methane gas capture case study - us epa• september 2009: study concluded 16 mmcf is vented during...
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![Page 1: Methane Gas Capture Case Study - US EPA• September 2009: Study concluded 16 MMCF is vented during an average flowback • December 2009: Completion program changed. Tubing run immediately](https://reader034.vdocument.in/reader034/viewer/2022042303/5ece235dfe281a66ee5138b6/html5/thumbnails/1.jpg)
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SWN Company Background
• SEECO
– Fayetteville and Arkoma (Arkansas)
• Southwestern Energy Production Company
– Pennsylvania
– Texas, Louisiana, Oklahoma
– SWN Drilling Company, Inc.
• SWN E&P Services L.L.C.
– Desoto Sand L.L.C.
– SWN Well Services L.L.C.
• SWN Resources Canada Inc.
• Desoto Gathering Company
• Angelina Gathering Company
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SWN Company Background
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EPA Subpart W
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SWN EPA Natural Gas STAR
• 2006 Initial Reporting Year - 329.266 MMSCF
• 2007 “Rookie of the Year”
• 2011 “Production Partner of the Year”
• 2012 Report
– 11.689 BCF
– 36.3 BCF Cumulative
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SWN EPA Natural Gas STAR Reductions
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SWN 2010 EPA STAR Reductions
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SWN 2012 EPA STAR Reductions
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SWN Gas Capture
• Since 2009 - 27.562 BCF recovered by Gas Capture and Green
Completions
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SWN Gas Capture: History - Background
• Pre 2010: Wells vented until tubing flow could be established
• September 2009: Study concluded 16 MMCF is vented during an average flowback
• December 2009: Completion program changed. Tubing run immediately after frac plug drill out, no casing flowback
• December 2009: Flowback scheme “modified” to allow selling gas via the casing/tubing annulus.
• January 2010: Separators upgraded, allowing for 2000+ bwpd capability, “modified” flowback in full use.
• January 2010: First “Gas Capture” well was executed.
• April 2010: Completed 19th full “Gas Capture” operation.
• September 2010: Completed the 100th full “Gas Capture” operation
• October Forward: Expanded “Gas Capture” (Ventless Restoration) to recompletions.
10
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SWN “Gas Capture”
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SWN Gas Capture - Portable Compressor
• Portable Caterpillar 3406
• 200-300 MCF Gas Compressed
• 8-12 Hours
• Target 2000 psi
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SWN Gas Capture -Sand Separator and Sand Box
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SWN Gas Capture
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SWN Gas Capture - Fat Boy Separators
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SWN Gas Capture - Flowback Water to Frac Tank
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SWN Gas Capture - Water Recovery/Recycling
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SWN Gas Capture - Gas to Sales
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SWN Gas Capture - Updated Gas Capture Layout
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SWN Gas Capture – Fayetteville vs Marcellus
• Fayetteville – Low pressure reservoir
• Need for gas
compression/injection
– Low sales line
pressure~65 psia
• Marcellus – High pressure reservoir
– High sale line pressure
>500 psi
– Installing additional
compression to lower line
pressure
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In the Past
• Regulated by OOOO – Hydraulically Fractured Gas Well Completion Flowbacks
– Hydraulically Fractured Gas Well Recompletion Flowbacks
– Continuous Bleed Pneumatic Controllers
– Oil, Condensate, and Produced Water Storage Tanks
– Reciprocating Compressor (not at wellpad)
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Pre and Post NSPS OOOO
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Moving Forward
• Future Opportunities – Reciprocating compressors at well pad
– No bleed pneumatics
– Solar Powered pumps
– Thermostat controllers
– Liquids Unloadings
– Storage Tanks < 6 tpy
– Gas capture of blowdowns
– Fleet and vehicle conversions to CNG
– Diesel/Gas Drill Rigs and Completions Rigs
– Directed Inspection/Maintenance
– Methane Leadership Initiative
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SWN Rig 26 – Natural Gas Powered Rig
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Methane Leadership Initiative
• Voluntary methane
reduction initiative
• Measure methane
emissions
• Implement leading
practices where
practicable
• Cultivate participation by
others. Production sector
first, then value chain
• Publically report
“validated/verified”
emissions reductions