稠油油藏压裂增产新模型及裂缝导流能力研究

基于考虑迂曲度的幂律流体流变特性方程，推导出了稠油储层污染前后直井的产能预测模型，以及污染井压裂前后的产能预测模型和相应的采液指数比，提出了稠油油藏压裂裂缝导流能力的新模型，分析了非牛顿流体流变特性参数对模型的影响。结果对比表明：幂率指数越小，非牛顿性越强，流动越困难，其产能比越小，导流能力也越小；迂曲度对于油井产能也有一定的影响，迂曲度越大，产能越小；流体的性质对压裂前后的产能有很大的影响，非牛顿性越强，产能越小，压裂后增产的倍数越小。

A New Fracturing Stimulation Model for Heavy Oil Reservoir and the Fracture Conductivity Studies

Based on the rheological equations for power-law fluid, productivity prediction models of vertical wells were developed for heavy oil reservoir before and after contamination. The contaminated wells productivity prediction models before and after fracturing were derived and the associated liquid production index ratios. A new model for fracture conductivity in heavy oil reservoirs were proposed and the impacts of the non-Newtonion theology on the model were analyzed. The comparisons indicate that, as the power-law index gets smaller, the non- Newtonion flow becomes harder, the flow becomes more difficult and the productivity and conductivity becomes smaller. The detour index has certain impacts on the well productivity. The higher the detour index, the smaller the periodicity is. Fluid properties have larger impacts on the productivity before and after fracturing. The more the non-Newtonion flow, the smaller the productivity is and the stimulation effectiveness is smaller after fracturing.