The movement of oil from the area in which it was formed to a reservoir rock where it can accumulate.

Abbreviation: 1,000 cubic feet of gas per day.

A calibrated funnel used in field tests to determine the viscosity of drilling mud.

A large valve used to shut in a well.

The valve on the choke and flow line that is nearest to the preventer assembly.

Its purpose is to stop the flow through the choke and flow line.

A connection with the threads on the outside.

A drilling rig in which the source of power is one or more internal-combustion engines and in which the power is distributed to rig components through mechanical devices (such as chains, sprockets, clutches, and shafts).

Also called a power rig.

The procedure by which acid flow is confined to the natural permeability and porosity of the formation.

Compare fracture acidizing.

A percussion tool operated mechanically to give an upward thrust to a fish by the sudden release of a tripping device inside the tool.

If the fish can e freed by an upward blow, the mechanical jar can be very effective.

Also called a hydraulic jar.

A manifold system of valves, usually situated at the power source, which may be operated manually (or by remote control) to direct pressurized fluid to closing devices at wellhead.

See rise pipe.

A cylindrical bar, spindle, or shaft around which other parts are arranged or attached or that fits inside a cylinder or tube.

A hole in the side of a tank through which a man can enter the tank, also the cleanout plate.

1.

A large valve located on the christmas tree and used to control the flow of oil and gas from a well.

Also called master gate.

2.

The blind or blank rams of a blowout preventer (obsolete).

Commonly called the funnel viscosity.

The marsh funnel viscosity is reported as the number of seconds required for a given fluid to flow 1 qt through the marsh funnel.

In some areas, the efflux quantity is 1,000 cc.

See api-rp13b for instructions.

See also kinematic viscosity.