Oil displacement surfactant for high-temperature and high-salt oil reservoir as well as preparation method and application of oil displacement surfactant

A surfactant, high-temperature and high-salt technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that alkylbenzene sulfonate cannot be compatible with formation fluid, the surfactant structure is easily destroyed, and cannot form Ultra-low interfacial tension and other issues, to improve the performance of salt resistance and resistance to divalent ions, wide application prospects and practical significance, and reduce the effect of oil-water interfacial tension

Active Publication Date: 2021-01-22
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high-temperature and high-salt reservoirs, alkylbenzene sulfonates cannot be well compatible with formation fluids, cannot form ultra-low interfacial tension, and fail to achieve the purpose of improving recovery
The reason is that the structure of surfactants in high-temperature and high-salt oil reservoirs is easily destroyed or changed, and the effect of enhancing oil recovery becomes poor.

Method used

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  • Oil displacement surfactant for high-temperature and high-salt oil reservoir as well as preparation method and application of oil displacement surfactant
  • Oil displacement surfactant for high-temperature and high-salt oil reservoir as well as preparation method and application of oil displacement surfactant
  • Oil displacement surfactant for high-temperature and high-salt oil reservoir as well as preparation method and application of oil displacement surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 oil displacement surfactant 1#

[0035] Oil displacement surfactant 1# comprises the component of following percentage by weight: C 12 Fatty acid diethanolamide 24%, the betaine compound (R 1 =16, m=2, n=2, R 2 For propylene sulfo) 30%, C 12 Sodium alkylbenzene sulfonate 20%, isopropanol 12% and deionized water 14%.

[0036] The preparation method of oil displacement surfactant 1# may further comprise the steps:

[0037] Proportionally add isopropanol and water to the reaction vessel, and then add C 12 Fatty acid diethanolamide, betaine compound (R 1 =16, m=2, n=2, R 2 For propylene sulfo), C 12 Sodium alkylbenzene sulfonate was added in proportion, mixed and stirred for 30 minutes, then deionized water was slowly added in portions, and stirred evenly. The product is yellow homogeneous liquid with good water solubility, the solubility is not lower than 10g / 100g water, pH=8-10.

Embodiment 2

[0038] Embodiment 2 oil displacement surfactant 2#

[0039] Oil displacement surfactant 1# comprises the component of following percentage by weight: C 18 Fatty acid diethanolamide 32%, the betaine compound (R 1 =16, m=2, n=2, R 2 For propylene sulfo) 28%, C 14 Sodium Alkylbenzene Sulfonate 12%, Isopropanol 10%, and Deionized Water 18%.

[0040] The preparation method of oil displacement surfactant 1# may further comprise the steps:

[0041] Proportionally add isopropanol and water to the reaction vessel, and then add C 18 Fatty acid diethanolamide, betaine compounds (R 1 =16, m=2, n=2, R 2 For propylene sulfo), C 14 Sodium alkylbenzene sulfonate was added in proportion, mixed and stirred for 40 minutes, then deionized water was slowly added in portions, and stirred evenly. The product is yellow homogeneous liquid with good water solubility, the solubility is not lower than 10g / 100g water, pH=8-10.

Embodiment 3

[0042] Embodiment 3 oil displacement surfactant 3#

[0043] Oil displacement surfactant 3# comprises the composition of following percentage by weight: C 16Fatty acid diethanolamide 30%, the betaine compound (R 1 =14, m=5, n=6, R 2 is a sulfo group) 32%, C 16 Sodium alkylbenzene sulfonate 21%, isopropanol 10% and deionized water 7%.

[0044] The preparation method of above-mentioned oil displacement surfactant 3# comprises the steps:

[0045] Proportionally add isopropanol and water to the reaction vessel, and then add C 16 Fatty acid diethanolamide, betaine compounds (R 1 =14, m=5, n=6, R 2 is the sulfo group), C 16 Sodium alkylbenzene sulfonate was added in proportion, mixed and stirred for 60 minutes, then deionized water was slowly added in portions, and stirred evenly. The product is yellow homogeneous liquid with good water solubility, the solubility is not lower than 10g / 100g water, pH=8-10.

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Abstract

The invention discloses an oil displacement surfactant for a high-temperature and high-salt oil reservoir as well as a preparation method and application of the oil displacement surfactant. The oil displacement surfactant comprises the following components in parts by weight: 1-35 parts of fatty acid alkanolamide or esterification derivatives thereof, 1-35 parts of betaine compounds, 1-30 parts ofalkylbenzene sulfonate and 1-30 parts of low-molecular alcohol. Through compounding of the anionic surfactant alkylbenzene sulfonate, the nonionic surfactant fatty acid alkanolamide and the zwitterionic surfactant betaine, the salt resistance and the divalent cation resistance of the surfactant are greatly improved through the synergistic effect of multiple groups, and the surfactant can be usedfor oil displacement of an oil layer with high mineralization degree; and the oil displacement surfactant can remarkably reduce oil-water interfacial tension, is high in stability, small in dosage andhigh in efficiency, can be used as an oil displacement surfactant of a high-temperature and high-salt oil reservoir, can also be suitable for a low-temperature and low-salt oil reservoir, and is widein application range.

Description

technical field [0001] The application relates to an oil displacement surfactant for high-temperature and high-salt oil reservoirs and its preparation method and application, belonging to the technical field of oilfield chemicals. Background technique [0002] With the increasing development of oilfields, the difficulty of crude oil extraction is increasing day by day, and the demand for enhanced oil recovery is gradually increasing. The new tertiary oil recovery technology and post-tertiary oil recovery technology are getting more and more attention. In order to enhance oil recovery, chemical flooding methods such as polymer flooding, alkaline water flooding, surfactant flooding, and compound flooding such as binary or triple compound flooding are commonly used. According to the evaluation results of the enhanced oil recovery potential of onshore oilfields in my country, chemical flooding can significantly increase the recoverable reserves, with huge potential, and it is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 崔仕章郭鑫宋新旺侯云福杨金兴黄琦活栾翔
Owner DESHI ENERGY TECH GRP CO LTD
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