Study On Pressure Change Law Before And After Drilling-shut Period In East Xing-7 Area

Applying Petrel geological modeling software,The fault model,three-dimensional structural model,sedimentary facies model and attribute model under facies control are established.The attribute model includes porosity,permeability,oil saturation and effective thickness model.The sensitivity parameters of pressure fitting are studied,and the sensitivity parameters affecting average formation pressure and single well flowing pressure are studied.According to the average formation pressure fitting,four parameters of formation water compressibility coefficient,formation oil compressibility coefficient,rock compressibility coefficient and comprehensive compressibility coefficient are determined.According to the flow pressure fitting of single well,the adjustment ranges of skin factor,permeability near wellbore zone and well index of oil and water wells with different measures under different conditions are determined.The well test interpretation formation pressure is used to correct the numerical simulation formation pressure,and the flowing pressure of the numerical simulation oil well is corrected by using the hydrodynamic level test data.The historical matching of geological reserves,formation pressure of single well,average formation pressure,flow pressure of single well,fluid production,water cut,water cut of single well,oil production and other indicators is carried out.The fitting index can meet the accuracy requirement.The variation of pressure and fluid in three different well patterns,four different sedimentary facies and 75 layers before and after drilling-shut are studied,and the development index changes before and after drilling-shut are analyzed.Based on the law of pressure and fluid changes before and after drilling-shut,and the principle of minimizing the impact on development index,4 programs of drilling-shut and recovery water injection after drilling-shut are designed.By comparing the changes of pressure,fluid production,oil production and water cut during drilling-shut and recovery stage,the optimal drilling-shut and recovery water injection program are given.