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Study on SW-I Biological Solution De-plugging and Injection Gain Technology and its Application

Chen Qitao ,Liu Fu(Yangtze University Oil Engineering College,Jingzhou,Hubei,434023,China) Si Bao (PetroChina Tuhao Oilfield Company Turpan Oil Production Plant,Turpan,Xinjiang,838200,China) Zeng Fenglin (PetroChina Xinjiang Oilfield Company Shixi Oilfield Operation Area,Karamay,Xinjiang,834000, China)  
During water injection development of Lukeqin heavy oilfield,due to existence of clogging of cold damage of heavy oil,injection pressure of water injection well has been enduringly high for a long time,requirements of geological injection allocation can not be met. Proposed was the scheme of biological plugging agent injection in order to solve this problem. The reagent can quickly strip hydrocarbon from solid particle surface,degrade high molecular polymer intolowmolecular polymer and can damage polymer long- chain in mud cakes clingingon borehole wall,quickly disperse sludge,remove mud cakes and reduce the viscosity of heavy oil. Results obtained from indoor evaluation tests and field trials of four wells showthat the technique can relieve heavy cold damage in water injection wells of the block, reduce water injection pressure and improve the injection efficiency.
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