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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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Toward Multiscale Measurement-Informed Methane Inventories: Reconciling Bottom-Up Site-Level Inventories with

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  • 1Department of Applied Mathematics and Statistics, Colorado School of Mines, Golden, Colorado 80401, United States.

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Summary

Government methane reduction strategies need better site-level inventories. This study used continuous monitoring systems (CMS) to reconcile measurements, improving accuracy for oil and gas emissions.

Keywords:
continuous monitoring systemsmeasurement-informed site-level inventoriesmethane emissionsmultiscale measurementsoil and gas

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Energy Sector Emissions

Background:

  • Current methane emission inventories for the oil and gas sector struggle to account for temporal variability and emission extremes.
  • Government policies and corporate strategies increasingly require accurate, site-level methane emission data.
  • Top-down measurements offer insights but need integration with bottom-up inventory methods.

Purpose of the Study:

  • To demonstrate a method for reconciling continuous monitoring system (CMS) data with top-down measurements and bottom-up inventories at the oil and gas site level.
  • To improve the accuracy and temporal resolution of site-level methane emission inventories.
  • To support regulatory requirements and voluntary initiatives for methane emission reduction.

Main Methods:

  • Conducted an 11-month methane measurement campaign at oil and gas production sites.
  • Utilized continuous monitoring systems (CMS) to capture high-frequency emission data.
  • Reconciled CMS data, top-down snapshot measurements, and conventional bottom-up inventories.

Main Results:

  • Operator-level top-down methane measurements were lower during the end-of-project phase compared to the baseline phase.
  • Gaps were identified between end-of-project top-down measurements and bottom-up site-level inventories.
  • CMS data successfully reconciled these gaps, validating snapshot measurements and informing site-level inventory updates.

Conclusions:

  • A real-world demonstration of reconciling multiscale measurements (CMS, top-down, bottom-up) for site-level methane inventories was achieved.
  • This integrated approach enhances the accuracy of methane emission inventories, crucial for regulatory compliance and emission reduction goals.
  • The study highlights the importance of advanced measurement techniques for effective methane management in the oil and gas industry.