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: 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 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.

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.

v: to lower the drill stem rapidly a few feet into the hole and then stop it suddenly with the drawworks brake. A surge of pressure in the mud in the drill stem and annular space results and may help to flush out debris accumulated in or on die pipe. The pressure surge may break down a formation, however, causing lost circulation, or may damage the bit if it is near the bottom.

v: Landing the drill string speedily and then braking. This operation can produce stiring pressure to clean the cutting laying up in the drill pipe. But this pressure may lead to formation fracturing or circulation loss.

n: a device mounted near the drawworks drum to keep the driller from inadvertently raising the travelling block into the crown block. A probe senses when too much line has been pulled onto the drum, indicating that the travel block is about to strike the crown. The probe activates a switch that simultaneously disconnects the drawworks from its power source and engages the drawworks brake.

a device that keeps the traveling block from being raised ito the crown block.

n: the mechanical brake on the drawworks that can prevent the drawworks drum from moving.

n: a method of detennining optimum weight on bit and overall bit performance. A given amount of weight is put on the bit and the drawworks brake is tied off so that no more weight is applied to the bit as it drills. The time it takes for the bit to stop drilling ahead with the given amount of weight is measured. Different weights are applied and the times are compared to determine which amount is best.

n: a method of testing drilling to define the rotate speed and the
pressure under which the speed is the fast and the

n: 1. a device used with mechanical drawworks brakes to ensure that, when the brakes are used, each brake band will receive an equal amount of tension and also that, in case one brake fails, the other will carry the load. A mechanical brake equaliser is a dead anchor attached to the draw works frame in the form of a yoke attached to each brake band. Some drawworks are equipped with automatic equalisers. 2. any device used to distribute force equally on two pieces of equipment-for example, the pitmans on a beam pumping unit.

n: refer toequalizer bar