埕岛油田疏松砂岩储层敏感性研究

SENSITIVITY RESEARCH OF RESERVOIR ON UNCONSOLIDATED FORMATION IN CHENGDAO OIL FIELD

埕岛油田CB4A、CB4B、CB4C井组属埕岛四井区SH4开发井组 ,其胶结物含量明显低于埕岛油田其它区块 ,储层胶结疏松 ,作业过程中容易导致油层伤害。通过对埕岛油田馆陶组储层进行的大量敏感性实验研究 ,认为馆陶组储层Ng3段属于弱流速敏感、中等强度的水敏、盐敏 ,对土酸不敏感。临界矿化度为 2 0 0 0～ 4 0 0 0mg/L 。

CB4A,CB4B and CB4C are the well sets belong to SH4 development well area in Chengdao oilfield.Their formations contain gum substance lower than other area in Chengdao oil field,Due to the formation with poor consolidation,it's easy to be damaged during the operation.According to the sensitivity experiment on Guantao formation in Chengdao oilfield,it shows that Ng3 member in Guantao is weak velocity of flow sensitivity,middle water and salt sensitivity,and no sensitivity to mud acid.The critical salinity is 2000～4000mg/1.All this provide technique basis for optimizing the completion fluid system effectively.