Patent ID: 8714254

Claim:
A downhole mixing apparatus for mixing a first fluid with a second fluid, the downhole mixing apparatus comprising: a chamber having a first end, a second end, a first opening that allows fluid to flow into the first end of the chamber, and a second opening that allows fluid to flow into the second end of the chamber; at least one piston positioned within the chamber, wherein the piston (i) generates a seal between the first end and the second end of the chamber, (ii) is movable along the chamber towards the first end and towards the second end of the chamber, and (iii) comprises at least one agitator mixing device attached to a bottom surface of the at least one piston; and a fluid delivery system configured (i) to supply a volume of the second fluid to the chamber through the first opening and (ii) to move the piston inside the chamber so that the at least one agitator mixing device mixes the first fluid with the second fluid.