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...lift_fig2.png|Figure 2]]). Gas is normally injected down the tubing/casing annulus and enters the tubing via the gas lift valves. A surface gas compressor is ...ype pump which lifts the produced fluids and hydraulic fluid up the casing annulus toward the surface. The hydraulic fluid most commonly used is produced oil

...and up the ''[http://www.glossary.oilfield.slb.com/en/Terms/a/annulus.aspx annulus]'' or “back side” (the space between the drill pipe and the borehole). ...mud into the [http://www.glossary.oilfield.slb.com/en/Terms/a/annulus.aspx annulus] at the crossover spool in the event that heavier mud is needed to control

| V_a || Annular volume; the volume of the annulus, the area between the outside of the drillpipe or collar and the open or ca [[Drilling fluid]] is then pumped back up the hole to the surface via the annulus, therefore bit-to-surface (b-to-s) or lag calculations are made as follows:

...through nozzles in the drilling bit. The mud returns to the surface up the annulus, the space outside of the drill pipe. The mud lubricates the bit, prevents ...duction well, the reservoir will be isolated behind casing or a liner. The annulus between the rock and the liner is filled with cement. This means that it is

* annulus http://www.glossary.oilfield.slb.com/en/Terms/a/annulus.aspx

...or two packers. The tool isolates the formation from the mud column in the annulus. When the tool is opened, reservoir fluid can flow into the drill pipe (and

...packers because they can withstand more differential pressure between the annulus and the drill string. The number of packers depend upon experience and test