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A method for in-situ mining of oil shale

A technology of in-situ mining and oil shale, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of long electric heating time, kerogen needs to be improved, and low safety

Active Publication Date: 2021-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, patent document CN103361100A discloses a process for extracting oil shale using solvent supercritical or subcritical, and patent document CN103074096A proposes a device for extracting shale oil with supercritical fluid and a method for extracting shale oil using the device , but these methods can only be applied to surface dry distillation, not suitable for underground in-situ oil shale exploitation
[0008] It can be seen that the existing in-situ mining methods have problems such as high energy consumption and low safety due to long electric heating time
In addition, in the in-situ mining method, the conversion rate of kerogen is generally 50%. In order to improve the mining efficiency, the conversion rate of kerogen also needs to be improved

Method used

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  • A method for in-situ mining of oil shale

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Embodiment approach

[0037] According to one embodiment, the proppant containing magnetic nano-catalyst is prepared by the following method:

[0038] a. Contact the mixed solution of ferric salt and ferrous salt with alkaline aqueous solution to form Fe through hydrolysis and crystallization 3 o 4 particle;

[0039] b. Fe 3 o 4 Particles as carriers, in the Fe 3 o 4 supporting the transition metal on the particles to prepare supported catalyst particles;

[0040] c. ultrasonically stirring the supported catalyst particles in water for 0.5-2 hours, so that the particles are evenly dispersed in water to obtain the first dispersion system;

[0041] d. Mix the first dispersion system with the proppant, and ultrasonically stir for 0.5-2 hours to obtain the second dispersion system;

[0042] e. Centrifuge the second dispersion system, and heat the solid obtained after centrifugation at 150-200° C. for 5-10 hours to obtain the proppant containing the magnetic nano-catalyst.

[0043]In step a, the...

Embodiment

[0054] The method for in-situ mining of oil shale in this embodiment is as follows: figure 1 shown.

[0055] The oil shale in a certain place is deeply buried, generally 300-500m, and must be exploited underground. The average thickness of the oil shale reservoir 4 is about 26m, the average oil content is as high as 13%, and the total water content is 4%. The method specifically includes:

[0056] (1) Drill two vertical wells from the surface of the oil shale distribution area to penetrate the oil shale reservoir 4: one is a heating well 1 and the other is a production well 2, and the spacing between the wells is about 50m, and they are completed with casing;

[0057] (2) Preparation of magnetic nanoparticles by hydrolysis: ferric salt (Fe 3+ ) and ferrous salt (Fe 2+ ) is directly added to ammonia water, and the iron salt is instantly hydrolyzed and crystallized to form Fe 3 o 4 Nanoparticles (average particle size is 250nm);

[0058] (3) with the Fe 3 o 4 Nanoparticl...

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Abstract

The invention relates to the technical field of oil shale exploitation, and provides a method for in-situ exploitation of oil shale; the method comprises: 1) drilling at least two wells on the surface of the oil shale distribution area to the oil shale reservoir; 2) Transforming the oil shale reservoir to create cracks; 3) injecting a proppant containing magnetic nano-catalysts into the oil shale reservoir so that it is distributed in the cracks of the oil shale reservoir; 4) Put the heater into the heating well to heat the oil shale reservoir; under the heating condition, under the action of the magnetic nano-catalyst, the kerogen in the oil shale reservoir is cracked into shale-containing 5) export the output to the surface through the production well, and separate and collect it. The invention can reduce the pyrolysis temperature of the oil shale during the heating process of the oil shale, accelerate the transformation of immature kerogen into oil and gas resources and increase the conversion rate, reduce the viscosity of the crude oil and improve the quality of the crude oil.

Description

technical field [0001] The invention relates to the technical field of oil shale exploitation, in particular, it provides a method for in-situ exploitation of oil shale. Background technique [0002] Oil shale is a very fine-grained sedimentary rock containing a large amount of immature organic matter or kerogen. my country's oil shale resources are very rich. According to the report of a new round of oil and gas resource evaluation commissioned by Jilin University in 2005 by the Ministry of Land and Resources, my country's oil shale resources converted into shale oil resources are 47.644 billion tons, and shale oil can be recycled. It is 11.979 billion tons, second only to the United States, ranking second in the world. Compared with the geological characteristics of oil shale in the United States, my country's oil shale resources are buried deep. The average thickness of oil shale is 20-30m, and most of them are sandwiched with sandstone and mudstone. There are few rich or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/241E21B43/267
CPCE21B43/241E21B43/267
Inventor 汪友平苏建政龙秋莲张汝生王益维孟祥龙高媛萍郭鹏高诚
Owner CHINA PETROLEUM & CHEM CORP
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