Phase change microcapsule for drilling fluid cooling and its preparation method and application
US12378458B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2024 |
| Grant date | Aug 5, 2025 |
| Priority date | — |
| Expiry date | Jun 25, 2044 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A phase change microcapsule for drilling fluid cooling and its preparation method and application, belonging to the field of oilfield chemistry technology; the preparation method of the phase change microcapsule of the invention includes the steps as follows: the core materials of NaNO3 and KNO3 are dried, heated, melted, cooled and ground to obtain a phase change material mixture; added emulsifier into the linseed oil, then heated and stirred to obtain the oil phase; the phase change material mixture were added into the suspension of cellulose nanofibers (CNFs), then stirred followed by adding ammonium hydroxide to obtain the water phase; mixed the water phase with the oil phase, heated and stirred to form water-in-oil (W/O) emulsion; then added shell prepolymer material (tetraethyl silicate) into the emulsion, after centrifugation, washing and drying, the phase change microcapsule for cooling drilling fluid was obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.