Numerical analysis of the downhole flow field with compressible fluid in hydrothermal jet drilling

2018 ◽  
Vol 132 ◽  
pp. 322-334 ◽  
Author(s):  
Zehao Lyu ◽  
Xianzhi Song ◽  
Gensheng Li
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Compressible Fluid ◽  
Hydrothermal Jet

Comparison of numerical analysis on the downhole flow field for multi-orifice hydrothermal jet drilling technology for geothermal wells

Geothermics ◽  
2017 ◽  
Vol 70 ◽  
pp. 314-323 ◽  
Author(s):  
Xianzhi Song ◽  
Zehao Lyu ◽  
Liu Cui ◽  
Gensheng Li ◽  
Guodong Ji ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Drilling Technology ◽  
Geothermal Wells ◽  
Hydrothermal Jet

Numerical Analysis of the Turbulent Flow Field Applied to Thermal Spallation Drilling

2004 ◽  
Author(s):  
Angela O. Nieckele ◽  
Luis Fernando Figueira da Silva ◽  
Joa˜o Carlos R. Pla´cido
Keyword(s):  
Reynolds Number ◽  
Numerical Analysis ◽  
Flow Field ◽  
Gas Phase ◽  
Accurate Determination ◽  
Rock Surface ◽  
Drilling Technique ◽  
High Reynolds ◽  
Drilling Conditions ◽  
Volume Method

Thermal spallation is a possible drilling technique which consists of using hot supersonic jets as heat source to perforate hard rocks at high rates. This work presents a numerical analysis of a typical spallation drilling configuration, by the finite volume method. The time-averaged conservation equations of mass, momentum and energy are solved to determine the turbulent compressible gas phase flow field. Turbulence is predicted by the classical high Reynolds number κ-ε model, as well as with a low Reynolds number κ-ε model. The influence of the jet Reynolds number is investigated. Special attention is given to the rock surface temperature, since its accurate determination is required to predict spallation rates under field-drilling conditions.

Numerical analysis of the acoustic and flow field associated with perforated liners with variable acoustic forcing

2013 ◽  
Author(s):  
Cosimo Bianchini ◽  
Antonio Andreini ◽  
Bruno Facchini ◽  
Ignazio Vitale ◽  
Fabio Turrini
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Acoustic Forcing

Grinding Fluid Flow Field Modeling and Multi-Parameter Numerical Analysis Based on Smooth Model

2010 ◽  
Vol 156-157 ◽  
pp. 948-955
Author(s):  
Guang Yao Meng ◽  
Ji Wen Tan ◽  
Yi Cui
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
Flow Field ◽  
Dynamic Pressure ◽  
Grinding Wheel ◽  
Lubricating Film ◽  
Fluid Field ◽  
Grinding Fluid ◽  
Smooth Model ◽  
Area Increase

Relative motion between grinding wheel and workpiece makes the lubricant film pressure formed by grinding fluid in the grinding area increase, consequently, dynamic pressure lubrication forms. The grinding fluid flow field mathematical model in smooth grinding area is established based on lubrication theory. The dynamic pressure of grinding fluid field, flow velocity and carrying capacity of lubricating film are calculated by the numerical analysis method. An analysis of effect of grinding fluid hydrodynamic on the total lifting force is performed, and the results are obtained.

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