Release: Cooper Energy: Kurnia-1 logging results

(12 September 2007)--The logging of the drilled section between 1,237 metres (20” casing shoe) and 2,141 metres has been completed.

 

The wireline logs confirm the presence of three sandstone formations in the location where good oil and gas shows were demonstrated whilst drilling. The sandstone formations are confirmed over the following intervals:

1,262.5 – 1,264 metres

1,292 – 1,300 metres

1,785 – 1,790 metres

 

Wireline logs have not been definitive in determining the presence of hydrocarbons in these formations and attempts to obtain formation pressures and samples were unsuccessful.

 

At this time it is prognosed that hydrocarbon saturations cannot be accurately determined due to the effects of drilling mud filtrate invading the formations and lost circulation material (LCM) plugging the formations. The well experienced mud losses whilst drilling and LCM was required to control those mud losses. The invasion of mud filtrate into formations tends to flush hydrocarbons away from the near wellbore thereby making log identification of those hydrocarbons difficult.

 

The subsequent use of LCM to cure these losses creates a screen of fine material across these formations that may have affected the ability to measure pressures and take samples from these formations.

 

The lower sandstone formation (1,785–1,790 metres) caused an influx of gas into the wellbore and therefore moveable hydrocarbons should be present at least in the lower formation, which was subsequently brought under control using LCM.

 

The forward plan is to drill ahead to the casing point at 2,500m, log the lower interval from 2,141-2,500 metres, set 13-3/8” casing then drill ahead to the Kujung oil primary objective. A decision to production test the lower sandstone formation will be made after the well has penetrated the Kujung oil primary objective. (end of release)