Swivel ( drilling rig ) – Readyzone




TheĀ swivel performs three functions: (1) it suspends the Kelly and drill string; (2) it permits free rotation of the Kelly and drill string; and (3) it provides a connection for the rotary hose and a passageway for the flow of drilling fluid into the top of the Kelly and drill string. Accordingly, the chief operating parts of the swivel are a high-capacity-thrust bearing, which is often the tapered roller bearing design, and a rotating fluid seal consisting of rubber or fiber and metal rings which form a seal against the rotating member inside of the housing. The fluid seal is suspended by its bail from the hook of the traveling block. The fluid entrance at the top of the swivel is a gently curving tube, which is referred to as the goosenech, which provides a down-ward-pointing connection for the rotary hose. In this manner the rotary hose is suspended between the upper nonrotating housing of the swivel and the stand pipe, which extends part way up the derrick and conveys mud from the mud pump. The fluid passageway inside of the swivel is commonly about three or four inches in diameter so that there is no restriction to mud flow. The lower end of the rotating member of the swivel is furnished with left-hand threads of API tool-joint design.

Swivels are furnished by the several manufacturers in various load capacities. Since the load-capacity reqirement is determined largely by the weight of the drill string, rigs capable of deep drilling operation require swivels of greater capacity than rigs used in shallower drilling.

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Reference : Mc Cray & Cole, Oil Well drilling Technology, New India Publication.

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