抄録
Tight oil in China features ultra-low permeability and complex pore structures, posing challenges for predicting productivity in hydraulically fractured horizontal wells. Existing models often rely on single-flow assumptions, failing to capture multi-flow-regime transitions and reservoir dynamics over the production life cycle. This study introduces a multiregional coupled seepage model dividing the flow into hydraulic fractures, stimulated reservoir volume, and far-field matrix, incorporating threshold pressure gradients and stress sensitivity, solved via Laplace transform. Validation with a well from G Oilfield shows strong agreement with actual production, capturing typical production phases. Sensitivity analysis reveals stress sensitivity dominates early production decline, while threshold pressure gradient limits long-term stability. The model aids in precise productivity evaluation, fracturing design, and production strategy for tight oil reservoirs, supporting improved economic development of unconventional resources.
