Open AccessCoupled flow-geomechanics studies on the role of hydrofracturing and secondary fracturing in CO2-enhanced coalbed methane
Author(s) -
Chaobin Guo,
Quanlin Feng,
Tianran Ma,
Siqi Wang,
Rui Zhou,
Bo Wang
Publication year - 2021
Publication title -
energy exploration and exploitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 30
eISSN - 2048-4054
pISSN - 0144-5987
DOI - 10.1177/0144598720985278
Subject(s) - coalbed methane , petroleum engineering , caprock , hydraulic fracturing , geomechanics , methane , reservoir simulation , coal , greenhouse gas , permeability (electromagnetism) , tight gas , geology , environmental science , coal mining , waste management , geotechnical engineering , engineering , chemistry , biochemistry , oceanography , organic chemistry , membrane
CO 2 -enhanced coalbed methane (CO 2 -ECBM) can improve coalbed methane production efficiency and simultaneously alleviate greenhouse gas emissions. In this paper, we integrated TOUGH2 and FLAC3D numerical simulation software to conduct hydro-mechanical coupling analysis for effects of hydrofracturing and secondary fracturing in CO 2 -ECBM. The simulation results show that the hydrofracturing and secondary fracturing treatments significantly increase the coal seam interconnectivity, enhancing overall injection and production. The reduction of the pore pressure near injection wells can effectively reduce the damage of gas injection well. Moreover, secondary fracturing can even increase cumulative gas production up to 32.5%. In addition to rising fracture density, increasing the fracture length is also considered an efficacious procedure for enhancing permeability in the secondary fracturing process.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom