Displacement agent for ultrahigh-temperature, high-salt, high-calcium, high-magnesium and homogeneous oil reservoirs

A high-temperature, high-salt, high-calcium-magnesium technology, applied in the field of oil-displacing agents, can solve problems such as weak resistance to temperature, salt, calcium and magnesium ions, achieve good temperature resistance, salt resistance, calcium and magnesium ions, reduce oil-water interfacial tension, The effect of improving wettability

Inactive Publication Date: 2012-06-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an oil displacement agent suitable for ultra-high-temperature, high-salt, high-calcium-magnesium homogeneous oil reservoirs in view of the reality that the existing surfactant flooding system is not strong in resistance to temperature, salt, and calcium and magnesium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Take 0.1g of 1,2-bis(sodium 2-oxypropylene sulfonate-3-decyl ether-propanyl) glycol ether, 0.05g of cetyl alcohol polyoxyethylene ether, 0.1g of absolute ethanol, Add to 99.75ml of mineralized water. Its total salinity is 55060 mg / L, and the ion composition of the mineralized water is: 15726mg / L Na + + 4000mg / L Ca 2+ + 100mg / L Mg 2+ +35234mg / L Cl - . Stir for 30 minutes to make it fully dissolved, and then a translucent oil-displacing agent without precipitation is obtained. The interfacial tension measured at 110°C is 3.5×10 -3 mN / m, wettability as spreading.

example 2

[0022] Take 0.15g of 1,2-bis(sodium 2-oxypropylenesulfonate-3-dodecyl ether-propanyl) glycol ether, 0.05g of nonylphenol polyoxyethylene ether, and 0.1g of absolute ethanol , added to 99.7ml of mineralized water. Its total salinity is 97838 mg / L, and the composition of mineralized water is: 31453mg / L Na + + 6000mg / L Ca 2+ + 300mg / L Mg 2+ +60085mg / L Cl - . Stir for 30 minutes to make it fully dissolved, and then a translucent oil-displacing agent without precipitation is obtained. The interfacial tension measured at 130°C is 2.9×10 -3 mN / m, wettability as spreading.

example 3

[0024] Take 0.1g of 1,2-bis(sodium 2-oxypropylenesulfonate-3-tetradecyl ether-propanyl) glycol ether, 0.1g of nonylphenol polyoxyethylene ether, and 0.1g of absolute ethanol, Add to 99.7ml of mineralized water. Its total salinity is 144179 mg / L, and the ion composition of the mineralized water is: 47179mg / L Na + + 8000mg / L Ca 2+ + 500mg / L Mg 2+ +88500mg / L Cl - . Stir for 30 minutes to make it fully dissolved, and then a translucent oil-displacing agent without precipitation is obtained. . The interfacial tension measured at 130°C is 4.5×10 -3 mN / m, wettability as spreading.

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Abstract

The invention relates to a displacement agent for ultrahigh-temperature, high-salt, high-calcium, high-magnesium and homogeneous oil reservoirs. Without alkali, the displacement agent can make the oil and water interface tension ultralow, namely the displacement agent can obviously reduce the oil and water interface tension in the oil reservoirs, thereby reducing capillary resistance, improving oil washing efficiency and largely improving extraction rate. The invention adopts a technical scheme that comprises: adding high-salt, high-calcium, high-magnesium imitation formation water or oil field formation water into a beaker; adding a certain amount of dialkyl ether bisulfonate surfactant, namely 1,2-bis(2-sodium oxypropylene sulfonate-3- alkyl ether-propyl)glycol ether, with stirring; then adding a certain amount of polyoxy ethrlene nonyl phinyl ether or fatty alcohol-polyoxyethylene ether; and finally adding a certain amount of absolute ethanol, dissolving for 30 minutes and obtaining the semi-transparent displacement agent. The displacement agent prepared by a simple method can provide the system with high interface activity and high temperature resistance, salt resistance and calcium and magnesium ion resistance and can be used in crude oil extraction in oil fields.

Description

technical field [0001] The present invention relates to a kind of temperature 100~130 ℃, mineralization degree 5~20×10 4 mg / L, in which the content of calcium and magnesium ions is 5~15×10 3 mg / L oil displacement agent suitable for ultra-high temperature, high salinity, high calcium and magnesium homogeneous reservoirs. technical background [0002] In the late stage of oil exploitation, it is difficult to stabilize production and the development situation is severe. Under current water flooding conditions, the recovery rate is only 35-45%, and most of the crude oil stays in the formation and is difficult to extract. In order to enhance oil recovery, chemical flooding methods such as polymer flooding, alkaline water flooding, surfactant flooding, and compound flooding such as binary or triple compound flooding are commonly used. Chemical flooding is the main method for EOR to enhance oil recovery. Among them, the surfactant can reduce the high oil-water interfacial tensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 赵金洲周明
Owner SOUTHWEST PETROLEUM UNIV
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