Hoang Long Joint Operating Co (HLJOC) has completed the appraisal well Te Giac Trang 15X (16-1-TGT-15X) at Te Giac Trang (White Rhinoceros) field in Block 16-1, Cuu Long Basin, around early April 2020. The well, spudded around mid January 2020, was drilled to a TD of 4,906 m using the Borr Drilling "Idun" J/U. It targeted the Lower Miocene Bach Ho clastic and Lower to Upper Oligocene 'D and E' sequence at H 1.2 fault block.   The main reservoir intervals were fracked and completed as dual producers. Operations are expected to be completed in Q2 2020. Production performance test at the deeper Oligocene 'D and E' sequences to access its recovery factor and the commerciality of the new play for the field. Test result has not been released.   An injector well, 16-1-TGT-H5-32I was drilled from H5-WHP by Borr Drilling "Idun" J/U between November and December 2019. It was completed as a producer well but will be converted to a water injector at later date.   The last development drilling campaign at Te Giac Trang was in 2018 and it consisted of three wells (two infill and one re-entry), drilled using two separate rigs, âPV Drilling Iâ J/U (16-1-TGT-H1-16AP) and Japan Drillingâs âHakuryu-11â J/U (16-1-TGT-H5-31P and 16-1-TGT-14XST3). All wells were completed and put on production.  The Te Giac Trang field produced approximately 16,000 bo/d and 12 MMscf/d from 28 producers in 2019.   The Te Giac Trang field was first discovered in 2003. First oil production from the field commenced on 22 August 2011.  Block 16-1 is operated by Hoang Long Joint Operating Company (HLJOC). Interest in the block is held by PetroVietnam Exploration Production Corp (41%), PTTEP Hoang Long Co Ltd (28.5%), SOCO Vietnam Ltd (28.5%) and OPECO Vietnam Ltd (2%).  Background Information  As of end November 2019, a total of 53 wells were drilled in Te Giac Trang field: 1 new-field wildcat, 18 outpost wells, 28 producer wells and 1 injector wells.  The 2018 development drilling campaign was carried out between late August 2018 and February 2019. The campaign consisted of three wells (two infill and one re-entry) drilled using two separate rigs, PV Drilling Iâ J/U (16-1-TGT-H1-16AP) and Japan Drillingâs âHakuryu-11â J/U (16-1-TGT-H5 31P and 16-1-TGT-14XST3). All wells were completed and put on production.  The 2016/2017 development drilling campaign was completed on or around 10 July 2017 with a total of five wells drilled (16-1-TGT-H4 27P, 16-1-TGT-H4 28P, 16-1-TGT-H5 29P, 16-1-TGT-H1 30P and 16-1-TGT 14X/XST1/XST2). 16-1-TGT-14X was initially planned for 2014/2015 drilling campaign but was postponed due to time limitation. The remaining four wells were completed as producer wells and have commenced production.  The Te Giac Trang Full Development Plan (FFDP) was submitted to relevant authorities in Q4 2016 and was formally approved by the Government of Vietnam on 9 February 2017. The FFDP includes up to 18 additional wells and a new processing equipment (water handling) to be installed on the H1-WHP. The processing equipment is designed to handle 90,000 bo/d with specific handling capacity of up to 65,000 bw/d. The installation of new processing equipment was completed in mid Q4 2017.   A three-wells appraisal campaign was plan for 2014/2015 drilling campaign. Due to limited time, only two wells were drilled 16-1-TGT 9X/ST1 and 16-1-TGT 12/ST1). The wells were drilled using the Ensco âEnsco 109â J/U (16-1-TGT 9X/ST1) and UMW âNaga 2â J/U (16-1-TGT 12/ST1) to appraise the Miocene and Oligocene sandstone C and D sequences in different fault blocks. 16-1-TGT 14X was carried forward to the next drilling campaign.  The H5-WHP topside was loaded out on 10 July 2015 for installation. First production commenced on 10 August 2015.  The development plan for the H5 fault block was approved on 20 September 2014. The jacket of H5-WHP was installed in early September, followed by the topside and associated pipelines in Q3 2015. Development drilling from H5-WHP commenced on 1 October 2014 in parallel with infill wells drilling from the H4-WHP.   A total of 18 wells have been drilled in the field which includes development, infills, injectors and outpost well between 2013-2015. Following the discovery of 16-1-TGT-10X ST1 (2013), located in the southernmost of H5 fault block, HLJOC planned to install a new wellhead platform in the H5 fault block with production tied-in to the FPSO via H1-WHP (wellhead platform).  Phase 2 development drilling commenced in early October 2011 with 5 wells drilled from H4-WHP and early July 2012 with 4 wells from H1-WHP. Production from H4 platform commenced on 6 July 2012.  Production from the Te Giac Trang field commenced on 22 August 2011 from the H1 wellhead platform at an initial rate of 15,000 bo/d. The field was expected to plateau at 55,000 bo/d and 30 MMscfg/d from eight wells for the first phase of development. Crude oil is sent via a subsea pipeline to the âArmada TGT 1â FPSO and from there exported via tankers to local refineries. Gas is piped to the nearby Bach Ho facilities and then transported onshore for the domestic market through the existing pipeline system.  The Phase 1 development drilling campaign (8 wells) in the field was completed in March 2011, with the successful completion of the TGT H1-8P well. All wells from the first phase of development drilling were suspended until commencement of Phase 1 production.  The Field Development Plan (FDP) was approved in September 2009. The development plan comprised of a Floating, Production, Storage and Offloading vessel (FPSO), two well head platforms (H1 and H4 WHP) and a subsea pipeline system to transport hydrocarbons, gas export, gas lift and water for injection. The FPSO was scheduled for operation and deliver its 1st oil by June 2011, and was expected to store up to 1 million barrels of crude and process 45,000 bo/d.   In 2006-2007, appraisal wells, 16-1-TGT 2X, 16-1-TGT 3X and 16-1-TGT 4X were drilled to aid the determination of the best location for the initial development and to assess the extent of the TGT Field and the flow patterns and recovery characteristics of the Lower Miocene Bach Ho formations from the different fault blocks. The remaining appraisal wells, 16-1-TGT 5X, 16-1-TGT 6X and 16-1-TGT 7X was suspended as oil and gas producers.  The Te Giac Trang (TGT) field was discovered by HLJOC with 16-1-TGT 1X (Te Giac Trang / White Rhinoceros) (2005), which was spudded on 2 June 2005 using âAtwood Beacon" J/U and was drilled to TD 4,478m MD. The objective of the well was to investigate a subtle three-way dip closure Lower Bach Ho Formation play and an Oligocene D play and targeted a rollover anticline against a fault. The well has flowed 8,566 bo/d of 37 degrees API oil plus 4.86 MMcfg/d on a 80/64" choke, from the section 2,701-2,760m in the Lower Miocene Bach Ho Formation clastics. The deeper Oligocene interval was also tested having exhibited significant oil shows during drilling, but only non-commercial flows were achieved due to formation tightness  In late April 2004, 462 sq km 3D and 82 km 2D tie lines in the survey were acquired using WesternGeco's "Emerald" S/V.  16-1-VV 1X (Voi Trang / Golden Elephant) wildcat was plugged and abandoned on or around 9 May 2003. The well, spudded on 29 March using the "Trident 12" J/U in 35m of water, was drilled to a TD of 3,755m and tested over a Basement interval. This flowed only approximately 10 bbls of oil however and the decision to abandon the well was taken. Oil shows were encountered in the Oligocene, over the sections 2,886-3,363m and 3,404-3,442m, but these were not tested. The well had a PTD of 3,745m to test the fractured Basement play.   Vertical wildcat, 16-1-VT 1X (Voi Trang / White Elephant) (oil discovery) was spudded on 12 October 2002 using the "Trident 12" J/U and was drilled to a TD of 2,490m MD. The well was reported to have tested a maximum sustained rate of 3,500 b/d of 42 API oil from the open hole interval 2,086-2,490m, over both E-sequence Oligocene and Basement sections. The flows are believed however to have come mainly from the Oligocene section with up to 40% water cut. 16-1-VT 2X appraisal well was spudded in 2003. Partner Soco reported that the well was drilled to a TD of 2,530m, including a 268m section in Basement, but failed to encounter commercial quantities of oil. Oil shows were also observed in the Oligocene section (which was thought to have produced most of the flows in discovery well 16-1-VT 1X), but the section was not considered to be well enough developed in the appraisal.   In 2002, the rightholding in Block 16-1 was revised with Amerada Hess exiting the country. The revised holdings in HJLOC are now PetroVietnam 41%, SOCO 28.5%, PTTEP 28.5% and Opeco 2%  HLJOCâs first well, 16-1-NO 1X (Ngua O / Black Horse) wildcat, was spudded on 23 May 2002 using the "Trident 12" J/U, was drilled to a TD of 3,684m including approximately 520m of Basement section. Shows were encountered in the overlying Miocene sandstone objective, but the reservoir characteristics of the interval precluded testing. A single DST was undertaken in the multiply-fractured Basement section over the interval 3,174-3,563m, flowing 250 bo/d during an 18 hour testing interval.  The acquisition of a 640 sq km 3D seismic survey over the BaVi prospect was completed in early October 2000. The survey commenced on 24 July 2000 using Geco Prakla as seismic contractor. The survey was being carried out jointly with adjoining Conoco Block 16-2 under a joint acquisition programme between HLJOC and Conoco using the seismic vessel âGeco Resolutionâ. About 3,400 km of 1978 and 1984 vintage seismic was also being reprocessed.  In 1997, Block 16 was split into Blocks 16-1 and 16-2.   16-BV 1X (Ba Vi 1X), the first well, then Block 16 was drilled by Vietsovpetro in June 1981. The well, located 85km south-east of Vung Tau in 50m water depth was plugged and abandoned as an oil discovery at a TD of 3,463m after having tested 400 bo/d in the Lower Miocene Bach Ho Sandstone Member at a depth between 2,593m and 2,638m. Another test in the Upper Oligocene Tra Tan Formation flowed 120 bo/d. The granite basement was reached at 3,364m with 66m penetrated. Tests in Paleogene and Miocene yielded water with oil and gas shows.
Hoang Long Joint Operating Co (HLJOC) Block 16-1: Te Giac Trang 15X, completed Results Unknown