Composite oil displacement system and preparation method thereof
By combining polyacrylamide and viscoelastic in a composite oil displacement system, the problems of small coverage and high cost of existing oil displacement systems are solved, achieving low-cost and high-efficiency oil displacement in old oilfields with high water cut.
Patent Information
- Application Number
- CN202411559093.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, polymer flooding systems have a small impact range and high cost. Although polymer/surfactant flooding systems can improve oil recovery, they are also expensive and difficult to achieve low-cost and efficient oil displacement in old oilfields with high water cut.
A composite oil displacement system is adopted, which includes polyacrylamide and viscoelastic. Viscoelastic is prepared through polymerization reaction, and the thickening and suspending ability of polyacrylamide is used to carry the viscoelastic to form a heterogeneous composite system, which increases the swept volume and viscoelasticity, improves the recovery rate and reduces costs.
By increasing the viscosity of polyacrylamide by 1 to 2 times, the oilfield recovery rate is improved, the cost is reduced by about 55%, and it can adapt to the reservoir temperature and salinity environment, with a viscosity retention rate of over 80%, thus achieving low-cost and high-efficiency oil displacement.