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US 10,871,051 B2Granted
System and method for drilling a wellbore portion in a subterranean formation
AssigneeShell Oil Company
InventorsDaniele Di Crescenzo, William Robert Portas
Life of this patent
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Abstract
A portion of a wellbore is drilled in a subterranean formation, using a drilling string (140) disposed within a casing string (130) and extending through a cement retainer (150) disposed within the casing string. The drilling string can be retracted into the casing string to a location fully above the cement retainer, and subsequently the casing string can be cemented in the wellbore whereby maintaining the drilling string inside the casing in the wellbore.
Claims10
A system comprising:
- a wellbore penetrating a subterranean formation;
- a casing string lining the wellbore whereby an annulus is defined between the wellbore and the casing string;
- a drilling string disposed within the casing string;
- and
- a bottom hole assembly attached to an end of the drilling string, wherein the bottom hole assembly comprises a drill bit;
- a cement retainer disposed within the casing string, wherein the drilling string is extendable through the cement retainer and retractable to a retracted position within the casing string and above the cement retainer;
- and
- unhardened cement disposed in the annulus while maintaining the drilling string and the drill bit within the casing string protected by a seal provided by the cement retainer which prevents cement from flowing upward back into the casing string, wherein the drilling string is in the retracted position within the casing string.
5 more elements
A method comprising:
- drilling a first portion of a wellbore with a drilling string disposed within a casing string and extending through a cement retainer disposed within the casing string, whereby a bottom hole assembly is attached to an end of the drilling string and comprises a drill bit;
- retracting the drilling string into the casing string to be above the cement retainer before cementing the casing string in the wellbore;
- and
- cementing the casing string in the first portion of the wellbore whereby maintaining the drilling string and the drill bit inside the casing string protected by a seal provided by the cement retainer which prevents cement from flowing upward back into the casing string.
1 more element
Dependencies are inferred from the claim text.