A tool for forming a cavern for hydrocarbon production includes a housing having a cavity. A rotary actuator is disposed in the cavity. A fluid dispenser has an internal chamber to receive an aqueous solution and one or more nozzles to dispense the aqueous solution. The fluid dispenser is coupled to the rotary actuator and is rotatable about a tool axis by the rotary actuator. One or more proximity sensors are disposed at a perimeter of the housing to measure a distance relative to the tool.