Study on carbon dioxide thermodynamic behavior for the purpose of shale rock fracturing

Niezgoda, T.; Miedzińska, Danuta; Małek, E.; Kędzierski, Piotr; Sławiński, Grzegorz

doi:10.2478/bpasts-2013-0063

Cited by 6 publications

(8 citation statements)

References 4 publications

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“…For example, the compressibility of CO2 is highly sensitive to temperature, and increasing the temperature under reservoir conditions causes the compressibility of CO2 to be highly reduced when it reaches the reservoir rock, which creates additional stress (through thermo pressure) on the reservoir rock mass, causing fractures in it. According to an analysis of the thermodynamic behaviour of CO2 by Niezgoda et al [85], the injecting CO2 pressure (7 MPa at around 20 °C atmospheric condition) can increase up to around 58 MPa when it reaches deep shale formation at around 120 °C, an eight-fold increase in CO2 pressure that is significant (see Figure 11). This thermo pressure is much higher than the tensile strength of shale rock mass (≈ 3-18 MPa) and therefore leads to the generation of fractures in the formation.…”

Section: Basic Thermodynamic Properties Of Co2mentioning

confidence: 99%

Characteristics of Clay-Abundant Shale Formations: Use of CO2 for Production Enhancement

et al. 2017

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Clay-abundant shale formations are quite common worldwide shale plays. This particular type of shale play has unique physico-chemical characteristics and therefore responds uniquely to the gas storage and production process. Clay minerals have huge surface areas due to prevailing laminated structures, and the deficiency in positive charges in the combination of tetrahedral and octahedral sheets in clay minerals produces strong cation exchange capacities (CECs), all of which factors create huge gas storage capacity in clay-abundant shale formations. However, the existence of large amounts of tiny clay particles separates the contacts between quartz particles, weakening the shale formation and enhancing its ductile properties. Furthermore, clay minerals' strong affinity for water causes clay-abundant shale formations to have large water contents and therefore reduced gas storage capacities. Clay-water interactions also create significant swelling in shale formations. All of these facts reduce the productivity of these formations. The critical influences of clay mineral-water interaction on the productivity of this particular type of shale plays indicates the inappropriateness of using traditional types of water-based fracturing fluids for production enhancement. Non-water-based fracturing fluids are therefore preferred, and CO 2 is preferable due to its many unique favourable characteristics, including its minor swelling effect, its ability to create long and narrow fractures at low breakdown pressures due to its ultralow viscosity, its contribution to the mitigation of the greenhouse gas effect, rapid clean-up and easy residual water removal capability. The aim of this paper is to obtain comprehensive knowledge of utilizing appropriate production enhancement techniques in clay-abundant shale formations based on a thorough literature review.

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Section: Basic Thermodynamic Properties Of Co2mentioning

confidence: 99%

Characteristics of Clay-Abundant Shale Formations: Use of CO2 for Production Enhancement

et al. 2017

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“…Horizontal drilling and high‐volume hydraulic fracturing are common techniques in shale gas extraction, however, the accompanying threats to the environment and human health are of concern, which is the bottleneck in the development . Recently, a notable technique that uses nonaqueous fracturing fluids of supercritical CO 2 to enhance the recovery of natural gas (CO 2 ‐EGR) has been recognized as a remarkable technique that could not only conquer the energy source exploitation problems but also achieve the capture and sequestration of CO 2 to thereby combine environmental and industrial benefits perfectly …”

Section: Introductionmentioning

confidence: 99%

“…The vast majority of the shale gas reserved in shale formations is in an adsorbed state in nanoscale pores, which includes micropores (diameter ( d )<2 nm) and mesopores ( d =2–50 nm) . Therefore, a study on the microbehavior of shale gas in nanopores with a pore size that changes from micro‐ to mesopore size is meaningful to determine the mechanisms and evaluate the potential of the recovery of shale gas.…”

Section: Introductionmentioning

confidence: 99%

Simulation to Enhance Shale Gas Recovery Using Carbon Dioxide in Silica Nanopores with Different Sizes

Sun

Zhao

et al. 2017

Energy Tech

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An understanding of molecular behavior on a microscopic level is always important not only to find out the natural principles but also to decide how to solve problems in applications. In this study, the grand canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulation methods were employed to investigate the adsorption and diffusion properties of CH4 and CO2 in silica nanopores with different sizes, and the displacement of residual CH4 in silica nanopores by CO2 at a constant temperature of 323 K and various pressures was studied. The microscopic molecular states of the adsorbed CH4 and CO2 in nanopores of various sizes are different. The competitive adsorption of CO2 over CH4 occurs broadly because of the different intensity of interactions between the gases molecules and the pore surface, of which the degree decreases with the increase of the pore size. An effective displacement process of residual adsorbed CH4 by CO2 was performed, and it is found that the displacement is enhanced with the increase of the CO2 bulk pressure and that the pore size has a significant influence on the displacement. According to the results, CO2 capture and storage (CCS) and the enhancement of CH4 recovery could be achieved at the same time in silica nanopores. This work provides microscopic information on the molecular behavior of CH4 and CO2 in silica nanopores and testifies to the efficiency of the displacement of CH4 by CO2 in silica nanopores with various sizes to provide useful guidance for applications in the enhancement of shale gas recovery by CO2.

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“…used their acoustic emission system to monitor the failure mechanisms of sandstone and granite during CO 2 injection and found that CO 2 injection promoted the nucleation and propagation of cracks in rocks, leading to sudden rock destabilization. Niezgoda et al . studied the thermodynamic behavior of carbon dioxide and confirmed its effectiveness as a medium for rock fracturing.…”

Section: Introductionmentioning

confidence: 95%

“…Li Q et al 19 used their acoustic emission system to monitor the failure mechanisms of sandstone and granite during CO 2 injection and found that CO 2 injection promoted the nucleation and propagation of cracks in rocks, leading to sudden rock destabilization. Niezgoda et al 20 studied the thermodynamic behavior of carbon dioxide and confirmed its effectiveness as a medium for rock fracturing. Taoying Liu et al 21 studied the opening and damage development characteristics of cracks subject to both compressional shear stress and porous fluids and proposed an equation for the evolution of the intensity factor of multiple rock cracks that combines the action of compression-shear stress and pore fluid pressure.…”

Section: Introductionmentioning

confidence: 97%

Effects of different fluids on microcrack propagation in sandstone under true triaxial loading conditions

Bai

2017

Greenhouse Gases

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The mechanical behavior of rock under conditions of multiphase fluids is currently a key scientific issue in the field of geotechnical engineering. In this work, we conducted triaxial compression experiments of initially water‐saturated samples, which were flooded with CO2 using the semipermeable separator method; comparatively investigated the mechanical behaviors of sandstone under the conditions of mono‐phase fluids CO2/N2/H2O and biphase fluid CO2‐H2O; and analyzed the stress‐strain characteristics, internal crack expansion, and macrocrack failure patterns of sandstones. Compared with H2O, CO2 and N2 could lead sandstone cracks to show a pattern of multiple fractures, displaying a double shear failure mode and multiple branch cracks along principal fractures. Moreover, the cracking effect of supercritical CO2 was more evident. Under the conditions of pore pressure of 10 MPa and temperature of 323 K, the ratio of work done by CO2, N2 and H2O during crack expansion was 23.5:24.1:1, with transient pressure drops to 7.82 MPa, 9.25 MPa, and 0.1 MPa, respectively. Overall, the study analyzed the mechanisms of physicochemical interactions of fluid types and the number of phases in sandstone minerals at the microscale and revealed the mechanical mechanism between fluids and rock minerals, as well as the impacts of these fluids on the strength, internal crack expansion and deformation of sandstone. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Study on carbon dioxide thermodynamic behavior for the purpose of shale rock fracturing

Abstract: Abstract. The possibility of using CO2 to fracturing a shale rock has been presented in the paper. The described innovative method which allows for the efficient extraction of shale gas and carbon dioxide storage in a shale rock was developed in

Cited by 6 publications

References 4 publications

Characteristics of Clay-Abundant Shale Formations: Use of CO2 for Production Enhancement

Characteristics of Clay-Abundant Shale Formations: Use of CO2 for Production Enhancement

Simulation to Enhance Shale Gas Recovery Using Carbon Dioxide in Silica Nanopores with Different Sizes

Effects of different fluids on microcrack propagation in sandstone under true triaxial loading conditions

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