- Industry: Oil & gas
- Number of terms: 8814
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Small liquid droplets (moisture or liquid hydrocarbons) in a gas stream. In separators, mist extractors are used to collect mist.
Industry:Oil & gas
Rock types that have been classified according to their petrophysical properties, especially properties that pertain to fluid behavior within the rock, such as porosity, capillary pressure, permeabilities, irreducible saturations or saturations. Petrophysical rock types are often calibrated from core and dynamic data, but are usually calculated from wireline logs, where possible, because the wireline logs are generally the only measurements that are available for all wells at all depths. Electrofacies approaches are often used to determine rock types from logs.
Industry:Oil & gas
Scales for different logs that are chosen so that the logs will overlay in certain conditions. For example, a sandstone-compatible scale may have the neutron log scaled from 0. 45 to -0. 15 vol/vol and the density from 1. 9 to 2. 9 g/cm<sup>3</sup>. Then, in a pure quartz sandstone filled with fresh water, the two logs will overlay as the porosity varies.
Industry:Oil & gas
Reservoirs with sealed or apparent outer boundaries that result in pressure depletion. Mathematical treatments differ between bounded and infinite reservoirs.
Industry:Oil & gas
Relating to two or more logging measurements that have the same response. The term normally refers to vertical resolution, but could also be used for azimuthal or radial resolution. The term implies that all the features of the vertical response are matched, ideally in all conditions. In practice, it is used to describe a more detailed matching of the vertical response than with resolution-matched curves.
Industry:Oil & gas
Relating to two or more logging measurements that have the same resolution. The term normally refers to vertical resolution, but could also be used for azimuthal or radial resolution.
Industry:Oil & gas
Relating to a formation or interval containing gas, either dissolved in the formation fluid or as free gas. The term is occasionally used to describe wellbore fluids containing dissolved gas.
Industry:Oil & gas
Relating to being held against, or taken from, the side of the borehole. The term also describes a measurement that must be made by pressing the sonde against the side of the borehole in order to minimize borehole effects, as, for example, a sidewall epithermal neutron log.
Industry:Oil & gas
Related to any aspect of logging that employs an electrical cable to lower tools into the borehole and to transmit data. Wireline logging is distinct from measurements-while-drilling (MWD) and mud logging.
Industry:Oil & gas
Related to a wireline log of formation resistivity based on the principle of inducing alternating current loops in the formation and measuring the resultant signal in a receiver. In the simplest device, an alternating current of medium frequency (10?s of kHz) is passed through a transmitter coil, thereby inducing an alternating magnetic field in the formation. This field creates current loops in the formation. The loops produce their own magnetic field, which induce a current when they cross the receiver coil. This signal is proportional to the conductivity of the formation, with contributions from different regions of the formation summing approximately in conductivity. As a result, the induction log is most accurate at high conductivities and with resistive invasion. However, below about 1 ohm-m skin effect becomes important. <br><br>Practical induction-logging tools use arrays of several coils, designed to achieve a specific focusing and depth of investigation. These arrays are either hardwired, such as the 6FF40, 5FF40 and others, or consist of several simple arrays that are combined in software (an array induction). For many years, the most common induction log was the 6FF40. This was often combined with the medium induction and a shallow laterolog or microresistivity log so as to correct for the effect of invasion, assuming a step profile. Induction logs also need borehole correction and shoulder-bed correction. In older tools, this was accomplished through multiple correction charts, while modern tools include software for this purpose. <br><br>H. G. Doll introduced the first practical induction-logging technique in 1949. See Doll HG: Introduction to Induction logging and Application to Logging of Wells Drilled with Oil Base Mud Journal of Petroleum Technology 1, no. 6 (June 1949): 148-162.
Industry:Oil & gas
