Multi-stage fracturing of horizontal wells to recover shale gas has attracted substantial
renewed interest in the physical and mechanical characteristics of shale. The mechanical …

The failure criterion is a very important aspect of the wellbore stability analysis. But the Mohr–
Coulomb criterion, a most commonly used failure criterion, is usually too conservative, due …

Chemical and mechanical coupling are the most important factors affecting wellbore
instability. The main objective of this research is to propose a wellbore stability analysis …

As a serious problem in drilling operation, wellbore instability restricts efficient development
of shale gas, especially in formations with weak bedding planes which have strong strength …

The paper presents a numerical wellbore stability model using the finite element method
(FEM). The core driver of the model uses Biot's theory of poroelasticity. The model uses a …

The shale gas reservoirs are usually characterized by tight matrix, rich in clay minerals, well-
developed bedding planes and micro-fissures, which makes it highly water-sensitive and …

To better understand the distribution of three dimensional stress states in the Nankai
subduction zone, southwest Japan, we review various stress-related investigations carried …

A wellbore drilled in pre-stressed formations concentrates the far-field stresses. These
concentrations often lead to borehole instability producing breakouts, drilling-induced …

During the coalbed methane (CBM) exploration and development, in-situ stress and
permeability are two vital reservoir evaluation parameters. In this work, with the …

Geophysical logs collected from a deep borehole drilled into the North American Craton in
Northeastern Alberta shed valuable light on the state of stress in stable cratons. Observed …