05.07.2009
An international system unit of power equal to one joule per second
A level beneath the Earth’s surface, below which all pore spaces are filled with water and above which the pore spaces are filled with air. The top of the zone of saturation in a subsurface rock, soil or sediment unit
Waste heat, or rather residual heat refers to heat produced by equipment and industrial processes for which no useful application is found, and is regarded as a waste by-product. Power stations and manufacturing plants waste a staggering amount of energy, with power plants sometimes wasting two-thirds of the energy they produce. If the heat is at a such low temperature that it is not possible to recuperate it and generate with it any useful energy, or work (in whatever form), then it is not “wasted” (Carnot’s Law). Only if it is at a sufficiently high temperature where, if desired, it may be utilized for another process and this is not done, can it be defined as residual heat
The energy absorbed by tissue from ionising radiation. One gray is one joule per kg, but this is adjusted for the effect of different kinds of radiation, and thus the sievert is the unit of dose equivalent used in setting exposure standards.
For acoustics, the speed at which a sound wave (a longitudinal wave) travels through a medium. Velocity is measured in units of distance/time. The velocity or speed of a sound wave in any medium is dependent on both the inertial and elastic properties of the medium. In air, the speed of sound is dependent on the air’s pressure and its temperature. At one atmosphere of pressure and a temperature of 20°C (68°F), the speed of sound is approximately 343 m/s (750 mph).
Static wellhead pressure during test
The pressure measured in the wellhead of a producing well
Production from oil and gas wells can be increased using compression to provide reduction of backpressure in well bores, increased pressures into sales lines, and recovery of valuable hydrocarbon vapors from stock tanks. Often changes in the pressure will dramatically increase oil and gas production from low volume wells
The equipment installed at the surface of the wellbore. A wellhead includes such equipment as the casinghead and tubing head. The point at which the crude (and/or natural gas) exits the ground. Following historical precedent, the volume and price for crude oil production are labeled as “wellhead,” even though the cost and volume are now generally measured at the lease boundary. In the context of domestic crude price data, the term “wellhead” is the generic term used to reference the production site or lease property
The hole drilled for the purpose of producing oil and gas, or to inject water or other fluids. The wellbore includes the openhole or uncased portion of the well