Oil displacement method by use of seawater base oil displacement agent

An oil displacement method and oil displacement agent technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of alkali corrosion, poor oil displacement efficiency, and high concentration in ASP flooding , to achieve the effect of strong ability to reduce interfacial tension, excellent performance, and resistance to high salinity

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem 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 salt conditions

Method used

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  • Oil displacement method by use of seawater base oil displacement agent
  • Oil displacement method by use of seawater base oil displacement agent
  • Oil displacement method by use of seawater base oil displacement agent

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] [Example 1]

[0036] (a) Synthesis of double twelve (lauro) acyl ethylene diamine

[0037] Add 300 g (1.5 mol) of lauric acid, 267.8 g (2.25 mol) of thionyl chloride and 4.5 g of DMF into a 2000 ml four-necked flask equipped with a sealed mechanical stirrer, thermometer, condenser, etc., and react at 90°C for 3 After hours, the excess thionyl chloride was evaporated under reduced pressure to obtain lauroyl chloride. When the temperature drops to 60°C, add 150 grams of dry toluene. After stirring, 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 temperature of the mixture is controlled to be less than 60°C, and the temperature is raised to 85°C for 2 hours after dripping. After cooling, filtering, the crude product was recrystallized with ethanol and dried in vacuum to obtain a white powdery solid with a molar yield of 97.1%.

[0038] (b) Synthesis of N, N-didodecanoyl ethylenediamine dia...

Example Embodiment

[0046] [Example 2]

[0047] (a) Synthesis of didecanoyl hexamethylene diamine

[0048] Same as [Example 1] (a), except that 58.0 g (0.5 mol) of anhydrous hexamethylene diamine was used instead of 30.0 g (0.5 mol) of anhydrous ethylene diamine, and the rest was the same. After vacuum drying, a white powdery solid was obtained. The molar yield is 95.6%.

[0049] (b) Synthesis of N, N-didodecanoyl hexamethylene diamine diacetic acid

[0050] Add 225.6 grams (0.47 moles) of bislauroyl hexamethylene diamine synthesized in step (a), 450 grams of tetrahydrofuran, 105.3 grams (1.88 moles) of potassium hydroxide and 4.5 grams of tetrabutylammonium bromide, and add them with mechanical stirring and thermometer In a 2000 ml three-necked flask with reflux condenser, heat to reflux for basification reaction for 3 hours. After cooling slightly, a total of 164.3 g (1.41 mol) of sodium chloroacetate solid was added in five times, and the reaction was kept at reflux for 9 hours. Cooling, neutralizi...

Example Embodiment

[0057] [Example 3]

[0058] (a) Synthesis of Dideca(decyl) butanediamine

[0059] Same as [Example 1] (a), except that 261.0 grams (1.5 moles) of capric acid was used instead of 300.0 grams (1.5 moles) of lauric acid, and 44.0 grams (0.5 moles) of anhydrous butanediamine was used instead of 30.0 grams (0.5 Mol) Anhydrous ethylenediamine, the rest are the same, a white powdery solid is obtained after vacuum drying, with a molar yield of 96.7%.

[0060] (b) Synthesis of N,N-Didecanoylbutanediamine diacetic acid

[0061] Add 186.1 grams (0.47 moles) of bisdecanoyl butanediamine synthesized in step (a), 400 grams of tetrahydrofuran, 112.8 grams (2.82 moles) of sodium hydroxide and 7.5 grams of tetrabutylammonium bromide, and add them with mechanical stirring and thermometer In a 2000 ml three-necked flask with reflux condenser, heat to reflux for basification reaction for 3 hours. After cooling slightly, a total of 219.0 g (1.88 mol) of sodium chloroacetate solid was added in five times...

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Abstract

The invention relates to an oil displacement method by the use of a seawater base oil displacement agent and mainly solves the problem that a surfactant-containing oil displacement agent in the prior art has poor oil displacement efficiency and high concentration and alkali in alkali-surfactant-polymer flooding brings corrosion and deposit damage to stratum and oil well. According to the oil displacement method by the use of the seawater base oil displacement agent, underground dehydrated crude oil contacts with the seawater base oil displacement agent to fully displace the crude oil from thecore under the injection water condition that the oil displacement temperature is 30-83 DEG C, the total salinity is greater than 8000mg/L and Ca<2+> + Mg<2+> is greater than 200mg/L. The seawater base oil displacement agent comprises the following components of: by weight, (1) 0.01-5.0% of N,N-double fatty acyl diamines diacetic acid dipolyoxyethylene ether double carboxylate; (2) 0.01-3.0% of apolymer; (3) 92.0-99.98% of injection water. The technical scheme greatly solves the problem and can be used for the tertiary oil recovery production in oil field.

Description

technical field [0001] The invention relates to an oil displacement method using a seawater-based oil displacement agent. 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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IPC IPC(8): C09K8/584E21B43/22
Inventor 沈之芹吴国英沙鸥鲍新宁
Owner CHINA PETROLEUM & CHEM CORP
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