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A method for indoor remodeling of weakly cemented sandstone

A weak cementation and sandstone technology, applied in the direction of instruments, analytical materials, measuring devices, etc., can solve the problems that are difficult to adapt to the preparation of clay mineral remodeling

Active Publication Date: 2020-10-27
CHINA UNIV OF MINING & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

This type of method is suitable for extremely weakly cemented soft rocks, and it is difficult to adapt to the remolding preparation of sandstones with low clay mineral content.

Method used

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Experimental program
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Embodiment Construction

[0017] The indoor remodeling method of the weakly cemented sandstone of the present invention implements crushing, pressing and sintering on the premise of ensuring that the main material composition is the same as that of the original rock. High-temperature sintering improves the controllability of the cementation strength of particles below the micron level, and the presence of millimeter-sized particles increases the porosity in the remodeled sandstone to offset the densification induced by high-temperature sintering, so that the remodeled sandstone has particle characteristics similar to those of the original rock. Pore ​​features; the specific steps are as follows:

[0018] Step 1: Perform ordinary mechanical crushing on the weakly cemented rock core taken from the target formation, and screen out sand particles in the order of millimeters;

[0019] Step 2: Intensify the crushing of the weakly cemented sandstone from the target formation on the ball mill until the particl...

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Abstract

The invention discloses a method for indoor remodeling of weakly cemented sandstone. The method comprises pulverization, pressing and sintering under the premise of ensuring the main material composition the same to that of the original rock. Through high temperature sintering, the controllability of the cementation strength of the particles below a micrometer level is improved. The particles in amillimeter level increase the porosity of the remolded sandstone and offset the densification induced by high temperature sintering so that the remodeled sandstone has similar particle characteristics and pore characteristics as the original rock. The method comprises: acquiring particles below a millimeter level and a micrometer level through ordinary mechanical and ball mill enhanced crushing methods, blending the particle mixture and pure water according to a certain ratio, carrying out pressing molding and carrying out sintering on the molded sandstone sample at a high temperature. The method solves the problem of high on-site coring difficulty of weak cemented sandstone with physical and mechanical characteristics of pelitization, weathering, loosening and softening.

Description

technical field [0001] The invention relates to an indoor remodeling method of weakly cemented sandstone, in particular to a weakly cemented sandstone remodeling method based on the principle of powder sintering. Background technique [0002] Coal production in the west exceeds 70% of the country's total. Therefore, the west will be the main battlefield for my country's coal development and coal mine infrastructure construction in the future. The Cretaceous is the main strata that the wellbore traverses in the western region. Quantitative research on the physical and mechanical properties of Cretaceous weakly cemented sandstone is an important basis for the new wellbore construction technology in this type of formation. However, the Cretaceous weakly cemented sandstone has physical and mechanical properties such as cementation, wind weathering, vibration loosening, and original softening, which make it difficult and challenging to obtain complete cores. [0003] Indoor re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/44C04B35/16C04B35/622
CPCC04B35/16C04B35/622C04B2235/5427C04B2235/5436C04B2235/602C04B2235/656C04B2235/6567G01N1/286G01N1/44
Inventor 赵晓东周国庆梁恒昌杨金宏吕志远
Owner CHINA UNIV OF MINING & TECH
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