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Compound surfactant composition for displacement of reservoir oil with hypersalinity

A surfactant and composition technology, applied in the field of composite surfactant composition, can solve the problems of poor oil displacement efficiency, corrosion equipment and pipeline demulsification difficulty, damage, etc., and achieve high interface activity, which is conducive to stripping, The effect of improving oil displacement efficiency

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is that the existing surfactants have poor oil displacement efficiency in the tertiary oil recovery process of high salinity reservoirs (20000~200000mg / L ion concentration), and because the oil displacement system contains inorganic alkali, the In order to solve the problems of damage to formation and oil wells, corrosion of equipment and pipelines, and difficulty in demulsification, a new composite surfactant composition is provided, which has high interface activity, strong oil washing ability, simple system, and will not affect The formation and oil wells will cause damage, will not corrode equipment and pipelines, and will not cause difficulties in demulsification

Method used

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  • Compound surfactant composition for displacement of reservoir oil with hypersalinity
  • Compound surfactant composition for displacement of reservoir oil with hypersalinity
  • Compound surfactant composition for displacement of reservoir oil with hypersalinity

Examples

Experimental program
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Effect test

Embodiment 1a

[0037] Dissolve sodium octadecyl diphenyl ether disulfonate and myristyl trimethyl ammonium chloride surfactant in water respectively, stir for 30 minutes, and prepare 0.1%wt aqueous solution, then add the above surfactant according to the anion : cationic surfactant molar ratio 1:0.5 mixed evenly, to obtain composite surfactant composition 1a.

Embodiment 2a

[0039] Sodium cetyl diphenyl ether disulfonate and dodecyltrimethylammonium chloride surfactant were respectively dissolved in water, stirred for 30 minutes, and prepared into 0.1%wt aqueous solution, and then the above surfactants were mixed according to the anion : cationic surfactant molar ratio 1:2 mixed uniformly to obtain composite surfactant composition 2a.

Embodiment 3a

[0041] Dissolve sodium dodecyl diphenyl ether disulfonate and octadecyltrimethylammonium bromide surfactant in water respectively, stir for 30 minutes, and prepare a 0.1%wt aqueous solution, and then mix the above surfactants according to the anion : Cationic surfactant molar ratio 1:6 mixes evenly, obtains composite surfactant composition 3a.

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Abstract

The invention relates to a compound surfactant composition and an application. The composition mainly solves the problem of low efficiency of reservoir oil displacement in tertiary oil recovery process of oil reservoir with hypersalinity due to surfactants. The compound surfactant composition comprises an anionic surfactant and a cationic surfactant, the mol ratio of the anionic surfactant and the cationic surfactant is 1:(0.01-100), wherein the cationic surfactant is selected from at least one of quarternary ammonium compounds, and the anionic surfactant is expressed by a molecular general formula shown in a formula (I); M1 and M2 are independently selected from any one of ammonium ion or alkali metal ion, and R is anyone of H, C1-C10 fatty group or aromatic base. The technical scheme better solves the problem and can be applied to tertiary oil recovery process of oil reservoir with hypersalinity.

Description

technical field [0001] The invention relates to a composite surfactant composition suitable for oil displacement in high salinity reservoirs. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. Conventional oil recovery methods (primary and secondary methods) generally only produce 1 / 3 of the crude oil geological reserves, and about 2 / 3 of the crude oil has not been recovered. Therefore, in the case of increasingly tight energy sources, enhanced oil recovery has become a A major topic of oil exploration research. Tertiary oil recovery technology is an effective method to increase oil reco...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 沈少春张卫东李应成沙鸥
Owner CHINA PETROLEUM & CHEM CORP
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