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Composition for improving recovery ratio substantially and preparation method thereof

A technology of recovery factor and composition, which is applied in the field of composition and its preparation that can greatly increase recovery factor, can solve the problems of alkali corrosion, high use concentration and poor oil displacement efficiency in ASP flooding, and achieve The ability to reduce interfacial tension, high salinity resistance, and the effect of enhancing oil recovery

Active Publication Date: 2013-12-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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 composition that can greatly enhance oil recovery

Method used

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  • Composition for improving recovery ratio substantially and preparation method thereof
  • Composition for improving recovery ratio substantially and preparation method thereof
  • Composition for improving recovery ratio substantially and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Synthesis of chloropentyl (R=5) phenol polyoxyethylene (n=2) ether

[0031] Into a four-necked round bottom flask equipped with reflux condenser, thermometer, stirrer and gas absorption device, add 100g amyl (R=5) phenol polyoxyethylene (n=2) ether and 57g pyridine, and heat to 70g under stirring. °C, slowly drip 85 g of thionyl chloride with a dropping funnel, and react at 90 °C for 10 hours after the addition is complete. After the reaction is over, the reactants are allowed to stand and cool to separate layers, the upper organic phase is the target product, and the lower layer is solid pyridine hydrochloride salt. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate out inorganic salts, and then wash the upper organic phase with hot saturated brine for 5-6 times, and dry to obtain the intermediate product chlorine Pentyl (R=5) phenol polyoxyethylene (n=2) ether, the yield was 88%.

[0032] 2) Synthesis of pen...

Embodiment 2

[0038] Synthesis of nonyl (R=9) phenol polyoxyethylene ether (n=10) sodium carboxylate betaine

[0039] 1) Synthesis of chlorononyl (R=9) phenol polyoxyethylene (n=10) ether

[0040] Into a four-necked round bottom flask equipped with reflux condenser, thermometer, stirrer and gas absorption device, add 100g nonyl (R=9) phenol polyoxyethylene (n=10) ether and 22g pyridine, and heat to 70g under stirring. At 0°C, 32.5 g of thionyl chloride was slowly added dropwise with a dropping funnel, and after the addition, the reaction was carried out at 70°C for 8 hours. After the reaction is over, the reactants are allowed to stand and cool to separate layers, the upper organic phase is the target product, and the lower layer is solid pyridinium hydrochloride salt. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate out inorganic salts, and then wash the upper organic phase with hot saturated brine for 5-6 times, and dry to obtain ...

Embodiment 3

[0047] Synthesis of Dodecylphenol Polyoxyethylene Ether (n=20) Sodium Carboxylate Betaine

[0048] 1) Synthesis of chlorododecylphenol polyoxyethylene (n=20) ether

[0049] Into a four-necked round bottom flask equipped with reflux condenser, thermometer, stirrer and gas absorption device, add 100g dodecylphenol polyoxyethylene (n=20) ether and 13g pyridine, and heat to 60℃ with stirring. 18.7 g of thionyl chloride was slowly added dropwise to the dropping funnel, and after the addition, the reaction was carried out at 80° C. for 10 hours. After the reaction is over, the reactants are allowed to stand and cool to separate layers, the upper organic phase is the target product, and the lower layer is solid pyridinium hydrochloride salt. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate out inorganic salts, and then wash the upper organic phase with hot saturated brine for 5-6 times, and dry to obtain the intermediate prod...

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Abstract

The invention relates to a composition for improving a recovery ratio substantially and a preparation method thereof. The invention mainly aims to solve the problems of poor oil displacement efficiency, high using concentration and corrosion and scale depositing damage to strata and oil wells due to alkali in ternary combination flooding under the condition of high temperature and high salt in a surfactant-containing oil displacement agent in the prior art. The oil displacement composition for tertiary oil recovery comprises the following components in percentage by weight: 0.01 to 5.0 percent of alkylphenol ethoxylate carboxylate betaine surfactant, 0.01 to 3.0 percent of polymer and 92.0 to 99.98 percent of water, wherein a molecular general formula of the alkylphenol ethoxylate carboxylate betaine surfactant is shown as the specification, R is alkyl having 5 to 15 carbon atoms, n which is the addition number of ethoxy groups is one integral number of between 2 and 20; M may be one of potassium, sodium and lithium; and the polymer may be one of polyacrylamide with ultrahigh molecular weight, a temperature-resistant and salt-resistant polymer A and xanthan gum. By the technical scheme, the problems are better solved. The composition can be used for the production of tertiary oil recovery in oil fields.

Description

Technical field [0001] The invention relates to a composition capable of greatly improving the recovery rate and a preparation method thereof. Background technique [0002] With the development of social economy, oil as a non-renewable resource is becoming more and more precious. The first problem is that the contradiction between supply and demand is prominent. The greater the demand for oil, the greater the number of new oil fields. Second, there is still a large amount of crude oil remaining in the depleted oil reservoir. Primary oil recovery (POR) can produce 10-25% of underground crude oil, and secondary oil recovery (SOR) can produce 15-25% of underground crude oil, that is, only 25-50% of underground crude oil can be produced from primary and secondary oil recovery. In order to ensure a long-term stable supply of oil, it is necessary to research and develop technologies to improve oil recovery. Through enhanced oil recovery measures, EOR can increase the oil recovery by 6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
Inventor 孙文彬沈之芹张慧袁明何秀娟
Owner CHINA PETROLEUM & CHEM CORP