دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

sudden backflow of a well, usually to clean the perforations.

n: 1. a tubular device placed in a vertical position, either inside or outside a larger vessel, and through which well fluids are conducted before they enter the larger vessel. A boot aids in the separation of gas from wet oil. Also called a flume or conductor pipe. 2. a large pipe connected to a process tank to provide a static head that can absorb surges of fluid from the process tank. Also called surge column.

v: to lower the drill stem rapidly a few feet into the hole and then stop it suddenly with the drawworks brake. A surge of pressure in the mud in the drill stem and annular space results and may help to flush out debris accumulated in or on die pipe. The pressure surge may break down a formation, however, causing lost circulation, or may damage the bit if it is near the bottom.

v: Landing the drill string speedily and then braking. This operation can produce stiring pressure to clean the cutting laying up in the drill pipe. But this pressure may lead to formation fracturing or circulation loss.

n: an air- or inert gas-filled device that minimises pressure surges in the output line of a mud pump. Sometimes called a surge dampener.

a device in the line filled with gas that may reduce the surges of pressure pulsation or flow slugging.

events such pressure surge or fracturing that occur over a few hundred milliseconds.

a method of applying a very high pressure surge to the formation at the instant of perforating. Usually in excess of 1.4 psi/ft. Designed to overcome frac initiation pressure and break down each perf with a very short (<1 m) frac.

n: a sub with a glass blockage in the bore, used to isolate a surge chamber in gravel packing or perforation cleaning operations.

often a rupture disk to allow a well to flow after it is broken by a dropped bar.

n: an oilwell that has come in with such great pressure that the oil jets out of the well like a geyser. In reality, a gusher is a blowout and is extremely wasteful of reservoir fluids and drive energy. In the early days of the oil industry, gushers were common and many times were the only indication that a large reservoir of oil and gas had been struck. See blowout.

n: an uncontrolled release of oil from the wellbore at surface.

a well drilled into a high pressure formation that results in an immediate surge towards the surface. In the days of cable tools with minimum fluid (hydrostatic) head, the formation fluids often flowed to surface when the pay zone was penetrated.

n: a surge of engine speed to a higher number of revolutions per minute (rpm),followed by a drop to normal speed without manual movement of the throttle. It is often caused by a faulty or improperly adjusted governor.