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Method for preparing modified betaine type amphoteric surfactant used for tertiary oil recovery

A surfactant and surface active technology, applied in the direction of sulfonate preparation, chemical instruments and methods, drilling compositions, etc., can solve the problem of affecting the surface tension of the solution, the active agent molecules cannot be closely arranged, salt resistance, and high temperature resistance Unsatisfactory performance and other problems, to achieve the effect of high interface activity

Inactive Publication Date: 2010-11-24
程玉桥
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] At present, the surfactants used in EOR are mainly the traditional sulfonate and carboxylate anionic surfactants. Due to the electrostatic repulsion between the ion headgroups of the same electrical property and the steric position of the headgroup hydration layer, these surfactants The hindering effect prevents the molecules from being densely arranged in space, that is, no matter in the air / water interface adsorption layer or in the aggregate of the bulk phase, there is a certain equilibrium distance between the ions and the head groups in the surfactant molecules, which cannot be completely compact. As a result, the active agent molecules cannot be closely arranged on the air / water interface, which seriously affects the performance of the active agent, thereby further affecting the surface (interface) tension of the solution.
In addition, the traditional sulfonate and carboxylate anionic surfactants are not ideal in resistance to divalent cations, salt resistance, and high temperature resistance.

Method used

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  • Method for preparing modified betaine type amphoteric surfactant used for tertiary oil recovery

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preparation example Construction

[0013] The preparation method of the alkylhydroxy sultaine type amphoteric surfactant for tertiary oil recovery of the present invention is to use sodium bisulfite, epichlorohydrin, and long-chain alkyl tertiary amine as raw materials, through ring-opening reaction, quaternary The ammonification reaction makes the alkyl hydroxy sultaine type amphoteric surfactant, and the preparation steps are as follows:

[0014] (1) Preparation of 3-chloro-2-hydroxypropanesulfonate sodium: NaHSO 3 Dissolve in water, and slowly add equimolar epichlorohydrin to it when the temperature rises to 40°C. After the addition was completed and the reaction was continued for 7 hours, white crystals were precipitated by cooling, which were spin-dried with a rotary evaporator to obtain 3-chloro-2-hydroxypropanesulfonate sodium crystals;

[0015] (2) Salt formation: the 3-chloro-2-hydroxypropanesulfonate sodium prepared in step (1) and the long-chain alkyl tertiary amine are dissolved in methanol at a ra...

Embodiment 1

[0022] Fully dissolve 0.3 mol of sodium bisulfite in 50 mL of distilled water. When the temperature rises to 40°C, slowly drop in equimolar epichlorohydrin with a dropping funnel, and finish the reaction after 7 hours of reaction. The ring opening reaction produces sodium 3-chloro-2-hydroxy-propanesulfonate.

[0023] Add 1-1.5Ml of long-chain alkyl tertiary amine and 60ML of methanol solvent into the flask containing the above product, heat to reflux at 90°C for 8h, and end the reaction to obtain the target product. Three experiments were performed in parallel, and the obtained products could make the oil-water interfacial tension reach ultra-low.

Embodiment 2

[0025] Get prepared alkyl hydroxy sultaine surfactant 0.4g, water 99.6g, carry out interfacial tension measurement experiment with Shengli Gudong crude oil, Gudao crude oil and Shengtuo crude oil respectively, from the experimental result, the active agent of research and development Good universality, oil-water interfacial tension can reach ultra-low (10 -3 mM / m), has good heat and salt resistance, calcium and magnesium resistance. The water used in the experiment was Gudong Dongsanlian injection water (its salinity is 10428mg / L, and the concentration of calcium and magnesium ions is 330mg / L). (The salinity is 8618mg / L, the concentration of calcium and magnesium ions is 189mg / L), the crude oil is the crude oil of 2N3 well; ), the crude oil is crude oil from well 5-5; Shengtuo six station water (its salinity is 17435mg / L; calcium and magnesium ion concentration is 475mg / L), crude oil is crude oil from well 2-4-N251.

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Abstract

The invention provides a method for preparing a modified betaine type amphoteric surfactant used for tertiary oil recovery. In the method, sodium bisulphite, epichlorohydrin and long-chain alkyl tertiary amine serving as raw materials are subjected to ring-opening reaction and quaterisation to form the amphoteric surfactant used for displacement of reservoir oil. Because the amphoteric type oil displacement agent for tertiary oil recovery is a modified sulfonate betaine type surfactant, the modified betaine type amphoteric surfactant for tertiary oil recovery of the invention has higher performance compared with the conventional surfactants. The surfactant of the invention has the advantages of typical and mature method, high interfacial activity, high efficiency and environmental protection and high universality.

Description

technical field [0001] The invention relates to a method for preparing a novel surface active agent for chemical flooding to increase oil recovery in oil reservoirs, in particular to synthesize an alkyl hydroxy sultaine type surface active agent by using a propanesulfonic acid intermediate method. Background technique [0002] In recent decades, in view of my country's special reservoir conditions and the adaptability of various technologies, chemical compound flooding has become one of the most promising tertiary oil recovery methods. Surfactants selected for tertiary oil recovery stand out in oilfield applications. Surfactants are a class of active molecules with amphiphilic groups. When the surfactant enters the solution, the amphiphilic groups will be distributed in a directional distribution at the liquid / solid interface, liquid / liquid interface and bulk phase solution, and the polar groups When combined with the surface of minerals and rocks, polar water molecules or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/13C07C303/32B01F17/18B01F17/04C09K8/584C09K23/04C09K23/18
Inventor 程玉桥孙焕泉李振泉宋新旺崔晓红王红艳李秀兰严兰郭淑凤李青华
Owner 程玉桥
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