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Seawater-based oil displacement agent and preparation method thereof

An oil-displacing agent and seawater-based technology, which is applied in the field of seawater-based oil-displacing agent and its preparation, can solve the problems of alkali corrosion, poor oil displacement efficiency, and high concentration in ASP flooding, and achieve a strong ability to reduce interfacial tension, Excellent performance, high salinity resistance effect

Active Publication Date: 2013-06-19
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 oil displacement agent containing surfactant in the prior art has poor oil displacement efficiency under high temperature and high salinity conditions, the use concentration is high, and the alkali in the ASP flooding brings formation and oil wells. Problems of corrosion and fouling damage, providing a new seawater based oil displacing agent

Method used

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  • Seawater-based oil displacement agent and preparation method thereof
  • Seawater-based oil displacement agent and preparation method thereof
  • Seawater-based oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (a) Synthesis of two lauryl (lauroyl) ethylenediamine

[0037] 300 grams (1.5 moles) of lauric acid, 267.8 grams (2.25 moles) of thionyl chloride and 4.5 grams of DMF were added to a 2000-milliliter four-necked flask equipped with a sealed mechanical stirrer, a thermometer, a condenser tube, etc., and reacted at 90 ° C for 3 After one hour, excess thionyl chloride was distilled off under reduced pressure to obtain lauroyl chloride. When the temperature drops to 60°C, add 150 grams of dry toluene, and after stirring evenly, slowly add 30.0 grams (0.5 moles) of anhydrous ethylenediamine, 99.0 grams (1.25 moles) of anhydrous pyridine and 150 grams of dry toluene The mixed solution of gram composition, control temperature is less than 60 ℃, dropwise and be warmed up to 85 ℃ and react for 2 hours. After cooling and filtering, the crude product was recrystallized from ethanol and dried in vacuo to obtain a white powdery solid with a molar yield of 97.1%.

[0038] (b) Synthe...

Embodiment 2

[0046] (a) Synthesis of double lauryl hexamethylene diamine

[0047] Same as [Example 1] (a), except that 58.0 grams (0.5 moles) of anhydrous hexamethylenediamine is used to replace 30.0 grams (0.5 moles) of anhydrous ethylenediamine, and the rest are the same. After vacuum drying, a white powdery solid is obtained. The molar yield is 95.6%.

[0048] (b) Synthesis of N, N-dilauroyl hexamethylene diamine diacetic acid

[0049]225.6 grams (0.47 moles) of dilauroyl hexamethylenediamine, 450 grams of tetrahydrofuran, 105.3 grams (1.88 moles) of potassium hydroxide and 4.5 grams of tetrabutylammonium bromide are added with mechanical stirring and thermometer And in the 2000 milliliter three-neck flask of reflux condenser, be heated to reflux alkalinization reaction 3 hours. After cooling slightly, add a total of 164.3 grams (1.41 moles) of sodium chloroacetate solid five times, and keep the reflux reaction for 9 hours. Cool, neutralize with hydrochloric acid until the reaction s...

Embodiment 3

[0056] (a) Synthesis of two ten (decyl) acyl butanediamine

[0057] With [Example 1] (a), the difference replaces 300.0 grams (1.5 moles) of lauric acid with 261.0 grams (1.5 moles) of capric acid, and replaces 30.0 grams (0.5 moles) of anhydrous butanediamine with 44.0 grams (0.5 moles). mol) anhydrous ethylenediamine, and the rest are the same, and after vacuum drying, a white powdery solid is obtained, and the molar yield is 96.7%.

[0058] (b) N, the synthesis of N-didecanoyl butanediamine diacetic acid

[0059] 186.1 grams (0.47 moles) of bis-decanoyl butanediamine synthesized in step (a), 400 grams of tetrahydrofuran (THF), 112.8 grams (2.82 moles) of sodium hydroxide and 7.5 grams of tetrabutylammonium bromide are added and equipped with a mechanical stirrer and a thermometer And in the 2000 milliliter three-neck flask of reflux condenser, be heated to reflux alkalinization reaction 3 hours. After cooling slightly, add a total of 219.0 g (1.88 moles) of sodium chloroa...

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Abstract

The invention relates to a seawater-based oil displacement agent and a preparation method thereof. By the seawater-based oil displacement agent, the problems of poor oil displacement efficiency, high using concentration and corrosion and scale depositing damage of alkali in alkali-surfactant-polymer (ASP) flooding to strata and oil wells at a high temperature and high salinity in a surfactant-containing oil displacement agent in the prior art are mainly solved. The seawater-based oil displacement agent comprises the following components in percentage by mass: (1) 0.01 to 5.0 percent of N,N-double fatty acyl diamine oxalic acid dipolyoxyethylene ether dicarboxylate, (2) 0.01 to 3.0 percent of polymer and (3) 92.0 to 99.98 percent of injection water, wherein the N,N-double fatty acyl diamine oxalic acid dipolyoxyethylene ether dicarboxylate has a molecular general formula shown in the specifications, R1 is alkyl having 9 to 17 carbon atoms, R2 is alkyl having 2 to 6 carbon atoms, n is the addition number of ethoxy groups EO and is an integral number ranging from 2 to 7, and M may be metal ions of potassium ions, sodium ions or lithium ions; polymer may be one or two of anionic polyacrylamide with superhigh molecular weight, modified polyacrylamide or xanthan gum; and water is selected from injection water in oil fields. Through the technical scheme, the problems are better solved. The method can be used for the production of tertiary oil recovery in the oil fields.

Description

technical field [0001] The invention relates to a seawater-based oil displacement agent and a preparation method thereof. Background technique [0002] With the development of society and economy, people's demand for oil continues to increase and oil reserves decrease, and oil, as a non-renewable resource, is becoming more and more valuable. The problems we are facing are: first, the contradiction between supply and demand is prominent, the demand for oil is getting bigger and bigger, and new oil fields are getting fewer and fewer; second, there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can produce 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, primary oil recovery and secondary oil recovery only produce 25-50% of underground crude oil. In order to ensure the long-term stable supply of oil and meet the needs of human beings, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
Inventor 沈之芹李应成翟晓东何秀娟
Owner CHINA PETROLEUM & CHEM CORP
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