Highlights

  • Well 3.5B at Botala's Serowe project flows gas earlier than expected during dewatering.
  • Water levels at first gas flow were far higher than the company's planned threshold.
  • Dewatering has been deliberately slowed to protect the stimulated reservoir.
  • The project targets commercial output against a 7.1 trillion cubic foot resource base.

Botala Energy (ASX:BTE) has reported an early milestone at its Serowe Coal Bed Methane Project in Botswana, with well 3.5B demonstrating continuous gas flow substantially earlier in the dewatering process than the company had anticipated. The result marks the first continuous gas flare recorded at the well and provides an early indication of how the reservoir is responding to the stimulation treatment applied ahead of production testing.

Coal bed methane wells typically need to be dewatered before gas can flow to surface, since the Natural Gas is held within the coal seam under pressure exerted by groundwater. As water is pumped out and pressure within the seam falls, gas is progressively released and begins to flow toward the wellbore. The timing and behaviour of this dewatering process is closely monitored, since gas appearing earlier than expected, and at a higher water level than planned, can indicate the reservoir is responding more favourably to the stimulation work carried out before testing began. Because coal seam gas wells can take weeks or months to fully dewater before reaching stable production rates, operators typically track indicators such as water level, water production rate and the timing of first gas closely, using them to assess how a well is likely to perform once it reaches steady production. Early signals during this phase, whether favourable or otherwise, can help an operator refine its expectations for a well and adjust the pace of surrounding development activity accordingly.

Well Performance During Dewatering

Well 3.5B sustained gas flow for more than 30 hours beginning on 20 and 21 September 2026. Gas began flowing when water levels within the well remained approximately 60 metres above the coal seam, significantly higher than the 20-metre threshold the company had expected to reach before gas flow would commence. Chief Executive Officer Kris Martinick said, "To see gas flowing this early and the water level still high above the coal, it tells us the well is performing better than we planned."

Water production from well 3.5B substantially exceeded that recorded from surrounding unstimulated wells in the same area, a comparison the company said suggests the stimulation treatment applied to 3.5B successfully opened additional natural pathways within the coal seam. Stimulation treatments in coal seam gas development are designed to create or widen fracture networks within the coal, improving the rate at which water and, subsequently, gas can move through the seam and into the wellbore. A higher rate of water production than seen in nearby unstimulated wells is one of the indicators operators look for when assessing whether a stimulation treatment has achieved its intended effect on the surrounding coal, since it points to an enlarged network of pathways through which fluid, and eventually gas, can travel toward the well.

Managing the Dewatering Process

In response to the well's performance, Botala said it had intentionally slowed the rate of dewatering to between three and five metres per day. Slowing the drawdown rate is intended to protect the stimulated reservoir from damage while allowing the company to monitor the progressive release of gas as water levels continue to fall. A controlled dewatering rate reduces the risk of damaging the near-wellbore reservoir through overly rapid pressure changes, which can compromise the long-term productivity of a coal seam gas well if not carefully managed.

The company's early observations at well 3.5B, including the higher-than-expected water level at first gas and the elevated water production relative to unstimulated wells nearby, are being used to inform how the broader Serowe project is developed as further wells move through the dewatering process. Applying learnings from an individual well's dewatering behaviour to the design and management of subsequent wells is a routine part of coal seam gas field development, allowing an operator to refine drawdown rates and monitoring protocols as more wells across a project area move through their own dewatering timelines.

Commercial Targets and Project Scale

Botala Energy said its objective is to establish commercial production capacity from the project, targeting more than 70 gigajoules of gas per day. A gigajoule is a standard unit used to measure the energy content of natural gas, and daily production figures expressed in gigajoules give an indication of the scale of gas Supply a project could ultimately support for commercial customers.

The broader Serowe Coal Bed Methane Project holds an estimated prospective resource of 7.1 trillion cubic feet of gas. A prospective resource describes an estimated quantity of gas that may be recoverable from undiscovered or untested accumulations, based on geological and engineering data, and is distinct from resource categories that have already been confirmed through extensive testing and production history. The results at well 3.5B form part of the company's ongoing efforts to characterise how this resource base behaves during dewatering and early production testing. Converting a prospective resource of this scale into a commercially producing gas field typically involves progressing through successive stages of appraisal, including pilot wells such as those in the Pitse Pilot program, before a project can move toward broader field development and sustained commercial supply.

Key Insights

The early and higher-than-expected gas flow from well 3.5B provides Botala Energy with an initial data point on how the stimulation treatment applied to the well has affected the surrounding coal seam, with elevated water production relative to unstimulated wells cited as supporting evidence of improved pathways within the reservoir. The company's decision to slow the dewatering rate reflects a cautious approach intended to protect the stimulated zone while further data is gathered. These early results sit within the context of a project targeting more than 70 gigajoules of daily production against a prospective resource estimated at 7.1 trillion cubic feet, meaning the current dewatering results represent an early stage in a longer process of testing and development toward that commercial target.