Australia: Western Gas Finds Drilling Partner for Sasanof-1 Offshore Well

Australian oil and gas company Western Gas, the operator of the offshore Exploration Permit WA-519-P in W. Australia, has found a partner to fund part of the drilling costs for the Sasanof-1 offshore exploration well.

The partner is the ASX-listed Global Oil and Gas Limited.  Global Oil and Gas Limited will fund 50% of the drilling costs for the Sasanof-1 exploration well. 

The Sasanof-1 exploration well is in WA-519-P in Commonwealth waters about 207 km northwest of Onslow, Western Australia, and is scheduled to drill in Q1 2022. 

Independent assessment by ERC Equipoise Ltd (ERCE) of the Sasanof Prospect estimates a 2U Prospective Resource of 7.2 Tcf gas and 176 Million bbls condensate (P501), with a 32% Chance of Success. The high case 3U Prospective Resource estimate is for 17.8 Tcf gas and 449 Million bbls condensate (P10). 

The agreement will see GLV fund 50% of the cost of drilling the Sasanof-1 exploration well through a 25% acquisition of Western Gas (519 P) Pty Ltd, the licence holder for WA-519-P. 

The Sasanof Prospect is on trend and updip of the Mentorc gas and condensate field and nearby the giant gas fields of Scarborough and Io-Jansz in the Carnarvon Basin. The liquids rich, low C02 Mentorc Field is the eastern fault block and is “filled to spill” into the updip Sasanof Prospect to the west.Sasanof - Credit: Western Gas

Western Gas has secured the Valaris MS-1 semi-submersible drilling rig to drill the well.

According to Western Gas, drilling will start at the earliest in mid-February 2022, subject to approvals, with an estimated total campaign duration of 25 days. Western Gas has contracted specialist well engineering and drilling management company AGR Australia (AGR) to manage the Sasanof drilling campaign.

"Sasanof-1 will be a vertical well and drilled to a total depth of approximately 2500 m in 1070 m of water, providing a low-cost, high-impact exploration activity in a known and proven hydrocarbon province. Drilling costs are estimated at US$20 million," Western Gas said.

“We are delighted to have GLV on board to support this important drilling campaign that, on success, has the potential to be a game changer for the North West Shelf at a time of declining production and expected gas shortages.”

"A discovery of the estimated size of Sasanof will provide multiple gas supply opportunities, including domestic gas, LNG backfill and expansion, and new value-adding industries.”

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