Field Application Of Nitrogen Foam Flooding In Tuo 33 Of Liaohe Oilfield

The development trend of petroleum exploitation in the world is that the formation structure is simple,the large crude oil distribution,large storage,high production will enter the middle and late stage,and the complicated formation structure,low permeability oilfield is difficult and slow,and finally leads to the increasing proportion in oilfield development.At present,in the process of water injection,because of the heterogeneity of the reservoir,the injection water and and bottom water are not evenly pushed along the high pervious bed,and form the tongue into the horizontal,causing the early breakthrough of water injection,and even flooding,so that the low permeability can not play a role and reduce oil recovery.In order to make the remaining oil reserves in the difficult oilfield can be more effective development,to achieve oilfield production,reduce cost,improve development effectiveness,it is necessary to improve the sweep efficiency of injection fluid and improve the degree of remaining oil.And the nitrogen foam flooding technology is a new technology to improve the sweep volume,increase the wash oil efficiency,and to improve oil recovery.It is based on the inject profile of the reservoir to adjust the water absorption profile,and then inject the subsequent slug to start residual oil,reaching the dual role of " modulation" and " drive ".The improvement of suction profile can increase the sweep volume of subsequent segments,and subsequent slug can significantly reduce the residual oil saturation and improve oil displacement efficiency.Finally,the purpose of enhancing oil recovery.In this paper,the occurrence of some oil-water wells in the Soaring oilfield in Liaohe oilfield,increased water cut,lower production speed,low cumulative injection-production,continuous decrease of formation energy,water injection pressure close to fracture extension pressure,and more difficult to improve water injection capacity.In order to solve the above problems,the tuo nitrogen foam qukuangchang test was conducted in January 2016.