STAVANGER -- StatoilHydro has hit pay with wildcat well 16/2-5 in the North Sea. The well, which proved oil and gas, is located 35 km (22 mi) east of the Gudrun field and approx. 30 km (192 mi) south of the Grane field in the North Sea.
In 2007, appraisal well 16/2-4, drilled about 6.5 km (4 mi) north of 16/2-5, proved gas in the bedrock and oil in Late Cretaceous reservoir rocks (the Ekofisk and Tor formations).
The purpose of well 16/2-5 was to prove petroleum in Jurassic reservoir rocks, alternatively in bedrock, if no Jurassic reservoir rocks were present. The well proved oil and gas with associated condensate in reservoir rocks interpreted as being from the Jurassic Age, or older rocks from the Triassic/Permian, the company says.
The reservoir consists of sandy conglomerate. The gas discovery in the well is probably part of the same hydrocarbon system found in the bedrock in 16/2-4. Preliminary estimates of the size of these gas discoveries indicate from 3 to 10 bcm of recoverable gas.
A successful formation test was carried out in the gas zone. The maximum production rate was 120,000 cm/d of gas through a 63/64-in. nozzle opening. Limited flow properties were proven in the oil zone.
Extensive data collection and sampling were also carried out in the well. Several studies have been initiated to evaluate the well data. The results of these studies, new interpretations of seismic data, and improved understanding of the connection with the gas discovery in 16/2-4 are necessary in order to evaluate the resources and to determine further activity, StatoilHydro says.
The jackupWest Epsilon drilled the well to a vertical depth of 2,324 m (708 ft) below the sea surface. The well was concluded in bedrock and will now be permanently plugged and abandoned.