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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, high use concentration and corrosion and damage caused by alkali in ASP flooding to formation and oil well. The problem of fouling damage, providing a new oil displacement method using seawater-based oil displacement agent

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

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

[0047] (a) Synthesis of double lauryl hexamethylene diamine

[0048] 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%.

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

[0050] 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 ...

Embodiment 3

[0058] (a) Synthesis of two ten (decyl) acyl butanediamine

[0059] 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%.

[0060] (b) N, the synthesis of N-didecanoyl butanediamine diacetic acid

[0061] 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 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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