Parametric analysis of slotting operation induced failure zones to stimulate low permeability coal seams
File(s)
Published version
Author(s)
Si, G
Durucan, S
Shi, JQ
Korre, A
Cao, W
Type
Journal Article
Abstract
The main constrain for effective gas drainage in coal mines is the low permeability nature of coal reservoirs. As coal mining activities are extending to deeper subsurface, the ever-increasing in situ stress conditions is anticipated to result in much lower permeability and more challenges for gas emission control in coal mines. In recent years, hydraulic slotting using high-pressure waterjet along underground gas drainage boreholes, as a general solution to stimulate low permeability coal seams, has become increasingly favourable. This paper presents a systematic investigation into the sensitivity of borehole slotting performance to a number of field and operational parameters. A wide range of geomechanical properties, in situ stress conditions, slot geometry and spacing of multiple slots were considered in a series of numerical simulations. The relations between these key parameters and the failure zone size/volume induced by slotting were quantified. The effect of different parameters in improving slotting performance has also been ranked, which provides theoretical base for mine operators to optimise slotting operations.
Date Issued
2019-01-31
Date Acceptance
2018-08-13
Citation
Rock Mechanics and Rock Engineering, 2019, 52 (1), pp.163-182
ISSN
0723-2632
Publisher
Springer
Start Page
163
End Page
182
Journal / Book Title
Rock Mechanics and Rock Engineering
Volume
52
Issue
1
Copyright Statement
© 2018 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Sponsor
Commission of the European Communities
Commission of the European Communities
Grant Number
FRCR-CT-2015-00005
RFCR-CT-2014-00004
Subjects
Science & Technology
Technology
Physical Sciences
Engineering, Geological
Geosciences, Multidisciplinary
Engineering
Geology
Parametric analysis
Borehole slotting
Permeability stimulation
Numerical modelling
GAS OUTBURSTS
STRESS
DYNAMICS
EXTRACTION
BOREHOLES
DRAINAGE
IMPACT
MODEL
Geological & Geomatics Engineering
0905 Civil Engineering
0914 Resources Engineering and Extractive Metallurgy
Publication Status
Published
Date Publish Online
2018-09-03