IHS Markit understands that Pertamina has likely plugged and abandoned wildcat West Mudi A-1 (WMA-1), in the Tuban block, located onshore in the East Java Basin, around early February 2020, as a dry well. WMA-1 was spudded in mid-September 2019 and had a PTD of 2,414 m with drilling operations initially estimated to last around 60 days. The well was likely targeting the Lower Miocene Tuban reef carbonates, with pre-drill resources estimated at 18.37 MMbo.    Drilling was conducted by Pertamina Drilling Services Indonesia (PDSI) using a 1500 HP land rig. The operator reported an investment of approximately USD 10 million for this well.  According to Pertamina, drilling of WMA-1 commenced one year earlier than planned, to accelerate the search for additional oil and gas resources in the block. The company also commenced a 227 sq km 3D seismic acquisition in the block at the end of August 2019. Both activities are likely part of the companyâs firm commitments under the new gross split contract that was officially awarded on 20 May 2018.  Pertamina held a socialization event for the planned drilling activity in early May 2019. Reportedly the event received full support from local residents as well as district government. Separately, the company also held another social event with the district government and local residents, for the 3D seismic survey around mid-June 2019.  The current Tuban block consists of East Tuban and West Tuban blocks. The operator hopes to find new prospects with the new seismic data and hence increase the chance of adding new reserves to the block.  Pertamina Hulu Energi Tuban East Java is the current operator holding 100% ownership in the block.  Background Information  The Tuban block was previously under a joint operating contract between Pertamina and PetroChina, The contract was expired on 28 February 2018. Pertamina has been assigned 100% in block after the expiry of the previous contract that ran under the cost recovery scheme.  The last exploration drilling in the block was the Karang Mudi 1 wildcat, spudded in December 2014 under the Tuban JOA, operated by PT Pertamina/PetroChina JOB. Situated approximately 1.5 km North-Northeast of Mudi 1 wildcat, Karang Mudi 1 was targeting the carbonate of Tuban Formation and the Lower Miocene Kujung Formation. The exploration campaign was intended to find additional reserves for the block as the operator was targeting oil production at around 40,000bo/d in 2014. The well was completed in October 2015 with results unreported.  The operator was planning to run a 100 sq km 3D seismic survey in the block in 2015. The survey was intended to enhance operatorâs understanding on the detailed subsurface condition of the northern portion of the block, following its successful exploration campaign in the Sumber 1 wildcat. The operator concluded four DSTs operations at the Sumber 1 wildcat in mid-November 2013 which yielded 22 MMcf/d of gas and 550 b/d of oil from DST#4. Encouraging well test result from DST#3, conducted in the lower reservoir, was reported at 6 MMcf/d of gas and 216 b/d of condensate through 32/64â choke. From the previous report, DST#1 was indicating hydrocarbon flow, but no further report released. The operator was conducting DST# 4 in late October 2013 and well-testing operations was commenced in mid-October 2013.   The Sumber 1 wildcat was drilled down to a total depth of 2,365 m on 2 October 2013. The well was spudded using âNYT #03â rig on 12 June 2013. PTD of the well was at 3,048 m, the well is situated on the northern portion of the block, some 22 km north of Mudi field and 14km northeast of Kembang Baru 1 wildcat. It could target the Upper Oligocene to Lower Miocene Kujung Formation and Lower Miocene Tuban reef carbonates and the well was expected to provide additional oil reserves to the block of about 9.5 MMbbl of oil. According to local news report, the operator was planning to spud the well in March 2013 but it did not push through because of land-access issue from the local administration.
West Musi A-1 nfw. committed well in Tuban block, P&A believed dry, PTD was 2,414m, targets Kujung + Tuban reef fmâs.