Work on CLS-1TW well. Image courtesy of IEV Holdings.

Work on CLS-1TW well. Image courtesy of IEV Holdings.

HYDROCARBON intervals have been identified in wells drilled by IEV Holdings in the Parigi and upper Cibulakan formations in the CLS-1TW development well in Cilamaya structure, onshore West Java.

Drilled to a total depth of 2,117 metres, the company said hydrocarbon bearing intervals have been identified based on results from mud logs during drilling and a preliminary interpretation of a full suite of electric wireline logs.

Several depth intervals have been identified for production testing and the well encountered gas shows within the Parigi formation, IEV said.

The company said this was the first occasion that the Parigi formation has confirmed good gas responses in the Cilamaya structure.

IEV said many of the intervals showed high total gas unit counts and high methane readings during chromatography of mud returns and the electric wireline logs demonstrated density-neutron crossovers, interpreted as indications of gas bearing intervals.

The well recorded oil shows in the upper Cibulakan formation, the company said.

IEV said only selected zones will be production tested due to the limitation in available perforating explosives as the well was originally planned for only two intervals.

The production testing will involve flow testing and pressure build-ups to determine reservoir flow capacity and well deliverability, leading to updates in the quantification of reserves and resources in the Cilamaya and neighbouring Pabuaran structures, the company said.

Test results will be announced when the production testing program is completed, which is expected to be within the next 30 days, the company said in a statement on 12 March.

Following the completion of the production testing, IEV said it plans to commence production of the crude oil from CLS-1TW Z16 upper Cibulakan formation intervals, which will be delivered to the sale point at the Pertamina refinery in Cirebon.