Double-chamber microcapsule for drilling fluid and self-reversing reversible water-in-oil drilling fluid and preparation method thereof
US11993743B2 · kind B2 · utility
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Key dates
| Filing date | Jun 2, 2023 |
| Grant date | May 28, 2024 |
| Priority date | — |
| Expiry date | Jun 2, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A double-chamber microcapsule includes a capsule core and a microcapsule wall encapsulating the capsule core, wherein the microcapsule wall is a thermo-sensitive polymer encapsulating the content of a second chamber; the capsule core is a pH responsive polymer encapsulating the content of a first chamber, the pH responsive polymer is obtained by polymerizing a pH responsive monomer and a cross-linking monomer; the content of the first chamber is different from the content of the second chamber, each is selected from a solid acid or a solid alkali.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.