Method and apparatus for filling an annulus between casing and rock in an oil or gas well
US-2016237779-A1 · Aug 18, 2016 · US
Method for plugging and abandoning oil and gas wells
US11499083B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11499083-B2 |
| Application number | US-202016949283-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 23, 2020 |
| Priority date | Oct 24, 2019 |
| Publication date | Nov 15, 2022 |
| Grant date | Nov 15, 2022 |
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Abstract
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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.
First claim
Opening claim text (preview).
We claim: 1. A method for promoting creep deformation of shale surrounding a well casing comprising the step of introducing a lithium-based product in aqueous form into an annulus between said shale and said well casing, wherein said lithium-based product is one of lithium hydroxide, lithium carbonate, or lithium chloride, whereby said lithium-based product directly contacts the shale to promote the creep deformation of the shale, thereby sealing the annulus and creating an effective seal between the shale and the well casing. 2. The method of claim 1 wherein said lithium-based product is introduced in aqueous form. 3. The method of claim 1 wherein said lithium-based product further comprises lithium silicate. 4. The method of claim 1 wherein said creep deformation of the shale fully closes said annulus. 5. The method of claim 1 wherein said lithium-based product is added to sodium silicate. 6. The method of claim 5 wherein said lithium-based product further comprises a modified lithium silicate.
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Frequently asked questions
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- What does patent US11499083B2 cover?
- 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 t…
- Who is the assignee on this patent?
- Univ Texas, Pq Corp, Pq Llc
- What technology area does this patent fall under?
- Primary CPC classification E21B33/13. Mapped technology areas include Fixed Constructions.
- When was this patent published?
- Publication date Tue Nov 15 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).