Injection Wells Profile Control Technology Research In Yudong Area Of Lu Keqin Oilfield

In this paper,According to the injection difficulties faced by the Yu Dong block of Tuha Lukeqin Oilfield in recent developing years,and analyzing the status and problems about deep profile control technology over the years,think that the existing technology can not meet the needs of reservoir geology of Yu Dong block.the further study of the deep profile control technology is urgent,and to solve the problems in the Yu Dong block.Based on profile control technology research about the Injection wells in the country,carried out a study about the formulation of deep profile control agent system indoor,developed ionomer gel profile control agent and slow expansion of flexible viscoelastic particle profile control agent that are suitable for Yu Dong Block,and its performance was evaluated.Laboratory evaluation results show that:the ionomer gel profile control agent has a good selection of plugging,high plugging rate,controllable gelling strength,good resistance of temperature and salt and thermal stability.low expansion of flexible viscoelastic particle profile control agent has a particle profile slow expansion,temperature tolerance,good viscoelastic,good water retention and good water recovery.On the basic of Indoors research about profile agent system,combining the two agent,and carrying out profile process design for Yu Dong Block.And in blocks select Yudong204-36 well group to launched a deep profile pilot test,and to conduct on-site pilot test profile:after measures Yu Dong 204-36 injection wells started pressure rises from 0MPa to16.1MPa,Water injectivity index fell from the previous 34.24m3/Mpa.d to11.84m3/Mpa.d.water absorption index fell 65.42 percent compared with that before the measures,the well group corresponding wells,Increasing oil production reached 2000 tons;Pilot test results show that:the complex ion crosslinked gel profile control agent and slow expansion of flexible viscoelastic particle profile control agent meet the needs of Yudong block reservoir profile,there is a good effect of rainfall and increasing oil.