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Composite surfactant oil displacement system suitable for high calcium and magnesium oil reservoir, and preparation method of composite surfactant oil displacement system

A composite surfactant, high calcium and magnesium technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of weak resistance to calcium and magnesium ions, etc., achieve excellent oil displacement performance, broad application prospects, Highly stable effect

Active Publication Date: 2019-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a composite surfactant flooding system suitable for high calcium and magnesium reservoirs in view of the problem that the existing surfactant flooding system is not strong enough to resist calcium and magnesium ions

Method used

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  • Composite surfactant oil displacement system suitable for high calcium and magnesium oil reservoir, and preparation method of composite surfactant oil displacement system
  • Composite surfactant oil displacement system suitable for high calcium and magnesium oil reservoir, and preparation method of composite surfactant oil displacement system
  • Composite surfactant oil displacement system suitable for high calcium and magnesium oil reservoir, and preparation method of composite surfactant oil displacement system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 0.03g of capric acid diethanolamide and 0.12g of fatty alcohol polyoxyethylene ether sodium sulfate and add them to 99.85g of simulated formation water. The calcium and magnesium ion content of the simulated formation water is 2000mg / L, and the total salinity is 60000mg / L. Stir for 0.5 hour to fully dissolve the surfactant, and then use hydrochloric acid to adjust the pH of the system to neutral to obtain a transparent oil displacement system without precipitation.

Embodiment 2

[0027] Take 0.16g of lauric acid diethanolamide and 0.04g of fatty alcohol polyoxyethylene ether sodium sulfate and add them to 99.80g of simulated formation water. The calcium and magnesium ion content of the simulated formation water is 2000mg / L, and the total salinity is 20000mg / L. Stir for 1.5 hours to fully dissolve the surfactant, and then use hydrochloric acid to adjust the pH of the system to neutral to obtain a transparent oil displacement system without precipitation.

Embodiment 3

[0029] Take 0.75g of myristic acid diethanolamide and 0.05g of fatty alcohol polyoxyethylene ether sodium sulfate and add them to 99.20g of simulated formation water. The calcium and magnesium ion content of the simulated formation water is 600mg / L, and the total salinity is 5000mg / L. Stir for 1.0 hour to fully dissolve the surfactant, and then use hydrochloric acid to adjust the pH of the system to neutral to obtain a transparent oil displacement system without precipitation.

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Abstract

The invention discloses a composite surfactant oil displacement system suitable for a high calcium and magnesium oil reservoir, and a preparation method of the composite surfactant oil displacement system. By the total weight of the composite surfactant oil displacement system, the composite surfactant oil displacement system is prepared from the following components in percentage by weight: 0.0125-0.8% of alkanolamide, 0.01-0.75% of sodium fatty alcohol polyoxyethylene ether sulfate, and 99.00-99.95% of simulated formation water or oilfield formation water. The composite surfactant oil displacement system and raw oil can form ultra-low oil / water interface tension less than or equal to 10<-3> mN / m, and the composite surfactant oil displacement system has excellent oil displacement performance and good stability, and has broad application prospects in the process of three-time mining of the high calcium and magnesium oil reservoir.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, and more specifically relates to a composite surfactant oil displacement system suitable for high calcium and magnesium oil reservoirs and a preparation method thereof. Background technique [0002] In the late stage of oil exploitation, it is difficult to stabilize production and the development situation is severe. Under the 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. Surfactant flooding, as an effective way to enhance oil recovery, is one of the hotspots in tertiary oil recovery research at home and abroad. At present, the widely used surfactants for oil displacement mainly include anionic, nonionic and amphoteric surfactants. When screening surfactant flooding systems, an important indicator is the ability to reduce the oil / water interfacial tension to ≤10 -3 mN / m. At present, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 吕成远刘平谭中良张晓东杜辉夏凯马涛周国华许关利卢刚
Owner CHINA PETROLEUM & CHEM CORP
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