Direct chemical injection systems and methods

A system comprising:

• a mainline flow meter operable to measure a flowrate of fluid flowing through a recirculation line;
• an inlet line leading from the recirculation line into a mixing chamber comprising a plurality of vertically stacked mixing zones;
• a chemical injection port on the inlet line operable to inject a chemical into fluid flowing through the inlet line to form a chemical-infused fluid;
• wherein the inlet line extends downwardly into the mixing chamber to deliver the chemical-infused fluid to a lower mixing zone of the plurality of vertically stacked mixing zones;
• wherein the mixing chamber blends the chemical-infused fluid received from the inlet line;
• and
• wherein the blended chemical-infused fluid flows from the mixing chamber into the recirculation line.

A system comprising:

• an injection system operable to inject a chemical into a drilling fluid at a variable dosage rate to form a chemical-infused fluid;
• a mixing chamber operable to receive the chemical-infused fluid;
• a means for blending the chemical-infused fluid within the mixing chamber to form a blended chemical-infused fluid;
• a recirculation line operable to receive the blended chemical-infused fluid, the recirculation line operatively coupled to an oilfield operation;
• and
• a programmable logic controller (PLC) operable to vary the dosage rate based, at least in part, on a real-time flow rate of fluid within the recirculation line.