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About: Bottom hole assembly     Goto   Sponge   Distinct   Permalink

An Entity of Type : dbo:MilitaryUnit, within Data Space : dbpedia.org associated with source document(s)

Type: military unit New Facet based on Instances of this Class

A bottom hole assembly (BHA) is a component of a drilling rig. It is the lowest part of the drill string, extending from the bit to the drill pipe. The assembly can consist of drill collars, subs such as stabilisers, reamers, shocks, hole-openers, and the bit sub and bit. Prior to running a BHA most oilfield service providers have software to model the BHA behaviour such as the maximum WOB achievable, the directional tendencies & capabilities and even the natural harmonics of the assembly as to avoid vibration brought about by exciting natural frequencies.