Abstract: Pai 6 north block of Chunfeng oilfield belongs to a shallow extra heavy oil reservoir, which has the characteristics of shallow burial depth, loose reservoir cementation and thin sand body, etc. In order to improve the production and recovery single well, the horizontal well steam stimulation technology is adopted. Aiming at the difficult problems of horizontal well construction in this area, such as horizontal well trajectory control,geo-steering and casing running, etc., the research and practice of well trajectory optimization, trajectory control and drilling fluid displacement were carried out. Field practice shows that by adopting good technical measures, the first 10 horizontal wells in Pai 6 north have been successfully completed without major and complex situations, the project quality meets the requirements of relevant standards, and good results have been achieved.