Against the backdrop of the continuous growth of global energy demand and the gradual depletion of onshore oil resources,the development of offshore oil resources has become a major component of current oil extraction.among them,offshore oil completion technology,as a key technology to improve the efficiency and production efficiency of oil and gas field development,is of great significance for research.The article delves into the technological innovation of offshore oil well completion,the development of green environmental protection technologies,and the application of digital and intelligent technologies,in order to provide forward-looking insights and references for the field of offshore oil development,promote technological progress and sustainable development in this field.