Compound oil-displacing agent for high temperature reservoir and compound oil-displacing system

A technology for composite flooding and high temperature oil, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature resistance and cannot be used effectively in oil reservoirs, and achieves delayed demulsification and good solubilization of oil and water. The effect of strong ability to solubilize oil and water
CN105038752AActive Publication Date: 2015-11-11CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2015-11-11

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Abstract

The invention discloses a compound oil-displacing agent for a high temperature reservoir and a compound oil-displacing system. The compound oil-displacing agent is prepared from the following components in parts by mass: 5-15 parts of polymer, 40-100 parts of negative and non-ionic compound surfactant and 50-200 parts of NaCl. After the compound oil-displacing agent is mixed with water, the compound oil-displacing system capable of forming micro emulsion in a high temperature reservoir is formed; the compound oil-displacing system can act with crude oil to form stable micro emulsion and has the characteristics of strong oil-water solubilizing capability and ultra-low interface tension; the oil-displacing system is capable of resisting temperature of 105 DEG C, has good long-term thermal stability and good injectivity, and can obviously improve the recovery efficiency; and the oil-displacing agent is suitable for a high temperature reservoir of which the reservoir temperature is 80-105 DEG C, the permeability rate is equal to or higher than 200*10<-3>mu m<2> and the salinity is 0-100000mg / L, and the crude oil recovery ratio is improved.
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Description

technical field

[0001] The invention belongs to the technical field of compound oil displacement in oil fields, and in particular relates to a composite oil displacement agent and a composite oil displacement system for high-temperature oil reservoirs. Background technique

[0002] In China, the chemical flooding resources in Shengli Oilfield are 16.05Γ—10 8 t, where the geological reserves of high temperature (temperature: 80-120Β°C) reservoirs are 5.1Γ—10 8 t, accounting for 31.8% of the total reserves. The chemical flooding resources in Henan Oilfield are 15.93Γ—10 7 t, of which the high-temperature (temperature: 80-102Β°C) oil reservoir geological reserves are 5.78Γ—10 4 t, accounting for 36.2% of the total reserves, the reserves of high-temperature oil reservoirs are large. As the development of existing oilfields gradually enters the period of medium-high water cut, the situation of "stabilizing water and controlling oil" is very severe, and the development of high-tempe...

Claims

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