What the Suttles Completion Operations and 64-Stage Frac Programme Mean for Brookside Energy

Sonal Goyal

29 September 2026 10:51 PM AEST

What the Suttles Completion Operations and 64-Stage Frac Programme Mean for Brookside Energy

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Brookside Energy Limited (ASX:BRK) announced on 24 September 2026 that completion operations are underway on both the Sabres 21-1S-3W SXH1 and Whalers 2-1-1S-3W WXH2 wells at the Suttles Pad in Oklahoma's Anadarko Basin. Both wells have been drilled and cased. The frac spread and associated equipment have been mobilised, water handling and surface systems commissioned, and high-pressure frac lines successfully tested. Stimulation is now underway with a total of 64 stages planned across the two wells in a continuous zipper-frac programme. Production facilities are being readied in parallel ahead of first sales.

Completion Operations Detail

The Sabres well targets the Sycamore Formation and the Whalers well targets the Woodford Formation — two primary tight oil and gas producing horizons in the Anadarko Basin. The two wells are being completed using a continuous zipper-frac program, alternating between wells as the team works through 64 planned stimulation stages across both laterals. Following stimulation, the wells will progress through drill-out and clean-up operations before commencing flowback. Production facilities are being readied in parallel ahead of first sales. Brookside holds approximately 70% working interest in the Suttles development.

Suttles Development Context

Suttles is located within Brookside's SWISH (South West Improved Shale Holdings) Area of Interest in Oklahoma. The commencement of completion operations follows successful drilling and casing of both wells, marking the final major development phase before the wells are brought into production. Managing Director and CEO David Prentice emphasised the team's focus on executing the programme safely and efficiently, getting every planned stage delivered as designed, and then moving through clean-out and flowback to bring both wells online.

About the Company

Brookside Energy Limited is an ASX-listed oil and gas company focused on developing operated positions in Oklahoma's Anadarko Basin, targeting the Sycamore and Woodford formations within its SWISH Area of Interest. The company holds high working interests in its operated wells to maximise control over drilling, completion, and production decisions. Brookside is also listed on the OTC Pink market in the US as RDFEF.

Risks

Frac programme execution can be affected by mechanical issues, weather, or equipment availability, potentially delaying completion and flowback.

Initial production rates are variable in the Anadarko Basin. The actual productivity of Sabres and Whalers will not be known until flowback data is available.

US oil and gas Commodity prices will determine the economic outcome — both Oklahoma crude and Natural Gas prices are subject to market movements.

Brookside's approximately 70% working interest means it bears the majority of completion costs for the Suttles programme.

Production Facility readiness in parallel introduces scheduling risk — any facility delay could defer first sales even after successful completion.

What to Watch Ahead

Announcement that all 64 stimulation stages have been completed across Sabres and Whalers.

Flowback commencement and initial production rates from both wells — the first performance data from this development.

First sales from the Suttles wells, representing the start of new Revenue generation from this pad.

Any additional well proposals within the SWISH Area of Interest building on the Suttles completion.

Quarterly production reports providing total SWISH production rates and the Suttles contribution.

FAQs

Q: What is a zipper-frac and why is it used for these two wells?

A: A zipper-frac is a hydraulic fracturing technique where two parallel horizontal wells are stimulated alternately — fracturing a stage in one well, then switching to the adjacent well, then back. This creates complex fracture networks between the two wells, maximising reservoir contact and improving recovery efficiency compared to fracturing each well sequentially. It also reduces overall stimulation time by keeping the frac equipment continuously working between the two wells rather than moving and resetting.

Q: What are the Sycamore and Woodford formations in Oklahoma?

A: The Sycamore and Woodford are two of the primary tight hydrocarbon-bearing formations in Oklahoma's Anadarko Basin. The Woodford Shale is a prolific source and reservoir rock (both generating hydrocarbons and, with stimulation, producing them) widely developed across the Anadarko Basin. The Sycamore is a carbonate formation that sits above the Woodford and has proven productive in the SWISH area. Brookside targets both formations from its multi-bench well programme to maximise resource recovery per pad.

Q: What does '70% working interest' mean for Brookside?

A: Working interest (WI) is the ownership share in an oil and gas well that entitles the holder to their proportionate share of production revenues but also obligates them to pay their proportionate share of costs — drilling, completion, and operating. At 70% WI, Brookside receives 70% of production revenues from Suttles and also pays 70% of the costs. The high WI reflects Brookside's strategy of maximising its economic exposure to wells it operates in the SWISH area.

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