دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a clutch containing an inflatable tube that, when inflated, causes the clutch to engage the driven member. When the tube is deflated, disengagement occurs.

n: a fishing tool installed inside washover pipe to prevent a fish stuck off bottom from falling to bottom during a washover. Slips on the anchor washpipe spear engage the inside of the washover pipe as the pipe travels downhole around the fish.

n: a section of pipe with lefthand threads on one end and conventional right-hand threads on the other. In setting a liner, a back-off joint is attached to it so that the drill pipe may be disengaged from the liner by conventional right-hand rotation.

n: The pipe sub whose one respect is left hand thread and the other one is right hand thread.

n: a special tool with a rubber packer or lead seal that is used to repair casing. When casing is damaged downhole, a cut is made below the damaged casing, the damaged casing and the casing above it are pulled from the well, and the damaged casing is removed from the casing string. The tool is made up and lowered into the well on the casing until it engages the top of the casing that remains in the well, and a rubber packer or lead seal in the tool forms a seal with the casing that is in the well. The casing-patch tool is an overshot1ike device and is sometimes called a casing overshot.

n: A kind of tool for casing with rubber packer or sealing. Used for repairing casing.

n: The pressure gauge installed at the outlet of cement pump. Reflects the changement of pressure in cementing.

abbr: choke-line friction pressure. clingage n: the amount of oil that adheres to the wall of a measuring or prover tank after draining.

choke line friction pressureClinker: pea to marble sized pellets of raw cement prior to grinding.

n: a coupling used to connect and disconnect a driving and a driven part of a mechanism, especially a coupling that permits the former part to engage the latter gradually and without shock. In the oilfield, a clutch permits gradual engaging and disengaging of the equipment driven by a prime mover. v: to engage or disengage a clutch.