  Wellbore friction is one of the biggest concerns when drilling due to its
relation to the total cost. The catenary concept was introduced to reduce
wellbore friction, but it requires detailed analyses. This project would fill
this gap. A catenary shape is simply the natural shape of a rope, chain, or
drill string. The drill string will then hang freely inside the wellbore.
Perfectly, there should be no contact between the hole and the string, and thus
no friction. Torque and drag should be minimized this way. A case study is
introduced to examine the outcome between Catenary Trajectory Design and
traditional 2D Arc design. The calculation procedure of Catenary Trajectory and
2D Arc Design can be found in an MS Excel spreadsheet which is easy to use and
reliable for designing catenary well trajectories for extended-reach wells.
