Abstract
Water-based fracking fluids are currently used to enhance the gas production from unconventional gas reservoirs, while the formation damage due to the interaction between rock matrix and residual water significantly reduce the pore space available for gas movement. In this paper, the effect of different fracturing fluids on fracture permeability is investigated using the same fractured siltstone sample in five rounds of cycling test (CO2-CO2-CO2-water-CO2). The experimental results reveal that the maximum confining pressure dominated fracture permeability. The fracture permeability for CO2 at 10MPa confining pressure decreased by around 75% after applying 40MPa confining pressure. After water flooding in the fourth round, the fracture permeability for CO2 was considerably reduced by around 70-85% compared with that in the second cycling test, and the influence of water flooding was much stronger at lower CO2 injection pressure. The experimental results showed that the fracture permeability for gas reduced significantly after water flooding due to formation damage. Thus, liquid CO2 is much more suitable than water as fracturing fluid for clay-abundant unconventional gas reservoirs.
| Original language | English |
|---|---|
| Title of host publication | 51st US Rock Mechanics / Geomechanics Symposium 2017 |
| Editors | Haihing Huang |
| Place of Publication | Alexandria VA USA |
| Publisher | American Rock Mechanics Association (ARMA) |
| Pages | 306-313 |
| Number of pages | 8 |
| Volume | 1 |
| ISBN (Electronic) | 9781510857582 |
| Publication status | Published - 1 Jan 2017 |
| Event | US Rock Mechanics / Geomechanics Symposium 2017 - San Francisco, United States of America Duration: 25 Jun 2017 → 28 Jun 2017 Conference number: 51st https://www.onepetro.org/conferences/ARMA/ARMA17 |
Conference
| Conference | US Rock Mechanics / Geomechanics Symposium 2017 |
|---|---|
| Country | United States of America |
| City | San Francisco |
| Period | 25/06/17 → 28/06/17 |
| Internet address |
Cite this
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Investigation of flow behavior through hydraulic fractures in unconventional gas reservoirs under tri-axial drained conditions. / Zhang, C. P.; Ranjith, P. G.; Perera, M. S. A.
51st US Rock Mechanics / Geomechanics Symposium 2017. ed. / Haihing Huang. Vol. 1 Alexandria VA USA : American Rock Mechanics Association (ARMA), 2017. p. 306-313.Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review
TY - GEN
T1 - Investigation of flow behavior through hydraulic fractures in unconventional gas reservoirs under tri-axial drained conditions
AU - Zhang, C. P.
AU - Ranjith, P. G.
AU - Perera, M. S. A.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Water-based fracking fluids are currently used to enhance the gas production from unconventional gas reservoirs, while the formation damage due to the interaction between rock matrix and residual water significantly reduce the pore space available for gas movement. In this paper, the effect of different fracturing fluids on fracture permeability is investigated using the same fractured siltstone sample in five rounds of cycling test (CO2-CO2-CO2-water-CO2). The experimental results reveal that the maximum confining pressure dominated fracture permeability. The fracture permeability for CO2 at 10MPa confining pressure decreased by around 75% after applying 40MPa confining pressure. After water flooding in the fourth round, the fracture permeability for CO2 was considerably reduced by around 70-85% compared with that in the second cycling test, and the influence of water flooding was much stronger at lower CO2 injection pressure. The experimental results showed that the fracture permeability for gas reduced significantly after water flooding due to formation damage. Thus, liquid CO2 is much more suitable than water as fracturing fluid for clay-abundant unconventional gas reservoirs.
AB - Water-based fracking fluids are currently used to enhance the gas production from unconventional gas reservoirs, while the formation damage due to the interaction between rock matrix and residual water significantly reduce the pore space available for gas movement. In this paper, the effect of different fracturing fluids on fracture permeability is investigated using the same fractured siltstone sample in five rounds of cycling test (CO2-CO2-CO2-water-CO2). The experimental results reveal that the maximum confining pressure dominated fracture permeability. The fracture permeability for CO2 at 10MPa confining pressure decreased by around 75% after applying 40MPa confining pressure. After water flooding in the fourth round, the fracture permeability for CO2 was considerably reduced by around 70-85% compared with that in the second cycling test, and the influence of water flooding was much stronger at lower CO2 injection pressure. The experimental results showed that the fracture permeability for gas reduced significantly after water flooding due to formation damage. Thus, liquid CO2 is much more suitable than water as fracturing fluid for clay-abundant unconventional gas reservoirs.
UR - http://www.scopus.com/inward/record.url?scp=85047847844&partnerID=8YFLogxK
M3 - Conference Paper
AN - SCOPUS:85047847844
VL - 1
SP - 306
EP - 313
BT - 51st US Rock Mechanics / Geomechanics Symposium 2017
A2 - Huang, Haihing
PB - American Rock Mechanics Association (ARMA)
CY - Alexandria VA USA
ER -