shut in formation pressureshut off valveshutting in of the holeside door casing elevatorside door elevatorside scan sonarside tracked holeside trackingsidetracksignaling pigsiluriansimplex cementing collarsimultaneous drillingsingle acting pumpsingle anchor leg mooringsingle anchor leg mooring systemsingle core barrelsingle drum hoistsingle faultsingle point buoy mooring systemsingle point mooringsingle point mooring buoysingle shot inclinometersinker barsix point bitsizing pigskidskid v the derrickskin effectskin factorskirtslack jointslack waxslag cementslant hole drillingslant rigslateslide valveslightly dipping fieldslim holeslim hole casingslim hole core barrelslim hole drillingslim hole well completionslingslip faultslip jointslip joint safety valveslip socketslip type core catcher