The initial buildout of the Nautilus gas gathering system in the Delaware Basin was completed ahead of schedule, with first flow on June 2, Crestwood Equity Partners LP (NYSE: CEQP) said on June 6.

The initial buildout incorporated 20 receipt point meters, 60 mi. of pipeline, a 24-mile high pressure header system, 10,800 horsepower of compression and a high pressure delivery point.

Not only was this construction phase completed early, but was under budget and without a single safety incident, Crestwood said in a statement. The system is owned by Crestwood Permian Basin Holdings LLC, a JV between Crestwood and First Reserve that was formed to develop, own and operate midstream infrastructure in the Delaware. Nautilus was not expected to go into service until July 1.

“The success of this project demonstrates our ability to capture and execute on accretive greenfield opportunities in and around our current asset footprint, and our commitment to best-in-class customer service, safe operations and environmental stewardship.” Said J. Heath Deneke, COO and president of Crestwood’s pipeline services group.

Nautilus is the result of an agreement signed in September 2016 with SWEPI LP, a Royal Dutch Shell plc (NYSE: RDS.A) subsidiary, to operate a natural gas gathering system in Shell’s acreage in the basin. It sprawls across about 100,000 acres in Loving, Reeves and Ward counties, Texas, and will ultimately include 194 miles of low-pressure gathering lines, 36 miles of high-pressure trunk lines and centralized compression facilities which are expandable over time as production increases, providing gas gathering capacity of at least 250 MMcf/d.