National Oilwell Varco 2011 Annual Report Download - page 27

Index to Financial Statements
Kelly bushing A special device placed around the kelly that mates with the kelly flats and fits into the master bushing of the rotary table.
The kelly bushing is designed so that the kelly is free to move up or down through it. The bottom of the bushing may be
shaped to fit the opening in the master bushing or it may have pins that fit into the master bushing. In either case, when the
kelly bushing is inserted into the master bushing and the master bushing is turned, the kelly bushing also turns. Since the
kelly bushing fits onto the kelly, the kelly turns, and since the kelly is made up to the drill stem, the drill stem turns. Also
called the drive bushing.
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.
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.
Riser A pipe through which liquids travel upward.
Riser pipe The pipe and special fitting used on floating offshore drilling rigs to established a seal between the top of the wellbore,
which is on the ocean floor, and the drilling equipment located above the surface of the water. A riser pipe serves as a guide
for the drill stem from the drilling vessel to the wellhead and as a conductor or drilling fluid from the well to the vessel. The
riser consists of several sections of pipe and includes special devices to compensate for any movement of the drilling rig
caused by waves. Also called marine riser pipe, riser joint.
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