Wellbore integrity is a key factor to ensuring the safe and sustainable operation of oil and gas wells throughout the life cycle. As the global energy exploitation expands to regions with deep formations，deep seas and complex geological conditions，the wellbore barrier system is facing unprecedented challenges due to extreme conditions such as high temperature and high pressure （HTHP），high stresses and corrosive media. Over recent years，great progress has been made in research on wellbore integrity thanks to the development of new materials，applications of intelligent monitoring techniques and innovation of risk assessment models. This paper summarizes the research status of multiple aspects of wellbore integrity，such as HTHP-tolerant materials，composite materials resistant to hydrogen penetration，smart sensors and data-driven prediction models，and multi-factor risk assessment methods. Moreover，it reviews the current challenges in long-term durability validation of materials，reliability of intelligent monitoring systems and applicability of multi-scale models as well as special requirements of emerging application scenarios for Carbon Neutrality. This paper provides references for safe development of oil and gas and integrity management of subsurface storage and transportation facilities for energy transformation.

Carbon based materials have a wide absorption range for sunlight，high photothermal conversion efficiency，and excellent thermal conductivity and can be used for photothermal conversion of solar power. They are key materials for achieving green utilization of renewable solar energy. However，solar radiation is intermittent，which is unfavorable for the large-scale utilization of solar energy. Therefore，by combining carbon based photothermal materials with phase change materials，the solar energy absorbed by the photothermal materials can be stored in the phase change materials for nighttime use. This research summarized and classified carbon based photothermal conversion materials，reviewed the composite encapsulation strategies of carbon based photothermal conversionand phase change materials，summarized the effects of different combination methods on photothermal conversion efficiency and thermal storage performance，and briefly introduced the applications of photothermal phase change composites in solar water heaters，building energy conservation，and human-body thermal management. Finally，the future development direction of carbon based photothermal phase change composites wasanalyzed，providing references for the preparation of new photothermal phase change composites with high conversion efficiency.

Tangdong Block of Dagang Oilfield has complex geology. The main target layers are the third member of Dongying Formation and Shahejie Formation. The target layers are deeply buried and rather thick, and the damage mechanisms between the reservoirs are very different. The applications of fine calcium carbonate and plugging agents for drilling fluids in reservoir damage prevention present insufficient performance for exploration and appraisal wells in this block, due to the low technical adaptiveness to the reservoirs and inferior practice management. The core permeability recovery rate for the reservoirs is only 67.5%. According to the core sensitivity evaluation and casting thin section analysis results of Well Tangdong 9X6, a reservoir protection technology system was developed for the drilling of the Tangdong exploration and appraisal wells, according to the potential damage factors. The protection system adopts the film-forming plugging reservoir protection technology and combines the applications of the single-well multi-layer/multi-point design method. The efficient implementation of the developed technology system is ensured with the help of refined technology implementation management and high-quality real-time evaluation. The film-forming plugging reservoir protection technology was applied to five wells in this block. The dynamic fluid loss of drilling fluids was reduced by 25.7%, and the permeability recovery rate was increased by 13.1%.  All the five wells met the geological expectations. Two wells have delivered high production, with initial daily production of 61.3 t and 101.1 t, respectively, which indicates good performance.