ABSTRACT
In this study, the performance of water-based fracturing fluids and supercritical CO2 in three types of representative reservoirs (sandstone, conglomerate, and shale) was investigated. The results showed that there are differences in fracture initiation pressures in different rocks, but the fracture initiation pressure of supercritical CO2 is lower than that of water regardless of the rock type. In sandstone reservoirs, supercritical CO2 induced more complex fractures than water, resulting in branching fractures. In conglomerate reservoirs, hydraulic fractures pass through the conglomerate and are flatter, whereas supercritical CO2 fractures pass through or around the conglomerate, and thus the fractures are more tortuous. Gravel stopped the fracture extension in both conditions. In shale reservoirs, supercritical CO2 can communicate natural fractures more effectively than water, thereby increasing the effective transformation volume. The study provides theoretical guidance for reservoir adaptation of supercritical CO2 fracturing.
KEYWORDS
PAPER SUBMITTED: 2023-06-05
PAPER REVISED: 2023-08-17
PAPER ACCEPTED: 2023-12-27
PUBLISHED ONLINE: 2024-02-18
THERMAL SCIENCE YEAR
2024, VOLUME
28, ISSUE
Issue 2, PAGES [1107 - 1112]
- Memon, S., et al., Supercritical CO2-Shale Interaction Induced Natural Fracture Closure: Implications for sc CO2 Hydraulic Fracturing in Shales, Fuel, 313 (2022), 2, ID122682
- Jin, Z., et al., Research Progress and Key Scientific Issues of Continental Shale Oil in China, Acta Petrolei Sinica, 42 (2021), 7, ID821
- Jin, Z., et al., Several Issues Worthy of Attention in Current Lacustrine Shale Oil Exploration and Development, Petroleum Exploration and Development, 48 (2021), 6, pp. 1471-1484
- Li, N., et al., Fracturing Technology with Carbon Dioxide: A Review, Journal of Petroleum Science and Engineering, 205 (2021), 2, ID108793
- Wang, H., et al., Research status And Prospects of Supercritical CO2 Fracturing Technology, Acta Petrolei Sinica, 41 (2020), 1, ID116
- Yang, B., et al., Fundamental Study and Utilization on Supercritical CO2 Fracturing Developing Unconventional Resources: Current Status, Challenge and Future Perspectives, Petroleum Science, 19 (2022), 2, pp. 2757-2780
- Lu, Y., et al., Research Progress and Prospect of the Integrated Supercritical CO2 Enhanced Shale Gas Recovery and Geological Sequestration, Natural Gas Industry, 6 (2021), 2, pp. 60-73
- Zheng, Y., et al., The CFD-DEM Simulation of Proppant Transport by Supercritical CO2 in a Vertical Planar Fracture, Journal of Natural Gas Science and Engineering, 84 (2020), 2, ID103647
- Zhang, C., et al., Combined Micro-Proppant And Supercritical Carbon Dioxide (SC-CO2) Fracturing in Shale Gas Reservoirs: A Review, Fuel, 305 (2021), 3, 121431
- Tian, G., et al., Experiment Investigation on the Fracture Initiation Characteristics of Shale Saturated with CO2 and Brine, Proceedings, 56th USA Rock Mechanics/Geomechanics Symposium, Santa Fe, N. Mex., USA, 2022, p. ARMA-2022-0229
- Wu, L., et al., Numerical Simulations of Supercritical Carbon Dioxide Fracturing: A Review, Journal of Rock Mechanics and Geotechnical Engineering, 15 (2023), 7, pp. 1895-1910
- Xu, W., et al., Phase-Field Method of Crack Branching during SC-CO2 Fracturing: A New Energy Release Rate Criterion Coupling Pore Pressure Gradient, Computer Methods in Applied Mechanics and Engineering, 399 (2022), 2, ID115366
- Yang, B., et al., Full-Sample X-Ray Microcomputed Tomography Analysis of Supercritical CO2 Fracturing in Tight Sandstone: Effect of Stress on Fracture Dynamics, Energy and Fuels, 35 (2021), 2, pp. 1308-1321
- Zhou, D., et al., The Effects of Temperature on Supercritical CO2 Induced Fracture: An Experimental Study, Fuel, 247 (2019), 3, pp. 126-134
- Wang, H., et al., Calculation of the Wellbore Temperature and Pressure Distribution during Supercritical CO2 Fracturing Flowback Process, International Journal of Heat and Mass Transfer, 139 (2019), 2, pp. 10-16
- Zheng, Y., et al., Experimental Investigation of Proppant Transport in Hydraulically Fractured Wells Using Supercritical CO2, Journal of Petroleum Science and Engineering, 217 (2022), 3, ID110907
- Desroches, J., et al., The Crack Tip Region in Hydraulic Fracturing, Proceedings of the Royal Society of London Series A, Mathematical and Physical Sciences, 447 (1994), 3, pp. 39-48
- Bunger, A. P., et al., Experimental Validation of the Tip Asymptotics for A Fluid-Driven Crack, Journal of Mechanics and Physics of Solids, 56 (2008), 11, pp. 3101-3115
- Zhang, J., et al.,Fracture Propagation Law and Main Controlling Factors of Conglomeratehydraulic Fracturing Based on Discrete Element Method, Petroleum Geology and Oilfield Development in Daqing 42 (2023), 3, pp. 48-57
- Sharafisafa, M., et al., Hydraulic Fracture Development in Conglomerate Reservoirs Simulated Using Combined Finite-Discrete Element Method, Engineering Fracture Mechanics, 279 (2023), 3, ID 109063
- Li, L., et al., A Numerical Investigation of the Hydraulic Fracturing Behaviour of Conglomerate in Glutenite Formation, Acta Geotechnica, 8 (2013), 2, pp. 597-618
- Shi, X., et al., Numerical Simulation of Hydraulic Fracture Propagation in Conglomerate Reservoirs, Engineering Fracture Mechanics, 248 (2021), 3, ID107738