Challenges and Technology Trends Prediction of Deep Exploration Well Drilling in Bohai Sea
In recent years,more than 30%of newly discovered offshore oil and gas structures have been found in deep layers,making deep oil and gas an important resources for future energy supply growth.China National Off-shore Oil Corporation(CNOOC)has achieved technological breakthroughs in the Bohai region,which serves as the main field for deep oil and gas reservoir.A series of key technologies have been developed,including accurate prediction and monitoring of formation pressure,quantitative evaluation of fractured leakage,multi-field coupled wellbore stability analysis,ROP optimization in deep hard rock drilling and protection of fractured reservoirs,ena-bling efficient exploration and development of oil and gas resources in the Bohai region at depths ranging from 5,000 meters to 5,500 meters,thus meeting the requirements of deep oil and gas drilling.Based on these key technologies,a series of deep oil and gas fields such as BZ19-6 condensate gas field,BZ13-2 deep oil field,and BZ26-6100-million-tonne buried hill oil field have been successfully drilled and discovered in the Bohai Sea.The drilling time decreased from the initial 140 days to less than 40 days with a record-setting operation time of only 31 days for a 5,100-meter well,building a strong foundation for further exploration and development of deep oil and gas reserves in the Bohai Sea.
deep oil and gasROP optimizationfractured reservoirreservoir protection
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