ERSC 4P10 Lecture Notes - Lecture 4: Blowout Preventer, Drill String, Mud Logging
22 Jan 2016
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Document Summary
Used for shallow wells (most often water wells today). A bit is attached to a cable and is raised up and down. The action of the bit punches the hole, rather than drilling it. Spring-pole drilling was used in the 18th and 19th centuries (water wells early on) and could drill to almost 100m, by human power alone. Steam engines allowed for deeper wells to a depth of almost 200 m. drilling method in the movie there will be blood . Used for > 80% of oil and gas wells. Engines rotate the turntable and power other equipment (pumps, hoist, etc: most engines are 1,000 to 3,000 hp. >3,000 hp needed to drill below 7,000 m: with conventional drilling the entire drill string turns in order to turn the bit and drill the hole. The mud pump and mud hose deliver mud down the hole where it circulates back up to the mud tank: the function of mud is:
