views of an exemplary casing pipe and air injector collar of the present invention interior drill pipe 25 is not shown in fig2 or 5 to better illustrate the path through which the air gas or other fluid flows drill pipe 25 is shown in fig7 9 the air flows down from the surface through air transmission pipe 35 to the transitional section 16 around stop valve 14 that is pushed open by the pressure of the incoming air through the inlet 15 into the plenum 13 the air pressure equalizes inside plenum 13 and is expelled evenly into the interior area 12 through the plurality of openings 19 from there the air mixes with the upflowing column of mud and debris creating a lighter mixture from that point upward reducing the overall weight of the column in use the collar 8 of the present invention is attached to a drill casing segment 22 and inserted into the drill hole pipes 35 are inserted into the hole along with drill casing segments 22 until the desired location for the collar is reached drilling operations then occur with drill pipe 25 extending down the center of casing 22 mud is pumped downward inside pipe 25 until it reaches.