دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a chemical additive that reduces the setting time of cement. See cement, cementing materials.

n: A downhole tool used in conjunction with a jar to store energy that is released suddenly when the jar operates.

n: a wireline instrument for measuring bottomhole temperature or pressure. It contains a clock-driven recording section and either a pressure element or a temperature element. It is thin enough to pass downhole through small tubing.

n: a fishing tool installed inside washover pipe to prevent a fish stuck off bottom from falling to bottom during a washover. Slips on the anchor washpipe spear engage the inside of the washover pipe as the pipe travels downhole around the fish.

Injection of fluids down the annulus or “backside”. Common as a gas supply path for gas lift. Also used in some fracturing operations, to spot fluids downhole when no packer is used or a type of injection valve is in the tubing to allow entry of chemicals

a downhole safety valve that shuts off the annulus.

n: a classification system for oilwell cements, defined in API Specification 10A.

n: Oilwell cement class suggested by API regulates that there are 9 classes of cement, A to J. They can be used according to the downhole temperature and depth.

n: The operation that scoop up the cutting and mud water from the well. A method of cleaning downhole.

A cement plug, set with no downhole flow conditions, which allows temporary or permanent shut-off in a well. It takes into account the densities of all fluid columns, both in the string and in the annulus.

a steel, aluminum, brass or plastic ball pumped or dropped downhole to shift or operate a tool.

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.