Analysis On The Influence Of Formation Pressure Level On Yield Of Low Permeability Reservoir And Its Factor Analysis

With the further development of exploration and development,conventional reservoirs are gradually developed,and low-permeability and ultra-low permeability reservoirs become the main successor.Such reservoirs,both in terms of size and reserves,are larger than conventional reservoirs and have become the main direction of China's oil industry.The permeability of the low permeability reservoir is dense,the pore and the radius of the aperture are fine,the specific surface area of the rock is large,the resistance of the fluid in the internal flow is large,fluid flow velocity and stratigraphic pressure conduction is slow.Therefore,the seepage mechanism is also different from the conventional reservoir,the fluid flow does not meet the Darcy principle,there is a starting pressure gradient.As the reservoir hole roar is small,the formation fluid pressure decreases caused by local stress concentration,compression pore and roar radius,the porosity permeability decreased,affecting oil production capacity and water flooding recovery;When the floor pressure rises,it can not restore the radius of the aperture to the original state,the formation of a strong elastoplastic deformation,is not conducive to reservoir developmentIn order to overcome the influence of pressure gradient and stress sensitivity in low permeability and low permeability reservoirs,the development of such reservoirs is quite different from that of conventional sandstone reservoirs.The formation pressure level has a great influence on oil well productivity.At present,there are relatively few studies on the influence of formation pressure on oil production.In this paper,the Erdos W block is taken as an example.Based on the laboratory experiment,the pressure gradient and the stress of the reservoir are studied.Under the stress sensitive condition,the pressure gradient is studied and the low permeability oil-The results show that the pressure loss and porosity decrease,which further increases the difficulty of starting the pressure gradient and the fluid flow,and the permeability of the reservoir fluid,Thereby reducing oil production and oil production capacity.According to the combination of water injection time and reservoir driving method,the reservoir block classification is adopted,and the reservoir area is corrected by the relationship between oil and water well injection and production.The initial production capacity,current output,rapid decline and slow And other characteristics,indicating thatadvanced water injection can make the formation of a higher degree of pressure to achieve a higher initial oil production capacity to delay the rate of decreasing oil.Through the reasonable layer pressure research of the block,the reasonable adjustment scheme of the reservoir is designed,which can provide some technical reference for the development of the reservoir technology.