Viscoelastic nano-magnetic fluid for improving crude oil recovery ratio of tight reservoir, and preparation method thereof

A technology of nano-magnetic fluid and tight reservoir, which is applied in the direction of nano-technology, mining fluid, and nano-technology for materials and surface science, can solve the problems of crude oil nano-magnetic fluid and preparation technology without tight reservoir, and achieve improvement The effect of oil recovery, strong stability and strong lipophilicity
CN110776898AActive Publication Date: 2020-02-11CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2020-02-11

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Abstract

The invention provides a viscoelastic nano-magnetic fluid for improving the crude oil recovery ratio of a tight reservoir, and a preparation method thereof. The viscoelastic nano-magnetic fluid is composed of surface modifier-modified Fe3O4 particles used as nano-magnetic particles and a viscoelastic surfactant solution used as a carrier liquid; the mass concentration of the surface modifier-modified Fe3O4 particles is 0.5-10 wt.%; and the viscoelastic surfactant solution is prepared by dissolving an anionic surfactant and a counter ion agent in water. The invention further provides the preparation method of the viscoelastic nano-magnetic fluid. The nano-magnetic fluid has the advantages of viscoelasticity, good stability, narrow particle size distribution, strong lipophilicity of the magnetic particles, strong magnetic response, cheap preparation raw materials and simple preparation process, is suitable for industrial production, and can be used in the field of tight reservoir crude oil exploitation to improve the crude oil recovery efficiency.
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Description

Technical field

[0001] The invention relates to a viscoelastic nano magnetic fluid used for improving the oil recovery rate of tight reservoirs and a preparation method thereof, and belongs to the technical field of material preparation. Background technique

[0002] In recent years, conventional oil and gas production has been unable to meet the continuous growth of demand for oil and gas resources in world development. Unconventional oil and gas resources have become the focus of global attention. The successful exploration and development of tight oil and gas has injected new vitality into the world’s energy resources. China has changed the world’s traditional energy pattern. China's tight oil resources are very rich, and they are China's actual oil replacement resources in the future. Due to the low permeability of tight reservoirs (underground overburden permeability is less than 0.1mD) and porosity (generally less than 10%), it is difficult to construct an effective displa...

Claims

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