Methods of controlling water production from hydrocarbon bearing subterranean formations using dense carbon dioxide compositions
US11578572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2020 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Mar 11, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for reducing water production from a hydrocarbon bearing subterranean formation includes identifying a high permeability zone in the formation and injecting a dense CO2 composition from a production well into the high permeability zone. The dense CO2 composition includes dense CO2 and a thickener soluble in the dense CO2. The thickener includes a copolymer that is the polymerized reaction product of monomers that include at least one alkenyl ether or dialkenyl ether monomer, at least one acrylate or methacrylate monomer, at least one structural monomer, and at least one allyl ester monomer. After injecting the dense CO2 composition into the high permeability zone, the method includes withdrawing hydrocarbons from the hydrocarbon bearing subterranean formation through the production well. The dense CO2 composition blocks pores in the high permeability zone to reduce or prevent flow of water from the high permeability zone into the production well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.