دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see washover pipe. washover back-off connector n: a fishing tool that is made up in a length of washover pipe connected to the top of the fish once the washover is completed, and then backed off the fish, thus enabling the washed-over part of the fish to be retrieved. The tool permits washover, back-off, and pulling to be carried out in one round trip.

n: In fishing operations, a large-diameter pipe fitted with an internal grappling device and tungsten carbide cutting surfaces on the bottom. The washover pipe can be lowered over a fish in the wellbore and to latch onto and retrieve the fish. Since the wash

n: an accessory used in fishing operations to go over the outside of tubing or drill pipe stuck in the hole because of cuttings, mud, and so forth, that have collected in the annulus. The washover pipe cleans the annular space and permits recovery of the pipe. It is sometimes called washpipe.

n: In fishing operations, a large-diameter pipe fitted with an internal grappling device and tungsten carbide cutting surfaces on the bottom. The washover pipe can be lowered over a fish in the wellbore and to latch onto and retrieve the fish. Since the wash

a recovery tool that fits over the OD of the lost pipe.

n: a reduction in the permeability of a formation caused by the invasion of water into the pores.

n: A condition caused by an increase in water saturation in the near-wellbore area. Water block typically forms during the drilling phase of a well, when the near-wellbore area is exposed to a relatively high volume of filtrate from the drilling fluid. The i

a relative permeability problem usually occurring in a gas zone. Highest potential formations for water blocks are low pressure gas sands (<0.25 psi/ft pore pressure),with small pore throats (<10 microns),lower permeability (<100 md),and when using wat

n: (W/C) water put into an empty string of pipe in a wellbore to prevent the pipe from being crushed by pressure in the annulus.

n: A volume of water placed in a tubing string prior to conducting a drillstem test or opening a well to flow. The water cushion is designed to reduce and control the pressure drawdown applied to the reservoir when the downhole valve or tester valve is opene

a level of water in a string to be used for flowback to generate an initial damping back pressure.

purposely injecting water below and/or into the reservoir to drive the oil towards the producing wellbore. This is a secondary recovery mechanism.

wellbore stability.

wellbore seismic.

n: the hole made by the drilling bit, which can be open, cased, or both. Also called borehole, hole, or wellbore.

n: The cave in the wellbore caused by overcut.

n: The wiper trip and reaming to wellbore by tripping in drill string.