دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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.

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 sudden and usually of short-duration increase in pressure. When pipe or casing is nm into a hole too rapidly, an increase in the hydrostatic pressure results, which may be great enough to create lost circulation.

n: a sudden,usually short duration increase in pressure. When pipe or casing is run into a hole too rapidly, an increase in the hydrostatic pressure results, which may be great enough to create lost circulation.

v: 1. to move the drill stem up and down in the hole over a short distance without rotation. Careless execution of this operation creates pressure surges that can cause a formation to break down, resulting in lost circulation. 2. to force a wireline tool or tubing down the hole by using a reciprocating motion. 3. to begin drilling a well;i.e., to spud in.

n: To start the well drilling process by removing rock ,dirt and other sedimentary material with the drill bit.

to begin drilling.

n: a tank or vessel through which liquids or gases are passed to ensure steady flow and to eliminate pressure surges.