دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: English system buttress thread whose top angle is 29°. Mainly used to convey dynamic.

n: Both ends are thick thread, used to connect joints with different thread and diameter.

a piece of equipment that connects pipe, flanges or other equipment with different root threads or connection mechanisms.

n: The nipple whose whole length is lathed with thread.

n: Breaks at different joints in turn in order to check every joint periodically and avoid joint galling and thread fracturing.

A thread for tools and equipment that has three parallel threads per inch (similar to a BW thread). Used in applications of 1.75” OD thread or less.

v: the procedure whereby one threaded piece (such as a pipe) is unscrewed from another.

v: To disconnect a string of pipe by unscrewing one threaded piece from another.

unscrewing a tool or equipment. In pipe recovery, back-off of a joint precedes recovery of the upper section in a well. Common in plug and abandonment or sidetrack operations.

n: To unscrew one threaded piece (as a section of pipe) from another

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 kind of explosive package used for breakouting pack of dynamic. It is sent by cable to first thread above the sticking point. Pull the drill stem and rotate left the