Handling flow through fractured media is critical for transient pressure and flow analysis in shale gas reservoirs, because gas production from such low-permeability formations relies on fractures, from hydraulic fractures and fracture network to various-scaled natural fractures, to provide flow channels for gas flow into producing wells. This study presents a numerical investigation of pressur...

Various structural discontinuities, which form a discrete fracture network, play a significant role in the failure conditions and stability of the rock masses around underground excavations. Several continuum numerical methods have been used to study the stability of underground excavations in jointed rock masses but only few of them can take into account the influence of the pre-existing natur...

The water leak-off during hydraulic fracturing in shale gas reservoirs is a complicated transport behavior involving thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. Although many leak-off models have been published, none of the models fully coupled the transient fluid flow modeling with heat transfer, chemical-potential equilibrium and natural-fracture dilation phenome...

Researchers have recently realized thatsilty laminas are very developed in naturally fractured continentalsedimentary formations in the Ordos Basin(China). Studies have shown that silty laminas are significant to improve the physical properties and gas storage capacity, and the natural fractures interact with the hydraulic fractures to maximize the fracture network during hydraulic fracturing. ...

Abstract Natural fracture data from one of the Carboniferous shale masses in eastern Qaidam Basin were used to establish a stochastic model discrete network and perform element simulation research on size effect mechanical parameters shale. Analytical solutions fictitious joints transversely isotropic media derived, which made it possible for proposed numerical simulate bedding natural fracture...

In this work, we used a grain-based numerical model based on the concept of lattice. The modelling was done to simulate the lab experiments carried out on the mortar samples. Also the analytical solutions corresponding to the viscosity-dominated regime were used to estimate the fracture length and width, and the results obtained were compared with the numerical simulations. As the analytical so...

Abstract: The oil recovery factor from shale oil remains low, about 5 to 7% of the oil in place. How to increase oil recovery from shale oil reservoirs is attracting more and more attention. CO2 huff-and-puff was historically considered one of the best approaches to improve the oil rate. Most previous simulation studies have been based on dual porosity, but simulation results from dual-porosity...

that “nonvertebral fracture incidence was significantly lower in the teriparatide group than in the alendronate group.” That is technically true, but it is misleading. It is generally accepted that fractures of the toes and feet are not related to osteoporosis, and fractures of the ribs and ankles are usually not included in clinical trials to evaluate the effect of medications on osteoporotic ...

introduction: the main purpose of this study was to evaluate the prevalence of ophthalmic injuries associated with mid-facial fractures in patients admitted to shahid beheshti university hospital in babol, iran, from 2002 to 2012. materials and methods: a cross-sectional, retrospective study was undertaken to determine the prevalence of ophthalmic injuries associated with mid-facial fractures i...