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Emission Reduction Options for the Offshore Natural Gas and Petroleum Production Segment

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The EPA estimates methane emissions from the oil and natural gas industry in its annual Inventory of U.S. Greenhouse Gas Emissions and Sinks. The offshore natural gas and petroleum production segment contributes 11% to the total methane emissions from the oil and natural gas industry. The chart on the right shows the distribution of the top emission sources* in this segment, which represent 98% of the total emissions from offshore petroleum and natural gas production. Click on each emission source category to view one of many appropriate, cost-effective methane mitigation options below. A full list of emission mitigation options can be found here.

*Note: These emission estimates have an uncertainty associated with them. Not all facilities will have the same distribution of emissions between sources. Also, some emission sources are only present in a few facilities and may not be represented in the pie chart.

This pie chart breaks out seven major emission sources from the Offshore Natural Gas and Petroleum Production segment.  The largest source of emissions is from Vent Exhaust Gas, which accounts for 48% of emissions.  Emissions from Natural Gas Engines, Fugitives, and Flashing Losses from Tanks, Heater-Treaters, and Separators rank second, third, and fourth, accounting for 17%, 15%, and 13%, respectively.  Centrifugal Compressor Wet Seals, Pneumatic Devices, and Dehydrators occupy the final three spots, making up 3%, 2%, and less than 1% of emissions, respectively.  Other emission sources make up the remaining 2% of emissions.

“Other” Emission Sources: Uncombusted Methane, Pressure/Level Controllers, Mud Degassing, Well Drilling, Amine Units

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+ Install Automated Air/Fuel Ratio Controls

+ Directed Inspection and Maintenance at Compressor Stations

+ Installing Vapor Recovery Units on Storage Tanks

+ Replacing Wet Seals with Dry Seals in Centrifugal Compressors

+ Options for Reducing Methane Emissions from Pneumatic Devices in the Natural Gas Industry

+ Optimize Glycol Circulation and Install Flash Tank Separators in Glycol Dehydrators

Need Help?
EPA can assist with all questions related to technologies and practices to reduce methane emissions. To contact us click here.


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