注聚合物后转后续水驱油田整体调剖研究

针对孤岛油田中一区Ng3层段注聚合物后转后续水驱时对应油井聚合物产出浓度高的问题 ,开发出一套相应的调剖治理技术。综合考虑注聚合物井的渗透率、吸水剖面、注入动态、井口压降曲线及对应油井的聚合物产出浓度等因素 ,利用模糊综合评判原理优选出最佳的调剖井 ,并根据注入动态优化了堵剂类型和堵剂用量。在矿场实施后 ,处理井的视吸水指数下降 ,剖面得到改善 ,对应的油井聚合物浓度降低 ,日产油量增加。 11口调剖井对应的 49口油井中 ,见效 35口 ,受效率达 71 4%。说明这套调剖技术能有效地改善注聚合物后转后续水驱油田的开发效果。

PROFILE CONTROL FOR WATER FLOODING BLOCK AFTER POLYMER INJECTION

A comprehensive technology of profile control is presented. It has been used to solve the problem about high concentration of produced polymer in Zhong 1 block with water flooding method after polymer injection. The optimum candidate wells are selected by the fuzzy theory based on some factors, including permeability distribution, injection profile, injection performance, pressure pull off curve and the produced polymer concentration in correspondence with oil wells. The type and volume of profile control agent are designed according to the injection behaviors. After profile control of injection wells, the apparent water injectivity indices of the treated wells are declined, and the injection profiles are improved. The produced polymer concentration in correspondence with oil wells decreases, and the oil production rate increases. The oil production of 35 wells among 49 corresponding to oil wells increases. The development result of this block is improved.