This study elucidates the possibility of CO2 injection-induced formation of a complex cloud-
fracture network (CFN) in granite, along with shearing (shear slip) of natural pre-existing …

Artificial intelligence (AI) is revolutionizing several businesses across the world, and its
implementation in drilling engineering has enhanced the performance of oil and gas …

Wellbore instability presents a formidable challenge in drilling engineering, significantly
hindering the exploitation of geothermal energy and deep oil and gas resources. However …

Recent researches have proposed the use of enhanced geothermal system reservoirs
consisting of dense networks of microfractures, created by hydraulic and/or thermal …

Wellbore instability is one of the key factors limiting safe and efficient drilling in hot dry rock.
A detailed understanding of the instability mechanism of hot dry rock wellbore is essential to …

The tensile strength of rock materials, a crucial factor for the stability of underground
engineering, is much lower than its compressive strength. Moreover, the tensile strength of …

The deformation and failure characteristics of rock caused by periodic changes of
temperature are not only significantly different from that under normal temperature, but also …

Complicated geological conditions such as high geo-stress and high ground temperatures
often have a significant impact on the mechanical behavior and failure potential of hard …

This article is a summary of the author's thesis (Goto, 2023). The thesis was chosen for the
best thesis award by the Japanese Society for Rock Mechanics (JSRM). A novel …

In this chapter, of which the contents have been published as Pramudyo et al.(2021), the
author discusses the results of CO2 fracturing experiments in granite at conventional and …