- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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Downhole measurement of fluid viscosity, typically performed either with logging tools based on nuclear magnetic resonance (NMR) or with sampling tools such as formation testers.
Industry:Oil & gas
Display ranges chosen for the density and neutron porosity logs such that the two curves will overlay at all porosity values providing the matrix is pure quartz and the pores are filled with fresh water. The most common overlay spans two tracks, with the density reading from 1. 9 to 2. 9 g/cm<sup>3</sup>, and the neutron in sandstone porosity units from 0. 45 to ?0. 15 vol/vol.
Industry:Oil & gas
Dissolved gas in wellbore or reservoir fluids. The gas will remain in solution until the pressure or temperature conditions change, at which time it may break out of solution to become free gas.
Industry:Oil & gas
Devices for selecting or excluding data from a data stream or data set. These devices may be physical (for example to tune an electrical circuit to a particular frequency) or a mathematical algorithm. Mathematical filters take many forms, some of which are used in oilfield data analysis and interpretation. Examples include statistical techniques, geostatistical techniques, clustering, conditional algorithm, etc. A simple example of a conditional algorithm might include using a caliper to determine whether a borehole was rugose, thus requiring special log interpretation through the rugose interval.
Industry:Oil & gas
Describing sedimentary rock that contains clay minerals. Even small amounts of clay minerals in pores can drastically reduce porosity and permeability. Dirty and clean are qualitative, descriptive terms to describe the relative amount of clay minerals in a rock.
Industry:Oil & gas
Describing sensors that are embedded in drill collars in order to record measurements-while-drilling.
Industry:Oil & gas
Describing the environment and conditions of the marine zone between low tide and the edge of the continental shelf, a depth of roughly 200 m (656 ft). A neritic environment supports marine organisms, also described as neritic, that are capable of surviving in shallow water with moderate exposure to sunlight.
Industry:Oil & gas
Describing sandy-textured rock or sediment. Arenaceous does not necessarily imply silica-rich, but rather particles of sand size, 0. 625 to 2 mm, according to the Udden-Wentworth scale.
Industry:Oil & gas
Describing a relatively impermeable reservoir rock from which hydrocarbon production is difficult. Reservoirs can be tight because of smaller grains or matrix between larger grains, or they might be tight because they consist predominantly of silt- or clay-sized grains, as is the case for shale reservoirs. <br>Stimulation of tight formations can result in increased production from formations that previously would have been abandoned or produced uneconomically. <br><br>
Industry:Oil & gas
Describing a type of acoustic transducer that emits or receives energy in all directions. Monopole transducers are used in standard sonic logs, and also in array-sonic logs to record shear and Stoneley waves.
Industry:Oil & gas
