National Oilwell Varco 2015 Annual Report Download - page 29

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Table of Contents
Kelly spinner A pneumatically operated device mounted on top of the kelly that, when actuated, causes the
kelly to turn or spin. It is useful when the kelly or a joint of pipe attached to it must be spun up,
that is, rotated rapidly for being made up.
Kick An entry of water, gas, oil, or other formation fluid into the wellbore during drilling. It occurs
because the pressure exerted by the column of drilling fluid is not great enough to overcome the
pressure exerted by the fluids in the formation drilled. If prompt action is not taken to control the
kick, or kill the well, a blowout may occur.
Making-up 1. To assemble and join parts to form a complete unit (e.g., to make up a string of drill pipe). 2. To
screw together two threaded pieces. Compare break out. 3. To mix or prepare (e.g., to make up a
tank of mud). 4. To compensate for (e.g., to make up for lost time).
Manual tongs (Tongs) The large wrenches used for turning when making up or breaking out drill pipe, casing, tubing, or
other pipe; variously called casing tongs, pipe tongs, and so forth, according to the specific use.
Power tongs or power wrenches are pneumatically or hydraulically operated tools that serve to
spin the pipe up tight and, in some instances to apply the final makeup torque.
Master bushing A device that fits into the rotary table to accommodate the slips and drive the kelly bushing so
that the rotating motion of the rotary table can be transmitted to the kelly. Also called rotary
bushing.
Mooring system The method by which a vessel or buoy is fixed to a certain position, whether permanently or
temporarily.
Motion compensation equipment Any device (such as a bumper sub or heave compensator) that serves to maintain constant weight
on the bit in spite of vertical motion of a floating offshore drilling rig.
Mud pump A large, high-pressure reciprocating pump used to circulate the mud on a drilling rig.
Plug gauging The mechanical process of ensuring that the inside threads on a piece of drill pipe comply with
API standards.
Pressure control equipment Equipment used in: 1. The act of preventing the entry of formation fluids into a wellbore. 2. The
act of controlling high pressures encountered in a well.
Pressure pumping Pumping fluids into a well by applying pressure at the surface.
Ram blowout preventer A blowout preventer that uses rams to seal off pressure on a hole that is with or without pipe. Also
called a ram preventer.
Ring gauging The mechanical process of ensuring that the outside threads on a piece of drill pipe comply with
API standards.
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