While drilling , drilling fluid is pumped down the inside of the drill string .
While drilling , drilling fluid is pushes the drill cuttings up the annulus to the surface , where the cuttings are removed from the drilling fluid ( drilling mud ) by the shale shakers .
While drilling , drilling fluid is pumped down the inside of the drill string and pushes the drill cuttings up the annulus to the surface , where the cuttings are removed from the drilling fluid ( drilling mud ) by the shale shakers .