Permafrost is typical temperature-sensitive sediment, and geo-mechanical issues such as wellbore collapse and sand production are prone to occur during the oil and gas development. Therefore, it is crucial to elucidate the patterns and mechanisms of wellbore instability throughout the drilling process and to develop/propose effective control strategies. In this study, based on sensitivity analysis of wellbore stability, a method for determining the safe windows of drilling fluid temperature, density, and salinity was proposed, along with corresponding measures for preventing wellbore collapse. The investigation results indicate that the collapse of sediments around the wellbore was primarily... More >

Based on in-depth investigation and analysis of the current situation of CCUS development in China, this paper combs and summarizes the technical status and development trends of the carbon capture, transportation, utilization and storage industry (CCUS) at home and abroad in recent years through comprehensive research, and conducts in-depth discussions on the existing technical problems and risks. The analysis shows that in the short term, China's CCUS will still be dominated by CO2-EOR (Enhanced Oil Recovery) utilization. CO2 mineralization utilization and chemical utilization will gain new development space with technological breakthroughs. Pure carbon dioxide storage is restricted by pol... More >