05.07.2009
To reach the objective depth in drilling a well
Lowest or deepest part of a well
Constitutes about 10% – 15% of the overall ash, has an appearance similar to dark gray coarse sand and its particles are clusters of micron-sized granules, up to 10 mm in diameter
A heavy, thick-walled steel pipe used in rotary drilling to turn the drill bit and to provide a conduit for the drilling mud.
See drilling rig
The hole drilled for the purpose of producing oil and gas, or to inject water or other fluids. The wellbore includes the openhole or uncased portion of the well