The assembly of well control equipment including preventers, spools, valves, and nipples connected to the top of the casinghead.

A device designed or form a seal on the hole with no pipe or in the annular space with pipe in the hole. The equipment can […]

A hole made by drilling or boring. See wellbore.

A type of mobile offshore drilling unit (MODU) that has a part of its structure in contact with the sea floor when it is on site […]

The lowest or deepest part of a well. adj pertaining to the bottom of the wellbore.

A device with a restricted opening placed in the lower end of the tubing to control the rate of flow. See Choke.

1) the pressure at the bottom of a borehole. It is caused by the hydrostatic pressure of the wellbore fluid and, sometimes, by any back-pressure held […]

A diagram used in risk management to depict and analyze causual relationships in high-risk operations. The  diagram takes it name from its characteristic shape. The Bowtie  […]

The female section of a connection. See tool joint.

A device for arresting the motion of a mechanism, usually by means of friction, as in the drawworks brake. Compare Electrodynamic brake, Hydromatic brake.

Is the horsepower output of an engine or motor actually measurable by various means, most simply a special type of brake having an arm counterbalanced by […]

A device attached to the catshaft of the drawworks that is used as a power source for unscrewing drill pipe; usually located opposite the driller’s side […]