Here's a little info if anyone cares.

September 5, 2007

On July 31, 2007, Sweetpea Petroleum Pty Ltd. commenced drilling the Sweetpea Shenandoah #1 well in the central portion of the Beetaloo Basin, approximately 28 miles southeast of the town of Daly Waters in the Northern Territory of Australia. The well is currently drilling at 4550 feet (1387 m) with a planned total depth of 9500 feet (2896 m). This well is a twin to the Balmain #1 well drilled in 1992.

The original plan to drill the Shenandoah #1 underbalanced with air was modified due to a shallow sand that produced water. The well is now being drilled with air along with water and mud. Oil and gas hydrocarbon shows in the Hayfield Formation and Kyalla Shale have been confirmed. The mudlog exhibits gas shows and fluorescence starting at about 1900 feet, in the Hayfield Formation, and continuing through to present depth of 4550 feet. So far, over 700 feet of hydrocarbon shows [C1-C4] have been encountered. Geologically, the Shenandoah #1 has matched its prognosis and the drilling results correlate excellently with the Balmain #1 well.

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Air Drilling

A drilling technique whereby gases (typically compressed air or nitrogen) are used to cool the drill bit and lift cuttings out of the wellbore, instead of the more conventional use of liquids. The advantages of air drilling are that it is usually much faster than drilling with liquids and it may eliminate lost circulation problems. The disadvantages are the inability to control the influx of formation fluid into the wellbore and the destabilization of the borehole wall in the absence of the wellbore pressure typically provided by liquids.