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Surfactant for displacing oil and preparation method

A surfactant and oil displacement technology, applied in the field of tertiary oil recovery, can solve the problems of ultra-low interfacial tension concentration range and narrow salinity range, complex production process, unacceptable oil field, etc. Good stability and strong salt tolerance

Active Publication Date: 2011-09-21
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current situation, the production process of this surfactant is relatively complicated, and the production cost is still high, so it is unacceptable for oilfields to use it in large quantities.
Moreover, when this surfactant is used alone to drive oil, its concentration range and salinity range for ultra-low interfacial tension are narrow

Method used

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  • Surfactant for displacing oil and preparation method
  • Surfactant for displacing oil and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1), preparation of residual oil sulfonate

[0028] First, add the remaining amount of vacuum residue into the reaction kettle, start stirring, heat up to 45°C, and then introduce 6% SO 3 Carry out sulfonation reaction, when the reaction is complete and the temperature no longer rises, age for 1 hour and keep the temperature at about 45°C, then add 8% isopropanol and stir evenly, and finally slowly add 15% hydrogen with a concentration of 30% dropwise The sodium oxide solution was neutralized. During the reaction, the temperature was controlled not to exceed 55°C. After the reaction was completed, the mixture was stirred for 1.0 hour to obtain the residual oil sulfonate.

[0029] (2), the preparation of intermediate sodium octylphenol sulfonate

[0030] First, add 0.3 mol of octylphenol into the reaction kettle, and pass 0.5 mol of SO at 40°C 3 The sulfonation reaction is carried out, and after the reaction is completed, a 30% solution containing 0.5 mol of NaOH is ad...

Embodiment 2

[0047] (1), preparation of residual oil sulfonate

[0048] First, add the remaining amount of vacuum residue into the reaction kettle, start stirring, heat up to 45°C, and then feed 10% SO 3 Carry out sulfonation reaction, when the reaction is complete and the temperature no longer rises, age for 1 hour and keep the temperature at about 45°C, then add 9% isopropanol and stir evenly, and finally slowly add 20% hydrogen with a concentration of 30% dropwise The sodium oxide solution was neutralized. During the reaction, the temperature was controlled not to exceed 55°C. After the reaction was completed, the mixture was stirred for 1.0 hour to obtain the residual oil sulfonate.

[0049] (2), the preparation of intermediate sodium octylphenol sulfonate

[0050] First, add 0.5 mol of octylphenol into the reaction kettle, and pass 0.8 mol of SO at 40°C 3 The sulfonation reaction is carried out, and after the reaction is completed, a 30% solution containing 0.8 mol of NaOH is added dr...

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Abstract

The invention relates to a surfactant for displacing oil and a preparation method. According to the invention, the preparation of the surfactant for displacing oil comprises the following steps: adding a residue sulfonate surfactant and polyoxyethylene octylphenol ether sulfonate into a mixing kettle; starting stirring with the increase of temperature to 45 DEG C; slowly adding isopropanol and water into the mixing kettle, followed by continuous stirring for 45 to 60 minutes; and carrying out cooling and discharging to obtain a surfactant for displacing oil. The surfactant for displacing oil comprises the following components by weight: 70 to 80% of the residue sulfonate surfactant, 10 to 15% of polyoxyethylene octylphenol ether sulfonate, 2 to 5% of isopropanol, and the balance being water. The surfactant for displacing oil provided in the invention enables the oil-water interfacial tension to be reduced to 10-3mN / m that is the lowest level under the high-temperature, high-salinity, and alkali-free condition; and a single surfactant for displacing oil enables the recovery efficiency to be improved by over 13.5%. Therefore, the surfactant for displacing oil has broad application prospects in tertiary oil recovery field of high temperature and high salinity reservoir.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery, in particular to an oil displacement surfactant suitable for high-temperature and high-salt oil reservoirs and a preparation method thereof. Background technique [0002] Various chemical flooding technologies containing surfactants are widely used in tertiary oil recovery, such as ASP flooding, binary compound flooding, and surfactant flooding. Surfactant plays an important role in these oil displacement processes, and it mainly achieves the purpose of enhancing oil recovery by reducing the oil-water interfacial tension and increasing the capillary number. For ordinary oil reservoirs, the research on oil displacement surfactants is relatively successful, and the application effect is relatively ideal. For example, petroleum sulfonate and alkylbenzene sulfonate can be compatible with formation fluids to form ultra-low interfacial tension to achieve enhanced oil recovery. the goal o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 郭东红辛浩川崔晓东谢慧专杨晓鹏张雅琴
Owner PETROCHINA CO LTD
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