Drawworks Hoisting System (Core Power Hoisting Assembly of the Workover Rig) The drawworks is the core component of workover operations that does the most work and is used most frequently, undertaking all heavy-load operations including running/pulling tubing, sucker rods, fishing tools, milling tools, lifting fish (lost tools), jarring for stuck-pipe release, and suspending strings. 1. Drawworks Drum Main Body A large one-piece cast-steel drum with deep-grooved non-slip wire