Identifying False Positive SCVF in Onshore CSG Wells

Rogue Methane Bubbles in Water
+ about the project

Qteq deployed Ventbuster® units to conduct point-source emissions monitoring, capturing wellhead annulus flow data and shut-in pressure. The system accurately measured ultra-low flow rates (0.04 ml/min, ‘One Bubble in 10 mins’) while accommodating high dynamic ranges up to 720 m³ per day. Gas samples from each well were collected for laboratory analysis to determine composition.

During testing, Ventbuster® confirmed that pressure fluctuations in three wells were solely due to atmospheric variations, with no evidence of gas migration to the surface.

+ summary facts
Location
Australia
Application
False Positive Methane Leak Detection
+ Challenges

Six wells exhibited sustained pressure in the A or B annulus, raising concerns about potential gas migration.

+ Objectives
+ results
  • By eliminating false positives commonly associated with traditional bubble tests, the Ventbuster® system enabled the operator to prioritise well interventions effectively.
  • Data confirming no gas migration was used as scientific evidence to support well decommissioning and restoration planning, avoiding unnecessary re-entry and reducing project costs.

Value to Client

The Ventbuster® system provided definitive evidence to distinguish genuine gas migration from false positives caused by atmospheric fluctuations. This allowed the operator to confidently decommission wells without unnecessary intervention, reducing costs and operational delays. By eliminating reliance on traditional, less rigorous bubble tests, the client avoided costly re-entry and extended monitoring of wells that did not require further remediation. Additionally, Ventbuster®’s real-time digital data enabled informed decision-making, ensuring compliance with regulatory standards while optimising resource allocation.

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