New world-class gas find for Anadarko in Mozambique
The discovery will increase the reserves in the block by 66%
Anadarko, already moving ahead with a liquefied natural gas (LNG) complex for its Prosperidade fields in Area 1, has made a discovery which increases its reserves in the block by up to 66%. The company said its well into the Golfinho structure, just 22 km northeast of Prosperidade, found a net 59 metres of gas zones and “significantly expands the tremendous resource potential” of the area.
According to Anadarko, Golfinho holds recoverable reserves in the range 200 billion-570bn cubic metres (cm), out of gas-in-place of 370bn-1,275bn cm. The company’s latest estimate for recoverable reserves in the Prosperidade complex – covering the Windjammer, Barquentine, Lagosta and Camarão discoveries – is in the range of 480bn-850bn cm, so reserves in Area 1could now amount to as much as 1,420bn cm recoverable.
Further increases seem likely, in view of the 15-plus undrilled structures and leads identified by Anadarko in Area 1 and the high drilling success rates being achieved. Anadarko is now moving the Belford Dolphin drillship to the Atum structure, immediately south of Golfinho, and also plans to drill wells at Orca, south of Atum, and Linguado, in the northeast of the block. Seven or eight wells are due to be drilled this year. Meanwhile, Eni, operator for Area 4, adjacent and to the east of Area 1, has found 1,133bn cm of gas-in-place with only three wells drilled (PE 5/12 p36).
Because Golfinho lies only about 15 km offshore, in water 1,027 metres deep, the discovery could lower the overall cost of supplying gas from the Area 1 fields to the planned LNG complex on the coast. Golfinho might land through a short direct pipeline, while outline studies for the Prosperidade fields envisage subsea facilities producing to a floating hub, to be about 55 km offshore, from which gas will be landed.
Before the Golfinho discovery, Anadarko had said it planned to award the front-end engineering and design contract for the LNG complex in May. Conceptual design studies, carried out by KBR, envisage an initial two LNG trains of 5 million tonnes a year each, with subsequent expansions to six or more trains. A final investment decision is planned for late-2013, with start-up targeted for 2018.
Anadarko’s other drillship, the Deepwater Millennium, is carrying out flow-tests on the Prosperidade wells. The company says three wells have now been tested, all flowing at equipment-limited rates of about 2.8m cm/d. The high flow-rates give confidence that production wells could be designed to flow 5.7m cm/d, the company said.