- Отрасли: Oil & gas
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A particular relation between the formation factor (F) and porosity (phi) proposed by the Humble Oil Company. The original formula was expressed as F = 0. 62 / phi<sup>2. 15</sup>. A nearly equivalent form, with a simpler porosity exponent, is F = 0. 81 / phi<sup>2</sup>. These formulae are considered most suitable for relatively high-porosity, sucrosic, or granular, rocks. <br><br>See Winsauer WO, Shearin HM, Masson PH and Williams M: Resistivity of Brine-Saturated Sands in Relation to Pore Geometry, AAPG Bulletin 36 (1952): 253-277.
Industry:Oil & gas
A particular model, or equation, for deriving the water saturation from resistivity and other logs. The model assumes a laminar shale distribution and considers the total resistivity to be the sum in parallel of the sand and shale laminae.
Industry:Oil & gas
A parametric approach to stochastic imaging or simulation of a reservoir. Simpler than the indicator (nonparametric) approach, Gaussian techniques include a normal score transform of the data to produce a new variable that is, by construction, univariate and normally distributed.
Industry:Oil & gas
A part at the end of tubulars, such as drillpipe, casing or other tubing, which has extra thickness and strength to compensate for the loss of metal in the threaded ends.
Industry:Oil & gas
A particular arrangement of transmitters and receivers used in the electromagnetic propagation measurement in which the dipoles used as sensors are oriented along the axis of the tool. The orientation is combined with relatively long spacings to give deeper penetration, and hence less effect of mudcake or rugosity.
Industry:Oil & gas
A parameter used to characterize thermal neutron interactions in bulk material. Thermal diffusion length (L<sub>d</sub>) is the characteristic distance between the point at which a neutron becomes thermal and the point of its final capture. It is related to the quantity of thermal absorbers in the formation, and therefore is an important factor in the thermal neutron porosity measurement. Thermal neutrons have about the same energy as the surrounding matter, typically less than 0. 4 eV (0. 025 eV at room temperature).
Industry:Oil & gas
A packer assembly that can be removed from the wellbore only by drilling or milling. Drillable packers, and similar tools such as bridge plugs, are typically made from cast iron, aluminum, plastic or similar brittle materials.
Industry:Oil & gas
A parameter used to characterize neutron interactions in bulk material above the thermal region. The slowing-down length (L<sub>s</sub>) is proportional to the root-mean-square distance from the point of emission of a high-energy neutron to the point at which its energy has decreased to the lower edge of the epithermal energy region. The slowing-down length is the physical parameter that best describes the response of an epithermal neutron porosity measurement, and describes a large part of the response of a thermal neutron porosity measurement. Thermal neutrons have about the same energy as the surrounding matter, typically less than about 0. 4 eV, while epithermal neutrons have higher energy, between about 0. 4 and 10 eV.
Industry:Oil & gas
A nonreproducible error that is generally imputable to the physics of the measurement. For example, the statistical errors in nuclear measurements are random errors.
Industry:Oil & gas
A non-thermal heavy oil production method. Similar in concept to SAGD, in vapor extraction a solvent vapor is used to reduce viscosity of the heavy oil. The injected solvent vapor expands and dilutes the heavy oil by contact. The diluted heavy oil will drain by gravity to the lower horizontal well, to be produced.
Industry:Oil & gas
