Minsu Cha

TL;DR: In this paper, the feasibility of fracture stimulation by using cryogenic fluids to create a strong thermal gradient generating local tensile stress in the rocks surrounding a borehole was investigated, and the results showed that increasing the number of cryogenic stimulations enhanced fracturing by both creating new cracks as well as widening the existing cracks.

TL;DR: In this article, the capacity and applicability of cryogenic fracturing using liquid nitrogen are demonstrated and examined, and the efficacy of liquid nitrogen in enhancing fracture initiation and propagation in concrete samples, and shale and sandstone reservoir rocks.

TL;DR: In this paper, the capacity and applicability of cryogenic fracturing using liquid nitrogen are demonstrated and examined, and the efficacy of liquid nitrogen in enhancing fracture initiation and propagation in concrete samples, and shale and sandstone reservoir rocks.

TL;DR: In this paper, the small-strain shear modulus depends on stress in uncemented soils and is measured by fitting the power equation to velocity measurements conducted at different effective stress levels, so changes in both contact stiffness and soil fabric are inherently involved.

TL;DR: Cha et al. as mentioned in this paper developed a laboratory system for cryogenic fracturing under true-triaxial loading, with liquid nitrogen (LN)delivery/control and measurement systems.