Abstract: Centralizing casing by centralizer is an important technical treatment of improving cementing quality for horizontal and high angle deviated wells. According to the problems in the application of common centralizer, the force bearing status of the centralizer moving in horizontal wellbore is analyzed, and the rigid casing centralizer with eccentric truck is developed. The eccentric structure of the tool is introduced, as well as the working principle that adjusting the centralizing azimuth by the automatic rotation of two kinds directions. The lab and field experiments show that the tool can effectively improve the centralizing degree of the casing in horizontal wells, as well as the cementing quality for horizontal and high angle deviated wells.