克拉玛依油田注水井解堵增注技术研究

随着开采时间的延长，注水开发油田地下矛盾进一步突出，产水量不断上升，产量逐年递减。克拉玛依油田 自投入开发以来实施污水回注，由于回注污水水质不达标等因素，造成地层堵塞严重，注入压力高，注入量少。通过分 析注水井动态资料和堵塞物情况，剖析了注水井的堵塞机理，针对不同堵塞机理，研制了相应的解堵剂，并对解堵液溶 蚀岩样、降解聚合物、清除FeS 垢进行了室内评价实验。结果表明，该解堵液溶蚀能力强，可大幅降低聚合物溶液的黏 度、可氧化分解聚合物凝胶，能有效清除FeS 垢。对水敏性储层砂岩酸化所存在的问题，采用FP 1 防膨剂酸化增注 工艺。现场实施后，措施效果显著，这对于其他油田类似现象有一定的借鉴意义。

The Research for Relieving Damage and Stimulation of Injection Well in Karamay Oilfield

Along with the waterflooding development，the subsurface contradiction is becoming obvious，that is，the increase of water production brings about decline of production. Karamay Oilfield has been carrying out waste-water reinjection since the beginning of the development，which cause formation plugging for inferior quality，resulting in high injection pressure and low injection rate. Based on the analysis of performance data and stemming，the plugging mechanism is studied and plug remover is developed. The experiments of dissolved rock sample，degraded polymer and the removed iron sulfide scale indicate that the plug remover have great dissolving capability，which can reduce the viscosity of polymer solution，oxidize and decompose polymer gel，and remove iron sulfide scale. The FP 1 anti-swelling agent is adopted in the acidizing technology for watersensitive sandstone reservoirs. The effectiveness of field application is remarkable，which is of certain model significance to other similar oilfields.