HYDRAULIC ROTARY DRILLING RIG

A drilling rig is a machine which creates holes 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 and are called 

augers. They sample sub-surface mineral deposits, test 

rock, soil and groundwater physical 

properties, and also can be used to install sub-surface 

fabrications, such as underground 

utilities, instrumentation, tunnels or wells. Drilling rigs can 

be mobile equipment mounted on 

trucks, tracks or trailers, or more permanent land or 

marine-based structures (such as oil 

platforms commonly called 'offshore oil rigs' even if they 

don't contain a drilling rig). The 

the term "rig" therefore generally refers to the complex of equipment that is used 

to penetrate the surface of the Earth's crust.