Bass Oil Limited is an Australian-listed oil producer that holds a majority interest in eight permits in the Cooper Basin (Australia) including
the 100% owned Worrior and Padulla oil fields and a 55% interest in a South Sumatra Basin (Indonesia) KSO. The Company is debt free and
committed to creating value by leveraging the competitive strengths of its team, operating capability, reputation, and relationships in both
Australia and Indonesia.
Highlights
• Worrior 11 workover operations have been successfully completed. The well has
commenced oil production from the McKinlay zone confirming the presence of an
undrained attic
• Field production has subsequently increased and is expected to stabilise at or above 120
bopd up from 95 bopd
• Bass has commenced preparations to add perforations to the well, expected to increase its
productivity and take total field production to 300 bopd, adding 120,000 barrels of
developed reserves
Summary
Bass Oil Limited is pleased to advise that it has successfully completed workover
operations at the Worrior 11 well.
Worrior 11 was reconfigured as a McKinlay zone oil producer to access undrained oil from the highest point
in the field, the attic, (Figure 1 and 2). The well has commenced production and initial results confirm the
presence of an undrained attic in the McKinlay oil reservoir. The field production is currently being optimised
and total production is now up to ~120 bopd.
Initial results have given confidence to perforate an additional higher productivity interval in the McKinlay,
interpreted to still be in the oil column now that the presence of moveable oil has been confirmed. The
perforations can be added through tubing at low cost.
Once the additional perforations are added Worrior 11 is expected to increase Bass’ total Cooper Basin oil
production to 300 bopd at a time of sustained high oil prices. The well is expected to increase developed
reserves by some 120,000 barrels of oil as well as accelerate production of the remaining reserves contained
in the McKinlay reservoir. This project is expected to add materially to the Company’s free cash flow
providing further capital for investment in other growth projects in Bass’ portfolio.
Background
The Worrior 11 well drilled in 2017, was the last drilled in the field. The primary objective of the well was to
provide an additional drainage point for the Birkhead, Hutton and McKinlay reservoirs. The secondary
objective was to provide a future drainage point for the Murta reservoir. The well was drilled directionally to
access the highest point on the Worrior structure located underneath the existing production facilities. It has
only produced from the Birkhead and Hutton zones. The McKinlay reservoir was never completed or
produced in this well and the attic oil remains undrained.
The objective of this workover was to access and drain the remaining McKinlay oil reserves. Following the
additional perforations to be added shortly, the well’s production is expected to increase to 200 bopd and
drain an additional 120,000 barrels of attic oil. The well is also expected to accelerate the production of the
remaining reserves in the McKinlay reservoir.
The oil production from Bass’ Cooper Basin oil fields is expected to increase to approximately 300 bopd up
from the current rates of ~120 bopd. Figure 3 below illustrates the potential increase in the free cash flow
for total field production rates of 300 bopd and 500 bopd. Either of these two cases will provide a material
boost to the company’s revenue and its ability to self-fund development activities thereafter.
Notes on reserves and resources
The reserves and resources information in this release is based on, and fairly represents, information and
supporting documentation reviewed by Mr Tino Guglielmo. Mr Guglielmo is an employee of Bass Oil Limited
and has a Bachelor of Engineering (Mech). He is a member of the Society of Petroleum Engineers (SPE) and a
Fellow of the Institution of Engineers of Australia (FIEAust). He has in excess of 40 years of experience. The
reserves and resources information in this release has been issued with the prior consent of Mr Guglielmo as to
the form and context in which it appears.
This announcement has been authorised for release by the Board of Directors of Bass Oil Limited.