دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a restriction in a profile near the bottom of the well that allows some gas expansion and holds a backpressure on the formation. Rarely used, but considered for hydrate control.

when pressure is dropped rapidly, gas that has permeated the elastomers and some plastics may rupture the surface of a material when the gas expansion caused by the decompression is faster than the gas can pass through the substance. Most severe in weak t

n: the phenomenom of conspicuous volume -broden when the drilled gas reaches the shallow well section

a well that flows to the surface by produced gas expansion and does not use any method of artificial lift.

a reservoir drive mechanism in which gas expansion in the gas cap pushes the oil towards the wellbore.

n: when oil and gas are found in the same reservoir under pressure, the drilling of a well into the reservoir releases the pressure, causing the gas to expand. The expanding gas drives the oil toward and up the well bore. The expansive energy of the gas can be harnessed whether the gas is in solution or forming a cap above the oil.

n: the process of raising or lifting fluid from a well by injecting gas down the well through tubing or through the tubingcasing annulus. Injected gas aerates the fluid to make it exert less pressure than the formation does;the resulting higher formation pressure forces the fluid out of the wellbore. Gas may be injected continuously or intermittently, depending on the producing characteristics of the well and the arrangement of the gas-lift equipment.

one of the artificial lift methods that uses gas injected down the annulus and interspersed into the flowing fluids in the tubing to lessen the density and to assist in vertical flow by gas expansion.

one of several reservoir drive methods including volumetric, depletion, gravity, gas cap, solution gas expansion, water drive, etc.

a zone where the flow type or saturation changes due to gas breakout, gas expansion, shear or turbulence.