Numerical study on the law of fracture propagation in supercritical carbon dioxide fracturing

Application and Research Progress of CO2 Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

“…Guo et al conducted fracturing tests under different permeability conditions. They found that the length of the main crack was obviously shortened when the permeability increased from 0.001 to 0.1 mD.…”

“…The Yanchang Petroleum Company carried out a large number of fracturing operations in low-permeability reservoirs in 2017. In comparison to conventional hydraulic fracturing, they found that supercritical CO 2 fracturing can greatly increase its average production and flowback rate …”

Permeability Response Characteristics of Primary Undeformed Coal and Tectonically Deformed Coal under Loading–Unloading Conditions in Huainan Coalfield, China

“… 7 The main characteristics of low permeability and low strength resulting in the conventional reservoir stimulation methods, such as fracturing and drainage, are not suitable for the TDC reservoir. 8 Although some new CBM fracturing methods are attracting more attention, such as liquid nitrogen fracturing 9 and supercritical carbon dioxide fracturing, 10 , 11 they have not been applied in large-scale engineering.…”

Numerical Simulation of Multicrack Propagation Dynamics in Supercritical CO2 Fracturing of Tight Reservoirs

“…14−16 SC-CO 2 has good flow, penetration, and transfer properties and has advantages in reducing crack initiation pressure, connecting microcracks, forming complex fracture networks, and providing the possibility of carbon dioxide sequestration (Figure 1). 2,17,18 As a waterless fracturing method with broad prospects, SC-CO 2 fracturing is not yet clear about its complex mechanism and needs further theoretical support.…”

“…Fracturing is the most effective reservoir modification method in the process of developing low-permeability and ultralow-permeability tight oil and gas reservoirs. , Currently, the most commonly used fracturing working fluid is a water-based fracturing fluid system represented by slick water. , However, water-based fracturing fluids have problems such as high water consumption, easily cause environmental pollution, and are not suitable for water-sensitive reservoirs. − In this respect, fracturing of tight reservoirs using supercritical carbon dioxide (SC-CO 2 ) seems to give better results. , As a fracturing fluid, SC-CO 2 is not introduced into the water phase during the fracturing process, which saves water resources and does not produce water-sensitive phenomena. , SC-CO 2 has the advantages of a high diffusion coefficient and low interfacial tension, allowing SC-CO 2 to penetrate into microcracks and better connect the reservoir. − SC-CO 2 has good flow, penetration, and transfer properties and has advantages in reducing crack initiation pressure, connecting microcracks, forming complex fracture networks, and providing the possibility of carbon dioxide sequestration (Figure ). ,, As a waterless fracturing method with broad prospects, SC-CO 2 fracturing is not yet clear about its complex mechanism and needs further theoretical support.…”