Bottom Hole Assembly Retrieval for Casing-While-Drilling Operations Using a Tethered Float Valve

摘要

A bottom hole assembly for a casing-while-drilling operation utilizes a tethered float valve to retrieve the bottom hole assembly after the casing string has been positioned at a desired wellbore depth.

主权项

1. A bottom hole assembly for use in a casing-while-drilling operation, the assembly comprising:
one or more casing joints forming a casing string; an elongated drum secured along the casing string, the drum having a release mechanism to release the drum from the casing string; a tether wrapped around the drum; and a float valve positioned above the drum, wherein a first end of the tether is connected to the drum and a second end of the tether is connected to the float valve, thus allowing the float valve to be forced up a wellbore while still connected to the drum via the tether.