See inside blowout preventer.

A mass of very fine gravel placed around a slotted liner in a well.

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

The heaviest-wall casing section of the string, usually located just below the preventers or tree.

A permanent flame, sometimes located at the top of a stack, for disposing of combustible gas produced from refining or chemical process, as in a petroleum refinery or oil rig.

Gas / oil ratio.

May refer to a solution gor or total gor.

The technique of injecting gas into a reservoir.

It may be done for pressure maintenance, oil viscosity reduction, light end stripping or storage.

see injection gas.

To agitate the drilling fluid in a pit by means of a mud gun, electric mixer, or agitator.

A rope or cable used to steady a mast or pole.

To create holes in casing and cement set through a productive formation.

A common method of completing a well is to set casing through the oil-bearing formation and cement it.

A perforating gun is then lowered into the hole and fired to detonate high-powered jets or shoot steel projectiles (bullets) through the casing and cement and into the pay zone.

The formation fluids flow out of the reservoir through the perforations and into the wellbore.

See perforating gun.

A naturally occurring crystalline form of calcium sulfate in which each molecule of calcium sulfate is combined with two molecules of water.

See calcium sulfate.

A slang term to denote a mixture of diesel oil and bentonite.

An oilwell that has come in with such great pressure that the oil jets out of the well like a geyser.

In reality, a gusher is a blowout and is extremely wasteful of reservoir fluids and drive energy.

In the early days of the oil industry, gushers were common and many times were the only indication that a large reservoir of oil and gas had been struck.

See blowout.

Any hydrophilic plant polysaccharides or their derivatives that, when dispersed in water, swell to produce a viscous dispersion or solution.

Unlike resins, they are soluble in water and insoluble in alcohol.

Any relatively sticky formation (such as clay) encountered in drilling