Stress analysis of single-bending screw drill tool with large angle

To meet the demand of higher built-up rate,single-bending screw drill tool with large angle is used during the drilling of the moderate-and short-radius horizontal well.However,it is difficult to waltz through the horizontal section as the displacement in the place of bit is larger and it's necessary to study the mechanical characteristics when getting across the horizontal section for the reasonable selection of crew drill tool assembly. With FEM and taking 7″ casing for example,stress distribution when getting across the horizontal section is determined as well as the various bend angles effects on single-bending screw drill tool presented in this paper.