A drilling rig is a machine which creates holes and/or shafts in the ground. Drilling rigs can be massive structures housing equipment used to drill water wells, oil wells, or natural gas extraction wells or they can be small enough to be moved manually by one person.... - for on-land oil drilling
An offshore platform, often referred to as an oil platform or oil rig, is a large structure used to house workers and machinery needed to drill wells in the ocean bed, extract Petroleum and/or natural gas, process the produced fluids, and ship them to shore.... - for offshore oil drilling
