Nova

  Talk to almost any driller with a decade of field experience and they'll tell you the same thing: the problems that really cost you — the ones that shut down operations and blow up budgets — almost always trace back to the fluid. Not the bit, not the motor, not the casing. The drilling fluid. It's the element that touches every part of the well from the moment you start circulating to the moment you pull out of hole for the last time, and yet it's somehow still the thing that gets taken for granted until something goes wrong. That disconnect has always puzzled people who work closely with drilling muds. The fluid is doing an enormous amount of work downhole at any given moment. It keeps the hydrostatic pressure balanced against whatever the formation is pushing back with. It sweeps cuttings off the bit face and carries them up the annulus to the shale shakers. It coats the borehole walls so they don't cave in. It cools the bit and lubricates the string so metal isn...