دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a method of rotary drilling that uses compressed air as the circulation medium. The conventional method of removing cuttings from the wellbore is to use a flow of water or drilling mud. Compressed air removes the cuttings with equal or greater efficiency. The rate of penetration is usually increased considerably when air drilling is used;however, a principal problem in air drilling is the penetration of formations containing water, since the entry of water into the system reduces the ability of the air to remove the cuttings.

n: A method of rotary drilling that uses compressed air as the circulating medium.

drilling with air instead of drilling mud (requires diverters at the surface to handle cuttings and formation fluids).

n: I. the return of a debt (principal and interest) in equal annual instalments. 2. the return of invested principal in a sinking fund.

n: a hard brown or black material composed principally of hydrocarbons. It is insoluble in water but soluble in gasoline and can be obtained by heating some petroleum, coal tar, or lignite tar. It is used for paving and roofing and in paints.

n: A colloidal, viscosity-building clay used principally in salt-water muds.

a colloidal, viscosity building clay used in water based muds. They generate viscosity due to the mechanical interference of their straw shaped bodies.

n: The assemblage opening in palm journal of cone bit. The weld line after cone ball is installed and the ball retaining plug is inserted.

rock fragments that spall or break off the wellbore walls. Usually found as fill in the hole.

n pi: a classification of injection wells under Safe Drinking Water Act that are related to hazardous, industrial nonhazardous, and municipal wastewater disposal below underground sources of drinking water.

n: a sedimentary rock composed of fragments of preexisting rocks. The principal distinction among clastics is grain size. Conglomerates, sandstones, and shales are clastic rocks.

n: 1. a solid cellular residue produced from the dry distillation of certain carbonceous materials that contains carbon as its principal constituent 2. a residue of heavier hydrocarbons formed by thermal cracking and distillation and deposited in the reservoir during in situ combustion. This residue catches fire and becomes the fuel for continued combustion.

a generally insoluble hydrocarbon that has been oxidized to the point of a solid, often hard mass.

A magnetic inflection log, run on wireline that is principally used to locate the depth of threaded pipe connections and other masses of metal.