scholarly journals Rapid porosity and permeability changes of calcareous sandstone due to CO2-enriched brine injection

2014 ◽  
Vol 41 (2) ◽  
pp. 399-406 ◽  
Author(s):  
Benoit Lamy-Chappuis ◽  
Doug Angus ◽  
Quentin Fisher ◽  
Carlos Grattoni ◽  
Bruce W. D. Yardley
Keyword(s):  
Permeability Changes ◽  
Porosity And Permeability ◽  
Brine Injection

Evaluation of Permeability Changes in a Carbonate Rock under Carbonate Water Flow

2016 ◽  
Vol 830 ◽  
pp. 65-70
Author(s):  
Eric Yuji Yasuda ◽  
Erika Tomie Koroishi ◽  
Osvair Vidal Trevisan ◽  
Euclides José Bonet
Keyword(s):  
Injection Rate ◽  
Absolute Permeability ◽  
Carbonate Water ◽  
Permeability Changes ◽  
Mean Pressure ◽  
Porosity And Permeability ◽  
The Mean ◽  
Temperature And Pressure ◽  
Brine Injection ◽  
Permeability Alterations

Carbon dioxide (CO2) injection in reservoirs promotes reactions which depend on rock nature, brine composition, partial pressure of CO2, reservoir temperature and pressure among other conditions. The reactions may cause changes in the petrophysics properties, including porosity and permeability, that are important parameters to the fluid flow. The present study focus on the effects of carbonated brine injection in carbonate rocks similar to pre salt reservoirs. The effects are evaluated through the changes of the rock absolute permeability provoked by the acidic action of the injected fluid. Experiments were designed to detail permeability changes along the length of a long carbonate core using using a coreholder equipped with multiple pressure taps. The experiments were conducted in dynamic regime, at the temperature of 22°C and at the mean pressure of 2,000 psi, at flow rates of 0.5; 1 and 2 cc/min. The results show significant permeability alterations at the different segments of the sample, which are also highly dependent on the injection rate.

scholarly journals Permeability Changes Resulting from Quartz Precipitation and Dissolution around Upper Crustal Intrusions

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Samuel W. Scott ◽  
Thomas Driesner
Keyword(s):  
Host Rock ◽  
Permeability Reduction ◽  
Rock Permeability ◽  
Permeability Changes ◽  
Order Of Magnitude ◽  
Porosity And Permeability ◽  
Fluid Convection ◽  
Flow Heat ◽  
Primary Porosity ◽  
Host Rocks

It has long been recognized that quartz precipitation from circulating hydrothermal fluids may reduce porosity and permeability near intrusions. However, the magnitude of permeability changes and potential feedbacks between flow, heat transfer, and quartz precipitation/dissolution remain largely unquantified. Here, we present numerical simulations of fluid convection around upper crustal intrusions which explicitly incorporate the feedback between quartz solubility and rock permeability. As groundwater is heated to ~350°C, silica dissolves from the host rock, increasing porosity and permeability. Further heating to supercritical conditions leads to intensive quartz precipitation and consequent permeability reduction. The initial host rock permeability and porosity are found to be main controls on the magnitude and timescales of permeability changes. While the permeability changes induced by quartz precipitation are moderate in host rocks with a primary porosity ≥ 0.05, quartz precipitation may reduce rock permeability by more than an order of magnitude in host rocks with a primary porosity of 0.025. Zones of quartz precipitation transiently change locations as the intrusion cools, thereby limiting the clogging effect, except for host rocks with low initial porosity. This permeability reduction occurs in timescales of hundreds of years in host rocks with initial high permeability and thousands of years in host rocks with intermediate permeability.

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