Study On Reservoir Pressure Prediction And Control Technology In Daqing Peripheral Oilfield

Daqing peripheral oilfield has entered the stage of infill adjustment,so it is necessary to improve injection production mode and improve oil displacement efficiency.The average well spacing of the development block is 300 meters,and the spacing is shortened by 150 meters by means of inter well adding,well spacing,adding and discharging.During the drilling of the infill adjustment well,the well near the injection well needs to be shut in,and it is affected by such factors as faults,reservoirs,low permeability and reservoir heterogeneity.During the injection,the reservoir is formed abnormally high pressure.In the face of reservoir pressure distribution is complex,well drilling and shut in this larger problem of oilfield development,distribution prediction technology and safety drilling technology of reservoir pressure need to further study the condition of production and injection,shut in scheme suitable for the establishment of adjustment wells in Daqing oil field.Through the research in this paper,the prediction accuracy of reservoir formation pressure in reservoir adjustment wells can be improved,and the complex accidents during drilling construction will be reduced.The final establishment for adjustment well drilling in Daqing oil field drilling standard,suitable for low porosity and low permeability reservoir environment,meet the post peripheral oilfield development adjustment needs,reduce the water injection well drilling and shut in oil field development brings adverse effects to.In this paper,through a comprehensive analysis of the situation,the Daqing oilfield reservoir geological mineral characteristics,reservoir pore structure,fault characteristics and fracture characteristics of materials,to fully grasp the geological characteristics of the block,and then according to the principle of percolation mechanics,reservoir dynamic analysis,modern interpretation and other methods to set up the normal injection conditions the pressure distribution model and change the injection conditions of the pressure distribution model,predict the formation pressure,and coMPared with the measured pressure,draw out the pressure distribution and the pressure profile.Then,the characteristics of pressure distribution and the influence factors of reservoir pressure are analyzed systematically.Finally,on the basis of analyzing the rules of reservoir drilling and depressurization and the rule of overflow and depressurization of injection wells,a set of drilling standards for adjustment drilling in Daqing peripheral oilfield has been formed.The research shows that the injection conditions of reservoir pressure prediction technology applied to the peripheral low permeability reservoir under heterogeneous conditions of different block formationpressure prediction under condition for guiding drilling off plan and reservoir pressure regulation;water injection wells put pressure spill application control technique can effectively reduce the injection imbalance,fault block reservoir layer well area pressure,reduce the occurrence of drilling complex accidents,reduce drilling cost.But the control effect of fractured high pressure reservoir is poor;the drilling criterion of adjustment well in Daqing peripheral oilfield is suitable for low porosity and low permeability reservoir environment,and meets the need of later infilling adjustment of external waterflood development oilfield.