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Nanometer silicon dioxide modified sulphonate oil-displacing agent and preparation method thereof

A nano-silica, silica technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of scaling in the ground injection system, unfavorable residual oil recovery, difficulty in crude oil demulsification, etc. High activity, easy biodegradation, low price effect

Inactive Publication Date: 2009-11-04
SINOPEC PETROLEUM ENG DESIGN
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Problems solved by technology

In some oil fields, a large amount of alkali is added at the same time as the oil displacement agent in the tertiary oil recovery, which can greatly reduce the oil-water interfacial tension, but the addition of alkali brings certain difficulties to the demulsification of crude oil. Blocking the oil hole is not conducive to the further exploitation of remaining oil, and the addition of alkali also leads to serious fouling of the ground injection system

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  • Nanometer silicon dioxide modified sulphonate oil-displacing agent and preparation method thereof
  • Nanometer silicon dioxide modified sulphonate oil-displacing agent and preparation method thereof
  • Nanometer silicon dioxide modified sulphonate oil-displacing agent and preparation method thereof

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Embodiment Construction

[0016] Preparation of the oil displacement agent of the present invention: Naphthenic oil and fuming concentrated sulfuric acid are added into the reaction kettle according to the mass ratio of 5:1 to 2.5:1, and the temperature is raised to 10°C to 80°C for sulfonation Reaction, the reaction time is 1 to 10 hours. After the sulfonation reaction is completed, neutralize the material with alkaline water until the material is weakly alkaline to obtain a naphthene sulfonate; according to the total mass parts of the naphthene sulfonate, the total mass part is 60-90, and the nanometer silicon dioxide accounts for the total mass part The number is 10-40, put into the reaction kettle; raise the temperature to 20°C-50°C, stir for 1-4 hours, and obtain the oil-displacing agent of the present invention.

[0017] Application of the oil-displacing agent of the present invention: the total mass fraction of the oil-displacing agent is 0.3-0.4, i.e. 4000mg.L -1 ; The oil-water system is the ...

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Abstract

The invention provides a nanometer silicon dioxide modified sulfonate oil-displacing agent and a preparation method thereof, which belong to synthesis of a chemical oil-displacing agent in tertiary recovery by a simple and convenient and easily industrialized method. The method comprises the following steps that: firstly, naphthene base crude oil is sulfonated and neutralized at a temperature of between 10 and 80 DEG C to obtain sulfonate; secondly, the sulfonate is subjected to graft modification by nano-grade silicon dioxide; and finally, the nanometer modified sulfonate oil-displacing agent is obtained. The nanometer silicon dioxide modified sulfonate oil-displacing agent comprises 60 to 90 portions of naphthene base sulfonate and 10 to 40 portions of nanometer silicon dioxide by mass portion. The oil-displacing agent can be used for an oil-displacing experiment; when mass fraction of dosage of the oil-displacing agent is 0.3, the oil-displacing agent can reduce the tensile force of oil-water boundary to 5*10mN.m to effectively reduce adhesive force of residual oil, so that the residual oil is easy to deform and separate; meanwhile, the capillary resistance is reduced, so that the residual oil drop is easy to aggregate to form an oil wall and the oil recovery efficiency is improved. The oil-displacing agent has low price, simple synthesis process and convenient popularization and application.

Description

1. Technical field [0001] The invention relates to a nano silicon dioxide modified sulfonate oil displacement agent and a preparation method thereof. The oil displacement agent of the invention belongs to the chemical oil displacement agent used in tertiary oil recovery. 2. Technical background [0002] With the rapid development of the economy, the country's demand for crude oil is increasing. According to statistics, the total consumption of crude oil in China last year reached 270 million tons, of which the net import volume exceeded 100 million tons, accounting for about 30% of the total consumption. %; According to expert analysis, if a country's crude oil imports exceed 30% of the total consumption, the international crude oil price will affect the development of the country's national economy. Therefore, crude oil has become an important factor restricting China's economic development. [0003] In order to reduce the impact of international crude oil prices on China's...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 王建华韩霞孙正贵朱红黄毅管善峰王田丽
Owner SINOPEC PETROLEUM ENG DESIGN
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