1) Original wells at Leland Horse field produced casing and tubing together but production decreased when casings were shut in due to friction losses in the tubing. 2) A casing slipstreaming system was developed to intermittently produce the casing to allow extra gas to flow while maintaining critical rate in the tubing to prevent liquids loading. 3) The system uses automation including SCADA to control a choke and monitor tubing flow from remote sites. It increased production by 5 to 25 million cubic feet per day with a payback period of less than 13 days. Casing slipstreaming is now standard for new wells in the area.