Oil & Gas Glossary 1.0

A facility located at the surface for the purpose of:

A cylindrical or spherical vessel used to isolate the components in mixed streams of fluids. See oil and gas separator.

A cylindrical or spherical vessel used to isolate the components in streams of mixed fluids. See oil and gas separator.

A small house used for keeping lease records, changing clothes, or any other use around a lease.

A natural gas liquid recovered from gas well gas (associated and non-associated) in lease separators of field facilities.

Lease Automatic Custody Transfer, possible where measuring equipment installed at the point of transfer from lease to pipeline is so completely automated as not to require any manual activity or witnesses.

An item of production equipment used to separate liquid components of the well stream from gaseous elements. Separators are either vertical or horizontal and either cylindrical or spherical in shape. Separation is accomplished principally by gravity, the heavier liquids falling to the bottom and the gas rising to the top. A float valve or other liquid-level control regulates the level of oil in the bottom of the separator.

Slang for gas separator

A device that removes gas from the mud coming out of a well when a kick is being circulated out.

Lease operator or pumper.

(2) separating gas from that portion of associated and non-associated gas which liquefies at temperature and pressure conditions of the separator.

(1) separating casinghead gas from produced crude oil and water at the temperature and pressure conditions of the separator; and

A single unit which acts as an oil and gas separator, an oil heater, and an oil and water treater.

The total production of oil from a well or lease during a specified period of time.

A truck equipped with a pair of poles, and hoisting equipment for use in lifting heavy machinery around a lease.

(1) to achieve the recovery of natural gas liquids from the stream of natural gas which may or may not have been processed through lease separators and field facilities, and

The person or company, either proprietor or lessee, actually operating an oilwell or lease. Generally, the oil company by whom the drilling contractor is engaged.

A lease storage tank to which produced oil is run.

Also called a lease operator or pumper. See pumper

A lease or a number of leases of adjoining tracts of land that constitute a unit of acreage sufficient to justify the expense of drilling a wildcat.

A tank used in the field to receive crude oil as it comes from the well. Also called a flow tank or lease tank.

A vessel that heats an emulsion and removes water and gas from the oil to raise it to a quality acceptable for a pipeline or other means of transport. A heater-treater is a combination of a heater, free-water knockout, and oil and gas separator.

1. an automatic valve that opens or closes when an abnormal condition occurs (e.g., a pressure relief valve on a separator that opens if the pressure exceeds the set point, or the shutdown valve at the wellhead that closes if the line pressure becomes too high or too low).

A reduction in US taxes for owners of an economic interest in minerals in place to compensate for the exhaustion of an irreplaceable capital asset. This economic interest includes mineral interest, working interest in a lease, royalty, overriding royalty, production payment interest, and net profits interest.

A device that prevents leakage along a piston, rod, propeller shaft, or other moving part that passes through a hole in a cylinder or vessel. It consists of a box or chamber made by enlarging the hole and a gland containing compressed packing. On a well being artificially lifted by means of a sucker rod pump, the polished rod operates through a stuffing box, preventing escape of oil and diverting it into a side outlet to which is connected the flow line leading to the oil and gas separator or to the field storage tank. For a bottomhole pressure test, the wireline goes through a stuffing box and lubricator, allowing the gauge to be raised and lowered against well pressure. The lubricator provides a pressure-tight grease seal in the stuffing box.