Portable downforce system and method

A portable downforce system comprising,

• a first frame assembly coupled to a slip assembly for engaging wellbore tubulars,
• a base member connected to the first frame assembly, and
• an actuator configured to extend and/or retract the first frame assembly between a first position and a second position,
• wherein the second position is laterally displaced from the first position along a path formed by extension of the actuator, and
• wherein the base member is connected to a mast of a service rig,
• wherein the first position is a retracted position away from a tubular path into a wellbore and the second position is an extended position aligned with the tubular path into the wellbore, and
• wherein the first frame assembly extends in a generally horizontal direction orthogonal to the wellbore.