What is Kelly bar in piling rig?
Kelly bars are key components in the execution of boreholes with hydraulic rotary drilling rigs. They transfer the torque of the rotary drive and the crowd pressure of the crowd system concurrently to the drilling tool. Kelly bars are key components in the execution of boreholes with hydraulic rotary drilling rigs.
How is a kelly bar used?
Kelly bars (also called grief joints, kelly joints and kelly stems) are used during the execution of boreholes by hydraulic rotary drilling rigs. The bars themselves are hollow and attach to the top of the drill column.
What is friction kelly bar?
Friction type drill Kelly bar is a kind of drill pipe type with international advanced six-ribs distribution technology composition. The Kelly bar can generate pressure force when the Kelly bar rotarying can produce peripheral force and the rotary passing down the pressure force can produce the friction force.
What is a Kelly rod?
A kelly drive is a type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal (three-, four-, six-, or eight-sided) or splined outer surface, which passes through the matching polygonal or splined kelly (mating) bushing and rotary table.
How long is a Kelly drilling?
about 40 ft
The Kelly is about 40 ft in length with a square or hexagonal shape and it is hollow throughout in order to transport the drilling mud. Kelly moves freely through a Kelly bushing even though the drill stem is rotated.
What is a Kelly spinner?
A mechanical device for rotating the kelly. The kelly spinner is typically pneumatic. It is a relatively low torque device, useful only for the initial makeup of threaded tool joints. It is not strong enough for proper torque of the tool joint or for rotating the drillstring itself.
What is kelly bushing elevation?
Kelly Bushing Height (KB): The height of the drilling floor above the ground level. Many wellbore depth measurements are taken from the Kelly Bushing. The Kelly bushing elevation is calculated by adding the ground level to the Kelly bushing height.
What is a Topdrive in drilling?
1. n. [Drilling] A device that turns the drillstring. It consists of one or more motors (electric or hydraulic) connected with appropriate gearing to a short section of pipe called a quill, that in turn may be screwed into a saver sub or the drillstring itself.
How much weight can a top drive hoist?
Top Drive System Product Models
| Product model | Hoisting capacity | Maximum continuous torque |
|---|---|---|
| HPS-03-1000 | 1,000 tons | 78,181 ft-lb (106 000 Nm) |
| HPS-750 | 750 tons | 78,181 ft-lb (106 000 Nm) |
| TDS-8SA | 750 tons | 62,250 ft-lb (84 399 N-m) |
| TDS-4S | 750 tons | 45,500 ft-lb (61 689 N-m) |
What is the function of the kelly bushing?
Kelly bushing is that elevated device positioned right on top of the rotary table and used to transmit torque from the rotary table to the kelly. The kelly bushing is designed to be the connection between the rotary table and the kelly. The kelly is a 4 or 6 sided steel pipe.
What is kelly bushing in oilfield?
1. n. [Drilling] An adapter that serves to connect the rotary table to the kelly. The kelly bushing has an inside diameter profile that matches that of the kelly, usually square or hexagonal. It is connected to the rotary table by four large steel pins that fit into mating holes in the rotary table.
What is Drawworks in drilling rig?
The drawworks is a part of the system that rotary drilling rigs use for hoisting, or lifting, the drill stem and casing out of the hole. A compounding transmission, or compound, sends power from the engines to the drawworks, the rotary table, and the mud pumps.
What is the function of kelly bushing?
What is Cathead in drilling?
1. n. [Drilling] A clutched spool connected to the drawworks power system used to tension chains, cables, and softline rope.
What is mud pump in drilling?
A mud pump (sometimes referred to as a mud drilling pump or drilling mud pump), is a reciprocating piston/plunger pump designed to circulate drilling fluid under high pressure (up to 7,500 psi or 52,000 kPa) down the drill string and back up the annulus.
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.
How many types of mud pumps are there?
However, mud pumps tend to be one of two main types: the duplex and the triplex. The duplex mud pump features two pistons (or plungers) in constant action to move the fluid.
What is cat the anchor?
Dictionary of Nautical Terms cat the anchor. When the cat is hooked and “cable enough” veered and stoppered, the anchor hangs below the cat-head, swings beneath it; it is then hauled close up to the cat-head by the purchase called the cat-fall. The cat-stopper is then passed, and the cat-block unhooked.
Where did the term cat head biscuit come from?
Cat Head Biscuits are so named because they are as big as a cat’s head. This is another one of my favorite recipes from America’s Test Kitchen. Normally southern biscuits are made with a low protein flour such as White Lily or Martha White.
How do you calculate the pressure of a mud pump?
Pump Pressure and Pump Stroke Relationship
- New circulating pressure in psi = present circulating pressure in psi x (new pump rate in spm ÷ old pump rate in spm) 2
- Example: Determine the new circulating pressure, psi using the following data:
- Factor (n) = log (pressure 1 ÷ pressure 2) ÷ log (pump rate 1÷pump rate 2)
What is mud pump in rig?
Why is it called a cathead?
Nautical author Robert Charles Leslie, writes: “The term catheads used for the two stout projecting timbers on either bow, from which the anchor hung clear of the ship before letting go, was no doubt connected with the fact of a lion or large cat usually carved upon the end of the item.”