Depth Profile Control Technique Research And Application In Daqing Oilfield

After 50 years' development Daqing oilfield has entered specially high water cut stage.The formation structure of unconsolidated sandstone reservoirs has changed distinctly after the long-term high speed water-flooding, The effects of injected water to pore structure, High permeability or terribly high permeability zones are come into being in reservoir, namely water channel.In reservoirs exists water channels, injected water cyclically produced inefficiently along water channels, meanwhile the pore volume swept by water driving is reduced, and the improvement of oil recovery and development benefit is seriously affected.We must block the water channel or high permeability sandstone formation for enhancing oil recovery,Deep profile control is the best one of the methods for enhancing oil recovery of water flooding and Reduceing water cut.In this paper, Actuality of profile control technology all around the world, theory of profile control technology .We have established a set of reasonable method to select well or layer for profile control of DaQing oil field. And established a set of evaluation methods for in-depth profile control agents used in oilfield. Pre-gelled swellable particle profile control agent and Compound-ion profile have been used wildly in the DaQing oilfield extensively,and good results have been achieved.In order to ensure the performance stability and profile control agent quality,the pre-gelled swellable particle profile control agent has been tested and evaluated in the lab and the performance evaluation of pre-gelled swellable particle profile control agent are established.But Compound-ion profile also keeps a quite great part of problems within the lab reservoir,We knows little of flow laws in porous medium.In addition, this effect of Compound-ion profile flooding relate to bring gel .so it is important research and evaluation of compound-ion profile agent in porous rock. In order to improve the development effect of oilfield, This paper studies the influencing factors of performance of profile agent,and first research by physical stimution technology,with long physical simulation filled sand. and compared the results with conventional experimental results .The experiment provided a new method in physical stimution evaluation,the experimental results will have important significance on improve Compound-ion Profile Agent or evaluation other profile agent.The last, Profile control technology is studied thoroughly and instance apply is actualized in SaZhong and SaBei and good results have been achieved.