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Research on the Plugging Removal Technique of Low-Cost Bio-Enzyme in Ansai Oilfields

Zhang Hao,Zhang Junfeng,Wu Fengna,et al  
Ansai oilfields belong to the low permeability oil reservoir,so when the stratum is plugged,the output of oil wells will be decreased greatly.According to the mechanism of stratum plugging and the physical property of Ansai oil reservoir,the plugging removal technique of environmental bio-enzyme was evaluated in the laboratory,and then is applied to the fields,achieving the better effect of increasing oil.The practical application indicates that the plugging removal technique of environmental bio-enzyme possesses a good applicative prospect,because of needing no movement of pipes,its construction being simple,its measures having better effect,and its operation cost being low.
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