- 行业: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
- Company Profile:
Ownership by a lessee, company or working interest owner, which is burdened with the costs of leasing the acreage and drilling and operating a well.
Industry:Oil & gas
Organic materials consisting of aromatic and naphthenic ring compounds containing nitrogen, sulfur and oxygen molecules. The asphaltene fraction of crude is defined as the organic part of the oil that is not soluble in straight-chain solvents such as pentane or heptane. <br><br>Asphaltenes exist as a colloidal suspension stabilized by resin molecules (aromatic ring systems) in the oil. The stability of asphaltic dispersions depends on the ratio of resin to asphaltene molecules. The determination of the quantity of resin is important in estimating the potential damage created by asphaltenes. <br><br>Asphaltene precipitates as a result of pressure drop, shear (turbulent flow), acids, solution carbon dioxide (CO<sub>2</sub>), injected condensate, mixing of incompatible crude oils or other conditions or materials that break the stability of the asphaltic dispersion. For example, in matrix acidizing, iron ions in solution favor the precipitation of asphaltene deposits.
Industry:Oil & gas
One-tenth of a milliGal: (10 g. U. = 1. 0 mGal). Gravity units are sometimes used in old gravity maps.
Industry:Oil & gas
Opening the valve on a drip to allow natural gas to blow or clear the pipe of all liquids.
Industry:Oil & gas
One of three main classes of rock (igneous, metamorphic and sedimentary). Metamorphic rocks form from the alteration of preexisting rocks by changes in ambient temperature, pressure, volatile content, or all of these. Such changes can occur through the activity of fluids in the Earth and movement of igneous bodies or regional tectonic activity. The texture of metamorphic rocks can vary from almost homogeneous, or nonfoliated, to foliated rocks with a strong planar fabric or foliation produced by alignment of minerals during recrystallization or by reorientation. Common foliated metamorphic rocks include gneiss, schist and slate. Marble, or metamorphosed limestone, can be foliated or non-foliated. Hornfels is a nonfoliated metamorphic rock. Graphite, chlorite, talc, mica, garnet and staurolite are distinctive metamorphic minerals.
Industry:Oil & gas
One of the three main classes of rock (igneous, metamorphic and sedimentary). Sedimentary rocks are formed at the Earth's surface through deposition of sediments derived from weathered rocks, biogenic activity or precipitation from solution. Clastic sedimentary rocks such as conglomerates, sandstones, siltstones and shales form as older rocks weather and erode, and their particles accumulate and lithify, or harden, as they are compacted and cemented. Biogenic sedimentary rocks form as a result of activity by organisms, including coral reefs that become limestone. Precipitates, such as the evaporite minerals halite (salt) and gypsum can form vast thicknesses of rock as seawater evaporates. Sedimentary rocks can include a wide variety of minerals, but quartz, feldspar, calcite, dolomite and evaporite group and clay group minerals are most common because of their greater stability at the Earth's surface than many minerals that comprise igneous and metamorphic rocks. Sedimentary rocks, unlike most igneous and metamorphic rocks, can contain fossils because they form at temperatures and pressures that do not obliterate fossil remnants.
Industry:Oil & gas
One of the principal equipment components of a coiled tubing unit. The injector head incorporates special profiled chain assemblies to grip the coiled tubing string and a hydraulic drive system that provides the tractive effort for running and retrieving the string from the wellbore. The base of the injector head is secured to the wellhead pressure-control equipment by the stripper assembly mounting system. The gooseneck mounted on top of the injector head feeds the tubing string from the reel around a controlled radius into the injector head.
Industry:Oil & gas
On a laterolog device, the current sent through a guard electrode (A1) with the purpose of focusing the current sent by the central current emitting electrode (A0). The bucking current maintains A1 and A0 at the same potential, thereby forcing the current from A0 to run approximately perpendicular to the sonde into the formation.
Industry:Oil & gas
Oil that does not move when fluids are flowed through the rock in normal conditions, for example primary and secondary recovery, and invasion.
Industry:Oil & gas
