دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: to amass or collect. When oil and gas migrate into porous formations, the quantity collected is called an accumulation.

n pi: bacteria that require free oxygen for their life processes. Aerobic bacteria can produce slime or scum, which accumulates on metal surfaces, causing oxygen-concentration cell corrosion.

the deviation angle (from vertical) at which a solid material will no longer fall down the pipe, but will begin to accumulate on the pipe wall. The angle of repose for dry, round sand is about 62o and for wet sand about 50o to 60o depending on size, shape

n: a hydrocarbon trap in which petroleum accumulates in the top of an anticline. See anticline.

n: 1. a pressurised device capable of transferring liquid;sometimes used to transfer crude oil and water mixtures if pump agitation would create unwanted emulsions.2. a small tank in which liquids are accumulated and drained by applying gas or air pressure above the liquid level. Such a vessel is usually located below a pipeline or other equipment at a location where an outside power source is not convenient for removing the drained liquids. Sometimes referred to as a drip.

n: The phenomenon that the cuttings accumulate in the wellbore because flushing cannt clean the wellbore timely in the drilling programe. It is one of the most important affecting factor of bit penetration.

n: a milling device attached to the bottom of washpipe that mills or drills debris accumulated around the outside of the pipe being washed over. Usually, a bum shoe has pieces of very hard tungsten carbide embedded in it. Also caned a rotary shoe. See washpipe.

n: a specialised form of intermittent-flow gas lift that functions in the same way as other forms, except that, when the injection gas is off, incoming well fluids accumulate in a chamber having a larger diameter than the tubing. For the same volume of fluid, hydrostatic head and wellbore pressure at the formation are both reduced.

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: 1. the water and hydrocarbon liquids that have condensed from the vapor state in the natural gas flow line and accumulated in the low points of the line. 2. the receiving vessel that accumulates such liquids.

condensate liquid, or natural gasoline.