胡俊卿
HU Junqing

• 1:中国石油大庆油田有限责任公司第一采油厂

摘要(Abstract)：

化学驱的规模应用，不断刷新着大庆油田采收率极限，成为油田持续有效开发的重要技术，但随着化学驱注剂量增加，地层近井地带堵塞严重，部分井欠注现象日益突出，影响区块开发效果。针对洗井吐液中大量的胶团导致近井地带堵塞的问题，利用仪器检测和物理化学分析等手段对化学驱返吐的堵塞物进行分析，明确堵塞物成分并揭示堵塞机理。结果表明：聚合物胶团主要成分是有机物，夹杂金属离子和垢质，呈高黏无弹性、胶联状排列的致密结构；Fe~(3+)和Al~(3+)是导致聚合物形成胶团的主要原因，污水中的细菌发生氧化还原反应腐蚀管线产生Fe~(3+)，生成胶团临界质量浓度为1.5 mg/L；碱溶蚀地层产生Al~(3+)，生成胶团临界质量浓度为1.375 mg/L；针对堵塞物成分开展解堵剂优化研究，形成了采油1-1型和采油1-2型2种解堵剂，现场实施10口井，平均单井注入压力下降了1.4 MPa，平均单井日增注量为23 m~3，累计增注量为973 m~3。研究成果可有效指导化学驱欠注井治理，对化学驱提质增效具有重要意义。
Large-scale application of chemical flooding has continuously broken recovery limit of Daqing Oilfield and become an important technology for sustainable effective development of the oilfield.However,the increase of chemical injection volume causes serious blockage of near-well formation and increasingly under-injection phenomenon of some wells,affecting development effect of the block.In view of the problem that a large number of micelles appear in backwash fluid,which leads to blockage in near-wellbore zone,instrument detection and physical and chemical analysis are performed to analyze the blockage of chemical flooding backwash,determine blockage composition and reveal blocking mechanism.The results shows that the main component of polymer micelles is organic matter,which is mixed with metal ions and scale,and has dense structure of high viscosity,inelastic and gelatinous arrangement.Fe~(3+)ions and Al~(3+)ions are main causes for polymer forming micelles.The bacteria in produced water corrode the pipeline by oxidation-reduction reaction to produce Fe~(3+)ions,and critical concentration of micelles is1.5 mg/L.Al~(3+)ions are generated from alkaline solution formation,and critical concentration of generated micelles is1.375 mg/L.According to the composition of blockage material,blockage removal agent is optimized,and 2 kinds of agent including Oil Production 1-1 type and Oil Production 1-2 type are formed.10 wells are implemented on site,with average injection pressure of single well decreased by 1.4 MPa,average daily injection of single well increased by 23 m~3,and cumulative injection increased by 973 m~3.The research can guide the treatment of under-injection wells in chemical flooding,and have significance for improving the quality and efficiency of chemical flooding.

关键词(KeyWords)： 化学驱;近井地带堵塞;胶团;形成机理;解堵方法;萨中
chemical flooding;near wellbore blockage;micelle;formation mechanism;blockage removal method;Sazhong area

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“三次采油提高采收率关键技术”（2021DJ16）

作者(Author): 胡俊卿
HU Junqing

DOI: 10.19597/j.issn.1000-3754.202210062

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