Usefulness of Three Dimensional Reconstructive Images for Thoracic Trauma Induced Fractures

2006 ◽  
Vol 55 (3) ◽  
pp. 247
Author(s):  
Kyung Hun Koh ◽  
Dong Hun Kim ◽  
Young Sook Kim ◽  
Joo Nam Byun
Keyword(s):  
Thoracic Trauma ◽  
Three Dimensional ◽  
Induced Fractures

Three-Dimensional Study of Unsteady Flow in Fractured Horizontal Wells

2009 ◽  
Vol 283-286 ◽  
pp. 256-261
Author(s):  
N. Mimouni ◽  
Salahs Chikh
Keyword(s):  
Control Volume ◽  
Three Dimensional ◽  
Geometrical Parameters ◽  
Optimum Number ◽  
Numerical Predictions ◽  
Fractured Horizontal Well ◽  
Hybrid Grid ◽  
Diffusivity Equation ◽  
Induced Fractures ◽  
Fractured Horizontal Wells

Numerical predictions are carried out in order to investigate the fractured horizontal well behaviour. A control volume based approach is used to solve the transient 3D diffusivity equation adopting an irregular hybrid grid. Effect of several parameters such as reservoir characteristics, fracture properties and physical and geometrical parameters of the reservoir and the well that may affect the well productivity and production are discussed. Simulation results allow to predict the optimum number of induced fractures.

scholarly journals Shear-induced fractures and three-dimensional motions in an organogel

2008 ◽  
Vol 77 (1) ◽  
Author(s):  
Pauline Grondin ◽  
Sébastien Manneville ◽  
Jean-Luc Pozzo ◽  
Annie Colin
Keyword(s):  
Three Dimensional ◽  
Induced Fractures

scholarly journals Numerical Investigation for Three-Dimensional Multiscale Fracture Networks Based on a Coupled Hybrid Model

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6354
Author(s):  
Xulin Du ◽  
Linsong Cheng ◽  
Jun Chen ◽  
Jianchao Cai ◽  
Langyu Niu ◽  
...  
Keyword(s):  
Hybrid Model ◽  
Three Dimensional ◽  
Fracture Networks ◽  
Gas Reservoirs ◽  
Multi Scale ◽  
Green Element Method ◽  
Induced Fractures ◽  
Fractured Horizontal Wells ◽  
Medium Method ◽  
Numerical Approaches

The mismatching between the multi-scale feature of complex fracture networks (CFNs) in unconventional reservoirs and their current numerical approaches is a conspicuous problem to be solved. In this paper, the CFNs are divided into hydraulic macro-fractures, induced fractures, and natural micro-fractures according to their mode of origin. A hybrid model coupling various numerical approaches is proposed to match the three-dimensional multi-scale fracture networks. The macro-fractures with high-conductivity and wide-aperture are explicitly characterized by a mimetic Green element method-based hierarchical fracture model. The induced fractures and natural micro-fractures that have features of low-conductivity and small-openings are upscaled to the dual-medium grid and enhanced matrix grid through the equivalent continuum-medium method, respectively. Subsequently, some benchmark cases are implemented to confirm the high-precision and high-robustness of the proposed hybrid model that indeed accomplishes accurate modeling of fluid flow in multi-scale CFNs by comparing with commercial software tNavigator®. Furthermore, an integrated workflow of simulation modeling for multiscale CFNs combined with a field example in Sichuan from China is used to analyzing the production information of fractured horizontal wells in shale gas reservoirs. Compared with the field production data from this typical well, it can be proved that the hybrid model has strong reliability and practicability.

Finite Element Analysis of Thermally Induced Stresses in the Near-Wellbore Region During Invasion of Mud Into Fractures

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Ze Wang ◽  
Yuanhang Chen
Keyword(s):  
Finite Element ◽  
Temperature Difference ◽  
Thermal Stresses ◽  
Three Dimensional ◽  
Fracture Propagation ◽  
Transport Processes ◽  
Sensitivity Analyses ◽  
Element Analysis ◽  
Lost Circulation ◽  
Induced Fractures

A severe lost circulation event is usually associated with emanation and propagation of pre-existing or drilling induced fractures from the wellbore. To combat lost circulation and prevent further fracture propagation, a thorough understanding of the stress state in the near-wellbore region with fractures is imperative. However, it is not yet fully understood how temperature variation during the invasion of mud affects pre-existing or newly initiated fractures. A three-dimensional (3D) finite element (FE) analysis was conducted in this study to simulate the transport processes and state of stresses in the near-wellbore region during invasion of mud into fractures. To account for thermal effects, a thermo-poroelasticity model was coupled with flow and heat transfer models in the fractures. This study included a series of sensitivity analyses based on different formation properties and mud loss conditions to delineate the relative importance of different parameters on induced thermal stresses. It also evaluated potential risks of reinitiating fractures under various downhole conditions. The results demonstrate how the stresses redistribute as nonisothermal invasion of mud takes place in fractures. It shows that a temperature difference between the formation rock and the circulating muds can facilitate fracture propagation during invasion of mud. These results due to temperature change can also diminish the enhanced hoop stresses provided by wellbore strengthening (WBS) and other lost circulation prevention methods. Such information is vital to successful lost circulation management. The conclusions of this study are particularly relevant when a substantial temperature difference exists between circulating fluids and surrounding rock, as commonly seen in high-pressure, high-temperature, and deepwater wells.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

Conformation of Ribosomes from Escherichia Coli

1974 ◽  
Vol 32 ◽  
pp. 210-211
Author(s):  
M. Boublik ◽  
W. Hellmann ◽  
F. Jenkins
Keyword(s):  
Binding Sites ◽  
Ribosomal Proteins ◽  
Fluorescent Dyes ◽  
Protein Biosynthesis ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Dimensional Structure ◽  
Complete Understanding ◽  
And Function

The present knowledge of the three-dimensional structure of ribosomes is far too limited to enable a complete understanding of the various roles which ribosomes play in protein biosynthesis. The spatial arrangement of proteins and ribonuclec acids in ribosomes can be analysed in many ways. Determination of binding sites for individual proteins on ribonuclec acid and locations of the mutual positions of proteins on the ribosome using labeling with fluorescent dyes, cross-linking reagents, neutron-diffraction or antibodies against ribosomal proteins seem to be most successful approaches. Structure and function of ribosomes can be correlated be depleting the complete ribosomes of some proteins to the functionally inactive core and by subsequent partial reconstitution in order to regain active ribosomal particles.

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