دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A rig whose every clutch and drawworks brakestaff are controled by compressive air. Usually assisted with hydraulic brake and dynamic brake.

n: the part of a groove on the drawworks drum that changes direction. Grooves run parallel to each other, except in the angle-control section, where each groove is machined at a slight angle. This angled part of the groove causes the wire rope being spooled onto the drum to change direction so that the next wrap of rope on the drum lies in between the wraps of rope already on the drum. Also called a crossover section.

n: a mechanism used to regulate the amount of weight 00 the bit without the presence of personnel. Automatic drillers free the driller from the sometimes tedious task of manipulating the drawworks brake to maintain correct weight on the bit. Also called an automatic drilling control unit.

n: Mechanism to automatically control the weight on the bit.

n: a braking mechanism on the drawworks, supplemental to the mechanical brake, that permits the lowering of heavy hook loads safely at retarded rates without incurring appreciable brake maintenance. There are two types of auxiliary brake-the hydrodynamic and the electrodynamic. In both types, work is converted into heat, which is dissipated through liquid cooling systems. See electrodynamic brake, hydrodynamic brake.

n: The additional device of mechanical brake.Decreasing the maintenance of brake system and making landing heavy loading safe. There are two kinds of forms: one is hydrodynamic, the other is dynamic.

n: a device for arresting the motion of a mechanism, usually by means of friction. as in the drawworks brake. Compare electrodynamics brake. hydrodynamic brake.

n: The device operated by the driller to stop the motion of the draw-works.

the main device for stopping the travel of the drawworks of a rig when running or pulling a drill string.

n: a part of the brake mechanism consisting of a flexible steel band lined with a material that grips a drum when tightened. On a drilling rig, the brake band acts on the flanges of the drawworks drum to control the lowering of the travelling block and its load of drill pipe, casing, or tubing.

n: Bourdon plate whose inner surface is installed with several brake blocks at definite interval.

n: the part of the brake that presses on the brake drum. On the drawworks, the circular series of brake blocks are bolted to the brake bands with counter- sunk brass bolts;the lining is the frictional, or gripping, element of a mechanical brake.

n: Refers to the lining of brake staple which is consisted of a set of brake blocks. Fixed in the inner surface of brake staple with head aluminium screw. Brake lining stops when the surface of brake holds the brake drum.

n: (slang) a driller who is said to rely too heavily on the drawworks brake.

n: Slang. Depreciated name for the driller who depends on brake gear super.

n: a device attached to the catshaft of the drawworks that is used as a power source for unscrewing drill pipe;usually located opposite the drillers side of the drawworks. See cathead.

n: The self-releasing cathead installed in the cat shaft of drawworks.