Amphiphilic block copolymer surfactant for attenuating acid reactivity during acid stimulation of carbonate rich reservoirs
US11781057B2 · kind B2 · utility
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Key dates
| Filing date | Oct 29, 2021 |
| Grant date | Oct 10, 2023 |
| Priority date | — |
| Expiry date | Oct 29, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/32
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition for treating a formation includes a surfactant including an amphiphilic block copolymer having a first block and a second block and an acid. The amphiphilic block copolymer is a reaction product of a first monomer and a second monomer via a reversible addition-fragmentation chain transfer polymerization (RAFT) in a two-step reaction using a chain transfer agent (CTA) and a radical initiator. The surfactant favors adsorption onto a surface of the formation such that a temporary barrier is formed, thereby attenuating a reaction rate between the acid and the formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.