See fishing string.

A measurement of the solids deposited on filter paper in thirty-seconds of an inch during standard 30-min api filter test.

See cake thickness.

In certain areas the filter cake thickness is a measurement of the solids deposited on filter paper for 7-1/2-min.

Any tough, stringy material of threadlike structure used to prevent loss of circulation or to restore circulation in porous or fractured formations.

A device placed on a piece of equipment that is lowered into a wellbore so that the equipment may be retrieved by wire line.

A powerful permanent magnet designed to recover metallic objects lost in a well.

The filtration characteristics of a drilling mud.

In general, these qualities are inverse to the thickness of the filter cake deposited on the face of a porous medium and the amount of filtrate allowed to escape from the drilling fluid into or through the medium.

A phenomenon that often occurs in an injection project in which the fluid being injected does not contact the entire reservoir but bypasses sections of the reservoir fluids in a finger-like manner.

Fingering is not desirable, because portions of the reservoir are not contacted by the injection fluid.

An area consisting of a single reservoir or multiple reservoirs all grouped on or related to, the same individual geological structural feature and/or stratigraphic condition.

The escape of the liquid part of a drilling mud into permeable formations.

Decomposition process of certain organic substance, e.g., starch, in which a chemical change is brought by enzymes, bacteria, or other microorganisms.

Often referred to as “souring.”

A tool designed to recover equipment lost in a well.

A pipe or rod coupling with the threads on the inside.

A device used in the testing of filtration properties of drilling mud.

See mud.

A tool that goes inside pipe lost in a well to provide a firm grip and permit recovery of the fish.

Sometimes used in place of a spear.

Failure of a metal under repeated loading.