scheduled pumping time;
• and
• adding, one or more liquid products immediately prior to the scheduled time for pumping, the one or more liquid products comprising 0.045% v/v of sodium bisulfite 40%, 3.5% potassium chloride, sodium chloride, 0.20% v/v of emulsion preventer, and 10% v/v of scale inhibitor, to prevent premature decomposition of these products.