A kind of preparation method of low permeability reservoir oil displacement agent

An oil-displacing agent and low-permeability technology, which is applied in the preparation of organic compounds, the preparation of carboxylic acid amides, chemical instruments and methods, etc., can solve the problems of unsatisfactory effect and high cost of alkanolamides, improve oil phase adaptability, The effect of improving interfacial activity and reducing interfacial tension

Active Publication Date: 2016-01-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of high-purity alkanolamides on reducing the interfacial tension of oil and water is not ideal, and the cost of high-purity alkanolamides is relatively high

Method used

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  • A kind of preparation method of low permeability reservoir oil displacement agent
  • A kind of preparation method of low permeability reservoir oil displacement agent
  • A kind of preparation method of low permeability reservoir oil displacement agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, the fatty acid ester is methyl laurate, the alcohol amine is diethanolamine, and the catalyst is sodium methylate.

[0029] Add 21.41 g of methyl laurate and 11.61 g of diethanolamine to a four-necked flask with a thermometer, a stirrer and a distillation device, mix, stir and heat until the solution temperature is 100°C, add sodium methoxide catalyst, the amount of catalyst is 0.275g (8.33 wt‰), start timing when the catalyst is completely added, control the reaction temperature at 120-135°C, and react for 3 hours.

[0030] Infrared chromatographic analysis shows that: in the obtained product, the main product fatty acid alkanolamide is about 66%, the by-product amino ester and amide ester are about 15%, and the rest are incompletely reacted fatty acid ester, alkanolamine and unavoidable raw material impurities .

[0031] For the oil displacement agent synthesized by the above method, a surfactant solution with a concentration of 0.2wt% was prepared with...

experiment example 2

[0036] Experimental example 2. Oil displacement agent reservoir adaptability experiment

[0037] Synthesize the oil displacement agent according to the method of Example 1. At a constant temperature of 40°C, a solution with a concentration of 0.2wt% is prepared with 20000ppm mineralized water. After the sample tube is injected into the above surfactant solution, the TEXAS-500 spinning drop interfacial tensiometer is adjusted to At 40°C, put the sample tube filled with the above solution into the sample tube, and after stabilizing for half an hour, add about 1 microliter of crude oil from different origins with a micro-syringe. Tuo crude oil, under the rotation speed of 6000r / min, read the interfacial tension value at regular intervals, and draw the interfacial tension curve, see figure 2 shown. Depend on figure 2 It can be seen that the oil displacement agent can quickly reduce the crude oil / water interfacial tension of the above-mentioned different origins to 10 -3 mN / m,...

experiment example 3

[0038] Experimental example 3, the experiment of the relationship between the interfacial activity of the oil displacement agent and the temperature

[0039] Synthesize the oil displacement agent according to the method of Example 1. At a constant temperature of 40°C, a solution with a concentration of 0.2wt% is prepared with 20000ppm mineralized water. After the sample tube is injected into the above surfactant solution, the TEXAS-500 spinning drop interfacial tensiometer is adjusted to At 60°C, put the sample tube filled with the above solution into it, and after stabilizing for half an hour, add about 1 microliter of Shengtuo Waijiao oil in Shengli Oilfield with a micro-syringe, and read the interface at regular intervals at a speed of 6000r / min Tension value, drawing interfacial tension curve see image 3 shown. Depend on image 3 It can be seen that under the condition of 60°C, the oil displacement agent can reduce the oil / water interfacial tension in Shengtuo, Shengli ...

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Abstract

The invention relates to a preparation method of a low-permeability reservoir oil-displacing agent. A one-pot method is used for synthesizing; an aliphatic ester and alcohol amine are used as reactants to react under the effect of an alkaline catalyst with the specific ratio, and do not need to be separated to directly prepare an oil-displacing agent product; the oil-displacing agent has high interface activity and oil-phase adaptability; and in a range of mineralized water of 40-130 DEG C and 3000-50000ppm and under the condition of no need of additionally adding a surfactant and an alkali, oil / water interface interfacial tension values of crude oil from different producing areas can be ultralow and be 10<-3>mN / m and can reach 10<-5>mN / m at minimum. The oil-displacing agent disclosed by the invention can resist a high temperature and high salts; an applicable condition is wide; and the oil-displacing agent has a better application prospect on the aspect of development of a low-permeability reservoir.

Description

technical field [0001] The invention relates to a preparation method of an oil displacement agent for a low-permeability oil reservoir, belonging to the technical field of oil field chemical industry. Background technique [0002] In recent years, with the decrease of recoverable reserves of medium and high permeability reservoirs, people pay more and more attention to the development of low permeability reservoirs. Surfactant flooding has been proved to be a very promising method to enhance the recovery of low permeability oilfields, and has become a research hotspot at home and abroad. [0003] Compared with medium and high permeability reservoirs, residual oil droplets in low permeability reservoirs exist in pores with small throat radius. Under the same conditions, the capillary resistance of residual oil droplets is much greater than that of medium and high permeability reservoirs. Therefore, Activation of these residual oil droplets requires lower oil-water interfacia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C07C233/18C07C231/02
Inventor 李英张森
Owner SHANDONG UNIV
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