Wellbore casing while drilling with drilling jar
AssigneeSaudi Arabian Oil Company
InventorsBandar S. Malki, Vitalii Chereshniuk
Life of this patent
Estimating the term…
Abstract
A well tool assembly includes a first well tool and a second well tool. The first well tool includes a first casing, a first drill bit and a drilling jar. The first drill bit is configured to drill through a subterranean zone to form a wellbore. The drilling jar is axially coupled to the casing uphole of the first drill bit. The drilling jar has an outer diameter that is greater than an outer diameter of the first casing. The second well tool has a second casing and a second drill bit. The second casing has an outer diameter that is smaller than an inner diameter of the drilling jar. The second drill bit has an outer diameter that is smaller than the inner diameter of the drilling jar.
Claims14
A method comprising:
- forming a wellbore through a subterranean zone from a surface of the Earth using a first well tool comprising:
- a first casing,
- a drilling jar axially coupled to the first casing, the drilling jar comprising an outer diameter that is greater than an outer diameter of the first casing, and
- a first drill bit configured to drill through the subterranean zone to form the wellbore;
- in response to determining that the first casing is stuck within the subterranean zone, activating the drilling jar to release the first casing;
- after the first casing is released, continuing to form the wellbore using the first well tool;
- while retaining the first well tool within the wellbore, cementing the wellbore by flowing cement in an annular region formed between an inner wall of the wellbore and an outer surface of the wellbore;
- and
- after cementing the wellbore, lowering a second well tool through the first well tool, the second well tool comprising:
- a second casing having an outer diameter that is smaller than an inner diameter of the first casing;
- and
- a second drill bit configured to drill through the subterranean zone, the second drill bit having an outer diameter that is smaller than an inner diameter of the drilling jar.
A method comprising:
- while forming a wellbore through a subterranean zone from a surface of the Earth using a first well tool comprising:
- a first casing,
- a drilling jar axially coupled to the first casing, the drilling jar comprising an outer diameter that is greater than an outer diameter of the first casing, and
- a first drill bit configured to drill through the subterranean zone to form the wellbore, determining that the first casing is stuck within the subterranean zone;
- in response to determining that the first casing is stuck within the subterranean zone, activating the drilling jar to release the first casing;
- after the first casing is released, while retaining the first well tool within the wellbore, cementing the wellbore by flowing cement in an annular region formed between an inner wall of the wellbore and an outer surface of the wellbore;
- and
- after cementing the wellbore, continuing to form the wellbore using a second well tool lowered into the wellbore through the first well tool, the second well tool comprising:
- a second casing having an outer diameter that is smaller than an inner diameter of the first casing;
- and
- a second drill bit configured to drill through the subterranean zone, the second drill bit having an outer diameter that is smaller than an inner diameter of the drilling jar.
A well tool assembly comprising:
- a first well tool comprising:
- a first casing,
- a first drill bit configured to drill through a subterranean zone to form a wellbore,
- a drilling jar axially coupled to the casing uphole of the first drill bit, the drilling jar comprising an outer diameter that is greater than an outer diameter of the first casing;
- and
- a second well tool comprising:
- a second casing having an outer diameter that is smaller than an inner diameter of the drilling jar;
- and
- a second drill bit having an outer diameter that is smaller than the inner diameter of the drilling jar.
Dependencies are inferred from the claim text.