standby vesselstanding valvestarchstarterstarting valvestatic gravimeterstatic headstatic level of the fluidstatic mixerstatic oil levelstatic spstationary barrelsteady flowsteam drivesteam soakstearatesteel platformstep bitstep faultstep v up pressurestepped crown bitstickstimulation of the productionstingerstock tankstock tank oilstone drillstop collarstop ringstop substopcockstopcocking of a wellstorage cellstraddle packerstraight hole drillingstraight pipingstraightenstraigraphic structurestrain gagestrain gage sensorstratified flowstratiform fieldstratigrapherstratigraphic columnstratigraphic geologystratigraphic holestratigraphic throwstratigraphic trapstraystray surrent corrosion