Hongyuan Zhang

TL;DR: In this paper, a review of the current developments of liquid nitrogen (LN2) fracturing technology from several aspects, including the effect of thermal shock on rock physical properties, the heat transfer characteristics of LN2, the rock-breaking performance of an LN 2 jet, and the applications and limitations of cryogenic fracturing technology.

TL;DR: In this paper, a set of experiments were conducted to investigate the characteristics of thermal cracks in hot dry rock (HDR) reservoirs, where granite specimens with temperatures ranging from 200 to 300 degrees were impacted by a low-pressure liquid nitrogen jet.

TL;DR: In this paper, the authors presented a numerical analysis of thermal characteristics in bottomhole rock during liquid nitrogen jet fracturing for hot dry rock (HDR) reservoirs, where the standard κ-e and Darcy models were employed to calculate the fluid flow in fluid region and porous-rock region respectively.

TL;DR: In this article, a coupled thermal-hydraulic model has been developed to simulate the heat extraction process in an EGS as a function of different fracture configurations, and the proposed model is validated against analytical solutions.

TL;DR: In this article, a stress-disturbance numerical model was presented for an infinite elastic coal formation that uses a high-order, staggered grid finite-difference scheme and boundary conditions that combine a perfectly matched layer with a quasi-static confining pressure load.