National Oilwell Varco 2015 Annual Report Download - page 27

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Table of Contents
Coiled Tubing A continuous string of flexible steel tubing, often hundreds or thousands of feet long, that is
wound onto a reel, often dozens of feet in diameter. The reel is an integral part of the coiled
tubing unit, which consists of several devices that ensure the tubing can be safely and efficiently
inserted into the well from the surface. Because tubing can be lowered into a well without having
to make up joints of tubing, running coiled tubing into the well is faster and less expensive than
running conventional tubing. Rapid advances in the use of coiled tubing make it a popular way
in which to run tubing into and out of a well. Also called reeled tubing.
Cuttings Fragments of rock dislodged by the bit and brought to the surface in the drilling mud. Washed
and dried cutting samples are analyzed by geologist to obtain information about the formations
drilled.
Directional Well Well drilled in an orientation other than vertical in order to access broader portions of the
formation.
Drawworks The hoisting mechanism on a drilling rig. It is essentially a large winch that spools off or takes in
the drilling line and thus raises or lowers the drill stem and bit.
Drill Pipe Elevator (Elevator) On conventional rotary rigs and top-drive rigs, hinged steel devices with manual operating
handles that crew members latch onto a tool joint (or a sub). Since the elevators are directly
connected to the traveling block, or to the integrated traveling block in the top drive, when the
driller raises or lowers the block or the top-drive unit, the drill pipe is also raised or lowered.
Drilling jars A percussion tool operated manually or hydraulically to deliver a heavy downward blow to free a
stuck drill stem.
Drilling mud A specially compounded liquid circulated through the wellbore during rotary drilling operations.
Drilling riser A conduit used in offshore drilling through which the drill bit and other tools are passed from the
rig on the water’s surface to the sea floor.
Drill stem All members in the assembly used for rotary drilling from the swivel to the bit, including the
Kelly, the drill pipe and tool joints, the drill collars, the stabilizers, and various specialty items.
Fiberglass-reinforced spoolable pipe A spoolable glass fiber-reinforced epoxy composite tubular product for onshore oil and gas
gathering and injection systems, with superior corrosion resistant properties and lower installed
cost than steel.
Flexible pipe A dynamic riser that connects subsea production equipment to a topside facility allowing for the
flow of oil, gas, and/or water. Also used on the seafloor to tie wells and subsea equipment
together.
Formation A bed or deposit composed throughout of substantially the same kind of rock; often a lithologic
unit. Each formation is given a name, frequently as a result of the study of the formation outcrop
at the surface and sometimes based on fossils found in the formation.
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