Chinese Academy of Sciences

Zhongming Zhou

Xiao Dong Li

Shouding Li

Yanhui Liu

Bo Zheng

Jianming He

Zhenxing Zhang

Linan Liu

A rock mechanics triaxial testing machine includes an outer pressure chamber and an inner pressure chamber located inside the outer pressure chamber, and a side wall of the inner pressure chamber is provided with a communication hole communicating with the outer pressure chamber; an upper pressure head and a lower pressure head which may be placed inside the inner pressure chamber; an axial pressure driving member, the axial pressure driving member may drive the upper pressure head and lower pressure head to approach each other to squeeze the rock sample; an axial deformation sensor, a radial deformation sensor, a lifting mechanism, the lifting mechanism may drive the inner pressure chamber to rise and fall. In the rock mechanics triaxial testing machine, the inner pressure chamber and the outer pressure chamber are nested indoors and outdoors, and the inner pressure chamber is used to quickly mount rock test samples.

Rock mechanics triaxial testing machine has shaft pressure driving piece and lifting mechanism driving inner pressure chamber to lift

The present invention improves the precision in observing cracks in rocks during a hydraulic fracturing test, improving a scientific understanding of the regular pattern of development cracks in of hydraulically fractured rocks. The technical solution includes: hydraulically fracturing the rock with aqueous solutions containing an interventional contrast-enhanced agent, forming hydraulically fractured cracks, wherein the difference in a mass attenuation coefficient &#x3bc;/&#x3c1; of x-rays between the cracks and the rock is improved by the interventional contrast-enhanced agent in the cracks, moreover, the difference in mass energy absorption coefficient &#x3bc;/&#x3c1; of x-rays between the cracks and the rock is improved, then the linear attenuation coefficient of the reception of the detector is changed, improving the imaging resolution for hydraulically fractured cracks in the rock.

Enhanced interventional CT imaging of cracks in rocks during hydraulic testing

A method for imaging three-dimensional topography with high precision, which overcomes the disadvantage and deficiency of low precision in observing three-dimensional topography of hydraulically fractured cracks of rocks, improve the precision in observing three-dimensional topography of cracks in rock hydraulic fracturing test, and benefit for scientifically understanding regular pattern of development of hydraulically fractured cracks of rocks. The technical solution comprises: hydraulically fracturing the rock with aqueous solution containing fluorine nuclides; forming hydraulically fractured cracks; in the process of fracturing, loading a fracturing apparatus while rotating the same; emitting an x-ray beam from an x-ray source, which penetrates the rock and reaches a CT detector; optical signals transmitted by the fluorine nuclides inside the rock being received by a high resolution planar array SiPM detector for nuclides; performing image fusion of nuclides tomographic scanning data and CT data to implement high precision imaging for three-dimensional topography of cracks in rocks.

Method for high precision imaging for three-dimensional topography of cracks in hydraulic fracturing test of rocks

Growing community of inventors

Beijing, China

Zhongming Zhou