Abstract: A pump system for the selected injection of one or more fluids is disclosed where the system generally includes a flow meter including a means to translate the flow rate through the meter to one or more pumps coupled to the meter such that upon a selected introduction of fluid flow through the meter a selected amount of fluid is pumped through the one or more pumps.

Abstract: A bi-center downhole drilling bit is disclosed, which bit includes a body defining proximal and distal ends, where said distal end defines a pilot and a reamer where the reamer defines a first cutting face having a selected diameter “d” and the pilot defines a second cutting face having a selected diameter less than “d”, where each the first and second cutting faces includes upsets defining proximal and distal surfaces where the distal surfaces are provided with cutting elements and the proximal surfaces are provided with one or more gauge pads.