Interface waves propagating along tensile fractures in dolomite

1995 ◽  
Vol 22 (20) ◽  
pp. 2773-2776 ◽  
Author(s):  
Sanjit Roy ◽  
Laura J. Pyrak-Nolte
Keyword(s):  
Interface Waves ◽  
Tensile Fractures

Numerical Simulation of Gas Injection for CBM Openhole Cavity Completion Considering the Coal Vertical Fracture System

2011 ◽  
Vol 101-102 ◽  
pp. 298-301
Author(s):  
Xiao Yi Li ◽  
Zhi Ming Wang ◽  
Xin Wan ◽  
Yang Cao
Keyword(s):  
Coalbed Methane ◽  
Displacement Vector ◽  
Fluid Velocity ◽  
Stress Gradient ◽  
Fracture System ◽  
Vertical Fracture ◽  
Matrix Deformation ◽  
Vector Distribution ◽  
Tensile Fractures ◽  
Coal Reservoir

A discrete element numerical model simulating the process of gas pressurization in coalbed methane wells is built based on UDEC software. The model considers the unique vertical fracture system of the coal. Simulates the distribution of effective stress, pore pressure and the node displacement vector around the wellbore in the process of pressurization under different terrestrial stress conditions. The analysis shows that, reservoir fluid flow and matrix deformation in the pressurization of cavity completion can be better represented by taking coal's unique fracture system into consideration. Coal reservoir with anisotropic stress is more prone to rupture and collapse than that under isotropic condition. In the vertical fracture system, the discrepancy of the fluid velocity will lead to differences in formation stress gradient and help generate shearing fracture. Tensile fractures’ formation and growing trend can be reflected by nodal displacement vector distribution.

The Effect of a Thin Layer Surface Inhomogeneity on Dynamic Surface Response

1978 ◽  
Vol 45 (1) ◽  
pp. 95-99 ◽  
Author(s):  
L. M. Brock
Keyword(s):  
Thin Layer ◽  
Half Space ◽  
Critical Parameter ◽  
Rigid Bodies ◽  
Layer Surface ◽  
Noticeable Effect ◽  
Dynamic Surface ◽  
Surface Inhomogeneity ◽  
Interface Waves ◽  
Surface Response

A thin layer surface inhomogeneity consisting of small, evenly distributed rigid bodies is perfectly bonded to an elastic half space. Constant normal and shear line loads are applied to the layer and the dynamic surface response is calculated by Laplace transform techniques. The product of the layer thickness and the rigid body/half-space mass densities proves to be a critical parameter in determining the response. It is found that the layer has a noticeable effect on the half-space surface response in relation to the free-surface behavior. In particular, while no standard surface-interface waves exist, evidence for small values of the critical parameter indicates the presence of pseudo-Rayleigh waves similar to those found in fluid-solid interface analyses.

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