Abstract
Addressing the development bottlenecks caused by the strong heterogeneity of the Permian Lucaogou Formation mixed tight oil reservoirs in the Santanghu Basin, it is of significant strategic importance to research key fracturing technologies to enhance the development efficiency of unconventional oil and gas resources. This study aims to overcome the challenges of effective fracture network control under complex mixed lithological conditions and resolve technical issues such as high treatment pressure and rapid production decline. Based on the “geology-engineering integration” philosophy, a characterization model covering seven key properties was constructed through a comprehensive analysis of lithology, physical properties, oil-bearing capacity, and geomechanical parameters. A technical pressure-controlled drainage and production scheme was developed, integrating pre-pad acid-assisted pressure reduction, sand-plug rounding processes, and large-displacement volume fracturing, followed by field pilot tests. The results demonstrate that this technical system effectively reduces breakdown pressure, significantly activates natural fracture networks, and creates a large-scale stimulated reservoir volume. Simultaneously, stable long-term production is achieved by leveraging the spontaneous imbibition mechanism. The research indicates that the proposed integrated volume fracturing technology for mixed tight oil horizontal wells not only remarkably improves the recovery efficiency of complex regional reserves but also provides theoretical support and an engineering demonstration for the efficient development of similar continental mixed unconventional resources, offering extensive potential for widespread application.
