bottom-hole assembly

bottom-hole assembly

[′bäd·əm ¦hōl ə‚sem·blē]
(petroleum engineering)
That portion of the drilling assembly that extends beyond the drill pipe.
References in periodicals archive ?
Currently picking up bottom-hole assembly, including log while drilling equipment ("LWD"), to drill ahead.
A wireline system will cost from $75,000 to $125,000, depending on the outside diameter size of the non-magnetic bottom-hole assembly and type of probe.
He says that the technological adaptation was made possible by careful analysis of bottom-hole assembly procedures in oil drilling, combined with an advanced computer modeling capability.
Gammaloy and Marlex rent and lease non-magnetic drill collars and other downhole tools used within the bottom-hole assembly, and provide manufacturing and support services for various downhole tools requiring high-precision machining.
Currently we are working to free the bottom-hole assembly prior to drilling ahead.
Having successfully commenced drilling the build-up section of the well, and having penetrated what appears to be a significant fracture in the reservoir, Weatherford encountered repeated problems with the bottom-hole assembly ("BHA") which ultimately resulted in the BHA detaching and being left in the hole.