Hydraulic Fracturing Treatment of Low-Permeability Coal Seam Gas Reservoirs with Finely Layered Coals

2018 ◽  
Author(s):  
Xi Zhang ◽  
Bisheng Wu ◽  
Luke Connell ◽  
Yanhui Han ◽  
Robert Jeffrey
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Low Permeability ◽  
Coal Seam Gas ◽  
Gas Reservoirs

Effective application of proppants during the hydraulic fracturing of coal seam gas reservoirs: Implications from laboratory testings of propped and unpropped coal fractures

Fuel ◽  
2021 ◽  
Vol 304 ◽  
pp. 121394
Author(s):  
M.A.A. Ahamed ◽  
M.S.A. Perera ◽  
D. Elsworth ◽  
P.G. Ranjith ◽  
S.K.M. Matthai ◽  
...  
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Coal Seam Gas ◽  
Gas Reservoirs ◽  
Effective Application

scholarly journals Stable Dispersion of Coal Fines during Hydraulic Fracturing Flowback in Coal Seam Gas Reservoirs—An Experimental Study

2020 ◽  
Vol 34 (5) ◽  
pp. 5566-5577 ◽  
Author(s):  
Faisal Ur Rahman Awan ◽  
Alireza Keshavarz ◽  
Hamed Akhondzadeh ◽  
Sarmad Al-Anssari ◽  
Ahmed Al-Yaseri ◽  
...  
Keyword(s):  
Experimental Study ◽  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Coal Seam Gas ◽  
Gas Reservoirs ◽  
Stable Dispersion ◽  
Coal Fines

Effect of coal maturity on CO2-based hydraulic fracturing process in coal seam gas reservoirs

Fuel ◽  
2019 ◽  
Vol 236 ◽  
pp. 179-189 ◽  
Author(s):  
K.H.S.M. Sampath ◽  
M.S.A. Perera ◽  
D. Elsworth ◽  
P.G. Ranjith ◽  
S.K. Matthai ◽  
...  
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Coal Seam Gas ◽  
Gas Reservoirs ◽  
Fracturing Process

scholarly journals A Generic Method for Predicting Environmental Concentrations of Hydraulic Fracturing Chemicals in Soil and Shallow Groundwater

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 941 ◽  
Author(s):  
Dirk Mallants ◽  
Elise Bekele ◽  
Wolfgang Schmid ◽  
Konrad Miotlinski ◽  
Andrew Taylor ◽  
...  
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Shallow Groundwater ◽  
Solute Concentration ◽  
Coal Seam Gas ◽  
Transport Modelling ◽  
Environmental Concentrations ◽  
Modelling Framework ◽  
Recharge Rates ◽  
Migration Pathways

Source-pathway-receptor analyses involving solute migration pathways through soil and shallow groundwater are typically undertaken to assess how people and the environment could come into contact with chemicals associated with coal seam gas operations. For the potential short-term and long-term release of coal seam gas fluids from storage ponds, solute concentration and dilution factors have been calculated using a water flow and solute transport modelling framework for an unsaturated zone-shallow groundwater system. Uncertainty about dilution factors was quantified for a range of system parameters: (i) leakage rates from storage ponds combined with recharge rates, (ii) a broad combination of soil and groundwater properties, and (iii) a series of increasing travel distances through soil and groundwater. Calculated dilution factors in the soil increased from sand to loam soil and increased with an increasing recharge rate, while dilution decreased for a decreasing leak rate and leak duration. In groundwater, dilution factors increase with increasing aquifer hydraulic conductivity and riverbed conductance. For a hypothetical leak duration of three years, the combined soil and groundwater dilution factors are larger than 6980 for more than 99.97% of bores that are likely to be farther than 100 m from the source. Dilution factors were more sensitive to uncertainty in leak rates than recharge rates. Based on this dilution factor, a comparison of groundwater predicted environmental concentrations and predicted no-effect concentrations for a subset of hydraulic fracturing chemicals used in Australia revealed that for all but two of the evaluated chemicals the estimated groundwater concentration (for a hypothetical water bore at 100 m from the solute source) is smaller than the no-effect concentration for the protection of aquatic ecosystems.

Experimental Study on Deep Borehole Pre-Cracking Blasting of Drilling through Strata at Low Permeability Seam

2013 ◽  
Vol 868 ◽  
pp. 339-342
Author(s):  
Jian Liu ◽  
Qian Le
Keyword(s):  
Coal Seam ◽  
Control Area ◽  
Low Permeability ◽  
Gas Extraction ◽  
Test Results ◽  
Deep Borehole ◽  
Coal Seam Gas ◽  
Gas Concentration ◽  
Working Face ◽  
Outburst Coal Seam

In the process of roadway excavation in the low permeability outburst coal seam, with drilling through strata in the bottom drainage roadway extracting coal seam gas of control area. In order to improve extraction effect, the method that deep borehole pre-cracking blasting is used to increase the permeability of coal in the drilling through strata seam segment is proposed. The calculation formula on crushing circle and crack circle radius of deep borehole pre-cracking blasting are derived, and the effective loosening radius of blasting is calculated in theory, the research achievements are applied to field test, the test results show that deep borehole pre-cracking blasting permeability improvement technology is carried out in the drilling through strata of the low permeability outburst coal seam, the permeability of coal seam is improved by 180 times, the gas extraction scalar is raised by 8-10 tomes, during the process of roadway excavation, gas concentration of the working face is 0.2%-0.3%, and tunneling footage is increased by 2 times.

Graded Proppant Injection into Coal Seam Gas and Shale Gas Reservoirs for Well Stimulation

2015 ◽  
Author(s):  
Alireza Keshavarz ◽  
Alexander Badalyan ◽  
Themis Carageorgos ◽  
Pavel Bedrikovetsky ◽  
Ray Johnson
Keyword(s):  
Coal Seam ◽  
Shale Gas ◽  
Coal Seam Gas ◽  
Gas Reservoirs ◽  
Well Stimulation ◽  
Shale Gas Reservoirs
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