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Cation dual surface active agent capable of using displacement agent

A technology of surfactant and gemini surface, applied in drilling equipment, etc., can solve the problems of reduced oil displacement efficiency, increased expansion of clay minerals, enhanced water sensitivity, etc., to overcome the decline of oil displacement efficiency and ultra-low oil-water interfacial tension , The effect of reducing the cost of oil displacement

Inactive Publication Date: 2004-09-15
SOUTHWEST PETROLEUM UNIV
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AI Technical Summary

Problems solved by technology

However, the addition of alkaline agent will increase the pH value, which will increase the expansion of clay minerals and enhance water sensitivity, and the interaction between petroleum sulfonate and exchangeable high-valent cations in formation water and clay will form sulfonate precipitation, which will accumulate in the formation. Scale, etc., thus causing greater damage to the formation, seriously affecting the sustainable development of oil
Moreover, the consumption of sodium hydroxide is generally all higher, which also increases the cost of oil extraction and affects the economic benefits of oil extraction.
In addition, since the compound is a mixture, when the multi-component system flows in the oil layer, chromatographic separation may occur between the components of the oil displacement agent, which will destroy the integrity of the original formula system, thus making the formed ultra-low interface Tension disappears, so that the oil displacement efficiency is reduced

Method used

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  • Cation dual surface active agent capable of using displacement agent
  • Cation dual surface active agent capable of using displacement agent
  • Cation dual surface active agent capable of using displacement agent

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Experimental program
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Embodiment Construction

[0024] Measured condition 1:

[0025] 1. Test instrument: 500 type spinning drop interfacial tensiometer

[0026] 2. Temperature: 45°C

[0027] 3. Crude oil: experimental standard crude oil

[0028] 4. Water: formation water

[0029] 5. Composition of oil displacement agent: 16-3-16

[0030] Oil displacement agent concentration (w%)

[0031] Measured condition 2:

[0032] 1. Test instrument: 500 type spinning drop interfacial tensiometer

[0033] 2. Temperature: 45°C

[0034] 3. Crude oil: experimental standard crude oil

[0035] 4. Water: formation water

[0036] 5. Oil displacement agent composition: 12-2-12(50%)+16-4-16(50%)

[0037] Oil displacement agent concentration (w%)

[0038] Measured condition 3:

[0039] 1. Test instrument: 500 type spinning drop interfacial tensiometer

[0040] 2. Temperature: 45°C

[0041] 3. Crude oil: experimental standard crude oil

[0042] 4. Water: formation water

[0043] 5. Oil displacement agent compositi...

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Abstract

The invention refers to a kind of positive ion double surface activating agent in third petroleum production chemical oil-displacing agent, who is expressed by m-s-m, m represents the carbon atom quantity of activating agent alkyl radical, s represents the carbon atom of chain connection radical. S=2, 3, 4, 5, 6, m=10, 12, 14, 16, 18, the activating agent can be used singly, it also can be used with other surface activating agent. It needn't add in alkali, thus it is harmless to formation, it saves oil exploit cost, and it is stable, it has excellent property for decreasing the tension of oil / water interface, and overcomes that current oil-displacing agent induces the oil displacing efficiency falling because of the color spectrum detachment phenomenon.

Description

technical field [0001] The invention relates to a cationic gemini surfactant which can be used as a chemical oil displacement agent for tertiary oil recovery. Background technique [0002] Many oilfields in our country have entered the late stage of development one after another, and the application of tertiary oil recovery technology has been widely valued. At the end of waterflood development, residual oil is distributed in the pores of reservoir rocks in a static spherical shape. Reducing interfacial tension is the only way to force the residual oil trapped in porous media to flow, and it is also an effective way to greatly improve oilfield production efficiency. The oil displacing agent must reduce the oil-water interfacial tension to 10 -3 mN / m or lower order of magnitude, otherwise there will be no practical value. It is difficult to reduce the oil-water interfacial tension to 10 due to simple surfactants -3 mN / m, therefore, most of the surfactants currently used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 陈洪韩利娟罗平亚
Owner SOUTHWEST PETROLEUM UNIV
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