دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a federal excise tax on crude oil. It has a different rate for oil in a number of categories, for example, newly discovered oil, stripper oil, and stripper oil produced by independents. The tax rate is determined as a percentage-for instance, at 25%---of the difference between a base price and a market price. There are a variety of exceptions and exemptions;interested parties should query the IRS or a tax accountant.

n: a valve on the wing of a Christmas tree. See also wing.

a valve located at the tree, above the master valve, on the flow line.

n: 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.

n: a device that secures the end of a bend in the wire rope to the body of the wire rope. A typical safety clamp consists of a U-shaped bolt that is fastened to the wire rope with a saddle-shaped base. Two nuts on the base thread onto the U-bolt to secure the clamp to the rope. Depending on the diameter of the wire rope, which determines the amount of rope that is looped back on itself to secure the rope to the tongs or other device, clamps can vary in number from one to three.

n: a device containing a valve that closes around the wireline to shut in the well if high pressure threatens a blowout. Also called a wireline valve.

n: 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 finnly against the sidewall while a piston creates a vacuum in a test chamber. Formation fluids enter the test 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 trip in the hole, so they are very useful in formation testing.

a formation fluid sampling device.

n pi: the lowering of mechanical tools, such as valves and fishing tools, into the well for various purposes. Electric wireline operations, such as electric well logging and perforating, involve the use of conductor line, which in the oil patch is commonly but erroneously called wireline.

n: The operation that running all kinds of mechanical tool through wireline.

n pi: special tools or equipment made to be lowered into and retrieved from the well on a wireline, e.g., packers, swabs, gas-lift valves, measuring devices.

tools specifically designed to operate on wireline conveyance. May be either for slickline (non electrical signal conducting) or for electric line.

n: a service vehicle or unit on which the spool of wireline is mounted for use in downhole wireline work.

The truck be used to help tripping wire-line tools through wire rope .

n: see wireline blowout preventer.