LAPSE:2019.0022
Published Article
LAPSE:2019.0022
Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array
Yiyu Lu, Shaojie Zuo, Zhaolong Ge, Songqiang Xiao, Yugang Cheng
January 7, 2019
High-pressure hydraulic fracturing technology in coal and coal bed methane mines can lead to roof and floor damage, and fracture initiation disorder that leads to a “blank area”, and other issues. A new method of hydraulic fracturing is proposed to increase the homogeneous permeability of coal in underground coalmines. Numerical and other simulation tests for different forms of a tree-type, branched borehole model are presented. The results show that the branched array causes cracks to initiate from the bottom of the array, and these extend along the direction of the adjacent boreholes. Generally, as the number of branched boreholes increases, the coal seam fracture network also increase, improving the distribution of the fracture network, making the fracturing effect better. The branched boreholes appear to reduce initiation pressure and, with increasing branches, the initiation pressure decreases. A model with four tree-type, branched boreholes leads to a reduction in initiation pressure of 69%. In terms of permeability improvement technology in underground coalmines, a branched hydraulic fracturing borehole array has the advantages of reducing initiation pressure, controlling crack initiation and extension, enhancing the fracturing effect and reducing the destruction of the roof and floor.
Keywords
acoustic emission, coal bed methane, coal permeability, hydraulic fracturing, tree-type borehole array
Subject
Suggested Citation
Lu Y, Zuo S, Ge Z, Xiao S, Cheng Y. Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array. (2019). LAPSE:2019.0022
Author Affiliations
Lu Y: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seams, Chongqing University, Chongqing 400044, China
Zuo S: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seams, Chongqing University, Chongqing 400044, China
Ge Z: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seams, Chongqing University, Chongqing 400044, China
Xiao S: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seams, Chongqing University, Chongqing 400044, China
Cheng Y: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seams, Chongqing University, Chongqing 400044, China
[Login] to see author email addresses.
Journal Name
Energies
Volume
9
Issue
7
Article Number
E514
Year
2016
Publication Date
2016-06-30
Published Version
ISSN
1996-1073
Version Comments
Original Submission
Other Meta
PII: en9070514, Publication Type: Journal Article
Record Map
Published Article

LAPSE:2019.0022
This Record
External Link

doi:10.3390/en9070514
Publisher Version
Download
Files
Jan 7, 2019
Main Article
License
CC BY 4.0
Meta
Record Statistics
Record Views
524
Version History
[v1] (Original Submission)
Jan 7, 2019
 
Verified by curator on
Jan 7, 2019
This Version Number
v1
Citations
Most Recent
This Version
URL Here
https://psecommunity.org/LAPSE:2019.0022
 
Original Submitter
Calvin Tsay
Links to Related Works
Directly Related to This Work
Publisher Version