دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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 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 place at each end of the drawworks drum where the drilling line being spooled onto or off of the drum stops moving in one direction and starts moving in the other direction. Also called turn back. crossover joint n: a length of casing with one thread on the field end and a different thread in the coupling, used to make a changeover from one thread to anod1er in a string of casing.

n: A sub that is used to connect drill string components that have different threads or sizes.

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 first of several wraps of wire rope around the drawworks drum that will never be played out (unspooled) as the rope moves off the drum.

n: The first rope twisted in the drum spool.

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

n: the spool-shaped cylinder in the drawworks around which drilling line is wound, or spooled.

n: refer to drum

n: a receptacle on the drawworks drum to which the drilling line is attached.

n: the rosette of the winch drum on which the steel wire is fixed

n: 1. a cylinder around which wire rope is wound in the drawworlcs. The drawworks drum is that part of the hoist on which the drilling line is wound. 2. a steel container of general cylindrical form. Some refined products are shipped in steel drums with

n: the cylinder on the winch used to wind the wire rope,steel wire and cable

n: in the drawworks, the axle on which the drawworks drum rotates. See drawworks.