Study of plugging mechanism for heavy oil reservoirs
Reservoir plugging restricts the efficient development of heavy oil.This study conducted lab core experiments on the impact of asphaltene,clay minerals,and oil sludge on reservoir permeability to investigate the plugging mechanisms in heavy oil reservoirs.The ex-perimental results revealed that with fluid injection,asphaltene deposition led to a decrease in permeability,but at higher temperatures,the delayed deposition of asphaltene resulted in a relatively smaller decrease in permeability.The water sensitivity of different clay minerals varied,with montmorillonite,illite,and kaolinite arranged in order from strong to weak water sensitivity.Injection of oil sludge caused a significant decline in permeability,particularly with a more pronounced decrease in permeability in high-permeability sand pack.These re-search findings provide crucial theoretical support for mitigating plugging in heavy oil reser-voirs,especially in addressing issues related to asphaltene,clay mineral,and oil sludge blockages,offering essential guidance for efficient development of heavy oil reserves.
heavy oilasphalteneclay mineralsoil sludgeplugging
万方数据
维普
