Prediction Of Carbonate Formation Pressure In The Shuangyushi Block

The drilling engineering geology feature of Shuangyushi structure is very complex.There are multiple sets of pressure systems and micro-fractures in the longitudinal direction of the formation,easily causing sophisticated downhole accidents such as leakage,wellbore collapse,sticking even blow out to occur frequently;Consequently,it’s necessary to study the formation pressure of this area.However,the deeper layer formation of the structure is carbonate stratum,which makes the precise pressure prediction of this area based on the previous compaction theory impractical.In this paper,based on the analysis and the summary of the previous method for pressure prediction in carbonate formation,the seismic data in Shuangyushi structure and well logging data of ST1 well are analyzed and a series of data is also obtained through rock core experiment over Qixia group.According to the data obtained above,the formation pressure of well ST1 is predicted by Eaton,fillippone and sonic time difference method and the results of prediction is compared with the measured formation pressure.The optimal model is selected and the prediction of the formation pressure of the carbonate rock formation of the double fish stone is achieved.The results show that the seismic method can accurately predict the formation pressure and provide some help for the future field engineering practice and pressure prediction research.