Petronas Carigali plugged and abandoned wildcat Yetaung 1 in the Yetagun Development and Production Area, offshore Mergui Terrace, around mid-February 2019, with results unreported. The well reached a total depth of 2,150 m in the 12 1/4â casing. The operator acquired wireline logs, sampling and formation testing prior to abandoning the well.  Yetaung 1 was spudded in late January 2019, drilled using Japan Drillingâs âHakuryu-5â S/S. The well, located approximately 20 km south of the Yetagun field facilities, was likely intended to find additional reserves to sustain future production from Yetagun. The well was likely targeting Lower-Middle Miocene fluvial sandstones of the Mergui Group, which are producing at Yetagun.  After the completion of Yetaung 1, the rig was mobilized to drill exploration well Yetagun Southeast 1. The operator has options to drill up to two additional exploration wells, also in the Yetagun Southeast area. According to IHS Petrodata, the rig is under contract until March 2019 (excluding the options).  The exploration drilling campaign was previously expected to commence in late 2018. Reportedly, in early August 2018 Petronas was in discussion with Japan Drilling on bid clarifications as part of the rig tender process. The company awarded several service contracts for its exploration drilling campaign around May 2018.    Petronas has likewise commenced a new infill drilling campaign in the Yetagun field in mid-January 2019, using the âWest Vencedorâ tender-assist rig (TAR).  The last exploration activity in the area was wildcat Ye Thurein 1. The well, located in block M-12, outside of the Yetagun Development and Production Area, was plugged and abandoned with gas shows in October 2014. The well was drilled using UMWâs âNaga 1â S/S rig and reached TD at 1,528 m. The surface location of Ye Thurein is approximately 3.1 km northeast of the Aung Zay Ya 1 discovery made by M-12 JV led by Texaco in November 1997. Aung Zay Ya 1 discovered gas and condensate in Lower Pliocene clastics.  Right holders of the Yetagun Development and Production Area, as well as the surrounding blocks M-12, M-13 and M-14, are Petronas Carigali (operator, total interest of 40.9% via two subsidiaries), MOGE (20.5%), Nippon (19.3%) and PTTEP (19.3%).  Background Information  The field was discovered in December 1992 by Texaco's wildcat Yetagun 1, which was drilled to a TD of 2,513m and flowed at a combined rate of 74.3 MMcfg/d plus 1,787 bc/d from four DSTs. The discovery was initially appraised by four exploration wells in 1993, establishing commercial recoverable reserves of 1.8 Tcfg and 50 MMbc and forming the basis of a 15-year Gas Sale Agreement (GSA) signed with the Petroleum Authority of Thailand (PTT) under "take-or-pay" terms on 10th March 1997. Under the GSA, PTT is obliged to purchase gas up to 400 MMcfg/d (260 MMcfg/d as first-phase and an additional 140 MMcfg/d as second-phase of the supply agreement) once reserves exceed 2.0 Tcfg. With the confirmation of additional reserves, Premier has the right to increase the production up to 400 MMcfg/d plus 12,000 bc/d after 2003. In 1998 Premier drilled three successful exploration wells to delineate additional reserves, one each in the southern, eastern and northern parts of the Yetagun field, increasing the certified recoverable reserves to 2.6 Tcfg plus 82.3 MMbc.  On 16 September 2002 UK-based Premier Oil entered into an agreement to sell selected upstream assets worth US$ 359 million to Petronas for its 26.666% operated interest in the Yetagun gas/condensate field in Myanmar. With regard to the Burmese assets, which Petronas will now operate, the Malaysian state firm is also set to assume US$ 152 million in debt and pay Premier US$ 207 million in cash. This however is subject to revision, as the remaining partners will be offered the option to increase their right holdings, by acquiring part of the stake that Premier is proposing to sell to Petronas. This would reduce the amount of Yetagun assets to be acquired by Petronas and accordingly reduce the amount of assumed debt and cash payments.   Petronas Carigali completed a seismic survey on 15 May 2007, using the VeritasCGG "Pacific Sword" S/V to acquire 2D seismic data over the blocks M-12, M-13 and M-15. Petronas involvement in the area commenced with the acquisition of a 36.354% asset from Texaco in 1997 and Premier Oil took over operatorship from Texaco. In 2002, Petronas took over the operatorship after Premier sold its share to interested partners. Partners in blocks M-12 and M-13 are Petronas Carigali (40.9%, operator), MOGE (20.5%), PTTEP (19.3%) and Nippon (19.3%).   On 6 March 2007, Petronas Carigali plugged and abandoned sidetrack Yetagun North-east 1ST1 in the Yetagun Development and Production Area as a dry well, at a TD of approximately 2,410m. The principal hole, Yetagun North-east 1, was spudded on 31 January and drilled to a TD of 2,250m. It was the second of a two-four well exploration programme in the company's blocks in the basin, using the "Hakuryu III" S/S.  Petronas Carigali plugged and abandoned newfield wildcat, Danna 1, as a dry well on 14 October 2008. The well was drilled to a TD of 2,999m, and failed to encounter any form of hydrocarbon. The well was spudded on 8 September 2008 in the water depth of 109m, using the "Naga 1" S/S. The well was targeting the Lower Miocene sandstone in a structure northwest of the Yetagun gas and condensate field.
Yetagun 1 (Petronas 40,91%, Myanma O&G Enterprise 20,45%, Nippon Oil Explo. 19,32%, PTTEP 19,32%) in M-14 block,  P&A, results unreported.