What is annular area?

An annulus or the annular region can basically be defined as a shape that is made out of two circles. It is a plane figure that is formed by two concentric circles. The region covered between two concentric circles is known to be the annulus or the annular region.

How do you find annular area?

Video quote: So if we go back to our original drawing we see that we have two R's a little R for the smaller circle and a capital R for the larger circle. So the area of the annulus will be pi times big R squared.

What do you mean by annulus?

Definition of annulus



1 : ring. 2 : a part, structure, or marking resembling a ring: such as. a : a line of cells around a fern sporangium that ruptures the sporangium by contracting. b : a growth ring (as on the scale of a fish) that is used in estimating age.

What is annulus in oil and gas?

The annulus of an oil well is the space between two concentric objects. In a completed well, there are normally at least two annuli. The A annulus is the space between the production tubing and the smallest casing string, while the B annulus is located between different casing strings.

What is annular oil?

The annulus of an oil well or water well is any void between any piping, tubing or casing and the piping, tubing, or casing immediately surrounding it.

What is annular gas?

A flow of formation gas in the annulus between a casing string and the borehole wall. Annular gas flows occur when there is insufficient hydrostatic pressure to restrain the gas. They can occur in uncemented intervals and even in cemented sections if the cement bond is poor.

What is annular space for a well?

An annular space is a ring-shaped space outside the drillpipe, through which mud and cuttings are removed. The annular space between the drillpipe and the borehole was so narrow that there was a violent upward flow of drilling fluid containing cuttings.

What is annular pressure?

Annular pressure is the pressure that builds up in the spaces between the drill string and the external casing or borehole wall. Excess pressure can cause problems in a trenchless drilling operation. It is important to measure and monitor this pressure while drilling if possible.

What does annular seal mean?

Annular seal means a watertight seal of approved material placed between the well casing and the sidewall of the boring excavation. Sample 1. Sample 2. Annular seal means the cement grout or bentonite placed between the conductor casing and the borehole or the well casing and the borehole.