Method for plugging and abandoning oil and gas wells
US11499083B2 · kind B2 · utility
0Cited by
3References
6Claims
0Family size
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Key dates
| Filing date | Oct 23, 2020 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | Oct 23, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/0008
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method and agent to induce accelerated creep deformation of shale rock formations in the annular gap between a shale formation and non-cemented sections of a casing string have been developed. A fluid containing alkali silicate or a modified alkali silicate is added to the annular space between the shale rock formation and the casing string. The alkali silicate promotes creep deformation of the shale rock, effectively closing the annulus surrounding the casing. It has been found lithium silicate provides the strongest shale-casing bond and is the presently preferred material for closing abandoned wells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.