دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a large, load supporting formation that may serve to reduce the total overburden load on a pay zone. These formations may cover hundreds of square miles over a basin. A second use is as a semi-stable structure of sand grains around a perforation or other

n: see open-hole completion.

a very simple, open hole pay zone completion with a minimum of downhole equipment. Also called an open hole completion. The casing is usually run to the top of the pay and is cemented above the pay only.

the pay zone exposed to the wellbore. This may or may not be the entire pay.

v: to penetrate the productive formation after the casing is set and cemented on top of the pay zone.

n: a drilling fluid specially formulated to minimize formation damage as the borehole penetrates the producing zone. See formation damage. Compare completion fluid.

the fluid used to drill the pay zone.

a controlled production of a small amount of fluid from an isolated section of the pay zone into the chamber formed by the drill pipe and a downhole valve. DST’s measure pressures, some elements of depletion and gather samples of the produced fluids.

n: a single well that produces from two separate formations at the same time. Production from each zone is segregated by running two tubing strings with packers inside the single string of production casing, or by ruunign one tubing string with a packer through one zone while the other is produced through the annulus. In a miniaturised dual completion, two separate 4.5-inch (11.4-centimetre) or smaller casing strings are run and cemented in the same wellbore.

n: a completion method in which two hydrocarbon reservoirs with different pressure in the same well



two pay zones in the same well that produce up independent flow paths in the same well.

A well deviated above the pay to reach further from the drill site or further into the pay formation to expose my contact area with the pay zone.

the thickness of a pay zone or formation, usually the gross (total) thickness.