Polymer system for fluid loss control
US10280354B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Aug 4, 2016 |
| Grant date | May 7, 2019 |
| Priority date | — |
| Expiry date | Oct 12, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/512
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A combination of three polymers including a crosslinked acrylamide-TBAS copolymers in inverse emulsion form, N-vinyl pyrrolidone-acrylamide-TBAS terpolymer, and crosslinked N-vinyl pyrrolidone-acrylamide-TBAS acts as high temperature, high pressure fluid loss control additives for water-based drilling fluids systems. The combination is particularly useful for high salt, high density drilling fluids, and high temperature applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.