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Preparation for strong gels plugging agent of modified starch

LI Fen-li1,HOU Ji-rui1,LIU Ying-hui2,LU Xin1 (1.EOR Research Center of China University of Petroleum,Beijing 102249,China;2.Ocean Engineering Project Department of Jidong Oilfield,Tanghai 063200,China)  
Appling advantageous property of modified starch,the strong gels water plugging and profile modification agent for medium-low temperature reservoirs is developed.Effect of every compositional concentration on gelation time and gel intensity is studied,and effect of pH value,temperature and water quality on property of water plugging agent is also investigated.With simulation method of sand filling tubes,effect of water plugging agent is determined.Result shows that,this agent has high intensity and resistant to salinity and erosion,gelation time can be regulated,and it is suitable for depth profile modification of medium-low temperature reservoirs.This agent has low operation cost,and has been widely used in Jilin Oilfield with an excellent performance.
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