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Thickened oil cracking and viscosity-reducing method based on nano-catalysis and microwave heating

A technology of microwave heating and nano-catalysis, which is used in earth-moving drilling, preparation of test samples, and production of fluids, etc., can solve the problems of high cost of oil-soluble viscosity reduction process, rising water content of oil wells, and small application range, and achieve energy utilization. good rate, less oil pollution in the reservoir, and good viscosity reduction effect

Inactive Publication Date: 2016-01-27
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity-reducing effect of chemical agents is relatively significant, but there are large differences in different oil fields, and the application range is small
At the same time, there are other problems, such as the water content of oil wells increases and oil production decreases due to the water-soluble viscosity-reducing process, the high cost of the oil-soluble viscosity-reducing process, environmental pollution, etc.
Viscosity reduction by catalytic cracking has also been researched and made great progress in recent years. The main problems are the need for high temperature, long reaction time and viscosity recovery.

Method used

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  • Thickened oil cracking and viscosity-reducing method based on nano-catalysis and microwave heating
  • Thickened oil cracking and viscosity-reducing method based on nano-catalysis and microwave heating
  • Thickened oil cracking and viscosity-reducing method based on nano-catalysis and microwave heating

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 (using the carbon nano-catalyst adopted in the present invention): at first select the ultra-heavy oil of a domestic oil field as the target oil sample, and its original viscosity is 57800mPa s (30 ℃, 10s -1 ); select carbon nanoparticles with a particle size of 21nm as the catalyst; mix the oil sample, nano catalyst and hydrogen donor (tetrahydronaphthalene) according to a certain ratio, wherein the oil sample volume is 20mL, and the catalyst concentration is 0.5wt% , the hydrogen-donating agent concentration is 1wt%; microwave heating is carried out on the prepared oil sample, using the gradient temperature rise method, heating for 2 minutes, pausing for 4 minutes, and repeating this cycle 10 times, accumulatively heating for 20 minutes; as attached figure 1 As shown, during the heating process, the temperature of the oil sample was collected in real time by thermocouple and Libview software; the fluidity, viscosity and family component changes of the oil ...

Embodiment 2

[0027] Example 2 (using a catalyst with a larger particle size for comparison): As described in Example 1, the difference is that the catalyst is replaced by carbon nanoparticles with a particle size of 80 nm.

Embodiment 3

[0028] Example 3 (comparison using a catalyst with a larger particle size): As described in Example 1, the difference is that the catalyst is replaced by carbon nanoparticles with a particle size of 6 μm. ;

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Abstract

The invention relates to a new method for efficient cracking and viscosity reduction of thickened oil. according to the method, a nano-catalyst, a hydrogen donor, thickened oil and a microwave heating system, etc. are mainly included, and problems of long time, high temperature, environmental pollution and the like in a conventional viscosity-reducing method can be solved. The method belongs to the field of oil recovery enhancement. The technical key point is as follows: a few nano-particles with high dielectric constant are added into the thickened oil; under the action of microwave, the nano-particles are a high-temperature carrier and a catalyst; and by breaking matrix branches such as C-S bond in thickened oil molecules, the efficient cracking and viscosity-reducing effect is achieved. It shows through researches that by the adoption of a carbon nano-catalyst (particle size being 21nm) in combination of microwave heating, viscosity of thickened oil can be greatly reduced (viscosity reduction rate being 96%), lightweight components are remarkably increased, heavyweight components are reduced, fluidity of crude oil after cracking is effectively maintained, and efficient cracking and viscosity reduction of thickened oil under conditions of low temperature and short time is finally realized. The method of the invention is economic and environmentally friendly, is simple to operate and has a considerable oilfield site application prospect.

Description

technical field [0001] The invention relates to a new method for viscous cracking of heavy oil, which mainly includes nano-catalyst, hydrogen donor, heavy oil and microwave heating system, etc. It has the characteristics of good viscosity-reducing effect, short reaction time, low required temperature, cost saving, etc., and achieves The effect of highly efficient development of heavy oil belongs to the fields of oil recovery engineering and enhanced oil recovery. Background technique [0002] Heavy oil refers to the crude oil degassed at the oil layer temperature, the viscosity of crude oil is greater than 100mPa·s, the relative density is greater than 0.92, and the API gravity is less than 20. It is also called heavy oil and belongs to unconventional oil resources. my country is very rich in heavy oil resources, onshore heavy oil and bitumen resources account for more than 20% of the total oil resources, and the estimated resources are 198×10 8 tons, of which the ultimate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44E21B43/22
Inventor 李克文侯玢池王磊崔屹
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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