US oil and gas company Talos Energy has announced the successful drill stem test (DST) of the Zama-2 side-track well (Zama-2 ST1) in Block 7, offshore Mexico.

Talos operates Block 7 with a 35% operating interest in a consortium with Premier Oil (25%) and Sierra Oil and Gas (40%). The Zama discovery is located in the Suerte Basin in the Gulf of Mexico, at water depths of approximately 165m.

The field was first discovered in July 2017, and the first part of the Zama appraisal programme completed on January 2019. Following the completion of this first appraisal, the goals of the Zama-2 ST1 well were to perform well tests in the northern limits of the discovery and acquire a whole core in order to collect data about the rock properties in the area.

DST operations on the Zama-2 ST1 well achieved a combined flow rate of 7,426 barrels of oil per day from two separate flow tests, with the consortium expecting a peak production rate of 150,000-175,000 barrels of oil equivalent per day. The Zama-2 ST1 well also logged 873ft of gross oil-bearing reservoir and a consistent net-to-gross ratio range of 68-73%.

Talos reported that an “unprecedented” 714ft of whole core was cut with 98% recovery, the longest whole core acquired by a single well in offshore Mexico’s history.

Premier Oil CEO Tony Durrant said: “We are very pleased by the productivity demonstrated by this well and we continue to collect further evidence that Zama has a world-class reservoir with excellent quality and well-connected sands.

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“This has positive implications for the expected ultimate recovery from the field and will help us to optimise the field development. We look forward to the conclusion of the Block 7 appraisal programme with the Zama-3 well.”

The consortium now plans to drill Zama-3, the final Block 7 appraisal well, to confirm lateral reservoir quality and continuity in the southern areas of the field.

Talos Energy CEO Timothy S. Duncan said: “The Zama-2 ST1 operation was another success for the Consortium. With each stage of the appraisal program, our experience and understanding has continued to strengthen in the region, and this is evident in our operational performance.

“The coring operation allowed us to gather important rock samples, which indicate excellent rock properties with similarities to world-class reservoirs in the United States Gulf of Mexico.

“Our goal is to reach final investment decision and first production as soon as possible. With the continued focus of the Talos operating team, our partners, and local workforce, Zama will be an impactful asset for the Company and the Mexican economy, and we are proud to play a key role in its development.”