Effect of salinity on the kinetics of pyrite dissolution in oxygenated fluids at 60 °C and implications for hydraulic fracturing

Vandeginste, Veerle; Siska, Andris; Belshaw, Grace; Kilpatrick, Andrew D.

doi:10.1016/j.jngse.2020.103722

Cited by 3 publications

(2 citation statements)

References 64 publications

(148 reference statements)

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“…Previous studies confirmed that pyrite oxidation easily occurred in the environment of the atmosphere or water-containing oxygen. 22 , 40 − 42 The dissolved oxygen and the oxidative gel breakers in the fracturing fluid could have substantial effects on pyrite dissolution. The reactions of pyrite oxidation are represented as follows Based on the results of FE-SEM, XRD, and solution pH, pyrite oxidation occurred in the PR shale during the experiment.…”

Section: Resultsmentioning

confidence: 99%

“…Xu observed that the dissolved oxygen in fracturing fluid can cause the pyrite oxidation and dissolution in shale through water imbibition experiments under oxic and degassed conditions . The oxidation of pyrite has been considered one of the key factors that influence the shale pore structure. ,, Jew found that the Fe(II)-bearing phases could change to Fe(III)-bearing precipitates when the pH of fracturing fluid was above 3.25 in the carbonate-poor shale . However, You reported that the oxidation of pyrite could produce dissolution pores and cracks, and the oxidation sensitivity was controlled by the pyrite content, dissolved oxygen content, and reservoir conditions .…”

Section: Introductionmentioning

confidence: 99%

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Impact of Pyrite Oxidation on the Pore-Structure Characteristics of Shale Reservoir Rocks under the Interaction of Fracturing Fluid

Sun

et al. 2022

ACS Omega

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Hydraulic fracturing combined with horizontal drilling is widely used to develop shale gas resources, and huge amounts of fracturing fluid are injected into shale reservoirs. However, the fracturing fluid is ineluctably retained in reservoir rocks after fracturing, resulting in the alteration of shale pore systems and further affecting the hydrocarbons production efficiency. In this work, two types of shales with different pyrite contents, namely, pyrite rich (PR, Niutitang Formation) and pyrite poor (PP, Xiamaling Formation), were emphasized to illustrate the effect of pyrite oxidation on pore structure after fracturing operation. Slickwater fracturing fluid was used to treat the shale samples for a period of 3 days, under the condition of 100 °C and 50 MPa. The field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) were utilized to determine the surface morphology and mineral composition. The low-temperature N 2 adsorption was performed to quantify the pore structure. The results showed that the pyrite oxidation induced the dissolution of both the pyrite and calcite and generated many dissolution pores for the pyrite-rich shale after slickwater treatment. The mineral dissolution led to an increase in the number of mesopores, enlarged the total specific surface area (TSSA) and total pore volume (TPV), and strengthened the pore-structure complexity. On the other hand, the pyrite-poor shale only experienced clay swelling after slickwater treatment. Its pore surface roughness and pore-structure complexity degraded with the loss of nanopores and the reductions in TSSA and TPV. The results of this study enhance the understanding of the impact of pyrite oxidation on the pore structure and provide new insight into the optimization of fracturing operation conditions based on shale’s mineral composition characteristics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Pyrite Oxidation on the Pore-Structure Characteristics of Shale Reservoir Rocks under the Interaction of Fracturing Fluid

Sun

et al. 2022

ACS Omega

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Fluid‐rock interaction experiments with andesite at 100°C for potential carbon storage in geothermal reservoirs

Belshaw,

Steer,

et al. 2024

Deep Underground Science and Engineering

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Geothermal energy extraction often results in the release of naturally occurring carbon dioxide (CO2) as a byproduct. Research on carbon storage using volcanic rock types other than basalt under both acidic and elevated temperature conditions has been limited so far. Our study uses batch reactor experiments at 100°C to investigate the dissolution of andesite rock samples obtained from an active geothermal reservoir in Sumatra (Indonesia). The samples are subjected to reactions with neutral‐pH fluids and acidic fluids, mimicking the geochemical responses upon reinjection of geothermal fluids, either without or with dissolved acidic gases, respectively. Chemical elemental analysis reveals the release of Ca2+ ions into the fluids through the dissolution of feldspar. The overall dissolution rate of the rock samples is 2.4 × 10–11 mol/(m2 · s) to 4.2 × 10–11 mol/(m2 · s), based on the Si release during the initial 7 h of the experiment. The dissolution rates are about two orders of magnitude lower than those reported for basaltic rocks under similar reaction conditions. This study offers valuable insights into the potential utilization of andesite reservoirs for effective CO2 storage via mineralization.

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Kinetic Investigation of Initial Oxidative Dissolution of Pyrite in Alkaline Media (pH 9–12) and Influence of Ca and Mg: A Fundamental Study for Pyrite Depression in Froth Flotation

Fuchida

Xue

Ishida

et al. 2022

J. Sustain. Metall.

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Effect of salinity on the kinetics of pyrite dissolution in oxygenated fluids at 60 °C and implications for hydraulic fracturing

Cited by 3 publications

References 64 publications

Impact of Pyrite Oxidation on the Pore-Structure Characteristics of Shale Reservoir Rocks under the Interaction of Fracturing Fluid

Impact of Pyrite Oxidation on the Pore-Structure Characteristics of Shale Reservoir Rocks under the Interaction of Fracturing Fluid

Fluid‐rock interaction experiments with andesite at 100°C for potential carbon storage in geothermal reservoirs

Kinetic Investigation of Initial Oxidative Dissolution of Pyrite in Alkaline Media (pH 9–12) and Influence of Ca and Mg: A Fundamental Study for Pyrite Depression in Froth Flotation

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