Temperature dependence of calcite dissolution kinetics between 1 and 62°C at pH 2.7 to 8.4 in aqueous solutions

Sjöberg, Eric; Rickard, David

doi:10.1016/0016-7037(84)90276-x

Cited by 215 publications

(114 citation statements)

References 19 publications

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“…The solutions were made by adding excess sample powder to deionized water and stirring for at least 48 h at ambient laboratory conditions. It is well established in the literature that chemical equilibrium is reached within 48 h in the CaCO 3 -H 2 O-CO 2 system under such conditions [Sjöberg and Rickard, 1984;Pokrovsky and Schott, 2002;Liteanu and Spiers, 2009]. In taking such solutions to the elevated pressure and temperature conditions used in our experiments, the solutions become slightly supersaturated with calcite but re-equilibrate relatively quickly [Duan and Li, 2008].…”

Section: Samples and Pore Fluid Preparationmentioning

confidence: 70%

“…Sample temperature was reached in about 12 h. However, a total period of 15-20 h was allowed in order to establish full thermal and chemical equilibrium. This choice was based on the geochemical literature [Sjöberg and Rickard, 1984;Pokrovsky and Schott, 2002;Duan and Li, 2008], which shows that equilibration can be expected within 10-20 h under our experimental conditions (100°C-150°C), resulting in an increase in sample mass of <0.01%.…”

Section: Testing Proceduresmentioning

confidence: 99%

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Compaction creep of wet granular calcite by pressure solution at 28°C to 150°C

2010

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[1] Uniaxial compaction experiments have been carried out on wet calcite powders prepared from milled limestone, analytical grade calcite, and superpure calcite. The tests were performed at 28°C-150°C, effective stresses of 20-47 MPa, and a pore pressure of 20 MPa, using presaturated CaCO 3 solution as the pore fluid. Sample grain sizes ranged from 12 to 86 mm. The aim was to determine if creep occurs by intergranular pressure solution (IPS) under these conditions and to identify the rate-controlling process. The wet samples showed significant creep, while dry and oil-flooded samples did not. Wet samples were also characterized by microstructures such as sutured grain contacts, grain indentations, and overgrowths, suggesting the operation of IPS. The behavior of the wet samples at low strains (<4-5%) agreed well with the predictions of standard models for diffusion-controlled pressure solution. However, at higher strains (5-10%), creep slowed down compared with the model predictions. Transient flow-through tests performed in this regime led to an acceleration of creep, consistent with models for precipitation-controlled IPS, and demonstrated an increase in the impurity content of the pore fluid toward higher strains. Since some of these impurities (notably Mg 2+ ) retard precipitation in calcite, we suggest that creep occurred by diffusion-controlled IPS at low strain, giving way to precipitation control at larger strains as impurities accumulated. Fitting of the diffusion-controlled IPS model to the low strain data yielded values of the grain boundary diffusion product DS in calcite of ∼10 −19 m 3 s −1 at 150°C.

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Section: Samples and Pore Fluid Preparationmentioning

confidence: 70%

Section: Testing Proceduresmentioning

confidence: 99%

Compaction creep of wet granular calcite by pressure solution at 28°C to 150°C

2010

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“…In the third region the rate becomes independent of the pH and only depending on the CO 2 pressure. Sjoberg and Rickard (1984) studied the temperature and pH dependency of Calcite dissolution in aqueous KCl solutions. Experiments were performed with a rotating disc apparatus.…”

Section: Effect Of Ph On Calcite Dissolutionmentioning

confidence: 99%

“…The diffusion rates are assumed to be independent of the P CO2 [Berner and Morse 1974]. According to Sjoberg and Rickard (1984) the dissolution rate is proportional to the H + concentration with a power of 0.9.…”

Section: Low Ph Regimementioning

confidence: 99%

Calcite Dissolution Behaviour During Low Salinity Water Flooding in Carbonate Rock

Ouden¹,

Nasralla²,

Guo³

et al. 2015

Proceedings

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Master of ScienceCalcite dissolution behaviour during low salinity water flooding in carbonate rockby Liselotte den OudenLow salinity water flooding (LSF) has been proved to be a promising enhanced oil recovery method for sandstone reservoirs. The efficiency of LSF in carbonate reservoirs has not been proven completely yet, because there are still uncertainties about the LSF recovery mechanism in carbonate. From experimental studies, it was shown that wettability alteration, due to salinity reduction, is able to mobilize the remaining oil. Some studies attributed the wettability alteration by LSF to Calcite dissolution. Furthermore, Calcite dissolution can influence the salinity and pH of injected brines, and hence the oil recovery.However, there is a lack of experimental data on the Calcite dissolution effect of LSF in carbonate rock.The objective of this experimental study was to get a better understanding of the Calcite dissolution behaviour and how it might affect the oil recovery. Bulk and coreflood experiments have been performed; the experimental data was history matched with the use of PHREEQC. Calcite dissolution decreased with decreasing P CO2 and increased with decreasing pH and increasing NaCl salinity from 500-2000PPM.Increasing the injection rate reduced the interaction time and therefore Calcite dissolution did not reach equilibrium in coreflood at high rates. Calcite dissolution from chalk matched with the Calcite dissolution from pure Calcite, while Calcium concentration in effluent from limestone was higher. The two-phase coreflood experiment confirmed that Calcite dissolution occurs as well if oil is present in the porous media, but showed lower values than in single-phase coreflood experiment. pH increased from 5-6 to 9.5 due to Calcite dissolution, which might have an effect on the rock and oil surface charges, and hence oil recovery improvement. The effluent of the two-phase coreflood showed that an emulsion was formed, which suggested formation of in-situ surfactants. From CT scans, micro-CT scans and material mass balance calculations an increase in porosity around 1% was observed. The increase in the total dissolved species due to Calcite dissolution was not significant, which will not harm LSF effect.

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“…La dissolution ou la cimentation partielle des minéraux de remplissage à l'intérieur des plans des fractures s'avère y jouer un rôle primordial. En effet, Dyke (1995) (Sjoberg et Richard, 1984), le volume d'eau écoulé et la surface de contact de la calcite (Plummer et Wigley, 1976;Dreybrodt et al, 1996), et la température (Golubev et Garibyants, 1971;Sjoberg et Richard, 1984). Par ailleurs, la présence de certains ions, tels que les métaux, peut ralentir les réactions de dissolution de la calcite (Plummer et Wigley, 1976).…”

Section: Processus Hydrochimiquesunclassified

Étude des processus chimio-hydro-mécaniques dans un massif rocheux fracturé perturbé par une exploitation minière :

Benlahcen¹

2003

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This study on the chemical, hydraulic and mechanical processes and their coupling, was conducted at the Bouchard-Hébert Mine, located in the Abitibi Mining District in Québec, Canada. In this mine environment, the acidic water migrating from the old mine workings to the new ones, in combination with the perturbed geomechanical stress field caused by the excavations, affect the rock mass permeability. Both field work and laboratory experiments were conducted in order to investigate these processes, particularly in the rock mass portion located between the two mine workings (drift at level 6A).Results of discontinuity mapping show that at the western part of the drift at level 6A (from 10600E to 10900E), the rock mass contains two sets of fractures: one set is subhorizontal (dip between 0° and 30°) with a trace length between 1 and 1.5 m, and the other set is subvertical (dip between 75° and 90°). This subvertical set is divided into two groups depending on their trace length: one group includes fractures with a trace length between 0.5 and 2 m, and the second group comprises fractures with a trace length between 3 and 3.5 m. The fracture density of these two sets of fractures varies from 1 to 6 m" 1 and their veins are 2 mm in width. At the eastern part of the drift at level 6A (from 10900E to 11200E), the rock mass contains the same two sets of fractures observed at the western part, plus a set of fractures with a moderate dip (between 15° and 45°) with NE trend. This later set of fractures is less frequent and has a variable trace length between 0.5 and 2.5 m; their veins have a width of 2 mm. The fracture density of all the fracture set is between 1 and 4 m' 1 . Although the rock mass at the eastern part of the drift at the level 6A contains three sets of fractures, it is less permeable than the one located at the western part considering its lower fracture density. Consequently, grounwater flow would be more intense in the rock mass at the western part of the drift at the level 6 A of the mine.The results of hydraulic testing in boreholes in the rock mass located immediately under the drift 6A and over a lengh of 48 m, have shown that in the eastern part of this excavation, the hydraulic conductivity of the rock mass is low and constant, between 1 xlO" 10 and 1 xlO " n ms"1 . In the central part of this drift, located just under the old excavations, the rock mass hydraulic conductivity is higher and increases with depth from 1 xlO" 11 and 1 xlO ' 6 ms" 1 , which is in accordance with the higher fracture density in this part of the drift.Hydrogeochemical results show that waters sampled from boreholes at the mine are of neutral pH and contain high concentrations in ions, such as Ca, SO4 and metals. Calcium originates from the dissolution of calcite which is in abundance in fractures. Sulfate and metals originate from sulfide mineral oxidation present in fractures as well as in the rock matrix. Waters at a bulkhead at the base of the old excavations and the mixing waters at the surface, pumped from all ...

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Temperature dependence of calcite dissolution kinetics between 1 and 62°C at pH 2.7 to 8.4 in aqueous solutions

Cited by 215 publications

References 19 publications

Compaction creep of wet granular calcite by pressure solution at 28°C to 150°C

Compaction creep of wet granular calcite by pressure solution at 28°C to 150°C

Calcite Dissolution Behaviour During Low Salinity Water Flooding in Carbonate Rock

Étude des processus chimio-hydro-mécaniques dans un massif rocheux fracturé perturbé par une exploitation minière :

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