You must log in to edit PetroWiki. Help with editing
Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such content. More information
Enlarge an existing borehole by a special bit that opens to a diameter larger than running diameter by hydraulic or mechanical method, or by use of a bi-center bit.
We are grateful to our generous sponsors for their assistance in building and supporting PetroWiki.