Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

摘要: Buckling of tubulars has been the subject many researches in past. However, models previous research always followed same assumptions: friction and rotation effects are ignored. The assumptions relatively far from reality. This paper focuses on rotational drill string horizontal well. differential equation dynamic buckling is established considering some various factors, including friction, string-borehole interaction, rotation, equations critical load sinusoidal spiral derived. Furthermore, curve during obtained. In addition, influence speed axis orbit also gained. results show that nothing to do with while amplitude frequency become larger increase speed, presents a completely different state development axial at ranges.