Key Issues in the Application of Supercritical Carbon Dioxide Fracturing in Unconventional Gas Well

[摘要] Supercritical carbon dioxide is a promising approach to enhance oil recovery in a greener way compared to conventional fracturing technology. SC-CO 2 fracturing has advantages of the complicated fracture network, low formation pollution, and methane replacement on account of its good performance of permeability, anhydrous fracturing fluid, less chemical additives, and solubility. Technical features and research state of SC-CO 2 fracturing were discussed in this paper. Key issues in the application of SC-CO 2 fracturing was summarized in the following aspects: Flow laws of SC-CO 2 in the wellbore and fracture need to be lucubrated to provide a basis for fracturing design; Interactions between formation rock and SC-CO 2 need to be studied to find the Fracture propagation laws; The proppant-carrying laws need to be explained clearly to form better support effect of the fracture; Effective CO 2 tackifier and ultra-light proppant need to be found to improve the proppant-carrying capacity; SC-CO 2 source and fracturing devices should be further considered to reduce the cost, increase the efficiency ensure production safety of SC-CO 2 fracturing.

[学科分类] 材料科学（综合）