Displacement system suitable for strong heterogeneous oil reservoir and its application
US12152192B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2024 |
| Grant date | Nov 26, 2024 |
| Priority date | — |
| Expiry date | May 14, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/594
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A displacement system designed for robust heterogeneous oil reservoirs and its application within the oil exploitation field. System comprises a polymer-enhanced foam plugging agent and an active polymer flooding agent. Plugging agent consists of 0.12% bio-polysaccharide polymer diutan gum foam stabilizer and 0.4% α-olefin sulfonate foaming agent by mass. The active polymer flooding agent is formulated through free radical polymerization, with components comprising a total monomer concentration of 27.5%, wherein monomer A to monomer B ratio is 7.5:2.5, monomer C constitutes 5.5% of the total monomer concentration, and water comprises the remaining. Monomer A is acrylamide, monomer B is 2-acrylamide-2-methyl propane sulfonic acid, and monomer C is a quaternary ammonium salt type active monomer. Demonstrated through parallel core displacement experiments, this displacement system exhibits effective displacement in heterogeneous oil reservoirs with a permeability gradation of 30 at 65° C., significantly enhancing oil recovery rates in robust heterogeneous oil reservoirs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.