دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A formation pressure that is higher than the normal formation fluid hydrostatic pressure.

n: pressure exceeding or falling below the pressure to be expected at a given depth. Normal pressure increases approximately 0.465 pow1ds per square inch per foot of depth or 10.5 kilopascals per metre of depth. Thus, normal pressure at 1,000 feet is 465 pounds per square inch;at 1,000 metres it is 10,500 kilopascals. See pressure gradient.

n: A formation pressure that deviates from the normal formation fluid hydrostatic pressure. Such pressure may be classified as "subnormal" (lower than normal) or "overpressured" (higher than normal).

n: A drilling method that make fluid column pressure in the well balance with formation pressure. It can improve ROP obviously, protect reservoir, and decrease or avert mud eroding and lossing.

nipple that can be blocked off from formation pressure and give a false pressure measurement.

n: an uncontrolled flow of gas, oil, or other well fluids into the atmosphere. A blowout, or gusher, occurs when formation pressure exceeds the pressure applied to it by the column of drilling fluid. A kick warns of an impending blowout. See kick.

an uncontrolled release of fluids from a well.

n: The minimal force breaking some stone which suffers overlying formation pressure and whose particles bind with each other.

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: Keep the core in the reservoir pressure with special core barrel and coring technology.

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: the amount of pressure exerted inside the drill pipe as a result of circulating pressure, entry of formation pressure into the well, or both.