Bottom Hole Assembly

Published: March 30, 2017 | Last updated: July 5, 2023

What Does Bottom Hole Assembly Mean?

The bottom hole assembly is the lowest part of the drill attached to the end of a drill string. The assembly consists of the drill bit with collars that add weight and thus increase the force of the drilling action as well as high tech equipment to monitor the drilling and set the direction of the drill. The drill assembly cuts through the rock surface to deepen a well in oil and gas exploration.

Trenchlesspedia Explains Bottom Hole Assembly

A bottom hole assembly can be quite basic in design, consisting only of a drill bit, crossovers and collars or it may be more advanced, consisting of additional components like a mud motor and directional drilling and measuring equipment. Fluid (mud) is pumped through the bottom hole assembly to remove the debris as the drill bit cuts through the surface. Direction of drilling can be controlled through the assembly, which is attached via a drill string to the surface of the well. The bottom hole assembly is thus the key active component of drilling equipment used to create a well.

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