Multi-component complex system nano oil displacement agent, preparation method and application thereof
By forming a nano-microemulsion using a multi-component compound system of nano-displacement agents, the problem of low oil displacement efficiency in low-permeability reservoirs is solved, achieving efficient and environmentally friendly oil displacement effects.
CN117946648BActive Publication Date: 2026-07-24CHINA PETROLEUM & CHEMICAL CORP +1
1 Cites 0 Cited by
Patent Information
- Application Number
- CN202211323466.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-27
- Publication Date
- 2026-07-24
- Estimated Expiration
- 2042-10-27
AI Technical Summary
Technical Problem
Conventional oil displacement agents are difficult to effectively improve oil recovery in low-permeability reservoirs, and nanoparticles are prone to agglomeration, making it difficult to achieve ultra-low oil-water interfacial tension.
Method used
The multi-component compound system of nano-displacement agent, containing anionic surfactants and co-surfactants, forms a nano-microemulsion with extremely low interfacial tension and strong solubilization ability, making it suitable for low-permeability reservoirs.
Benefits of technology
It forms ultra-low interfacial tension under alkali-free and high-temperature conditions, which improves crude oil recovery, reduces formation and well damage, and meets environmental protection requirements.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention discloses a multi-component compound system of nano-oil displacement agent, its preparation method, and its application. The multi-component compound system of nano-oil displacement agent comprises anionic surfactant and co-surfactant; the anionic surfactant is at least one compound having the general formula shown in formula (I): R1-Indole-O-(PO). n (EO) m CH2COOMa formula (I), where R1 is C1~C 20 The hydrocarbon group; n is any integer from 0 to 20; m is any integer from 0 to 30; and m and n are not both 0; M is an alkali metal or an alkaline earth metal, where a is 1 when M is an alkali metal and 0.5 when M is an alkaline earth metal; the co-surfactant is selected from at least one of zwitterionic surfactants and cationic surfactants. This multi-component compound system of nano-oil displacement agent can form nano-microemulsions with extremely low interfacial tension, strong solubilization ability, and micelle size reaching the nanoscale. It has strong anti-adsorption ability in formations and is suitable for low-permeability reservoirs with harsh conditions.
Need to check novelty before this filing date? Find Prior Art