| wheel-type back-off wrench |
a
wheel-shaped wrench that is attached to the sucker rod string at the surface and is
manually turned to unscrew the string to allow it to be pulled from the well. |
| whipstock |
a long
steel casing that uses an inclined plane to cause the bit to deflect from the original
borehole at a slight angle. Whipstocks are sometimes used in controlled directional
drilling, in straightening crooked boreholes, and in sidetracking to avoid unretrieved
fish. |
| whipstock |
a long
steel casing that uses an inclined plane to cause the bit to deflect from the original
borehole at a slight angle. Whipstocks are sometimes used in controlled directional
drilling, in straightening crooked boreholes, and in sidetracking to avoid unretrieved
fish. |
| whipstock anchor packer |
a
special-purpose packer placed in the casing to permit a sidetrack operation. |
| wickers |
broken
or frayed strands of the steel wire that makes up the outer wrapping of wire rope. |
| widow maker |
anything
liable to cause death or serious injury of a workman. |
| wildcat |
1. a
well drilled in an area where no oil or gas production exists. 2. (nautical) the geared sheave of a windlass used to pull anchor
chain.
v: to drill wildcat wells. |
| wild well |
a well
that has blown out of control and from which oil, water, or gas is escaping with great
force to the surface. Also called a gusher. |
| winch |
a
machine used for pulling or hoisting that does so by winding a cable around a spool. |
| wind guy line |
the
wireline attached to ground anchors to provide lateral support for a mast or derrick.
|
| wing |
the
horizontal valving on a tree. |
| wiper plug |
a
rubber-bodied, plastic- or aluminum-cored device used to separate cement and drilling
fluid as they are being pumped down the inside of the casing during cementing operations.
A wiper plug also removes drilling mud that adheres to the inside of the casing. |
| wireline |
a
small-diameter metal line used in wireline operations. Also called slick line. Compare conductor line. |
| wireline entry guide |
a
flared-end sub run on the end of the tubing string to permit easy access of wireline tools
into the tubing ID. |
| wireline feeler |
a tool
used to gauge and clean junk and debris from the casing in conjunction with a junk
catcher. |
| wireline formation tester |
a
formation fluid sampling device, actually run on conductor line rather than wireline, that
also logs flow and shut-in pressure in rock near the borehole. A spring mechanism
holds a pad firmly against the sidewall while a piston creates a vacuum in a test chamber.
Formation fluids enter the tes5t chamber through a valve in the pad. A
recorder logs the rate at which the test chamber is filled. Fluids may also be drawn
to fill a sampling chamber. Wireline formation tests may be done any number of times
during one tip in the hole, so they are very useful in formation testing. |
| wireline preventer |
a
manually operated ram preventer especially adapted for closure around a wireline. |
| wireline probe |
a
diagnostic tool used to ascertain the position of a gas leak in the tubing of a gas lift
well. |
| wireline survey |
a
general term often used to refer to any type of log being run in a well. |
| wire rope |
a cable
composed of steel wires twisted around a central core of fiber or steel wire to create a
rope of great strength and considerable flexibility. Wire rope is used as drilling
line (in rotary and cable-tool rigs), coring line, servicing line, winch line, and so on.
It is often called cable or wireline; however, wireline is a single, slender metal
rod, usually very flexible. Compare wireline. |
| wireline entry guide |
a
flared-end sub run on the end of the tubing string to permit easy access of wireline tools
into the tubing ID. |
| wireline preventer |
a
manually operated ram preventer especially adapted for closure around a wireline. |
| wireline preventers |
preventers
installed on top of the well or drill string as a precautionary measure while running
wirelines. The preventer packing will close around the wireline. |
| wireline probe |
a
diagnostic tool used to ascertain the position of a gas leak in the tubing of a gas-lift
well. |
| wireline survey |
a
general term often used to refer to any type of log being run in a well. See log. |
| WOC |
abbreviation:
Waiting-on-Cement |
| WOE |
abbreviation:
Waiting-on-Engineering |
| WOG |
abbreviation:
Water-Oil-Gas |
| work string |
the
string of drill pipe tubing suspended in a well to which is attached a special tool or
device that is used to carry out a certain task, as squeeze cementing or fishing. |
| working pressure |
the
pressure to which a particular piece of equipment is subjected during normal operations. |
| workover fluid |
any type
of fluid used in the workover operation of a well. See completion fluid. |
| workover rig |
see production rig. Also
see pulling unit. |
| workover string |
the
string of drill pipe or tubing suspended in a well to which is attached a special tool or
device that is used to carry out a certain task, such as squeeze cementing or fishing. |
| workover |
to
perform one or more of a variety of remedial operations on a producing oil well to try to
increase production. Examples of workover operations are deepening, plugging back,
pulling and resetting liners, squeeze cementing, and so on. |
| workstring |
a string
of pipe used in workover of well-servicing operations; not typically considered as
production tubing. |
| worms |
see weevils. |
