2018 Offshore Technology Yearbook

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Page 26 of 55 | December 2017 | 25 EXPLORATION | 2018 OFFSHORE TECHNOLOGY YEARBOOK early September with the Ram- part Deep well on Mississippi Canyon Block 116. Partner Stone Energy, encouraged by these results, is planning additional drilling on the Derbio prospect, up-dip from Rampart Deep. Pos - itive results at Derbio could lead to joint development of the two plays, developed as a multiwell tieback to Stone's Pompano plat- form in 2019. BHP spudded the Wildling-2 ultradeepwater well on Green Canyon Block 520 in 4,030 ft water depth, discovering oil in multiple horizons, and Shell hit oil with the its deepwater Whale exploration well on Alaminos Canyon Block 772, approximately 200 miles offshore. Drilling continues in Latin America In early March, Anadarko found gas in the Carib- bean in deepwater offshore Colombia with the Purple Angel-1 well, reporting a second find the following day with Purple Angel-2. The wells are within 3 miles of the operator's play-opening Kro- nos-1, drilled in July 2015. Purple Angel-1 encoun- tered between 70 and 110 net feet of natural gas pay, confirming a gas column greater than 1,700 ft. Two months later, Anadarko hit gas again with the Gorgon exploration well, approximately 20 mi northeast of Kronos. June saw two significant shallow-water gas finds for BP Trinidad & Tobago (bpTT). The Savannah and Macadamia exploration wells discovered approximately 2 Tcf of gas in place. Savannah was drilled into an untested fault block 50 miles off the southeast coast of Trin - idad uncovering approximately 650 net feet of pay. Based on the success of the Savannah well, bpTT expects to develop these reservoirs via future tieback to the Juniper platform, which came online in August. Macadamia penetrated hydrocarbon-bearing reservoirs in seven inter- vals with approximately 600 feet net pay. Com- bined with existing reservoirs, the Macadamia discovery is expected to support a new platform sometime after 2020. Meanwhile, Exxon Mobil met with great suc - cess offshore Guyana, reporting in January the Payara-1 well encountered more than 95 ft of high-quality, oil-bearing sandstone reservoirs in 6,660 ft (2,030 m) water depth on the Stabroek Block 10 miles (16 km) northwest of the giant Liza discovery. In March the operator reported its Snoek well encountered more than 82 ft (25 m) of high-quality, oil-bearing sandstone reservoirs 5 miles (8 km) southeast of Liza-1. And in July, the company announced it had discovered additional oil in the Payara reservoir, increasing the total Payara discovery to approximately 500 MMboe. Payara-2 confirmed the second giant field dis- covery in Guyana. According to Exxon Mobil, Payara, Liza and the adjacent satellite discoveries at Snoek and Liza Deep provide the foundation for world class oil developments. In a year that was troubled for Petrobras, the NOC had good fortune with exploration efforts in the Campos Basin offshore Brazil that led to a presalt discovery in August. The company reported its Poraque Alto well hit oil on the Marlim Sul Field, marking the first commercial presalt oil discovery in this area. This success demonstrates potential for new discoveries in Brazil's mature basins. Transocean's ultradeepwater drillship, the Deepwater Invictus, drilled the Wildling-2 well for BHP in the GoM. The vessel joined Transocean's fleet in 2014. (Photo courtesy of Transocean)

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