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Composition for enhanced oil recovery and its preparation method

A recovery factor and composition technology, which is applied in the field of compositions for improving crude oil recovery factor, can solve the problems of alkali corrosion, high use concentration, poor oil displacement efficiency, etc. The effect of excellent performance and good technical effect

Active Publication Date: 2011-12-14
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 enhanced oil recovery and its preparation method
  • Composition for enhanced oil recovery and its preparation method
  • Composition for enhanced oil recovery and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] Add 100g of pentyl (R=5) phenol polyoxyethylene (n=2) ether and 57g of pyridine into a four-necked round-bottomed flask equipped with a reflux condensing device, a thermometer, a stirrer and a gas absorption device, and heat to 70 under stirring. °C, slowly add 85 g of thionyl chloride dropwise with a dropping funnel, and react at 90 °C for 10 hours after the dropwise addition is completed. After the reaction, the reactants were left to stand, cooled and separated into layers. The upper organic phase was the target product, and the lower layer was solid pyridinium hydrochloride. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate the inorganic salt, then wash the upper organic phase with hot saturated saline for 5 to 6 times, and obtain the intermediate product chlorine after drying. Substituent amyl (R=5) phenol polyoxyethylene (n=...

Embodiment 2

[0038] Synthesis of Nonyl (R=9) Phenol Polyoxyethylene Ether (n=10) Sodium Hydroxysulfonate Betaine

[0039] 1) Synthesis of Chlorinated Nonyl (R=9) Phenol Polyoxyethylene (n=10) Ether

[0040] Add 100g of nonyl (R=9) phenol polyoxyethylene (n=10) ether and 22g of pyridine into a four-neck round bottom flask equipped with a reflux condensing device, a thermometer, a stirrer and a gas absorption device, and heat to 70 32.5 g of thionyl chloride was slowly added dropwise with a dropping funnel, and reacted at 70°C for 8 hours after the dropwise addition was completed. After the reaction, the reactants were left to stand, cooled and separated into layers. The upper organic phase was the target product, and the lower layer was solid pyridinium hydrochloride. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate the inorganic salt, then wash the upper organic phase with hot saturated saline for 5 to 6 times, and obtain the ...

Embodiment 3

[0047] Synthesis of dodecylphenol polyoxyethylene ether (n=20) sodium hydroxysulfonate betaine

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

[0049] Add 100g of dodecylphenol polyoxyethylene (n=20) ether and 13g of pyridine into a four-neck round bottom flask equipped with a reflux condensing device, a thermometer, a stirrer and a gas absorption device, heat to 60°C under stirring, and use 18.7 g of thionyl chloride was slowly added dropwise into the dropping funnel, and reacted at 80° C. for 10 hours after the dropwise addition was completed. After the reaction, the reactants were left to stand, cooled and separated into layers. The upper organic phase was the target product, and the lower layer was solid pyridinium hydrochloride. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate the inorganic salt, then wash the upper organic phase with hot saturated saline for 5 to 6 times, and...

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Abstract

The invention relates to a composition for improving the recovery ratio of crude oil 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 hydroxyl sulfonate 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 hydroxyl sulfonate betaine surfactant is shown as the specification, R is alkyl having 5 to 15 carbon atoms, n is the addition number of ethoxy groups, and the dereferencing range is any one integral number of between 2 and 20; M may be metal ion of potassium, sodium or lithium; and the polymer may be polyacrylamide with ultrahigh molecular weight, a temperature-resistant and salt-resistant polymer A or 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 for enhancing oil recovery and a preparation method thereof. Background technique [0002] With the development of society and economy, petroleum, as a non-renewable resource, is becoming more and more precious. 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, it is necessary to research and develop enhanced oil recovery technology. Through enhanced oil recovery measures in tertiary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
Inventor 孙文彬沙鸥张卫东沈之芹袁明
Owner CHINA PETROLEUM & CHEM CORP
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