Study On The Countermeasure Of Formation Pressure Recovery In Pubei X Fault Block

After more than 30 years of development,block X of Pubei has entered the late stage of waterflooding development.After a long-term waterflooding development,the formation energy is continuously deficient.There is no follow-up energy supplement,which causes the formation pressure to drop year by year.It makes the oil wells in the block in the state of high water cut,and the formation pressure remains low,which is difficult to meet the needs of waterflooding development in the high water cut period.The oil well production is lower.Therefore,it is urgent to study the formation pressure recovery countermeasures of Putaohua reservoir in Pubei X fault block.In this paper,according to the actual geological conditions of fault block X in Pubei,the reservoir geological model and numerical model are established,and the related numerical simulation research is carried out.Combined with the genesis and characteristics of different types of sand bodies,the study on the identification and division of single sand bodies is carried out,and a set of division standards for single sand bodies suitable for geological characteristics is formulated to guide the identification,description and division of single sand bodies.The single sand bodies obtained are taken as the study unit of formation pressure,which provides a basic study unit for the subsequent study of formation pressure recovery countermeasures.The injection production status of pressure unit is evaluated by using the method of injection production perfection degree coefficient.Through the numerical simulation,the potential of pressure cell is analyzed,and the potential cell of pressure adjustment is optimized.In this paper,the reasonable formation pressure is calculated by many reservoir engineering methods such as hydrostatic column pressure method,material balance method,minimum natural decline rate method and empirical formula method.Combined with numerical simulation method,the calculation results are compared and analyzed,and the best reasonable formation pressure calculation method is selected.Combined with the material balance formula and the empirical formula,the reasonable formula of formation pressure recovery rate is derived and verified by the numerical simulation method.Finally,the reasonable boundary of formation pressure recovery parameters is obtained.Based on the above research results,the research of formation pressure recovery method is carried out.By means of numerical simulation,the design schemes of different methods are compared and analyzed,and finally a set of reasonable formation pressure recovery countermeasures with good adaptability is formulated.