Abstract
To address the critical challenges of rapid production decline and low recovery efficiency in the development of shale oil reservoirs in the Chang 7 Member of the Ordos Basin, this study proposes an optimization method for single-well huff and puff development that integrates imbibition and stress sensitivity. A multi-scale coupled numerical simulation framework based on the Embedded Discrete Fracture Model was established to systematically analyze the influence of key parameters—including injection timing, injection rate, shut-in duration, and huff and puff cycle—on production performance. The model fully incorporates the imbibition-driven mechanism within complex fracture networks of shale reservoirs and the dynamic regulation of seepage behavior due to stress sensitivity, enabling high-precision prediction and optimization of the injection process. Results demonstrate that rational parameter design can not only effectively replenish reservoir energy but also enhance oil recovery, with oil recovery improving by 5.1% and the oil-water displacement efficiency reaching 6.8% under optimal conditions. The innovation of this study lies in incorporating the coupled imbibition–stress sensitivity mechanism into the optimization of shale oil injection development parameters, significantly improving model adaptability and predictive accuracy, and providing valuable engineering insights for single-well huff and puff development in continental shale oil reservoirs.
