What is a rotary table on an oil rig?

What is a rotary table on an oil rig?

A rotary table is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the drill string to facilitate the process of drilling a borehole.

What are the two rotating systems used in the drilling rigs?

Two types of circulation techniques can be used for either a mud drilling system or an air or gas drilling system. They are direct (conventional) circulation and reverse circulation.

How many degrees can a rotary table turn rotary?

Each complete rotation of the crank moves the table 1/72 of a full rotation (5 degrees). For smaller increments there are two rings of holes on the dividing plate. The outer ring has 28 equally spaced holes and the inner ring has 15 equally spaced holes.

What are the two main types of rotary table?

Below we’ve put together a brief guide of some of the main types of rotary tables.

• WORM DRIVE TABLE. This is a good starting table.
• BALL DRIVE TABLE. Unlike the worm drive, these tables have zero backlash and maintenance, higher speed indexing, higher accuracy, and higher rigidity.
• DIRECT DRIVE TABLE.
• BIG BORE TABLE.

What is a Kelly in oilfield?

1. n. [Drilling] A long square or hexagonal steel bar with a hole drilled through the middle for a fluid path. The kelly is used to transmit rotary motion from the rotary table or kelly bushing to the drillstring, while allowing the drillstring to be lowered or raised during rotation.

What are the two function of the rotary table?

A rotary table can be used: To machine spanner flats on a bolt. To drill equidistant holes on a circular flange. To cut a round piece with a protruding tang.

When should a rotary table be used?

A rotary table is a precision device that is ideal for work positioning. Such table is used in metal works as it makes the job of drilling easier for the metal worker. Other than this, the metal worker can also cut the piece on fixed axes during specific interval with the help of a rotary table.

What are the main components of the rotary system?

The main part of the rotary system are as follows: Swivel, Rotary hose, Kelly, Rotary drive (master pushing, kelly pushing), Rotary table and Drilling string.

How do I choose a rotary table?

There are multiple factors to consider when choosing a rotary table, such as the make and model of the machining center, size, and weight of the part, and most importantly the goal of the end user.

What is the difference between rotary table and top drive?

A rotary table is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the drill string to facilitate the process of drilling a bore while the top drive is a motor that is suspended from the derrick, or mast of the rig to facilitate the rotation of the drill string.

What is the difference between Kelly and top drive?

This means that Top Drives can drill about 90 feet before making a connection, whereas with a Kelly System, you will make a connection at about 30 feet deep. Another difference between a Kelly and a Top Drive is that a Top Drive System allows rotation and circulation while back reaming out of a hole.

Which one is a part of rotary drilling system?

The basic rotary drilling system consists of four groups of components – the prime movers, hoisting equipment, rotating equipment and circulating equipment – that all combine to make rotary drilling possible.

What is the kelly bushing?

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 are the two types of rotary tables?

Mounting styles for rotary tables can be horizontal, vertical, or inverted. With horizontal mounting, the table surface is in a flat, upright, horizontal position. With vertical mounting, rotary tables are mounted so the rotary table surface runs up and down.

What is the main advantage of using the top drive system instead of using the rotary table kelly system?

Top drive drilling has led to overall improved efficiency in drilling operation. It has led to reduction in drilling downtime caused by picking up and racking back the swivel and Kelly when tripping in or out of hole, drilling of mouse and rat hole, drilling using singles in the case of rotary table.