Anisotropic Diffusive-Advective Porochemoelasticity Modeling for Inclined Boreholes

2017 ◽  
Vol 17 (3) ◽  
pp. 06016025 ◽  
Author(s):  
Majed F. Kanfar ◽  
Z. Chen ◽  
S. S. Rahman
Keyword(s):  
Inclined Boreholes

Cuttings Transport Simulation in Large-Diameter Inclined Borehole

2019 ◽  
Author(s):  
Yaroslav Ignatenko ◽  
Andrey Gavrilov ◽  
Oleg Bocharov ◽  
Roland May
Keyword(s):  
Steady State ◽  
Unsteady Flow ◽  
Large Diameter ◽  
Drill Pipe ◽  
Stationary Flow ◽  
Problem Formulation ◽  
Cuttings Transport ◽  
Two Phase ◽  
Transport Simulation ◽  
Inclined Boreholes

Abstract An Eulerian mixture model of the two-phase flow was used for cuttings transport simulation. The model was tested using experimental data for particles transport in pipes. Three types of problem statements were analyzed: steady-state flow, non-stationary flow in a short-length channel with periodic boundary conditions, and non-stationary flow in a long channel. Simulation of cuttings transport by Herschel-Bulkley fluid through an inclined 21-inch borehole/–6.5-inch drillpipe annulus was performed. All problem statements showed very close results, even for unsteady flow. These results demonstrated the applicability of 2D steady-state problem formulation for cuttings transport simulation. The unsteady flow was observed for an inclination of less than 20 degrees. Slow downward sliding of cuttings in the lower part of inclined boreholes was observed simultaneously with upstream dunes movement. Drill pipe rotation significantly decreased the cuttings concentration and pressure gradient, and shifted the maximum cuttings transport downward sliding rate from a 20- to 40-degree inclination.

The Effect of Anisotropy of Medium on the Stress State around a Borehole

2011 ◽  
Vol 291-294 ◽  
pp. 2139-2144
Author(s):  
Yong Shu Jiao ◽  
Mu Hui Fan ◽  
Li Juan Li ◽  
Zong Xi Cai
Keyword(s):  
Maximum Shear Stress ◽  
Bedding Plane ◽  
Fracture Analysis ◽  
In Situ Stress ◽  
Stress Changes ◽  
Degree Of Anisotropy ◽  
Inclined Boreholes ◽  
Collapse Failure ◽  
Inclined Borehole

Based on the analytical solution for the stress field around an inclined borehole in an anisotropic medium, a computer program was developed and a serial parametric study was conducted. The effects of parameters such as degree of anisotropy, borehole inclination, bedding plane inclination and in-situ stress conditions on the stress distribution around a borehole were evaluated. The results showed that medium anisotropy has little effect on borehole fracture analysis at low borehole inclinations, but its influence becomes significant for highly inclined boreholes. As the degree of anisotropy varies the maximum shear stress changes remarkably. This indicates that the degree of anisotropy plays a role in the collapse failure of a borehole. The information generated in these studies can be used in predicting the fracture or collapse-initiating pressures.

Analyses of Inclined Boreholes in Poroelastic Media

2004 ◽  
Vol 4 (3) ◽  
pp. 178-190 ◽  
Author(s):  
S. Ekbote ◽  
Y. Abousleiman ◽  
L. Cui ◽  
M. Zaman
Keyword(s):  
Poroelastic Media ◽  
Inclined Boreholes

Lightened Fluid Hydraulics and Inclined Boreholes

1989 ◽  
Author(s):  
M.D. Rankin ◽  
T.J. Friesenhahn ◽  
W.R. Price
Keyword(s):  
Inclined Boreholes

Stability of Highly Inclined Boreholes (includes associated papers 18596 and 18736 )

1987 ◽  
Vol 2 (04) ◽  
pp. 364-374 ◽  
Author(s):  
B.S. Aadnoy ◽  
M.E. Chenevert
Keyword(s):  
Inclined Boreholes
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