Exploration • Drilling • Field Services
reservoir. Te DST produced a flow rate of approximately 4300 bopd through a 44/64” choke with a gas/oil ratio of 1040 standard ft3
per barrel.
Te main flow of the reservoir was stable over 24 hours and the pressure build-up lasted 36 hours and did not show any barriers such as faults or significant reservoir characteristics variations. Tis is the first successful test of Permian carbonates reservoirs on the Norwegian shelf. Te DST result has confirmed good production
properties of the reservoir. Te preliminary evaluation of the gross recoverable oil and gas resources from the Gohta discovery is estimated at between 105 and 235 million boe of which the oil resources are between 60 and 145 million barrels and the gas resources are between 275 and 545 billion ft3
of gas.
In Turkey, TransAtlantic Petroleum has announced that it expects its 2013 year-end exit rate to top 5,000 boed. Te company currently has three active rigs in south eastern Turkey and two active rigs in the Trace Basin in north western Turkey. TransAtlantic says it expects to add one drilling rig in Bulgaria and release one drilling rig in the Trace Basin in Turkey to maintain a five rig operation going forward. TransAtlantic recently drilled a horizontal well
in the Şelmo field (100 per cent working interest) in south eastern Turkey targeting the maximum stratigraphic depth (MSD) zone at a depth of approximately 5,200 feet. Te company is currently drilling a second horizontal MSD well, with up to another five in planning.
Also in south eastern Turkey, the company recently drilled the Göksu-5H horizontal well (100 per cent working interest) to the Mardin zone at a total measured depth of 5400 feet. A further two exploration wells are being drilled
in the Molla area. Te Tepe-1 (100 per cent working interest) has a targeted depth of 9500 feet in the Mardin and Bedinan formations on an exploration license the company acquired in May 2013. Te Ambarcik-2 (50 per cent working interest) has a planned total depth of 9750 feet targeting the Bedinan formation in the Arpatepe license. Te company planned to drill at least one vertical well in the Arpatepe field (50 per cent interest) before the end of 2013. In the Far East, Petrogas subsidiaries Petrogas
Island and RHP Salawati Island have commenced drilling at the Zircon-1 exploration well in the offshore area of the Salawati Kepala Burung production sharing contract, West Papua. Located in water depth of 32 metres, the well is planned to reach a total vertical measured depth of 1205 metres. It is the first of a multi-well high impact drilling programme to be drilled in this offshore area. Te Zircon prospect was high-graded for drilling after the company conducted a 450 km2 3D seismic survey in 2010. Zircon-1 is located 4.3km south west of the Koi-
1 discovery. Koi-1 was drilled in 2000 and the well flowed 980 boe/day and 2.7 million standard ft3
of gas through a drill stem test from the Miocene Kais limestone. ●
Baker Hughes extends cutter life and bit runs B
aker Hughes has launched the StayCool multidimensional cutter which helps operators drill to total depth faster and more cost effectively by extending cutter life and footage per run. Used exclusively on the Hughes Christensen Talon platform of premium polycrystalline diamond compact bits, these cutters incorporate a contoured diamond table, wear- resistant diamond materials, and new interface designs. “Historically, operators would design more cutters into a bit to compensate for cutter wear or damaged cutters, which isn’t always the most efficient way to drill,” said Scott Donald, vice president of drill bits for
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Baker Hughes. “Te StayCool cutter allows us to offer a bit that maintains the same cutter density but can perform better when cutters are worn.” In challenging environments such as interbedded sandstones and carbonates, bit performance is directly related to cutters and their ability to withstand heat. Overheated cutters experience
abrasive wear faster, which can lead to lower rates of penetration (ROP) and higher mechanical specific energy (MSE) or wasted energy that is not directly transferred into removing rock. In the Cana Woodford field of
Oklahoma, this technology provided /day
customers with a 10 per cent improvement in ROP and a 37 per cent improvement in footage when drilling through hard sands interbedded with hard limestones. In the Pinedale anticline of
Southwestern Wyoming, StayCool cutters are being used to drill through abrasive sandstones interbedded with shale. In this area, the Talon bit with StayCool cutters has improved the distance drilled by 12 per cent in 50 runs totalling 156,000 ft. StayCool cutters have already drilled more than 289,000ft in 89 runs, in five different applications in field tests, and for more than 20 customers throughout the USA. ●
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