Related Oil & Gas Terms

• Pressure gradient

  1. a scale of pressure differences in which there is a uniform variation of pressure from point to point. for example, the pressure gradient of a column of water is about 0.433 pounds per square inch per foot (9.794 kilopascals per meter) of vertical elevation. the normal pressure gradient in a formation is equivalent to...

• Pressure

  The force that a fluid (liquid or gas) exerts uniformly in all directions within a vessel, pipe, hole in the ground, and so forth, such as that exerted against the inner wall of a tank or that exerted on the bottom of the wellbore by a fluid. pressure is expressed in terms of force exerted...

• Normal formation pressure

  Formation fluid pressure equivalent to about 0.465 pounds per square foot of depth from the surface. if the formation pressure is 4,650 pounds per square inch at 10,000 feet, it is considered normal....

• Pressure maintenance

  Repressuring of an oil-field to maintain original pressure. the use of water flooding or natural gas recycling during primary recovery to provide additional formation pressure and displacement energy that can supplement and conserve natural reservoir drives. although commonly begun during primary production, pressure maintenance methods are often considered to be a form of enhanced oil...

• Reservoir drive mechanism

  The process in which reservoir fluids are caused to flow out of the reservoir rock and into a wellbore by natural energy. gas drives depend on the fact that, as the reservoir is produced, pressure is reduced, allowing the gas to expand and provide the driving energy. water-drive reservoirs depend on water pressure to force...