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Acid-sensitive variable-viscosity mixed surfactant

A technology of surfactant and active agent, applied in the field of acid-sensitive viscous mixed surfactant, can solve the problems of high cost, high concentration of viscoelastic surfactant, application limitation, etc., and achieve increased flow resistance and uniform acidification effect of effect

Inactive Publication Date: 2012-07-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In the above chemical self-steering applications, the self-steering effect of surfactants is the best on site, but the concentration of viscoelastic surfactants used is relatively high, generally greater than 4%, so the cost is high and its application is limited

Method used

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  • Acid-sensitive variable-viscosity mixed surfactant

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Experimental program
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Embodiment 1

[0029] Embodiment 1: According to the mass ratio of sulfonate gemini surfactant and alkyl glycoside nonionic surfactant is 4: 1, 3: 1, 2: 1, 1: 1, 1: 2, 1: 3 and 1 : 4 prepare the mixed surfactant system that the total mass concentration of surfactant is 2% respectively, then add the anhydrous calcium chloride that mass concentration is 2% respectively in each system, measure different shear rates under the condition of 60 ℃ Viscosity, the results are shown in Table 1. Under the mass ratio of 1:4~4:1, the mixed surfactant has higher viscosity, and the viscosity is far greater than the viscosity of a single surfactant solution, and when the mass ratio is 2:1, the viscosity of the mixed surfactant Best for thickening.

[0030] Table 1 Viscosity of acid-sensitive mixed surfactant system

[0031]

Embodiment 2

[0032] Embodiment 2: preparation hydrochloric acid mass concentration is respectively the mass ratio of sulfonate gemini surfactant and alkyl glycoside nonionic surfactant of 1%, 0.5%, 0.1%, 0.05%, 0.01%, 0.005% and 0% It is a 2: 1 mixed surfactant solution system, the total surfactant mass concentration of the system is 1.5%, and then anhydrous calcium chloride with a mass concentration of 2% is added to each system, and measured at 60°C Viscosities at different shear rates are shown in Table 2. The viscosity of the mixed surfactant system increases with the decrease of acid mass concentration.

[0033] The influence of table 2 acid concentration on the viscosity of acid-sensitive mixed surfactant system

[0034]

Embodiment 3

[0035]Embodiment 3: preparation mass concentration is 1.5%, the mass ratio of sulfonate gemini surfactant and alkyl glycoside nonionic surfactant is the mixed surfactant solution system of 2: 1 and mass concentration is 2% anhydrous Calcium chloride solution, the viscosity of the solution system is very large, then add the volume ratio of 3% kerosene, the viscosity of the solution system obviously decreases after stirring, then add the volume ratio of 3% kerosene, the solution system viscosity is close to the viscosity of water.

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Abstract

The invention provides an acid-sensitive variable-viscosity mixed surfactant, formed by mixing sulphonate Gemini surfactant and alkyl glucoside non-ionic surfactant in mass ratio of (1-4): (4-1). Viscosity of a mixed system is high, after acid is added into the system, the viscosity is rapidly reduced. In an acid-containing acid-sensitive mixed surfactant system, viscosity of solution is improved by consuming acid, and the acid-containing acid-sensitive mixed surfactant system has low-permeability interval automatic finding characteristic during oil reservoir acidification, has automatic steering function, can realize uniform acidification and can obtain good acidification effect. The acid-containing acid-sensitive mixed surfactant has high viscosity after being acidified, the viscosity can be automatically reduced after the acid-containing acid-sensitive mixed surfactant is contacted with crude oil or hydrocarbon substance, the viscosity is close to the viscosity of water, and the acid-containing acid-sensitive mixed surfactant is easy to flow back.

Description

Technical field: [0001] The invention relates to an acid-sensitive viscous mixed surfactant, specifically, the viscosity of the acid-sensitive viscous mixed surfactant system increases with the decrease of the acid liquid concentration, has a self-steering function, and can be used for acidification Self-steering agent. Background technique: [0002] Acidizing is one of the enhanced oil recovery (EOR) methods, and an effective technical measure for increasing production of oil and gas wells and injection wells. Its principle is to recover or improve the permeability of formation pores and fractures through the dissolution and dissolution of acid liquid on rock cement or formation pores and blockages in fractures. Acidizing can be divided into pickling, matrix acidizing and acid fracturing (also called acid fracturing) according to different processes. Pickling is to inject a small amount of acid liquid into the wellbore to remove acid-soluble particles, drill cuttings and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 刘德新汪龙梅赵修太王彦玲王增宝白英睿邱广敏谭枭麒
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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