Method for reducing viscosity of thick oil by blending thin oil based on oil-based nano fluid

A nanofluid and heavy oil technology, applied in chemical instruments and methods, drilling compositions, molybdenum sulfide, etc., can solve the problems of large consumption of thin oil, poor viscosity reduction effect, low economic benefits, etc., to achieve good economic Benefits, reduce mining costs, improve the effect of thermal conductivity

Active Publication Date: 2021-10-22
CHANGZHOU UNIV
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Problems solved by technology

[0005] Aiming at the above-mentioned problems of high consumption of thin oil, poor viscosity reduction effect and low economic benefits, the present invention provides a method for thick oil blending thinning and viscosity reduction based on high thermal conductivity and recyclable oil-based nanofluid, which can reduce Reduce the amount of thin oil used, improve the viscosity reduction effect, improve the utilization rate of thin oil, and seek better economic benefits

Method used

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  • Method for reducing viscosity of thick oil by blending thin oil based on oil-based nano fluid
  • Method for reducing viscosity of thick oil by blending thin oil based on oil-based nano fluid
  • Method for reducing viscosity of thick oil by blending thin oil based on oil-based nano fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Prepare magnetic molybdenum disulfide: prepare 100 mL of ethanol aqueous solution containing molybdenum disulfide with a mass fraction of 0.5% (the volume ratio of ethanol and water is 1:1), sonicate for 1 h; Hexaalkyltrimethylammonium bromide aqueous solution, at room temperature, stirring continuously at 800rpm for 3h; transfer the above liquid to a flask, add 2g of ferric chloride and 0.8g of ferrous chloride, and place in a constant temperature water bath at 80°C Add nitrogen gas (at a rate of 0.5 L / min) and continue the reaction for 1 h; add 10 mL of ammonium hydroxide with a concentration of 0.1 mol / L dropwise into the flask, and keep stirring for 4 h in a constant temperature water bath at 80°C; finally, the obtained liquid Filter, wash, and dry in a vacuum oven at 80°C for 6 hours to obtain magnetic molybdenum disulfide.

[0032] Step 2: Measure the diesel oil and weigh the magnetic molybdenum disulfide, disperse the magnetic molybdenum disulfide in the ...

Embodiment 2

[0039] Step 1: First, measure the initial viscosity of heavy oil at 40°C, 50°C, 60°C, 70°C, and 80°C respectively.

[0040] Step 2: Take 2 parts of heavy oil samples with a quality of 20g, weigh 5g each of the diesel oil and magnetic molybdenum disulfide / diesel dispersion in Example 1, add them to the heavy oil samples and stir evenly, and carry out thinning and viscosity reduction. The doping rate at this time was 20%.

[0041] Step 3: Measure the viscosity of two heavy oil samples mixed with thin oil at 40°C, 50°C, 60°C, 70°C, and 80°C respectively, and calculate the viscosity reduction rate. The results are shown in Table 2.

[0042] Table 2 Comparison of viscosity reduction rate of heavy oil mixed with diesel and magnetized molybdenum disulfide / diesel dispersion under different temperature conditions

[0043]

[0044] According to Table 2, under the condition of 20% dilution rate, when the temperature is 40 ℃ and 50 ℃, the viscosity reduction rate of magnetic molybdenum ...

Embodiment 3

[0047] The diesel oil, magnetic molybdenum disulfide / diesel dispersion and heavy oil in Examples 1 and 2 were used to carry out viscosity-reducing experiments at 50°C with different dilution ratios. The results are shown in Table 3.

[0048] Table 3 Comparison of viscosity reduction rate of heavy oil mixed with diesel and magnetized molybdenum disulfide / diesel dispersion under different dilution ratios

[0049]

[0050] According to Table 2, when the dilution rate is 5% and 10%, the viscosity reduction rate of diesel dispersion of magnetic molybdenum disulfide to heavy oil is 17.94% and 16.59% higher than that of diesel oil to heavy oil; When the dilution rate is 40% and 50%, it increases by 3.02% and 2.04% respectively. This shows that under the same temperature conditions, when the dilution rate is low, the viscosity-reducing effect of adding thin oil on heavy oil is mainly due to heat transfer, which reduces the viscosity of heavy oil. Therefore, the magnetized molybdenu...

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Abstract

The invention discloses a method for reducing the viscosity of thick oil by blending thin oil based on oil-based nano fluid. The method comprises the following steps: magnetizing molybdenum disulfide to obtain magnetic molybdenum disulfide; dispersing the obtained magnetic molybdenum disulfide in thin oil, which is selected from one of diesel oil, bio-diesel and vegetable oil, to obtain magnetic molybdenum disulfide / thin oil dispersion liquid; and mixing the magnetic molybdenum disulfide / thin oil dispersion liquid into thick oil for viscosity reduction treatment. The high-thermal-conductivity magnetic nano molybdenum disulfide is introduced into the thick oil thin oil blending viscosity reduction process, heat of thin oil can be transferred into thick oil more evenly and more efficiently, the heat utilization rate is increased, meanwhile, the thick oil viscosity reduction rate is increased, and the thick oil recovery cost is reduced; and the high-thermal-conductivity nano molybdenum disulfide is magnetized, the obtained magnetic molybdenum disulfide can be efficiently recycled under the condition that an artificial magnetic field is added after the heavy oil is lifted to the ground, the performance is basically unchanged after washing and drying treatment, the magnetic molybdenum disulfide can be recycled, and the cost of doping the high-thermal-conductivity nano fluid to achieve viscosity reduction of the heavy oil is reduced.

Description

technical field [0001] The invention belongs to the field of heavy oil exploitation, and in particular relates to a method for thick oil blending and thinning to reduce viscosity based on highly heat-conductive and recyclable oil-based nanofluid. Background technique [0002] With the rapid development of the global economy, the demand for energy is increasing. As the main energy source, oil is actively increasing the production of crude oil to meet the growing energy demand. Heavy oil is an important class of crude oil resources, and the proven reserves of heavy oil resources in my country reach 1.6×10 9 t, is the fourth largest producer of heavy oil in the world. my country's onshore heavy oil resources account for more than 1 / 5 of the total petroleum resources. Successful exploitation of my country's heavy oil resources is of great significance for increasing domestic crude oil production and reducing crude oil dependence on foreign countries. Because heavy oil is rich ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/82C01G39/06
CPCC09K8/58C09K8/82C01G39/06C09K2208/10C01P2006/32C01P2006/42
Inventor 浮历沛蒋路军廖凯丽何岩峰陶磊任张坤厉通马芊漓张翔顾婉倚安俊南顾峰
Owner CHANGZHOU UNIV
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