Methods and materials for reducing lost circulation in a wellbore
US11414971B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Dec 4, 2020 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Dec 4, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of reducing lost circulation in a wellbore includes introducing a fluid including a fluid loss control additive comprising shape memory polymer, shape memory alloy, or both into the wellbore. The method further includes allowing the fluid loss control additive to lodge within fractures within a subsurface formation in the wellbore. The method further includes allowing the fluid loss control additive to expand within the fractures, thereby forming a barrier between the wellbore and the subsurface formation to reduce lost circulation in the wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.