Reservoir sensitivity analysis of the third member of Liushagang formation in X oilfield of Wushi sag
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摘要: 乌石凹陷X油田流沙港组三段储层复杂,敏感性强。综合利用岩石薄片鉴定、黏土矿物X衍射、扫描电镜、高压压汞等多种分析手段针对性地开展储层敏感性试验,分析储层敏感性规律以及敏感性伤害机理。实验结果表明,砂砾岩储层水敏性极强,细砂岩储层水敏性中等偏强;砂砾岩储层在单相盐水中速敏性中等,临界流速为0.965 m/d,在单相中性油中速敏性弱,无临界流速,细砂岩储层无速敏性;储层整体酸敏性中等偏弱、碱敏性弱。黏土矿物和胶结物含量、类型、产状以及岩石孔隙结构是引起储层较强敏感性的重要因素;建议在钻完井工作中做好工作液与地层流体之间的配伍,同时在地层条件下控制注采流速,避免储层损害。Abstract: The reservoirs from the third member of Liushagang formation in the X oilfield of Wushi sag is complex and sensitive. In this study, a variety of analytical methods, such as thin section identification of rock, X-ray diffraction of clay minerals, scanning electron microscopy, high-pressure mercury injection, are used to carry out the reservoir sensitivity test, so as to analyze the reservoir sensitivity regularity and sensitivity damage mechanism, and provide a basis for efficient development of the oilfield. The experimental results show that the water sensitivity of Glutenite reservoir is very strong, and the water sensitivity of fine sandstone reservoir is medium to strong; the velocity sensitivity of Glutenite reservoir in single-phase brine is medium, the critical velocity is 0.965 m/d, the velocity sensitivity is weak in single-phase neutral oil, there is no critical velocity, and the fine sandstone reservoir has no speed sensitivity; the overall acid sensitivity of the reservoir is medium to weak, and the alkali sensitivity is weak. The content, type, occurrence and pore structure of clay minerals and cements are important factors that cause strong sensitivity of reservoir. It is suggested that the compatibility between working fluid and formation fluid should be done well in drilling and completion, and the injection production flow rate should be controlled under formation conditions to avoid reservoir damage.
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Key words:
- Wushi sag /
- Liushagang formation /
- sensitivity evaluation /
- damage degree /
- clay mineral
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