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US 2016/0237750 A1Published application
Bottom Hole Assembly Retrieval for Casing-While-Drilling Operations Using a Tethered Float Valve
AssigneeHalliburton Energy Services, Inc.
InventorsAnkit Purohit, Anand Bhagwat Kedare, Bhargav Gajji, Sanjay Sawant
Life of this patent
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Abstract
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.
Claims20
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.
3 more elements
A method for performing a casing-while-drilling operation, the method comprising:
- drilling a wellbore with a bottom hole assembly comprising:
- one or more casing joints forming a casing string;
- an elongated drum secured within the casing string;
- a tether wrapped around the drum and connected to the drum;
- a float valve positioned above the drum, the float valve being connected to the tether;
- and
- a drilling assembly positioned below the drum;
- reaching a desired depth within the wellbore;
- releasing the drum from the casing string;
- forcing the float valve up the wellbore, the float valve remaining attached to the drum via the tether;
- and
- retrieving the drum and drilling assembly from the wellbore using the tether.
9 more elements
A method for performing a casing-while-drilling operation, the method comprising:
- deploying a bottom hole assembly into a wellbore, the bottom hole assembly comprising:
- one or more casing joints forming a casing string;
- a drum secured within the casing string;
- a float valve positioned above the drum;
- and
- a tether coupling the drum to the float valve;
- releasing the drum from the casing string;
- forcing the float valve up the wellbore, the float valve remaining attached to the drum via the tether;
- and
- retrieving the drum and drilling assembly from the wellbore using the tether.
7 more elements
Dependencies are inferred from the claim text.