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US 12,312,905 B2Granted
Methods, apparatus and systems for creating wellbore plugs for abandoned wells
AssigneeSchlumberger Technology Corporation
InventorsTerizhandur S. Ramakrishnan, Hua Zhang, Quincy K. Elias, Albert Perez, Jr.
Life of this patent
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Abstract
A wellbore is plugged using a bismuth alloy. The wellbore is arranged so that a liquid bismuth alloy sets with an excess pressure of the plug relative to the borehole fluid pressure along a desired seal height distance.
Claims10
A formation plug formed in situ in a wellbore traversing a formation, comprising:
- a solid bismuth alloy material having a solid first cylindrical body portion;
- a solid second cylindrical body portion of smaller diameter than the first cylindrical body portion;
- a shoulder being defined at a transition from said first cylindrical body portion to said second cylindrical body portion;
- and
- at least one continuous thread extending around and running along the first cylindrical body portion to the top of the first cylindrical body portion,
- wherein the body portions, the shoulder, and the at least one continuous thread interface with a wall of the wellbore to form a seal with the wellbore and prevent displacement of said plug under differential pressures.
3 more elements
Dependencies are inferred from the claim text.