Desert Rigs 66 Sandmaster self-propelled rig • A free standing mast – no guy lines. • All wheel drive. • A B.O.P./wellhead handling system – integral with the substructure. • No rig ramp is required. • Levelling and alignment problems are eliminated through use of the free standing mast and integral substructure. • Safe and easy rig-up. National Oilwell is a leader in the desert with several “firsts” in rig design and desert moving systems such as our Sandmaster rigs. Sandmasters are successfully operating in the desert of North Africa. The rigs boast the following features: • An integral substructure – open on three sides. • An integral hydraulic system – no hydraulic hoses have to be disconnected including hydraulic B.O.P. lines. • An integral mud pump – mounted on the carrier deck. • Both the accumulator and choke manifold are mounted on the carrier deck. Modular and self-propelled rigs make moving easy to desert drilling sites.