A new method of obtaining reservoir static pressure——by taking Bohai P oilfield as an example

Reservoir static pressure is one of the important parameters in the process of reservoir dynamic management.In Bohai P oilfield,the converting method for pressure measurement while drilling,unstable well test method and reservoir dynamic knowledge are generally used to predict static pressure.In recent years,due to the multi-layer production,the pressure difference of each layer is strong,and the pressure is complex.At present,the data of pressure measurement while drilling and unstable well test are less and less.The accuracy of static pressure data obtained only by dynamic knowledge is difficult to guarantee.In this paper,based on the pressure data of pumping stage and the theory of coupling point of pressure pipe flow and seepage flow under wellbore reservoir effect,the method of predicting reservoir static pressure by linear regression coefficient(R~2) maximum method is proposed for the first time.Compared with converted reservoir static pressure while drilling,static pressure interpreted by well testing and static pressure predicted by reservoir dynamic cognition of 24 wells in Bohai P oilfield,and the results were highly consistent.This method has the characteristics of short time,high efficiency and low cost,which provides a new method for new drilling pressure prediction.