Evolution of fracture permeability with respect to fluid/rock interactions under thermohydromechanical conditions: development of experimental reactive percolation tests

Blaisonneau, Arnold; Peter-Borie, Mariane; Gentier, Sylvie

doi:10.1186/s40517-016-0045-9

Cited by 18 publications

(9 citation statements)

References 28 publications

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“…The results would provide insights for evaluation of injectivity for different CO 2 storage candidates at different depth levels. The influence of fluid type and rock-fluid interaction (both mechanical and chemical impacts) on fracture permeability for CO 2 and water should be considered too because it may alter flow pathways and consequently permeability (National Research Council, 1996;Kampman et al, 2014;Blaisonneau et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of brine-CO₂ fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

et al. 2018

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Fracture networks inside geological CO 2 storage reservoirs can serve as primary fluid flow conduit, particularly in low-permeability formations. While some experiments focused on the geophysical properties of brine-and CO 2 -saturated rocks during matrix flow, geophysical monitoring of fracture flow when CO 2 displaces brine inside the fracture seems to be overlooked.We have conducted laboratory geophysical monitoring of fluid flow in a naturally fractured tight sandstone during brine and liquid CO 2 injection. For the experiment, the low-porosity, lowpermeability naturally fractured core sample from the Triassic De Geerdalen Formation was acquired from the Longyearbyen CO 2 storage pilot at Svalbard, Norway. Stress-dependence, hysteresis and the influence of fluid-rock interactions on fracture permeability were investigated.The results suggest that in addition to stress level and pore pressure, mobility and fluid type can affect fracture permeability during loading and unloading cycles. Moreover, the fluid-rock interaction may impact volumetric strain and consequently fracture permeability through swelling and dry out during water and CO 2 injection, respectively. Acoustic velocity and electrical resistivity were measured continuously in the axial direction and three radial levels.Geophysical monitoring of fracture flow revealed that the axial P-wave velocity and axial electrical resistivity are more sensitive to saturation change than the axial S-wave, radial P-wave, and radial resistivity measurements when CO 2 was displacing brine, and the matrix flow was negligible. The marginal decreases of acoustic velocity (maximum 1.6% for axial V p ) compared to 11% increase in axial electrical resistivity suggest that in the case of dominant fracture flow within the fractured tight reservoirs, the use of electrical resistivity methods have a clear advantage compared to seismic methods to monitor CO 2 plume. The knowledge learned from

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Section: Introductionmentioning

confidence: 99%

Effect of brine-CO₂ fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

et al. 2018

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“…Deformation, therefore, can result in both the closing and opening of fractures simultaneously. Open and closing of fractures is also controlled by dissolution and precipitation (Blaisonneau et al 2016). Creep in a geothermal system, unlike creep in an open cavity, can be prevented by maintaining fluid pressure to balance stresses and strains (Warren 2006).…”

Section: Limitations and Future Workmentioning

confidence: 99%

Evaluation of NaCl and MgCl2 heat exchange fluids in a deep binary geothermal system in a sedimentary halite formation

Moore¹,

Holländer²

2021

Geotherm Energy

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Halite formations are attractive geothermal reservoirs due to their high heat conductivity, resulting in higher temperatures than other formations at similar depths. However, halite formations are highly reactive with undersaturated water. An understanding of the geochemical reactions that occur within halite-saturated formation waters can inform decision making regarding well construction, prevention of well clogging, formation dissolution, and thermal short-circuiting. Batch reaction and numerical 3-D flow and equilibrium reactive transport modeling were used to characterize the produced NaCl-brine in a well targeting a halite-saturated formation. The potential for inhibition of precipitation and dissolution using an MgCl2-brine and NaCl + MgCl2-brine were also investigated. Within the injection well, heating of an NaCl-brine from 70 to 120 °C caused the solubility of halite to decrease, resulting in the potential dissolution of 0.479 mol kg−1 halite at the formation. Conversely, cooling from 120 to 100 °C in the production well resulted in potential precipitation of 0.196 mol kg−1 halite. Concurrent precipitation of anhydrite is also expected. Introduction of MgCl2 into the heat exchange brine, which has a common Cl− ion, resulted in a decreased potential for dissolution by 0.290 mol kg−1 halite within the formation, as well as decreased precipitation within the production well, compared to the NaCl-brine. The halite solubility was altered by changes in pressure up to 0.045 mol kg−1. This indicates that designing and monitoring the composition of heat exchange fluids in highly saline environments is an important component in geothermal project design.

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“…Deformation, therefore, can result in both the closing and opening of fractures simultaneously. Open and closing of fractures is also controlled by dissolution and precipitation (Blaisonneau et al, 2016). Creep in a geothermal system, unlike creep in an open cavity, can be prevented by maintaining fluid pressure to balance stresses and strains (Warren, 2006).…”

Section: Limitations and Future Workmentioning

confidence: 99%

Evaluation of NaCl and MgCl2 heat exchange fluids in a deep binary geothermal system in a sedimentary halite formation

Moore

Holländer

2020

Preprint

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Halite formations are attractive geothermal reservoirs due to their high heat conductivity, resulting in higher temperatures than other formations at similar depths. However, halite formations are highly reactive with undersaturated water. An understanding of the geochemical reactions that occur within a halite-saturated formations can inform decision making regarding well construction, prevention of well clogging, formation dissolution, and thermal short-circuiting. Numerical 1-D and 3-D flow and equilibrium reactive transport modeling were used to characterize the produced NaCl-brine in a well targeting a halite-saturated formation. The potential for inhibition of precipitation and dissolution using an MgCl2-brine and NaCl+MgCl2-brine were also investigated. Within the injection well, with heating from 60 to 120°C, the solubility of halite decreases resulting in the potential dissolution of 0.57 mol L-1 at the formation. Cooling from 120 to 100°C in the production well results in precipitation of 0.20 mol L-1 halite as well as anhydrite, brucite, carnallite, goergeyite, gypsum, halite, kieserite and polyhalite. Introduction of Mg2+ into the heat exchange brine resulted in a decreased potential for dissolution by 0.35 mol L-1 as the heat exchange fluid entered the formation and within the formation itself, as well as decreased precipitation within the production well, compared to the NaCl-brine. The NaCl-brine solubility was altered by changes in pressure up to 0.18 mol L-1. This indicates that designing and monitoring the composition of heat exchange fluids in highly saline environments is an important component in geothermal project design.

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Evolution of fracture permeability with respect to fluid/rock interactions under thermohydromechanical conditions: development of experimental reactive percolation tests

Cited by 18 publications

References 28 publications

Effect of brine-CO₂ fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

Effect of brine-CO₂ fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

Evaluation of NaCl and MgCl2 heat exchange fluids in a deep binary geothermal system in a sedimentary halite formation

Evaluation of NaCl and MgCl2 heat exchange fluids in a deep binary geothermal system in a sedimentary halite formation

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Evolution of fracture permeability with respect to fluid/rock interactions under thermohydromechanical conditions: development of experimental reactive percolation tests

Cited by 18 publications

References 28 publications

Effect of brine-CO2 fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

Effect of brine-CO2 fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

Evaluation of NaCl and MgCl2 heat exchange fluids in a deep binary geothermal system in a sedimentary halite formation

Evaluation of NaCl and MgCl2 heat exchange fluids in a deep binary geothermal system in a sedimentary halite formation

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Effect of brine-CO₂ fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones

Effect of brine-CO₂ fracture flow on velocity and electrical resistivity of naturally fractured tight sandstones