A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid and torque to the drill bit. The term is loosely applied to the assembled collection of the smuggler pool, drill collars, tools and drill bit. The drill string is hollow so that drilling fluid can be pumped down through it and circulated back up the annulus.
A photograph of a broken segment of drill string
With roughneck and fish tail bit on drill collar, 1938, Climax-Molybdenum Co. plant, Iowa Colony, Texas
8 inch drilling jar (red and white) on casings
Oilfield Surface Resonant Vibrator
In geotechnical engineering, drilling fluid, also known as drilling mud, is used to aid the drilling of boreholes into the earth. Used while drilling oil and natural gas wells and on exploration drilling rigs, drilling fluids are also used for much simpler boreholes, such as water wells.
Driller pouring anti-foaming agent down the drilling string on a drilling rig
Baryte powder used for preparation of water-based mud
Fluid pit
Mud Pit