Multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof
US10865337B1 · kind B1 · utility
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19Claims
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Key dates
| Filing date | Nov 6, 2019 |
| Grant date | Dec 15, 2020 |
| Priority date | — |
| Expiry date | Nov 6, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to the field of drilling fluid, and provides a multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof, wherein the multi-functional weighting agent is an polyacrylamide/modified barium sulfate composite multi-functional weighting agent prepared by sequentially dropwise adding acrylamide and ammonium persulfate to a mixture of modified barium sulfate and deionized water in a presence of an initiator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.