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While drilling at a depth of 3,342 metres in sandstones of the Alai formation (a secondary target) there was a strong flow of live oil to the surface accompanied by 33% gas in the drilling mud. After closing of the blowout preventer the well was successfully stabilised and drilling operations have now recommenced.
The oil, which appears to be of medium density, flowed despite drilling with heavy mud (1.57 SG) reflecting a pressure of some 512 atmospheres (7,524 psia) in the reservoir. The primary target for the well is the Paleogene Bukhara limestone formation and it is planned to set casing prior to entering this zone. The well is exploring an attractive salt induced structure and is planned to reach a total depth of some 3,800 metres.
The well is located in the south‐east of Tethys’ Contract area, south of the town of Kulob and only some 10 kilometres north‐west of the Afghan border. The nearest oilfield in that region is the Beshtentak field some 75 km to the north‐west which produces oil from the Bukhara limestone.
Tags: Tethys Petroleum