Statoil and ExxonMobil have announced the results from the first drill stem test in the Tanzania Block 2 offshore discoveries. The data acquired is important to reduce technical uncertainties in any future offshore and liquefied natural gas (LNG) development.
The Zafarani-2 operation tested two separate intervals and flowed at a maximum of 66 million ft3/d of gas, constrained by equipment. The tests confirmed good reservoir quality and connectivity.
The drill stem test operation was performed through a re-entry in the Zafarani-2 well, in 2400 m water depth and approximately 80 km off the coast of southern Tanzania.
“The ongoing appraisal programme is crucial to firm up the design and development basis for bringing gas to shore and a first phase onshore LNG project in Tanzania,” commented Øystein Michelsen, Statoil’s Tanzania country manager.
“We are now working constructively with our co-venturer ExxonMobil, Blocks 1, 3 & 4 and the Tanzanian authorities to progress the plans for a joint LNG plant development.”
The production well rate potentials are estimated to be higher than the equipment constrained rates obtained during the test. The Zafarani-2 operation will be followed by the appraisal well Zafarani-3, which concludes the planned appraisal in the Zafarani reservoir, the cornerstone for a field development in Tanzania Block 2.
Natural gas discovery
The Zafarani-2 well test announcement follows the Mronge-1 discovery made in December 2013, which was the fifth discovery in Block 2 and brought the natural gas in place volumes up to 17-20 trillion ft3.
The Mronge-1 was preceded by three successful high-impact gas discoveries during the first drilling phase with Tangawizi-1, Zafarani-1 and Lavani-1, and a deeper discovery in a separate reservoir in Lavani-2.
Statoil and ExxonMobil
Statoil operates the licence on Block 2 on behalf of Tanzania Petroleum Development Corporation (TPDC) and has a 65% working interest, with ExxonMobil Exploration and Production Tanzania Limited holding the remaining 35%.
Adapted from press release by Katie Woodward
Read the article online at: https://www.oilfieldtechnology.com/exploration/03032014/statoil_tanzania_offshore_and_lng_update_388/