• Workover to restore production from Cliff Head 10 well commences
• Anticipated to increase production by 130 barrels of oil per day 

The Cliff Head Joint Venture (CHJV) provides the following update on its Cliff Head Operations (Cliff Head) in respect to the commencement of the Cliff Head 10 (CH-10) Workover campaign.

The CH-10 well was shut in, September 2021, due to a downhole electrical fault. This well had produced reliably for nearly 12 years with the same Electrical Submersible Pump (ESP) and this performance significantly exceeds the field average of 4 years.

On Thursday, 9 June 2022, activities began on the CH-10 Workover to replace the failed ESP and increase hydrocarbon production from this well. Over the coming months, the CHJV will undertake a phased campaign to recover the failed ESP and replace it with a new ESP. In addition, a deeper water producing reservoir will be isolated, with the aim to increase oil production. The phased approach to this workover optimises the utilisation of the Hydraulic Workover Unit and budget spend in alignment with long lead item delivery schedules.

The CHJV expects the successful workover will produce an additional circa 130 barrels of oil per day (bopd) from CH-10 and see field production return to above 800 bopd.

Triangle Managing Director, Mr Conrad Todd said,
“I am pleased to report to shareholders that The Cliff Head Joint Venture has commenced the CH-10 well workover. This will allow the CHJV to restore the production lost due to failure of the downhole pump and furthermore to increase production by shutting of water from a deeper reservoir.”

Triangle holds 78.75% interest in Cliff Head and is the Operator, with Royal Energy holding an interest of 21.25%.

The Project

The Cliff Head Oil Field (Cliff Head) in located in the Perth Basin about 270 kilometres north of Perth and 12 kilometres off the coast of Dongara in Western Australia. Cliff Head resides in the Production License WA-31-L which covers 72km², and the oil field covers 6km² in the Commonwealth Exploration Permit WA-286-P. Cliff Head is located at a water depth of 15-20 metres.

The Cliff Head facilities are the only offshore and operating onshore infrastructure in the Perth Basin, and therefore, important for any development in the surrounding area.

Oil is produced via five electrical submersible pump production wells, with produced water reinjected into three injection wells at the offshore platform. THe platform is connected to the onshore Arrowsmith Stabilisation Plant by twin 14km production and injection pipelines.

The Crude oil is then trucked to BP at its Kwinana refinery south of Perth. Arrowsmith has a production capacity of 15,000 bopd so has the capacity to service an increase in Reserves as well as third party crude.

Exploration upside includes expected increases in reserves from its already producing reservoirs as well as near-field targets. An Asset Life Extension Program aims to ensure the integrity of Cliff Head’s essential infrastructure and increase Reserves in the field.

KeyFacts Energy: Triangle Energy Australia country profile