Surfactant for displacing oil of offshore oilfield and preparation method thereof

A surfactant, a technology for offshore oil fields, applied in the preparation of sulfonates, chemical instruments and methods, and drilling compositions, etc., can solve the problem of alkali affecting normal production, difficulty in demulsification of produced fluid, and difficulty in replacing pipe strings, etc. problems, to avoid the influence of reservoirs and oil production equipment, to achieve good emulsification and viscosity reduction effect, and to improve the effect of oil recovery.

Active Publication Date: 2014-12-10
秦皇岛诺曼克化工科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ASP flooding containing alkali is easy to form alkali scale, which will cause problems such as formation blockage, oil-water pipeline corrosion, and difficulty in demulsification of produced fluid; especially in offshore oil fields, the plugging removal effect is poor, and it is difficult to replace the pipe string. Affect normal production

Method used

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  • Surfactant for displacing oil of offshore oilfield and preparation method thereof
  • Surfactant for displacing oil of offshore oilfield and preparation method thereof
  • Surfactant for displacing oil of offshore oilfield and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A surfactant for oil flooding in offshore oilfields, including two surfactants, the main agent is hydroxypropyl sulfobetaine amphoteric surfactant with a molecular weight of 350-410, and the mass is 40Kg; the auxiliary agent is a molecular weight of 600- The 640 alkylphenol polyoxyethylene ether nonionic surfactant has a quality of 60kg.

[0047] The structural formula of hydroxypropyl sultaine is as follows:

[0048]

[0049] where R n =C 12 or C 14 .

[0050] Alkylphenol polyoxyethylene ether nonionic surfactant is linear octylphenol polyoxyethylene ether-10.

Embodiment 2

[0052] A surfactant for oil displacement in offshore oilfields, including two surfactants, the main agent is a hydroxypropyl sulfobetaine amphoteric surfactant with a molecular weight of 350-410, and the mass is 30Kg; the auxiliary agent is a molecular weight of 600- 640 alkylphenol polyoxyethylene ether nonionic surfactant, the quality is 65Kg; the auxiliary agent isopropyl alcohol is 5Kg.

Embodiment 3

[0054] A preparation method for a surfactant for oil flooding in offshore oilfields, comprising the following processes:

[0055] 1. The preparation process of the surfactant system main agent:

[0056] a. Add 15.6g of sodium bisulfite and 6.3g of sodium sulfite to the three-neck flask, use distilled water as solvent, stir until completely dissolved; then add 9.25g of epichlorohydrin dropwise, keep the temperature of the water bath at 18~30°C, and complete the dropwise addition After reacting for 2 hours, white crystals were observed to precipitate. After the reaction, aging, suction filtration, and drying were performed to obtain the crystalline intermediate product 3-chloro-2-hydroxypropyl sodium sulfonate.

[0057] b. Using 10% 1,2-propanediol as a solvent, add 25.5 g of sodium 3-chloro-2-hydroxypropyl sulfonate into the there-necked flask, heat up and stir until completely dissolved. When the temperature rose to 75°C, 22.7g of lauryl dimethyl tertiary amine was added dr...

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Abstract

The invention relates to surfactant for displacing the oil of an offshore oilfield and a preparation method thereof, and the surfactant and the preparation method thereof belong to the technical field of surfactants. The surfactant for displacing the oil of the offshore oilfield comprises the following components: hydroxypropyl sulfo betaine type amphoteric surfactant is adopted as the main agent and alkylphenol polyoxyethylene ether non-ionic surfactant serves as the auxiliary agent. The preparation method comprises the following steps that 1) the main agent is prepared: (1) water is adopted as the solvent to react with sodium hydrogen sulfite, sodium sulfite and epoxy chloropropane, and 3-chloro-2-hydroxypropyl sodium sulfonate is prepared; (2) low-carbon alcohol is adopted as the solvent, the product in the step (1) and emulsifier are dissolved, 12 / 14 tertiary amine is dripped in, and reflux reaction is carried out; (3) the tertiary amine and the solvent which do not react are removed, recrystallized and filtered; 2) assistant agent is selected; and 3) the main agent and the auxiliary agent are prepared by the mass ratio of 30 to 50: 30 to 90. The surfactant for displacing the oil of the offshore oilfield and the preparation method thereof have the advantages of ultra-low interfacial tension and good performance of emulsified crude oil, no toxin, no harm to the stratum, good compatibility, cooperation with polymer, microorganism and other flooding agent to displace oil and the like.

Description

technical field [0001] The invention belongs to the technical field of surfactants, in particular to a surfactant for oil displacement in offshore oil fields and a preparation method thereof. Background technique [0002] Surfactants reduce oil-water interfacial tension and emulsify crude oil by adsorbing on the oil-water interface, thereby enhancing oil recovery. The widely used surfactants in oil flooding are petroleum sulfonate anionic surfactants. Although its raw materials are easy to obtain and have good water solubility, such surfactants have low interfacial activity, and it is generally difficult to achieve ultra-low oil-water interfacial tension; and most petroleum sulfonates cannot emulsify crude oil, and crude oil is difficult to disperse after oil-water mixing In the surfactant solution, the oil and water are separated, and the crude oil floats on top of the surfactant. In addition, petroleum sulfonic acid has poor salt resistance, especially when the content o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C07C309/14C07C303/32
Inventor 胡欣
Owner 秦皇岛诺曼克化工科技有限公司
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