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High-efficient foam compound flooding agent for tertiary oil recovery and preparation method thereof

A technology of composite oil displacement and oil displacement agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor compatibility and unsatisfactory oil-water interfacial tension, and achieve low cost, improved oil recovery, and raw materials Easy to get effect

Inactive Publication Date: 2013-08-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single active agents on the market are mainly alkylbenzene sulfonate, sodium lignin sulfonate and other products. The ability to reduce the interfacial tension of oil and water is not ideal, and the compatibility with formation water is poor. Good, good compatibility with formation water, low oil-water interfacial tension, anti-aging high-efficiency oil displacement agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.5g of sodium α-olefin sulfonate, 1.5g of sodium fatty alcohol polyoxyethylene ether sulfonate, 0.9g of lauryl hydroxysulfobetaine,

[0028] Add 1000 g of water to the rest, pour it into a reactor equipped with a stirring device, and react at 85° C. for 3 hours under stirring to obtain an oil-displacing agent.

[0029] At a temperature of 85°C. Salinity 30000mg / L (Ca 2+ +Mg 2+ =800mg / L), using the Roche foam meter to measure the foam half

[0030] The decay period is 120min, and the foaming volume is 220mL; using the STV20 spinning drop interfacial tensiometer, the minimum oil-water interfacial tension is 2.0×10 -3 mN / m. Using the simulated oil displacement experimental device, the gas permeability is 1.5μm 2 Under these conditions, the measured results can increase the recovery by 15.0%.

Embodiment 2

[0032] Put 2.0g of sodium α-olefin sulfonate, 2.0g of sodium fatty alcohol polyoxyethylene ether sulfonate, 1.0g of lauryl amidopropyl betaine, and add 1000g of water to the rest, pour it into a reactor with a stirring device, and stir for 85 °C for 2.5 hours to prepare the oil displacing agent.

[0033] At a temperature of 80°C. Salinity 28000mg / L (Ca 2+ +Mg 2+ =700mg / L), using the Roche foam meter to measure the foam half

[0034] The decay period is 140min, and the foaming volume is 230mL; using the STV20 spinning drop interfacial tensiometer, at the rotation speed of 5000 rpm, the minimum oil-water interfacial tension is 3.0×10 -3 mN / m. Using the simulated oil displacement experimental device, the gas permeability is 1.5μm 2 Under these conditions, the measured results can increase the recovery by 14.5%.

Embodiment 3

[0036] 2.0g sodium α-olefin sulfonate, 2.0g sodium lauryl polyoxyethylene ether sulfonate, 1.0g 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazoline betaine, add 1000g water to the rest, Pour it into a reactor equipped with a stirring device, and react at 85° C. for 2 hours under stirring to obtain an oil-displacing agent.

[0037] At a temperature of 85°C. Salinity 25000mg / L (Ca 2+ +Mg 2+ =800mg / L), using the Roche foam meter to measure the foam half

[0038] The decay period is 150min, and the foaming volume is 240mL; using the STV20 spinning drop interfacial tensiometer, the minimum oil-water interfacial tension measured at a rotation speed of 5000 rpm is 1.0×10 -3 mN / m. Using the simulated oil displacement experimental device, the gas permeability is 1.5μm 2 Under these conditions, the measured results can increase the recovery by 17.1%.

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PUM

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Abstract

The invention relates to a high-efficient foam compound flooding agent for tertiary oil recovery and a preparation method thereof, belonging to the technical field of chemical flooding capable of improving the recovery ratio of crude oil from an oilfield. Surfactants used by the high-efficient foam compound flooding agent take sodium alpha-olefin sulfonate as a main surfactant, and the high-efficient foam compound flooding agent is prepared by compounding the surfactant with other anionic surfactants, amphoteric surfactants and anionic-nonionic surfactants. Compared with the prior art, the high-efficient compound flooding agent has the characteristics of good capability of reducing tension of an oil-water interface, good compatibility with high-salinity water, no influence of the salinity on the tension of the oil-water interface, small using quantity and the like. A compound flooding system can improve the recovery rate of the crude oil by above 17%.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, relates to the construction of petroleum tertiary oil recovery system, and more specifically relates to a high-efficiency compound oil displacement agent applied to tertiary oil recovery and a preparation method thereof. Background technique [0002] With the continuous development of oil extraction, oil fields in many regions of the world have entered the stage of high water content and ultra-high water content in the later stage of development, and the underground crude oil is in a discontinuous dispersion state, that is, the underground crude oil contains a large amount of water, and the crude oil cannot be spread over large areas. together. In order to improve oil recovery and increase recoverable reserves, the main existing method in the prior art is to use alkali / polymer / surfactant ASP flooding to enhance oil recovery. Among them, ASP flooding (alkali-polymer-surfactant) is ...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 舒增荣相明辉廖蒙蒙宋新旺祝仰文
Owner SHANGHAI UNIV
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