Method of displacing oil by anionic-cationic composite surfactant

A compound surfactant and surfactant technology, applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve problems such as corrosion equipment and pipeline demulsification difficulties, formation and oil well damage, poor oil displacement efficiency, etc. , to achieve enhanced oil recovery, high interfacial activity, and improved water-oil mobility ratio

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the oil displacement method using surfactant in the prior art has poor oil displacement efficiency in the tertiary oil recovery process, and at the same time, because the oil displacement system contains inorganic alkali, it will cause damage to the formation and oil well, corrode equipment and To solve the problem of difficult pipeline and demulsification, provide a new oil displacement method using anion and cation composite surfactants

Method used

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Embodiment 1

[0025]Dissolve phenyltrimethylammonium chloride and sodium sulfosalicylate in water respectively, and then mix the above two solutions evenly according to the molar ratio of phenyltrimethylammonium chloride and sodium sulfosalicylate 1:0.1 , to obtain anion and cation complex surfactants. Dissolve ultra-high molecular weight polyacrylamide in water to prepare an aqueous solution. Then mix the aforementioned 0.2wt% negative and positive composite surfactant, 0.15wt% ultra-high molecular weight polyacrylamide and 99.65wt% injection water from the offshore block of Shengli Oilfield and stir for 2 hours to obtain a uniform and transparent high-efficiency oil displacement agent .

[0026] The TX-500C spinning drop interfacial tensiometer was used to measure the oil-water interface of anion and cationic composite surfactants (one-component system) and their composites with polymers (poly-surface binary system) and the offshore block IFA-8 of Shengli Oilfield. tension. The measure...

Embodiment 2

[0034] Dissolve decyltriethylammonium hydroxide and sodium α-olefin sulfonate (carbon chain length is C15-18) in water respectively, and then : 0.4 The above two solutions are mixed uniformly to obtain anion-cation complex surfactant. Dissolve ultra-high molecular weight polyacrylamide in water to prepare an aqueous solution. Then mix the aforementioned 0.05wt% negative and positive composite surfactant, 1.00wt% ultra-high molecular weight polyacrylamide and 98.95wt% injection water from the offshore block of Shengli Oilfield and stir for 2 hours to obtain a uniform and transparent high-efficiency oil displacement agent .

[0035] The TX-500C spinning drop interfacial tensiometer was used to measure the oil-water interface of anion and cationic composite surfactants (one-component system) and their composites with polymers (poly-surface binary system) and the offshore block IFA-8 of Shengli Oilfield. tension. The measured temperature is 60 o C, the salinity is 29858mg / L, C...

Embodiment 3

[0043] Dissolve tetraethylammonium chloride and lignosulfonate in water respectively, and then mix the above two solutions evenly according to the molar ratio of tetraethylammonium chloride and lignosulfonate of 1:1.4 to obtain anion-cation composite Surfactant. Dissolve ultra-high molecular weight polyacrylamide in water to prepare an aqueous solution. Then the aforementioned 0.2wt% negative and positive composite surfactant, 0.15wt% ultra-high molecular weight polyacrylamide and 99.65wt% Henan Shuanghe Oilfield Layers 5-11 are mixed with water and stirred for 2 hours to obtain a uniform and transparent high-efficiency oil displacement agent.

[0044] The TX-500C spinning drop interfacial tensiometer was used to measure the anionic and cationic composite surfactants (one-component system) and their composites with polymers (poly-surface binary system) and Henan Shuanghe Oilfield. Interfacial tension of oil and water in layers 5-11. The measured temperature is 81 o C, fo...

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Abstract

The invention relates to a method of displacing oil by anionic-cationic composite surfactant and mainly solves the problems that the prior method of displacing oil by surfactant is low in oil displacement efficiency in tertiary oil recovery and an oil displacement system containing inorganic base is harmful to stratums and oil wells, corrosive to equipment and pipelines and difficult for demulsification. According to the technical scheme, crude oil is allowed to contact with oil-displacing agent, and the oil-displacing agent comprises, by weight percent, 0.01-5.0% of anionic-cationic composite surfactant, 0.01-3.0% of polymer, and 92.0-99.98% of injected water. The problems are solved well. The method is applicable to tertiary oil recovery for oil fields.

Description

technical field [0001] The invention relates to an oil displacement method using anion and cation compound surfactants. 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 It has become a major topic in oil exploration research. Tertiary oil recovery technology is an effective method to increase oil recovery, which can be di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/584
Inventor 李应成沙鸥张卫东沈之芹鲍新宁
Owner CHINA PETROLEUM & CHEM CORP
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