Pre-drilling prediction study of pressure profiles based on 3D geomechanics
In order to solve the problem that the pressure profile evaluated based on adjacent well logging data is not the pre-diction results on the actual well trajectory to be drilled,a pre-drilling prediction method of pressure profile on the wellbore trajectory to be drilled based on three-dimensional geomechanics was proposed.Based on the horizon data of seismic interpre-tation,a three-dimensional geological model was constructed combining with the fault data and drilling layered data.Using the logging data of drilled well,the three-dimensional rock mechanics parameter field was obtained by the sequential Gaussian in-terpolation method,then the regional in-situ stress and pressure system were obtained by finite element numerical simulation,and the pressure profile on the wellbore trajectory to be drilled was obtained.The results show that the proposed method has high prediction accuracy.The error between the predicted value and measured value of pore pressure of drilled well is 3.57%,and the error between the predicted value and measured value of in-situ stress is 5.8%.The predicted horizon of the on-site two wells is highly consistent with the actual drilling horizon,and the predicted three-pressure profile can better ex-plain the downhole complexity in the actual drilling process.The research results can provide reliable data reference for pre-drilling geological engineering design,wellbore structure optimization and downhole complex problem prevention.