دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a short cylindrical device installed in the drill stem between the bottom most drill collar and a downhole motor. Its purpose is to deflect the downhole motor off vertical to drill a directional hole. See drill stem.

a short section of a tool or pipe that is formed at an angle or is modified downhole by a motor to assist in entering deviated wellbores or drilling off the path of the wellbore.

n: a business that provides directional hole planning, sophisticated directional tools, and on- site assistance to the oil company operator of a drilling rig.

n: a wellbore intentionally drilled at an angle from the vertical. See directional drilling.

n: During the process of drilling,the direction of deflection and the axis figure go forward according to anticipated design.

n: Refer to directional hole,please!

n: the process of positioning a deflection tool so that it faces in the direction necessary to achieve the desired direction and drift angle for a directional hole.

n: the process by which a deflection tool is correctly positioned to achieve the intended direction and inclination of the wellbore.

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.