A set of equipment for pitless well drilling ensures maximum savings in disposal of drilling waste: cuttings and spent drilling fluid. Drilled cuttings with mud undergo a process of separating the solid phase from the liquid. As a result, a smaller volume of cuttings need to be disposed of, and the liquid is purified by centrifugation and returned to the circulating system. The equipment set includes additional vibrating shale shakers, tank for receiving dried cuttings, tank for receiving the liquid phase, tank for storing liquid phase and a centrifuge for cleaning the liquid phase from undesirable solids.