关键词: 大剂量,    ,  , 深部调驱,    ,  , 微球,    ,  , &ldquo, 双高&rdquo, 油田

Abstract: After 30 years of water flood development, G979 block of Xiaoji oilfield has entered high water cut and high recovery percent development period, and the remaining oil is highly scattered. In this situation, the basic physical and chemical properties of KN corsslinked polymer and SMG microsphere gel for high temperature reservoir were studied. The results showed that the gel synthesized by HPAM (hydrolyzed polyacrylamide) and KN crosslinking agent could be longtime stable with constant viscosity of 100 000 mPa•s at 113 ℃. And the residual resistance factor of it in core with permeability of 3.0 μm2 reached to above 20, exhibiting good plugging performance. SMG microspheres could resist 120 ℃ and their sizes increased obviously due to swelling at high temperature, which tended to plug the high permeability and would change the direction of the injected water during the followup water flooding stage, with the ultimate purpose of enhancing oil recovery. The KN corsslinked polymer and SMG microsphere gel for high temperature reservoir were optimized for the deep profile control test. Meanwhile the formation, well pattern, injected volume, plug structure were studied and optimized, combining with the adjustment of injection parameters on time. After large dose deep profile control applied in G979 block, the development effect and the water injection indexes have been significantly improved. Until June 2013, 13 wells out of corresponding 14 wells have taken effect and the increasing oil amount 9 500 t.

Key words: High dose,    ,  Deep profile control,    ,  Microsphere,     ,  High water cut and high recovery percent reservoir