Latin American Deepwater Exploration: Anadarko in Colombia (2012–2019)
While the deepwater Gulf of Mexico and Brazil's pre-salt layers have historically dominated hemispheric exploration capital, the Colombian Caribbean emerged as a highly prospective, yet technically challenging, frontier basin. Between 2012 and 2019, Anadarko, operating in a 50/50 joint venture with Colombia's state-owned Ecopetrol, embarked on an aggressive exploration campaign to test the ultra-deepwater potential of the Magdalena Fan and the Colombia Basin.
Kronos, Purple Angel, and Gorgon Discoveries
Anadarko's expansive seismic campaigns—including the massive 30,000 square kilometer Esmeralda 3D survey—identified numerous amplitude-versus-offset (AVO) anomalies and flatspots indicating a potential world-class liquids-rich petroleum system. This geological data catalyzed a multi-year drilling campaign across blocks covering 14,900 square kilometers.
| Exploration Well Name | Block / Area | Spud/Discovery Year | Water Depth | Technical Result |
| Kronos-1 | Fuerte Sur | 2015 | ~1,500m+ | Gas Discovery (520m gas column estimated) |
| Calasu-1 | Fuerte Norte | 2015 | N/A | Gas Accumulation Detected |
| Purple Angel-1 | Purple Angel | 2017 | 1,835m | Gas Discovery (21-34m net pay) |
| Gorgon-1 | Purple Angel | 2017 | 2,316m | Gas Discovery (80-110m net pay) |
The drilling of the Gorgon-1 well in 2017 utilizing the Bolette Dolphin drillship established a national record for Colombia, crossing a water depth of 2,316 meters (more than 1.3 kilometers below the marine bed). The well successfully encountered between 80 and 110 meters of net gas sand, confirming the massive extension of the gas province first identified by the Kronos-1 well two years prior.
Despite the technical success of proving a working hydrocarbon system, the exceptionally high costs of ultra-deepwater development and the total lack of existing offshore infrastructure rendered the discoveries non-commercial at the time of drilling. Following Occidental’s acquisition of Anadarko in 2019, the company exited the Colombian offshore blocks, leaving Ecopetrol with 100% working interest. Driven by Colombia's urgent need to offset looming domestic gas shortages, Ecopetrol subsequently partnered with Shell, farming out a 50% stake to finance further appraisal drilling and production testing in the region by late 2021.
Commercial and Operational Service Execution (2012–2019)
Exploration in this frontier basin demanded top-tier deepwater drilling and casing technologies. The work done to support these international Anadarko wells involved deploying specialized casing equipment, downhole tools, and large O.D. tubulars capable of withstanding the immense hydrostatic pressures of ultra-deepwater environments. Managing the supply chain for a 6th-generation drillship like the Bolette Dolphin operating deep offshore required extensive logistical coordination, directed by international business development managers based in Houston. The commercial approach involved establishing rigorous Master Service Agreements that adhered tightly to the operator's safety and quality standards, effectively managing the high daily burn rates associated with deepwater exploration.
