Polyaminopolyamide-epichlorohydrin resins for use as clay and shale inhibition agents for the drilling industry
US9631131B2 · kind B2 · utility
7Cited by
14References
12Claims
0Family size
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Key dates
| Filing date | Jan 27, 2014 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | Jan 27, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The hydration of clays and shale in drilling operations may be inhibited by employing an aqueous based drilling fluid comprising a shale hydration inhibition agent comprising a polyaminopolyamide-epichlorohydrin resin, preferably the polyamino polyamide-epichlorohydrin resin is a reaction product of an aliphatic polyamine, an aliphatic polycarboxylic acid, and epichlorohydrin. The shale hydration inhibition agent should be present in the aqueous based drilling fluid in sufficient concentration to reduce the reactivity, such as swelling, of clays and shale when exposed to water-based drilling fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.