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PH-responsive heavy oil emulsifier and preparation method thereof

An emulsifier, type heavy oil technology, used in mechanical equipment, piping systems, gas/liquid distribution and storage, etc. problems such as low, to achieve good surface activity and emulsification and viscosity reduction performance, low cost, and solve the effect of difficult handling

Inactive Publication Date: 2019-09-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Viscosity reduction by heating consumes a lot of fuel, and the cost is high; the viscosity reduction by blending thin oil is not only limited by the source of thin oil, but also the thin oil mixed with heavy oil is calculated according to the price of heavy oil, so the economic benefit is low; Post-treatment (such as dehydration) problems occur, and it is not suitable for heavy oil with low water content; oil-soluble viscosity reducer has a low viscosity reduction rate and cannot be used alone

Method used

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  • PH-responsive heavy oil emulsifier and preparation method thereof
  • PH-responsive heavy oil emulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 18g of diethylaminoethyl methacrylate and 2g of methacryloyloxyethyltrimethylammonium chloride into a 250mL flask to form an aqueous solution with a total mass concentration of monomers of 20%. The total weight of 0.5% of the initiator was reacted at 70° C. for 8 hours to obtain a thick oil emulsifier.

[0019] Take 50 g of heavy oil (viscosity at 50° C. of 30000 mPa.s), dissolve 2 g of the heavy oil viscosity reducer in Example 1 in 50 mL of distilled water, then add the heavy oil into the emulsifier under stirring, and measure its viscosity at 50° C. It is 241mPa.s, the viscosity reduction rate is 99.26%, and the water precipitation rate is 10% after 2 hours. However, the pH of the emulsion was adjusted to 5-6 with HCl, and the emulsion broke and separated rapidly, and the water separation rate reached more than 80% within 0.5 hours.

Embodiment 2

[0021] Add 16g of diethylaminoethyl methacrylate and 4g of methacryloyloxyethyltrimethylammonium chloride into a 250mL flask to prepare an aqueous solution with a total mass concentration of monomers of 20%. 0.5% of the total mass of the initiator was reacted at 70° C. for 8 hours to obtain a thick oil emulsifier.

[0022] Take 50 g of heavy oil (viscosity at 50° C. of 30000 mPa.s), dissolve 3 g of the heavy oil viscosity reducer in Example 1 in 50 mL of distilled water, then add the heavy oil to the emulsifier under stirring, and measure its viscosity at 50° C. It is 113mPa.s, the viscosity reduction rate is 99.65%, and the water precipitation rate is 11% after 2 hours. However, the pH of the emulsion was adjusted to 5-6 with HCl, and the emulsion broke and separated rapidly, and the water separation rate reached more than 80% within 0.5 hours.

Embodiment 3

[0024] Add 14g of diethylaminoethyl methacrylate and 6g of methacryloyloxyethyltrimethylammonium chloride into a 250mL flask to form an aqueous solution with a total mass concentration of monomers of 20%. 0.5% of the total mass of the initiator was reacted at 70° C. for 8 hours to obtain a thick oil emulsifier.

[0025] Take 50 g of heavy oil (viscosity at 50° C. of 30,000 mPa.s), dissolve 4 g of the thick oil viscosity reducer in Example 1 in 50 mL of distilled water, then add the heavy oil to the emulsifier under stirring, and measure its viscosity at 50° C. It is 74mPa·s, the viscosity reduction rate is 99.77%, and the water precipitation rate is 3% after 2 hours. However, the pH of the emulsion was adjusted to 5-6 with HCl, and the emulsion broke and separated rapidly, and the water separation rate reached more than 80% within 0.5 hours.

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Abstract

The invention discloses a pH-responsive heavy oil emulsifier and a preparation method thereof, and belongs to the technical field of heavy oil viscosity reduction in petroleum exploitation. The preparation method comprises the following steps: adding a hydrophilic monomer methacrylatoethyl trimethyl ammonium chloride and a pH-responsive monomer 2-diethylaminoethyl methacrylate into a flask at a molar ratio of 1:(1-9) to make the total concentration of the monomers be 10-30%, introducing nitrogen for 30 min, adding 0.1-0.5% of an initiator, and carrying out a reaction at a temperature of 50-70DEG C for 4-8 h to prepare the pH-responsive heavy oil emulsifier. The heavy oil emulsifier has good surface activity under an alkaline condition, and makes the viscosity reduction rate of heavy oil reach 90% or more; and when the obtained emulsion is adjusted to be acidic, the emulsifier loses the surface activity, and the heavy oil emulsion automatically demulsifies. The above viscosity reducingagent solves the problem of difficulty in treatment of the heavy oil after emulsification and viscosity reduction, has the advantages of simplicity in preparation, cheap and easily available raw materials and high viscosity reduction rate, and has a broad application prospect in the field of heavy oil viscosity reduction.

Description

technical field [0001] The invention relates to a pH responsive heavy oil emulsifier and a preparation method thereof. Background technique [0002] my country is rich in heavy oil resources. According to statistics, my country has discovered more than 70 heavy oil fields in 12 basins and established 5 major development and production areas. The output has accounted for 10% of the country's total oil production. Heavy oil is playing an increasingly important role in my country's energy structure. important role. However, the molecular structure of heavy oil is complex, the content of heavy components is high, and the viscosity is high, which brings great difficulties to the exploitation, gathering and transportation of heavy oil. [0003] For a long time, heavy oil has mainly been collected and transported by heating, viscosity-reducing gathering and transportation mixed with thin oil, emulsification and viscosity-reducing gathering and transportation of oil-soluble viscosi...

Claims

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Application Information

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IPC IPC(8): C08F220/34F17D1/16
CPCC08F220/34F17D1/16
Inventor 郑存川黄志宇张太亮
Owner SOUTHWEST PETROLEUM UNIV
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