The ability of the formations to withstand applied pressure.

Also called formation integrity.

Fluid (such as gas, oil, or water) that exists in a subsurface rock formation.

A vertical or horizontal vessel into which oil or emulsion is run to allow any water not emulsified with the oil (free water) to drop out.

Application of hydraulic pressure to the reservoir formation to create fractures through which oil or gas may move to the well bore.

Instantaneous re-emission of light of a greater wave length than that light originally absorbed.

The high rate of flow made by a good well right after it is drilled.

The pressure gradient (psi/ft) at which the formation accepts whole fluid from the wellbore.

A test used to determine the amount of pressure required to cause a formation to fracture.

A chemical used to lighten the water column in gas wells, in oilwells producing gas, and in drilling wells in which air or gas is used as the drilling fluid so that the water can be forced out with the air or gas to prevent its impeding the production or drilling rate.

Pipe in which the outside diameter of the joint is the same as the outside diameter of the tube.

Pipe may also be internally flush-joint.

An organic acid, h2co2 or hcooh, used for acidizing oilwells.

It is stronger than acetic acid but much less corrosive than hydrofluoric or hydrochloric acid and is usually used for high-temperature wells.

A lease storage tank to which produced oil is run.

The flow of fluids within a pipe.

Injection of gases or liquids into a reservoir to force oil toward and into producing wells.

A plug in the flow line at the well head which has a small hole drilled through it through which oil flows, and which keeps a well from flowing at too high a rate.