Interra to spud first well in Indonesia’s Central Kalimantan

Interra Resources Ltd., Singapore, commenced drilling its first onshore well in Kuala Pambuang, southern Central Kalimantan in Indonesia, following the successful completion of feasibility and technical data studies.

The KP-1 well will be drilled vertically to 1,100 m with a hired rig where data points to expected intersections with prospective oil reservoirs.

Interest in the block arose from contemporaneous drilling and production reports that there were numerous oil-producing wells in the area operated by a Royal Dutch Shell PLC subsidiary prior to World War II. Data showed three prospective oil reservoirs—one shallow clastic sandstone (Warukin formation) and two deeper limestones (upper and lower Berai formation). The lower Berai formation had the highest oil influx rate both in testing and subsequent production and is the company’s primary target. The Berai formation potential reservoirs correlate with more recent wells drilled in 1971 some 200 km east of the drill site.

Studies using 300 m of high-quality 2D seismic data indicate potential oil reservoirs at depths of 900-1,100 m below the surface. The data contain anomalies consistent with the limestone reservoirs reported in Shell’s wells. Based on the new data, these are interpreted to be Berai limestone reefs with drape structures over them.

Interra holds 67.5% interest in the exploration and operating rights to the Kuala Pambuang block, The production-sharing contract with SKK Migas was granted in December 2011 with an initial exploration term of 6 years. It was subsequently extended for a further period of 4 years over an area of 1,631 sq km.