Oil and Gas Terms Beginning with “T” — Page 2

A floating device used in marineseismic acquisition to identify the end of a streamer. Tail buoys allow the seismic acquisition crew to monitor the location and direction of streamers. They are commonly brightly… Read more →

The last cement system pumped during primary cementing. The tail cement covers the lower sections of the well, especially planned completion intervals, and is typically more dense than the lead slurry that precedes it. Read more →

A cutoff in time, offset or both that has the effect of eliminating some types of noise from seismic data. A tail mute can be used to exclude slow surface waves such as ground roll. Read more →

The tubulars and completion components run below a production packer. The tail pipe may be included in a completion design for several reasons. It can provide a facility for plugs and other temporary flow-control… Read more →

A list containing details of tubulars that have been prepared for running, or that have been retrieved from the wellbore. Each tubing joint is numbered and the corresponding length and other pertinent details noted… Read more →

(noun) A graphical method used in directional drilling to plot the wellbore trajectory by assuming a straight-line path between successive survey stations at the inclination and azimuth measured at the lower station.… Read more →

A metal or plastic vessel used to store or measure a liquid. The three types of tanks in an oil field are drilling, production and storage tanks. Read more →

A group of tanks that are connected to receive crude oilproduction from a well or a producing lease. A tankbattery is also called a battery.In the tank battery, the oil volume is measured and tested before pumping the… Read more →

The settlings -- sediment, dirt, oil emulsified with water and free water -- that accumulate in the bottom of storage tanks. The tank bottoms are periodically cleaned up and settlings can be disposed of or treated by… Read more →

(noun) The process of determining the relationship between liquid level and contained volume in a storage tank through physical measurement (strapping), optical methods, or liquid calibration techniques. Tank… Read more →

A structure constructed around an oil tank to contain the oil in case the tank collapses. The volume or space inside the tank dike should be greater than the volume of the tank. A tank dike is also called a fire wall. Read more →

A table that shows the tank capacity in barrels as a function of the liquid level inside the tank. A tank table is also called a tank capacity table or gauge table. Read more →

The capacity of all the tanks in a field Read more →

A ship designed to transport crude oil, liquefied petroleum gas (LPG), liquefied natural gas (LNG), synthetic natural gas (SNG) or refined products. Tankers with 100,000 deadweight tons of capacity or more are called… Read more →

The acids found in tannin. Quebracho contains tannic acid. Read more →

Chemical extracted from the bark of trees and used as clay deflocculant in water muds. Tannins are moderate molecular weight, anionic polymers with complex structures. Quebracho is a tannin. Read more →

A fishing tool used to engage on the internal diameter of a hollow fish, such as drillpipe or drill collar. By rotating the taper tap when it is in contact with the fish, a threaded profile is cut, enabling the taper… Read more →

In a nuclear magnetic resonance measurement, the use of a gradual rather than a sharp cutoff to distinguish between bound water and free water. A sharp cutoff at, for example T2 = 33 ms in sandstones, is normally used… Read more →

A tubing string or work string that is made up from tubulars of different outside diameters (OD). In production applications, this may be used to improve the flow and production characteristics of a well. In drilling… Read more →

A sand body that contains heavy hydrocarbon residues such as tar or asphalt, or degraded oil that has lost its volatile components. Hydrocarbons can be liberated from tar sands by heating and other processes, but tar… Read more →

An agreement between a host country and operator to allow the operator to evaluate geological, geophysical, engineering and transportation issues involving a concession. Also known as a TEA. Read more →

Location relative to the boundary of a tectonic plate, particularly a boundary along which plate tectonic activity is occurring or has occurred. Read more →

(noun) The large-scale deformation of the Earth's crust driven by plate tectonic forces, including folding, faulting, uplift, and subsidence. Tectonism creates the structural traps, migration pathways, and basin… Read more →

A system for converting the measurements recorded by a wireline or measurements-while-drilling (MWD) tool into a suitable form for transmission to the surface. In the case of wireline logging, the measurements are… Read more →

A device used to indicate the position or function of mechanical components that cannot be easily observed, such as to indicate the launch of a cementing plug or dart. Read more →

A low-frequency electrical current that occurs naturally over large areas at or near the surface of the Earth. Telluric currents are induced by changes in Earth's magnetic field which are usually caused by interactions… Read more →

An electromagnetic method in which naturally occurring, low-frequency electric currents (telluric currents), are measured at a base station and compared with values measured at other stations. The normalized… Read more →

A record of the temperature gradient in a well. The temperature log is interpreted by looking for anomalies, or departures, from the reference gradient. This reference might be the geothermal gradient, a log recorded… Read more →

The characteristic of a drilling fluid or a mud product pertaining to its response to prolonged heating, usually in a controlled mud composition in a rolling- or static-aging test. Read more →

A temperature data set taken at various depths in the wellbore. Temperature surveys are used to determine the top of cement behind the casing, fluid contacts and water influx. It is also useful to check for valve and… Read more →