- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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A log of formation density from one of the quadrants of an azimuthal density tool.
Industry:Oil & gas
A log of elemental concentrations from which the geochemistry of the formation may be derived. Several logs provide information on elemental weight concentrations: natural gamma ray spectroscopy, elemental capture spectroscopy or pulsed neutron spectroscopy and aluminum activation. The combination of some or all of their outputs is known as a geochemical log, since it provides information on most of the principal elements found in sedimentary rocks. Pulsed neutron spectroscopy provides relative elemental yields, whereas absolute concentrations are needed for quantitative results. Absolute concentrations can be derived by calibration to core or by using a model such as the oxide-closure model. The absolute elemental concentrations can then be converted into mineral concentrations using a model that defines what minerals are present. The first complete geochemical logs were run in the mid 1980s.
Industry:Oil & gas
A lifting device used when performing coiled tubing operations from a semisubmersible rig or drillship. The coiled tubing injector and pressure-control equipment are positioned within the lifting frame, which is attached to the flow head and running string and supported by the traveling blocks. This configuration enables the heave-compensation system of the rig to counteract the vessel motion.
Industry:Oil & gas
A lifting device, similar in function to a crane jib, that is used in a number of oilfield applications, such as for handling tubulars on a snubbing unit, tool strings on a slickline unit or on a winch truck, and for general lifting at the wellsite.
Industry:Oil & gas
A light liquid hydrocarbon used to absorb or remove the heavier liquid hydrocarbons from a wet gas stream. Absorption oil is also called wash oil.
Industry:Oil & gas
A lightweight workover unit specifically designed for running and retrieving rod strings and rod pumps. Rod units are generally truck-mounted and configured to suit the relatively light work associated with rod-pump servicing.
Industry:Oil & gas
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 alongside.
Industry:Oil & gas
A log in which the changes in reading with depth only occur abruptly, with no transition. A square log is often an approximation of a real log, in which the continuously varying input log has been approximated by constant values and abrupt changes. A square log contains less data than a real log but can be useful for further processing.
Industry:Oil & gas
A log obtained in the laboratory by moving the core past a gamma ray detector. The log can be of the total gamma ray in API units, or of the spectral response in weight concentrations of thorium, uranium and potassium. The main purpose is to correlate the depth of each section of core with the depth of a log.
Industry:Oil & gas
A log of elemental concentrations derived from the characteristic energy levels of gamma rays emitted by a nucleus that has been activated by neutron bombardment. The carbon-oxygen log, elemental capture spectroscopy log, pulsed neutron spectroscopy log, aluminum activation log and oxygen activation log are all examples of activation logs. However, the term is most commonly used to refer to the aluminum and oxygen activation logs, the latter also being known as a water-flow log.
Industry:Oil & gas
