Advancements in Supercritical CO2 Fracturing Physical Simulation Experiments
Supercritical CO2(SC-CO2)fracturing technology represents a highly promising emerging technique for enhancing production in unconventional oil and gas reservoirs.This technology not only effectively avoids issues such as formation damage,environmental pollution,and water resource depletion caused by traditional hydraulic fracturing but also offers advantages such as lower initiation pressure and complexity in fracture propagation.SC-CO2 fraturing experiment in an important technical means for conducting research on SC-CO2 fraturing technol-ogy,understanding and sumarizing the mechanism production increase.Therefore,this review discusses advance-ments in SC-CO2 fracturing experiments aimed at guiding the development of SC-CO2 fracturing technology.First-ly,the composition and functionalities of the laboratory-scale SC-CO2 fracturing experimental system are intro-duced,along with suggestions for addressing existing shortcomings in the experimental setup.Secondly,an analysis of research findings from SC-CO2 fracturing experiments is presented.It is observed that SC-CO2 exhibits lower in-itiation pressure compared to hydraulic fracturing due to its enhanced permeability.Additionally,SC-CO2 has the capability to interact with the internal microcracks and micropores of rocks,promoting the formation of complex fracture networks.Lastly,insights gained from experimental studies on the transport of SC-CO2 with proppants within fractures are summarized.The result indicates that the transport behavior of SC-CO2 with proppants is simi-lar to that of water-based fracturing fluids,albeit less effective.At present,it is necessary to strengthen laboratory experimental studies on the transport of SC-CO2 with proppants to further optimize process parameters for SC-CO2 fracturing.
fracturing technologysupercritical CO2 fracturingfracture growthproppant transport
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