دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: refer to drill collar lift nipple

n: also called a lifting sub or a lifting nipple. See lifting nipple.

n: refer tolifting nipple

n: a short piece of pipe with a pronounced upset, or shoulder, on the upper end, screwed into drill pipe, drill collars, or casing to provide a positive grip for the elevators. Also called a lifting sub or a hoisting plug.

n: a tool that used to hoist and lower non-cog bit..

n: also called hoisting plug or lifting nipple. See lifting nipple.

n: A short drillstring component that is temporarily connected to the top of a tool assembly that is to be lifted vertically, such as when running or retrieving a tool string. The external profile on the upper section of the lifting sub is similar to that of

the short pipe section that screws into the top of the tubing hanger and is then latched onto by the elevators to manipulate the tubing string.

n: a short, threaded piece of pipe used to adapt parts of the drilling string that cannot otherwise be screwed together because of differences in thread size or design. A sub (i.e., a substitute) may also perform a special function. Lifting subs are used with drill collars to provide a shoulder to fit the drill pipe elevators;a kelly saver sub is placed between the drill pipe and the kelly to prevent excessive thread wear of the kelly and drill pipe threads;a bent sub is used when drilling a directional hole.

n: A shot section of pipe ,tubing ,or drill pipe run into a hole.

a short section of pipe, used to describe tools or to solve space-out gaps.