From open pathway to engineered barrier.
Plugging changes the physical system. Measurement establishes whether the change produced the claimed methane result.
Methane may move through the wellbore, compromised casing, annular space, or connected surface equipment. Emissions can be intermittent and variable.
Engineered cement barriers isolate the hydrocarbon-bearing formation, the casing is cut below grade, and the surface is restored. Post-plug measurement establishes what changed.
Target. Measure. Plug. Verify. Monitor.
Each step narrows uncertainty. None can substitute for another.
Start where the methane is.
Screen marginal, idle, and legacy wells for abnormal emissions. Confirm the source, the legal right to intervene, and whether continued operation is economically plausible.
A ranked, eligible well set—not a random inventory.
Establish the baseline before anything changes.
Quantify emission rate at the wellhead and across connected equipment, repeat the measurement to test persistence, and attribute the source. Uncertainty is quantified rather than assumed away, and the lowest defensible forward case is carried into the baseline.
- Repeat direct measurement across separate site visits
- Source attribution against tanks, pneumatics, and nearby wells
- Gas composition and isotope analysis where available
- Documented instrument, method version, and chain of custody
A conservative, uncertainty-bounded emissions baseline tied to a specific wellbore.
Remove the pathway, not just the equipment.
Set cement barriers across the hydrocarbon-bearing formation and any shallow groundwater interval, cut and cap the casing below grade, remove surface infrastructure, and restore the site to the standard the state and the landowner require.
- Well engineering programme reviewed before mobilisation
- Barrier placement and cement volumes logged against plan
- Regulatory closure filing with the lead state agency
- Surface remediation and landowner sign-off
A permanently secured wellbore and a complete, auditable closure record.
No party marks its own work.
Post-plug measurement is taken under the same protocol as the baseline. An accredited third party reviews eligibility, additionality evidence, baseline construction, execution records, and the post-closure result before any claim advances.
- Post-plug measurement under the baseline protocol
- Independent review of method, data, and calculation
- Verifier appointed outside the commercial entity
- Findings and exceptions recorded in full
A verified emissions-avoidance assertion with a documented assurance opinion.
Permanence is a schedule, not an assumption.
Closed wells re-enter a surveillance programme on a defined cadence. Exceptions are reported rather than absorbed, a reserve is held against reversal, and a funded correction protocol governs what happens if performance changes.
- Scheduled re-survey of closed wells
- Transparent exception reporting
- Reserve holdback against reversal
- Defined, funded correction protocol
A live surveillance record and a funded remedy if a closed well changes behaviour.
The atmosphere responds to what stops.
Find the source. Close the pathway.
Preserve the evidence. Return the land.