Unconventional Gas: Experimental Study of the Influence of Subcritical Carbon Dioxide on the Mechanical Properties of Black Shale

Lyu, Qiao; Long, Xinping; Ranjith, P.G.; Kang, Yong

doi:10.3390/en9070516

Cited by 31 publications

(20 citation statements)

References 47 publications

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“…Strength may remain constant because of the precipitation of secondary carbonate minerals, which counterbalances calcite dissolution. In contrast, for black shales exposed to gaseous and scCO 2 –water mixtures for various time periods, gradual decreases in the uniaxial compressive strength, Young's modulus, and the brittleness index were observed with increasing exposure time, and the impact was greater for the scCO 2 –water case …”

Section: Alteration Of Mechanical Propertiesmentioning

confidence: 85%

“…In contrast, for black shales exposed to gaseous and scCO 2 -water mixtures for various time periods, gradual decreases in the uniaxial compressive strength, Young's modulus, and the brittleness index were observed with increasing exposure time, and the impact was greater for the scCO 2 -water case. 163,164 The fluid chemistry plays a major role in the mechanical response, as shown by Rathnaweera et al 159 They investigated the mechanical response of a quartz-rich sandstone as saturating fluids (water, CO 2 , brine, and brine-saturated CO 2 ) with varying compositions that were used to induce geochemical reactions. The nature of the saturating fluid influenced the strength, the Young's modulus, and the failure mode.…”

Section: Static Tests On Reservoir Rock In Gcs Conditionsmentioning

confidence: 99%

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A review of geochemical–mechanical impacts in geological carbon storage reservoirs

et al. 2019

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Geological carbon storage (GCS) refers to the technology of capturing man‐made carbon dioxide (CO2) emissions, typically from stationary power sources, and storing such emissions in deep underground reservoirs. GCS is an approach being explored globally as a defense mechanism against climate change projections, although it is not without its critics. An important focus has been recently placed on understanding the coupling between rock–fluid geochemical alterations and mechanical changes for CO2 storage schemes in saline aquifers. This article presents a review of the current state of knowledge regarding CO2‐induced geochemical reactions in subsurface reservoirs, and their potential impact on mechanical properties and microseismic events at CO2 storage sites. This review focuses, in particular, on the current state of the art in fluid–rock interactions within the GCS context. Key issues to be addressed include geochemical reactions and the alteration of transport and mechanical properties. Specific review topics include the swelling of clays, the prediction of dissolution and precipitation reaction rates, CO2‐induced changes in porosity and permeability, constitutive models of chemo–mechanical interactions in rock, and correlations between geochemical reactions and induced seismicity. The open questions in the field are emphasized, and new research needs are highlighted. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Alteration Of Mechanical Propertiesmentioning

confidence: 85%

Section: Static Tests On Reservoir Rock In Gcs Conditionsmentioning

confidence: 99%

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

et al. 2019

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“…In recent years, SC-CO 2 fluid, which has many advantages for improving the rates of penetration and single well recovery, has been applied in the field of drilling and completion engineering, especially for the exploitation of unconventional reservoirs [7][8][9][10]. Moreover, it is reported that a SC-CO 2 jet has better rock erosion and fracturing capacity than a water jet does, thus, it has been widely considered as a promising and novel jet technology [11][12][13][14]. Besides, inside a reservoir bed, the dissolution of organic deposition by the seepage of SC-CO 2 can increase the permeability of the reservoirs, and the absorbed natural gas can be displaced through competitive adsorption with SC-CO 2 [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Nano-Silica Additive on the Rock Erosion Characteristics of a SC-CO2 Jet under Various Operating Conditions

et al. 2017

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Abstract:In order to improve the erosion capacity of a supercritical carbon dioxide (SC-CO 2 ) jet, the influence of a nano-silica additive on the rock erosion characteristics was experimentally investigated. By impinging the SC-CO 2 jets with nano-silica mass fractions of 0 wt % (pure SC-CO 2 jet), 3 wt %, 6 wt %, 9 wt %, 12 wt %, 15 wt %, and 18 wt % on specimens of red sandstone, the erosion volumes under various operating conditions were measured and analyzed. Results show that an appropriate amount of nano-silica additive can greatly enhance the erosion ability of a SC-CO 2 jet. The effect on the erosion ability largely depends on the operating conditions. For instance, when the other conditions are fixed, 6 wt %, 9 wt %, 12 wt %, and 15 wt % were the optimum mass fractions, successively, with the inlet pressure increasing from 30 MPa to 60 MPa. With the increase in ambient pressure, the optimum mass fraction is unchanged under the constant inlet pressure, while it increases under the constant pressure drop. Additionally, the optimum mass fraction decreases when the fluid temperature increases. In addition, the optimal standoff distances are about five times the nozzle diameter of the nano-silica SC-CO 2 jet, and three times for the pure jet. This research provides a new method for effectively enhancing the rock erosion performance of a SC-CO 2 jet.

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“…Despite a growing body of research on the rock breaking of the SC-CO 2 jet, there are no descriptions of the mechanical or thermodynamic properties of the rock. The mechanical and thermodynamic properties of cement rock, sandstone, shale, and marble were investigated, [37][38][39][40][41][42][43] as shown in Table 2. It can be seen that the variation in the same kind of rock is great.…”

Section: Governing Equations Of Rock Mechanics and Rock Mechanical Anmentioning

confidence: 99%

The effect of thermal stresses on the relation between rock failure and temperature and pressure of supercritical carbon dioxide jet

Wang

et al. 2018

Greenhouse Gases

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The supercritical carbon dioxide (SC‐CO2) jet is a new‐type of rock‐breaking method that effectively combines pressure impact and thermal shock. Current studies show that a carbon dioxide jet produces a larger damaged area and requires a lower threshold pressure for rock breaking compared to a water jet; however, the rock‐breaking mechanism of the SC‐CO2 jet has not been clearly explained. This study developed a heat‐fluid‐solid coupling model using ANSYS. The simulation and experimental results show good agreement, clearly explaining the effect of thermal stress in the rock breaking of the SC‐CO2 jet. The study shows that the temperature field of the SC‐CO2 jet could result in an increase in the maximum stress and the high‐stress area. The thermal gradient between the rock surface and the internal parts decreases with jet time, further contributing to lower rock stress. When jet temperature and jet pressure differences at the entrance/exit increase, the jet temperature field contributes more to the increase in rock stress. For hard rocks with a higher elastic modulus, the thermal gradient can reduce the depth of high stress in the rock's interior and lead to greater stress on the rock surface. The study provides a basis for employing the SC‐CO2 technique in well drilling and in fracturing for shale gas exploitation. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Unconventional Gas: Experimental Study of the Influence of Subcritical Carbon Dioxide on the Mechanical Properties of Black Shale

Cited by 31 publications

References 47 publications

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

Effects of a Nano-Silica Additive on the Rock Erosion Characteristics of a SC-CO2 Jet under Various Operating Conditions

The effect of thermal stresses on the relation between rock failure and temperature and pressure of supercritical carbon dioxide jet

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