Paper Title:
Wellbore Stability Analysis of Coal Seam Based on Hoek-Brown Criterion
  Abstract

Stable evaluation of coal strength is needed in coal well-bore stability analysis. The regular analysis method of wellbore stability adopts Mohr-Coulomb strength criteria to judge the collapse pressure. Coal is dual porosity structure and contains joint fissures richly. Hoek-Brown criterion is much more reasonable to estimate the strength of jointed and fractured rock. So Hoek-Brown criterion is used to analyze the stability of multi-lateral horizontal coal bed methane well. Considering the GSI (geological strength index), structural and surface conditions of coal, the coal and rock mass strength parameters are converted into the underground coal mechanical parameters based on the triaxial test of intact coal. According to the stress state of multi-lateral horizontal well, the borehole collapse formulas are established based on Hoek-Brown Criterion. The effects on the wellbore stability, due to the joint fissures of coal, borehole size, drilling disturbance, are also discussed in this paper.

  Info
Periodical
Advanced Materials Research (Volumes 383-390)
Chapter
Chapter 15: Coatings and Surface Engineering
Edited by
Wu Fan
Pages
3882-3888
DOI
10.4028/www.scientific.net/AMR.383-390.3882
Citation
H. L. Yang, Z. I. Tian, L. S. Zhang, X. Z. Yan, "Wellbore Stability Analysis of Coal Seam Based on Hoek-Brown Criterion", Advanced Materials Research, Vols. 383-390, pp. 3882-3888, 2012
Online since
November 2011
Export
Price
$35.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Guang Tong Feng, Rui He Wang, Hong Shan Zhao, Zong Gang Wang
Chapter 5: Oil and Gas Well Development Projects
Abstract:In carboniferous system of Dzungaria basin, the hard igneous rock greatly decreases the drilling velocity. Gas drilling is probably the only...
1490
Authors: Kan Hua Su, Hong Liu, Jun Wang
Chapter 5: Oil and Gas Well Development Projects
Abstract:The mainly borehole problems are sticking (collapse) and circulation loss in Xujiahe formation of ZJ block, so the drilling rate is very low....
1359
Authors: Tian Jun Zhang, Lei Zhang, Hong Yu Pan, Chao Zhang
Chapter 5: Structural Mechanics, Geotechnical Mechanics and Infrastructure Construction
Abstract:The pattern of stress redistribution in the effect of circular roadway is analyzed and numerical simulation on stability of gas drainage...
330