Research On Productivity Prediction Due To Pressure Recovery Of Low Permeability Formation After First Shut

The study collets the static data first and analyses the geological characteristics of Budate Group reservoir by studying and describing pore types,permeability and porosity, transivity distribution after core and microscope description. Then based on the geological static model, combined with well testing theory,the laws for fluid flow and the impact parameters of different formation as the basement of productivity evaluation research are set up.Unlike the regular study on pressure recovery by fitting typical plate and finding the fit point data to find out the reservoir parameters,or using the measured data to draw the double logarithmic curve in order to get the reservoir characteristics,this research firstly gets the analytical solutions for theory chart,then takes the measured data and relative well parameters into analytical solutions in order to get history pressure curve simulation inferred by theory model. After that we observe the changes of history pressure curve by using different reservoir parameters to analyse the influence on the measured pressure recovery curve by reservoir conditions. The study also analyses the time for the particular point and the pressure as the conditions for reservoir pressure curves recovery by using double logarithmic curve characteristic value determination method.