Abstract: With the comprehensive digital transformation of the oil and gas industry, Digital Twin has become a critical technology for building intelligent oil and gas fields. Using methods such as mechanism model simulation, data fusion, and digital mapping, digital twinning enables real-time data analysis, engineering predictive diagnosis, and other functions. This article discusses the characteristics of digital twinning technology in the context of drilling and completion engineering applications in oil and gas fields. It introduces the latest application progress of digital twinning technology in drilling design, monitoring during drilling, and well completion, and provides an overview of research methods in this field. Based on the current situation of oil and gas exploration and development, the article proposes a design framework for the application of digital twinning technology in drilling and completion engineering and summarizes the prospects of digital twinning technology. Considering the development of the oil and gas well industry and actual field requirements, the article provides recommendations for the research and development direction of digital twinning technology in the oil and gas industry. The proposed framework design and application prospects provide a theoretical foundation and methodological guidance for the research and application of digital twinning technology in the oil and gas industry.