The vital technological breakthroughs in horizontal drilling and multi-stage hydraulic fracturing have promoted a great leap in the development of the shale oil and gas industry and profoundly reshaped the global energy landscape. This study reviewed the latest technological advances in horizontal drilling and well completion for shale oil and gas both in China and internationally. A comprehensive comparative analysis was conducted across the casing program，rotary steering，automated drilling rigs，intelligent drilling，high-performance drilling fluids and lost circulation prevention and control，as well as fracturing equipment and monitoring technologies. The drilling time，horizontal wellbore length，and "one-trip" ratio in China showed considerable room for improvement，compared to those abroad. Therefore，efforts of research and development shall be strengthened for automated drilling rigs，next-generation rotary steering tools，high-efficiency polycrystalline diamond compact（PDC） bits，high-torque screws，and multi-stage fracturing and monitoring technologies，to enhance the "one-trip" ratio of long horizontal wellbores and boost production per well，promote the digital and intelligent transformation of drilling and completion technologies in China，and provide strong technical support for China's shale oil and gas revolution. 

During perforating，the high velocity jet penetrates the casing-cement-formation assembly. This not only causes damage to the cement sheath but also leads to bonding damage at the casing-cement interface. Such degradation tends to cause cross-flow of wellbore fluids along channels in the casing-cement interface，ultimately severely shortening the lifespan of oil and gas wells. Given this，a numerical model of high velocity jet penetration into the casing-cement-formation after perforating charge explosion is established using the fluid solid coupling method. The dynamic damage evolution law of the casing-cement bonding interface in the process of penetration is analyzed，and the effects of the cement sheath material parameter （shear modulus），cohesive unit parameter （fracture energy） and casing types on the damage area and maximum damage radius of the bonding interface are investigated. The results show that with the penetrating of jet，damage appears at the casing-cement sheath bonding interface，and the damage zone continuously expands. When the jet penetrates into the formation，the damage area reaches the maximum. With the increasing of shear modulus or fracture energy of cement sheath，the damage degree of the bonding interface decreases. Increasing borehole cleaning or using fiber containing cement slurry can reduce the damage of jet penetration to the bonding interface. When aluminum alloy，titanium alloy，nickel base alloy and other highly resistant casings are used，the damage area and maximum damage radius of the casing-cement bonding interface increase significantly during perforation penetration. The findings of this research provide theoretical support for wellbore integrity protection and engineering parameters optimization during perforating.

Drilling fluid is the core technology of deep and ultra-deep drilling and completion，and is one of the key technologies determining the success of a drilling operation. In this paper，the difficulties facing drilling fluids of deep and ultra-deep wells were analyzed，including wellbore instability，failure of drilling fluids at high-temperature and high-salinity conditions，high friction and environmental protection. Moreover，the latest technical progress of water- and oil-based drilling fluids in both China and other countries was reviewed. It was concluded that there are still large technical gaps in temperature and salinity resistance of drilling fluids between domestic drilling fluid systems and foreign advanced technologies，and therefore，it is urgent to strengthen research and development  efforts in terms of failure mechanisms of drilling fluid agents，anti-ultra-high-temperature drilling fluid agents and supporting technologies for special formations.