Swivel

  1. Swivel overview

The swivel is the link between the rotation system of drilling machine, the lifting system and the circulation system, on the one hand, it bears all the weight of the drill column in the well, hangs drill column and ensures the free rotation of the drilling tool, and on the other hand, it is connected with the rotary hose, introduces the high pressure drilling fluid into the rotary drill stem to wash the well in the well bottom.

  1. Function and operation requirement of swivel

2.1 Swivel function: the rotary hanging drill stem bears a great amount of and all the weights of the drilling tool; it introduces high pressure drilling fluid into the rotary drill column and it is the intersection parts of three working units (lifting unit, rotating unit and circulation unit).

2.2 Operation requirements of swivel: the main bearing of the swivel must have sufficient strength and life; high pressure drilling fluid sealing system (or washing pipe assembly) must work reliably, have long life and quick and easy replacement and good oil seals; each bearing parts (including lifting loop, shell and central tube shall have sufficient strength and rigidity).

  1. Structure of swivel

Bearing system: central tube and joint, shell, pin roll, lifting loop and main bearing. The drilling tool in the well is added to the central tube through the kelly stem, and the central tube is on the shell by the main bearing seat and transfers the load to the hook through the pin and lifting loop.

Drilling fluid system: goose neck and wash hose assembly. The high pressure drilling fluid enters the wash hose through the goose neck, flows into the rotating central tube to reach the drill stem, and the upper and lower sealed boxes prevent the high pressure drilling fluid from leaking.

Auxiliary system: centralizer, anti-jump bearing and motor oil sealing box components. The centralizer and anti-jump bearing play a centralizing function on the central tube, ensure its stability, and limit the swing, in order to improve the working conditions of drilling fluid and machine oil sealing.