Method for preparation of biomimetic polymer for stabilizing wellbore and drilling fluid
US9410068B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Sep 23, 2015 |
| Grant date | Aug 9, 2016 |
| Priority date | — |
| Expiry date | Oct 9, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L51/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a biomimetic polymer for stabilizing wellbore, a method for preparation of the biomimetic polymer, and a drilling fluid. The polymer contains carboxymethyl chitosan that serves as a backbone and dopamine-derived groups grafted on the backbone. The polymer provided in the present invention can improve the strength of shale in the wellbore, seal the shale pores and reduce the filter loss of drilling fluid, and thereby attains an effect of stabilizing the wellbore in shale formation in drilling process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.