Gobe

Project Overview

Click here to view photos of Gobe and SE Gobe

The Gobe Oil Project comprises two producing oil fields, namely the South East (SE) Gobe oil field and the Gobe Main oil field. SE Gobe was discovered in early 1991. The SE Gobe discovery was significant because for the first time commercial quantities of oil in the Iagifu sandstone were found. Prior to this the majority of oil had been discovered in the Toro sandstone. The Gobe Main field was discovered in December 1993 and is located 5 kilometres to the north west of the SE Gobe field. Gobe Main also contains its oil reserves in the Iagifu sandstone. In December 2001, the Saunders field was discovered in PDL-4.

The Gobe Main field is wholly located within Petroleum Development Licence 4 (PDL-4), while SE Gobe straddles the boundary of PDL-4 and adjoining PDL-3. Originally, 55% of SE Gobe oil reserves were attributed to PDL-4 and the balance to PDL-3. A re-determination, effective from June 2001, revised the oil split to 59% in PDL-3 and 41% in PDL-4.

Oil is exported via an 8 kilometre pipeline which joins the Gobe Processing Facility to the Kutubu Export Pipeline and marine loading terminal in the Gulf of Papua. The Gobe Project pays a tariff to the PDL-2 and PL-2 participants for the use of the export pipeline and infrastructure. The construction of infrastructure and production facilities for the Gobe Oil Project was completed in early 1998 and the first crude oil flowed from the Gobe Main field in March 1998 and from the SE Gobe field in April 1998.

Production peaked in December 1998 at 18,500 bopd from SE Gobe and at 20,000 bopd from Gobe Main in September 1999.  In early 2005, the SE Gobe 11 well discovered an oil column in an undrained area of the SE Gobe field, located between Saunders and SE Gobe.  An appraisal/development programme took place during 2006 to exploit this area.  Both fields are now in their decline phase, but active well management and facility optimisation is ongoing, to mitigate the fields' natural decline rates.

Oil reserves

As at 31 December 2007, the Gobe project had produced a total of 63.0 million barrels and the gross proved plus probable ultimate recovery estimated by independent experts Netherland Sewell and Associates (NSA) was 28.2 million barrels and 43.5 million barrels for Gobe Main and SE Gobe fields respectively, with 2.1 and 6.6 million barrels respectively remaining. The reserves are contained within generally high permeability oil rims in the lower and upper Iagifu sandstones. As at 31 December 2007, Oil Search’s share of remaining recoverable 2P reserves in the Gobe Project was 1.9 million barrels.

Marketing

The Gobe project crude oil is a light, sweet 45 degree API oil and is sold as part of the “Kutubu Blend” together with Moran and Kutubu crudes.

Recent performance

Gobe Main (production net to OSH)

SE Gobe (production net to OSH)

Latest quarterly report

Oil Search’s share of production from the Gobe fields in the first quarter of 2008 was 0.15 million barrels, 8% lower than in the December quarter, reflecting natural field decline. The gross average production rate for Gobe Main was 18% lower than the fourth quarter at 1,897 bopd, while the average daily production for SE Gobe was 5,913 bopd, a decrease of 5% from the previous quarter.

In the SE Gobe field, production rates in key producers SEG 6 ST1, SEG 11 and SEG 12 were maintained by sustained water injection in SEG 13 ST1. A work programme to test the potential of unperforated reservoir intervals in three Gobe Main wells is expected to commence in the second quarter, following the success of a similar programme in 2007.