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Oil displacement compound for tertiary oil recovery and preparation method thereof

A composition and oil displacement technology, which are applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of alkali corrosion, high use concentration and poor oil displacement efficiency in ternary composite flooding, and reduce the interfacial tension. Strong ability, excellent performance, easy biodegradation effect

Active Publication Date: 2011-10-19
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, high use concentration and the impact of alkali on formation and oil well in ASP flooding. Corrosion and fouling damage problems, providing a new oil displacement composition for EOR

Method used

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  • Oil displacement compound for tertiary oil recovery and preparation method thereof
  • Oil displacement compound for tertiary oil recovery and preparation method thereof
  • Oil displacement compound for tertiary oil recovery 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 an oil displacement compound for tertiary oil recovery and a preparation method thereof, mainly aiming at solving the problems that oil displacement agent containing surface active agents has poor oil displacement efficiency and high using concentration under the high-temperature and high-salt conditions, and corrosion and scale deposition to a stratum and an oil well, caused by alkali in the ternary compound flooding, happen in the prior art. The oil displacement compound for tertiary oil recovery comprises the following components according to mass percentage: (1) 0.01-5.0 percent of N,N-bi fatty acyl group diamine neopentanoic acid di-polyoxyethylene ether bisulphonate; (2) 0.01-3.0 percent of polymer; (3) 92.0-99.98 percent of formation water, wherein in the general molecular formula of the component (1), R1 is C9-C17 alkyl group, R2 is C2-C6 alkyl group, n is composite number of ethoxy groups (EO) and is one integer from 2-7; M is one metal ion of K, Na or Li; the polymer is selected from one of polyacrylamide with superhigh molecular weight (viscosityaverage molecular weight is 25,000,000), temperature resisting salt-resisting polymer or xanthogen gum, and water is selected from the formation water of the oil field. By the technical scheme, the problems are better solved, and the oil displacement compound is suitable for tertiary oil recovery production in the oil field.

Description

technical field [0001] The invention relates to an oil displacement composition for tertiary oil recovery 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, i...

Claims

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Application Information

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IPC IPC(8): C09K8/588
Inventor 沈之芹翟晓东沙鸥张慧
Owner CHINA PETROLEUM & CHEM CORP
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