دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: to treat oil-bearing limestone or other formations with acid for the purpose of increasing production. Hydrochloric or other acid is injected into the formation under pressure. The acid etches the rock, enlarging the pore spaces and passages through which the reservoir fluids flow. Acid also removes formation damage by dissolving material plugging the rock surrounding the wellbore. The acid is held under pressure for a period of time and then pumped out, after which the well is swabbed and put back into production. Chemical inhibitors combined with the acid prevent corrosion of the pipe. acid recovery plant n: plant for therecovery of sulfuric acid from acid sludge.

n: a drilling fluid made up mainly of chemical salts, such as sodium chloride, calcium chloride, or potassium chloride. Clear brine contains little or no clay or other solid material and is virtually transparent. It is often used when drilling into a producing formation because clear brine minimises formation damage. See completion fluid formation damage.

a brine without suspended solids.

a brine that does not create formation damage or permeability reduction when introduced into a formation.

n: low-solids fluid or drilling mud used when a well is being completed. It is selected not only for its ability to control formation pressure, but also for the properties that minimise formation damage.

n: A special drilling mud used when a well is being competed. It is selected not only for its ability to control formation pressure, but also for its properties that minimize formation damage.

a brine, oil or gas based fluid that is used as isolation (kill, separation, inhibition functions, etc.) fluid during the completion of a well. Commonly sea water, NaCl brine, formation water, KCl brine, CaCl2 brine, etc. Oil based fluids are common where

n: a quantity of water, drilling fluid, or compressed gas placed inside drill pipe or tubing to control both annular and formation pressures. Usually mud in the pipe or tubing supports prevents the pipe or tubing from collapsing;mud also holds back formation pressure pushing up the pipe or tubing. But sometimes, such as in drill stem testing, it is necessary to have empty pipe or tubing downhole. The cushion protects the pipe or tubing until it is in place. It also allows control of the rising formation pressure as the cushion is removed, as in drill stem testing, to prevent formation damage.

n: The definite water, drill fluid or compressed gas poured into drill pipe or oil tube.

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.

n: a method to get pay formation data(ratio of the formation damage,production capacity,permeability) in which the dual CIP valve is used to get the closed-in-pressure value

n: a special drilling fluid that contains a salt or an ester of formic acid (formate),which is chemically combined with another element such as potassium or cesium. Formate fluids are very stable at high temperatures and can be made very dense (heavy) without adding weighting materials such as barite. Formate fluids are used as completion fluids because they minimise formation damage. See completion fluid, formation damage.

n: the reduction of permeability in a reservoir rock caused by the invasion of drilling fluid and treating fluids to the section adjacent to die wellbore. It is often called skin damage.

n: damage to the productivity of a well resulting from invasion into the formation by mud particles or mud filtrates. Asphalt from crude oil will also damage some formations.

an obstruction to flow. Usually a reduction of permeability.

n: it is usually evaluated by mean permeability of damage zone.