is present the small bubbles are imploded the relatively large amount of gas present in the liquid in my invention see fig2 however preserves the bubbles as microbubbles fig1 c is adapted from fig1 of hudson u s pat no 6 627 784 one of the patents incorporated in its entirety by reference fig1 c shows a cavitation device differing slightly from the cavitation device of fig1 a and 1 b in fig1 c drilling mud liquid in conduit 60 is mixed with gas usually air from conduit 61 the gas immediately becomes dispersed in the form of bubbles 62 in conduit 63 which is split in two parts to enter the cavitation device at opposite sides of the rotor 64 which is mounted on shaft 70 as illustrated for the similar cavitation device in fig1 a and 1 b the fluid enters clearance 65 and becomes subjected to the cavitation action imparted by passage of the bubble containing drilling mud between rotating rotor 64 containing cavities 68 and housing 66 the gas immediately is broken into small bubbles which are formed into evenly dispersed microbubbles in the drilling mud 69 before it exits through conduit 67 the cavitation device should be run at maximum design speed for maximum tip speed more cavitation is better for mixing the microbubbles will be substantially uniform in size if the flow rates of the liquid and gas are maintained substantially constant the triplex or other charge or rig pump will need a certain charge pressure that is up to 150 psi and then will pump the fluid to an order of magnitude higher pressure typically the circulating.