Negative pressure gradient definition

Negative pressure gradient means the condition that results from the creation of a localized hydrological cone of depression or pressure sink within the production zone caused by the production of more fluid than was injected. The purpose of this pressure gradient is to contain the recovery fluid by causing natural ground water to move from the surrounding area toward the production zone.
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Related to Negative pressure gradient

  • Pressure vessel means a vessel that may be used for containing, storing, distributing, transferring, distilling, processing or otherwise handling any gas, vapour or liquid under pressure greater than the atmospheric pressure and includes any pipeline fitting or other equipment attached thereto or used in connection therewith; and

  • Pressure means the total load or force per unit area acting on a surface.

  • True vapor pressure means the equilibrium partial pressure exerted by a petroleum liquid as determined in accordance with methods described in American Petroleum Institute (API) Bulletin 2517, Evaporation Loss from External Floating Roof Tanks, 1980. The API procedure may not be applicable to some high viscosity or high pour crudes. Available estimates of true vapor pressure may be used in special cases such as these.

  • Positive pressure respirator means a respirator in which the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator.

  • medium voltage means the set of nominal voltage levels that lie above low voltage and below high voltage in the range of 1 kV < Un 44 kV. [SANS 1019]