What is the function of draw works?
A drawworks is the primary hoisting machinery component of a rotary drilling rig. Its main function is to provide a means of raising and lowering the traveling block.
What is a draw works in drilling?
1. n. [Drilling] The machine on the rig consisting of a large-diameter steel spool, brakes, a power source, and assorted auxiliary devices. The primary function of the drawworks is to reel out and reel in the drilling line, a large diameter wire rope, in a controlled fashion.
How many clutches work in draw?
The EDSI/Ewbank Model M-75 drawworks is equipped with air clutches, all three on a secondary common shaft to take advantage of the chain ratio, plus all chains stand automatically still, reducing wear on machine and wear on the operator’s ears.
What is the traveling block in drilling?
A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section).
Why are disk brakes better than drum?
Disc brakes are better at managing and dispersing heat than drum brakes. This means that they experience less brake fade than drum brakes and offer a more consistent performance. This is because the disc is closer to the pads and expands even when the calipers are relaxed.
Which is better drum brake or disc brake?
Disc brakes are the more effective and reliable choice, but they have their limitations. Drum brakes are not very practical, but they are crucial to parking a car – unless of course you’d like to go back to wooden blocks on sticks. Therefore, drum brakes are often still found in modern cars.
Which material is used to prepare drill line of draw work?
steel
Drilling line is made by braiding together several strands of high-strength steel. From the drum, the line is run through the pulleys in the crown block and traveler block.
What is drill collar in drilling?
Drill collars are thick-walled tubulars that are used at the bottom of the drill string (see Figure 4-1). Their principal purpose in the drill string is to provide the axial force needed to advance the drill bit (see Figure 2-2). When drilling a vertical borehole, the axial force is the weight of the drill collars.
What is a Cathead on a ship?
A cathead is a large wooden beam located on either bow of a sailing ship, and angled outward at rougly 45 degrees. The beam is used to support the ship’s anchor when weighing or lowering it. Many had a cat’s or lion’s head carved on the seaward beam end.
What is the use of a dynamic drawworks in a drilling rig?
Drawworks is the core part of Drilling Rig. It is used for operation of lifting or laying down mast, hoisting or descending drilling tools and casings.
What type of brake is used in a single-shaft electric drawwork?
The main brake is hydraulic disc brake, and the auxiliary brake is electromagnetic eddy current brake or EATON brake. Technical Performances and Structure Features of the Single-shaft Electric Drawwork.
What are the characteristics of drawwork?
The drawwork is single-shaft with grooved drum structure, has less spare parts, small cubage, light weight compared with the products of the same kind. The drum shaft is driven by the gear reducer which power originate from a DC or AC-VF motor,it can also be driven by compound operation of two motors.
What is a disc brake system for a car?
A brake system for a drawworks includes a hydraulically actuated band brake system having a backup spring actuator for emergency stops. The system also includes a caliper disc brake system for emergency stops. The disc brake system includes a rotor directly mounted to the drum barrel and a pair of spring actuated caliper assemblies.