Oil and Gas Well Drilling and Servicing » Glossary of Terms - E

This is an abridged version of the Dictionary of Petroleum Terms provided by Petex and the University of Texas Austin. © Petex 2001
Electric Cable Tray

electric cable tray
n: supports the electrical cables that feed the power from the control panel to the rig motors.

Electric Control House

electric control house
n: On diesel electric rigs, diesel engines drive electric generators. The generators produce electricity that flow throw cables to electric switches and control equipment enclosed in a control cabinet or panel. Electricity is fed to electric motors via the panel.

electric log
n: see electric well log.

electric rig
n: a drilling rig on which the energy from the power source—usually diesel engines—is changed to electricity by generators mounted on the engines. The electrical power is then distributed through electrical conductors to electric motors. The motors power the various rig components. Compare mechanical rig.

electric submersible pumping
n: a form of artificial lift that utilizes an electric submersible multistage centrifugal pump. Electric power is conducted to the pump by a cable attached to the tubing.

electric survey
n: see electric well log.

electric well
log n: a record of certain electrical characteristics (such as resistivity and conductivity) of formations traversed by the borehole. It is made to identify the formations, determine the nature and amount of fluids they contain, and estimate their depth. Also called an electric log or electric survey.

elevator links
n pl: cylindrical bars that support the elevators and attach them to the hook.


n pl: on rotary rigs and top drive rigs, hinged steel devices with manual operating handles that crew members latch onto a tool joint (or a sub).

n: a machine for converting the heat content of fuel into rotary motion that can be used to power other machines. Compare motor.

n: the process by which material (such as rock or soil) is worn away or removed (as by wind or water).

evening tour
(pronounced "tower") n: the shift of duty on a drilling rig that generally starts in the afternoon and runs through the evening. Sometimes called afternoon tour. Compare daylight tour.

external cutter
n: a fishing tool containing metalcutting knives that is lowered into the hole and over the outside of a length of pipe to cut it. The severed part of the pipe can then be brought to the surface. Also called an outside cutter. Compare internal cutter.