دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a welded connection using two pipe ends, cut straight across and welded together with minimum circumferential contact.

n: an eccentrically shaped disk, mounted on a camshaft, that varies in distance from its centre to various points on its circumference. As the camshaft is rotated, a set amount of motion is imparted to a follower riding on the surface of the cam. In the intenal-combustion engine, cams are used to operate the intake and exhaust valves.

n: Sticking that occurs when a portion of the drill string (usually the drill collars) becomes embedded in the filter cake resulting in a nonuniform distribution of pressure around the circumference of the pipe. The conditions essential for sticking require

n: the circumference of the horizontal great circle at the equator of a spherical tank. Compare great circle.

n: slip with slip element which intimate contact with the inside of pipe or all outside of circumference surface in drilling tools,and it can stand larger loading.

n: the path on the surface of a sphere-type tank defined by the intersection of a plane surface and including the centre of the sphere. Compare equatorial circumference.

n: a device used to enlarge the size of an existing borehole. It has teeth arranged on its outside circumference to cut the formation as it rotates.

n: a special drilling tool that can enlarge an existing hole to the required diameter.

a larger device (usually of a fixed diameter) that enlarges the wellbore to a diameter equal to or less than the upper casing drift). Compare to an under-reamer or watermelon mill or string mill.

n: a pre-established location in the horizontal plane at ground level along the tank circumference. Compare vertical station.

a trademark for a repeat formation tester.

abbr: a trademark name for multiple formation evaluation. See also drill stem test.