A method of well completion in which a slotted or perforated liner, often wire-wrapped, is placed in the well and surrounded by gravel.

If open hole, the well is sometimes enlarged by underreaming at the point where the gravel is packed.

The mass of gravel excludes sand from the wellbore but allows continued production.

A device for measuring and recording the specific gravity of a gas or liquid passing a point of measurement.

A packer used for the well completion method of gravel packing.

An exploration method in which an instrument that measures the intensity of the earth’s gravity is passed over the surface or through the water.

In places where the instrument detects stronger or weaker than normal gravity forces, a geologic structure containing hydrocarbons may exist.

A surface device used in pressure control for slickline.

A cylindrical metal ring used to guide packers past casing obtrusions.

A hoe or other kind of weed cutter.

The specific gravity or density of oil expressed in terms of a scale devised by the american petroleum institute.

The lighter the oil, the greater the gravity; other factors being equal, the higher the api gravity, the better price the oil will bring.

Density expressed as the ratio of the weight of a volume of substance to the weight of an equal volume of another standard substance.

In the case of liquids and solids, the standard is water.

In the case of natural gas or other gas materials, the standard is air.

See shake out

One of the horizontal braces between the legs of a derrick.

1.

A condition sometimes encountered in a pumping well when dissolved gas, released from solution during the upstroke of the plunger, appears as free gas between the valves.

If the gas pressure is sufficient, the standing valve is locked shut, and no fluid enter the tubing.

2.

A device fitted to the gauging hatch on a pressure tank that enables manual dipping and sampling without loss of vapor.

1.

A device that is inserted into a pipeline for the purpose of cleaning; a line scraper.

Also called a pig.

2.

A device that is lowered into the borehole of a well for various purposes such as enclosing surveying instruments, detonating instruments, and the like.

A measure of the volume of gas produced with oil, expressed in cubic feet per barrel of cubic meters per tonne.

Any material (i.e., paper, cork, asbestos, or rubber) used to seal two essentially stationary surfaces.