scholarly journals The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

2021 ◽  
Author(s):  
Qiao Lyu ◽  
Jingqiang Tan ◽  
Lei Li ◽  
Yiwen Ju ◽  
Andreas Busch ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Environmental Issues ◽  
Gas Shale ◽  
Horizontal Drilling ◽  
Shale Reservoirs ◽  
Supercritical Carbon

The development of hydraulic fracturing and horizontal drilling techniques has promoted the exploitation of shale gas resources. However, using water has several potential drawbacks including environmental issues, e.g., the contamination...

Thermal Effects of Liquid/Supercritical Carbon Dioxide Arising From Fluid Expansion in Fracturing

SPE Journal ◽  
2018 ◽  
Vol 23 (06) ◽  
pp. 2026-2040 ◽  
Author(s):  
Xiaojiang Li ◽  
Gensheng Li ◽  
Wei Yu ◽  
Haizhu Wang ◽  
Kamy Sepehrnoori ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Stress ◽  
Supercritical Carbon Dioxide ◽  
Hydraulic Fracturing ◽  
Thermal Effect ◽  
Fracture Propagation ◽  
Fracture Initiation ◽  
Thermodynamic Behavior ◽  
Fracture Complexity ◽  
Supercritical Carbon

Summary Liquid/supercritical carbon dioxide (L/SC-CO2) fracturing is an emerging technology for shale gas development because it can effectively overcome problems related to clay swelling and water scarcity. Recent applications show that L/SC-CO2 fracturing can induce variations in temperature. Understanding of this phenomenon is rudimentary and needs to be carefully addressed to improve the understanding of CO2 thermodynamic behavior, and thus helps to optimize CO2 fracturing in the field. In this paper, we develop a numerical model to assess the impact of thermal effect on fracture initiation during CO2 fracturing. The model couples fluid flow and heat transfer in the fracture, and is verified by a peer-reviewed solution and observation in laboratory experiments. The velocity, pressure, and temperature are calculated at various time to demonstrate the thermodynamic behavior during fracture initiation. A pseudo shock wave is observed, associated with a compression wave and an expansion wave, which finally leads to an increase in temperature in the new fracture and a decrease in temperature in the initial fracture. The thermal stress is derived to investigate the difference between hydraulic fracturing and CO2 fracturing. The results show that thermal stress, resulting from CO2 fracturing initiation, is comparable to the rock strength, which will help induce microfractures, and thus promote the fracture complexity. The formation pressure after CO2 fracturing is also calculated to evaluate the pressure-buildup potential. This work highlights the importance of CO2 expansion during and after fracturing. It is one of the unique features that differs from hydraulic fracturing. For field-design recommendations, to enhance the thermal effect of CO2 fracturing, it is a good strategy to pump CO2 at high pressure and low temperature into the reservoirs with high Young's modulus, low Poisson's ratio, low permeability, and high geothermal temperature (or large depth). This paper does not address the dynamics of fracture propagation under the influence of thermal effect. Rather, it intends to demonstrate the potential of the thermal effect of CO2 fluid in assisting the fracture propagation, and the importance of incorporating the compressibility of CO2 into fracture modeling and operation design. Failing to account for this thermal effect might underestimate the fracture complexity and stimulated reservoir volume.

Macroscale Mechanical and Microscale Structural Changes in Chinese Wufeng Shale With Supercritical Carbon Dioxide Fracturing

SPE Journal ◽  
2017 ◽  
Vol 23 (03) ◽  
pp. 691-703 ◽  
Author(s):  
Qing-You Liu ◽  
Lei Tao ◽  
Hai-Yan Zhu ◽  
Zheng-Dong Lei ◽  
Shu Jiang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Shale Gas ◽  
Structural Changes ◽  
Triaxial Tests ◽  
Upper Ordovician ◽  
Sem Images ◽  
Bedding Planes ◽  
Before And After ◽  
Supercritical Carbon

Summary Waterless fracturing for shale-gas exploitation using supercritical carbon dioxide (scCO2) is both effective and environmentally friendly, and has become an extensive research topic. Previous researchers have focused on the chemical and physical properties and microstructure of sandstone, carbonate, and shale caprock, rather than on the properties of shale-gas formations. The macroscale mechanical properties and microscale fracture characteristics of Wufeng Shale exposed to scCO2 (at greater than 31.8°C and 7.29 MPa) are still not well-understood. To study the macroscale and microscale changes of shale subjected to scCO2, we obtained Chinese Wufeng Shale crops (Upper Ordovician Formation) from Yibin, Sichuan Basin, China. The shale samples were divided into two groups. The first group was exposed to scCO2, and the second group was exposed to nitrogen (N2). Scanning-electron-microscope (SEM) and X-ray-diffraction (XRD) images were taken to study the original microstructure and mineral content of the shale. To study the macroscale mechanical changes of Wufeng Shale immersed in scCO2 or N2 for 10 hours, triaxial tests with controlled coring angles were conducted. SEM and XRD images were taken after the triaxial tests. In the SEM images, tight bedding planes and undamaged minerals (with sharp edges and smooth surfaces) were found in N2-treated samples both before and after testing, indicating that exposure to N2 did not affect the microstructures. However, the SEM images for the microstructure scCO2-treated samples before and after testing were quite different. The bedding planes were damaged, which left some connected microfractures and corrosion holes, and some mineral types were broken into small particles and left with uneven mineral surfaces. This shows that scCO2 can change rock microstructures and make some minerals (e.g., calcite) fracture more easily. The complex microscale fractures and the decrease in strength for scCO2-treated shale aid the seepage and gathering of gas, enhancing shale-gas recovery. Knowledge of the multiscale physical and chemical changes of shale exposed to scCO2 is not only essential for scCO2 fracturing, but it is also important for scCO2 jets used to break rock and for the geological storage of CO2.

scholarly journals Role of interfacial interactions on the anomalous swelling of polymer thin films in supercritical carbon dioxide

2007 ◽  
Vol 45 (11) ◽  
pp. 1313-1324 ◽  
Author(s):  
Yuan Li ◽  
Eun J. Park ◽  
Kwon T. Lim ◽  
Keith P. Johnston ◽  
Peter F. Green
Keyword(s):  
Thin Films ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polymer Thin Films ◽  
Interfacial Interactions ◽  
Supercritical Carbon

Supercritical carbon dioxide as a green media in textile dyeing: A review

2017 ◽  
Vol 88 (10) ◽  
pp. 1184-1212 ◽  
Author(s):  
Tarek Abou Elmaaty ◽  
Eman Abd El-Aziz
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
High Efficiency ◽  
Manufacturing Processes ◽  
Great Role ◽  
Textile Dyeing ◽  
Save Energy ◽  
Natural Fabrics ◽  
Supercritical Carbon

This review highlights the great role of supercritical carbon dioxide fluid technology in textile dyeing processes. The unequivocal physical characteristics of supercritical carbon dioxide are presented and further researched to continue the development of high efficiency, compact dyeing to save energy and water in manufacturing processes. This review also focuses on the solubility of the dyes in scCO2 as well as the application of the technology to both synthetic and natural fabrics. Some factors relating to the economics of sustainable scCO2 technology are also outlined.

Role of supercritical carbon dioxide for selective impregnation of decrosslinking reagent into isoprene rubber vulcanizate

Polymer ◽  
2005 ◽  
Vol 46 (7) ◽  
pp. 2016-2019 ◽  
Author(s):  
Masaaki Kojima ◽  
Shinzo Kohjiya ◽  
Yuko Ikeda
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Rubber Vulcanizate ◽  
Isoprene Rubber ◽  
Supercritical Carbon

Micromechanical analysis of hydraulic fracturing in the toughness-dominated regime: implications to supercritical carbon dioxide fracturing

2019 ◽  
Vol 24 (5) ◽  
pp. 1815-1831 ◽  
Author(s):  
Mengli Li ◽  
Fengshou Zhang ◽  
Li Zhuang ◽  
Xi Zhang ◽  
Pathegama Ranjith
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Hydraulic Fracturing ◽  
Micromechanical Analysis ◽  
Supercritical Carbon

The role of water in extraction and separation of rare earth elements in supercritical carbon dioxide

2018 ◽  
Vol 136 ◽  
pp. 180-188 ◽  
Author(s):  
L.K. Sinclair ◽  
J.W. Tester ◽  
J.F.H. Thompson ◽  
R.V. Fox
Keyword(s):  
Carbon Dioxide ◽  
Rare Earth ◽  
Supercritical Carbon Dioxide ◽  
Rare Earth Elements ◽  
Extraction And Separation ◽  
Supercritical Carbon
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