Jarring in Drilling Operations Jarring is a drilling operation technique used to deliver an impact force downhole to free stuck drilling tools or pipe. This technique involves a drilling jar, which is a mechanical or hydraulic tool placed in the drill string. Purpose of Jarring 1. Free stuck pipe or tools (due to differential sticking, key seating, or hole collapse). 2. Assist in fishing operations (retrieving lost or stuck equipment). 3. Loosen tight spots in the wellbore. 4. Improve operationa