Research and Application of Integrated Geological Engineering Technology for Deep High-Pressure Wells in the Bozhong Depression

The geological conditions of the deep buried hills in the Bozhong Depression of the Bohai Bay Basin are complex, with deep burial of the target layer, multiple geological layers encountered during drilling, complex and variable lithology, and significant changes in the formation pressure system. During the drilling process, complex situations occur frequently, and weak layers are prone to leakage, which affects the exploration and development process. By predicting the risk of wellbore leakage before drilling and correcting formation pressure, making precise decisions in the high-pressure section during drilling, accurately capturing the buried hill interface, and identifying and controlling the formation pressure while drilling, technological breakthroughs have been achieved. The drilling design and adjustment plan during drilling have been adjusted and optimized, and the integrated geological engineering technology for the entire process of deep high-pressure wells in the Bozhong Depression has been established. After the application of integrated geological engineering technology throughout the entire process in 20 deep high-pressure exploration wells in Bohai Oilfield, the drilling complexity has been reduced by 60%, the processing time for complex situations such as well leakage and overflow has been reduced by 40%, the accuracy of identifying buried hill interfaces has been 100%, and the cost of a single well has been saved by more than 30 million yuan. The integrated technology of whole process geological engineering provides a technical approach for deep and ultra deep exploration and development of Bohai Oilfield, and has good application prospects.