Directed Inspection and Directed Inspection and Maintenance (DI&M) Maintenance (DI&M) Lessons Learned from Lessons Learned from Natural Gas STAR Partners Natural Gas STAR Partners Producers Technology Transfer Workshop Producers Technology Transfer Workshop Devon Energy and Devon Energy and EPA’s Natural Gas STAR Program EPA’s Natural Gas STAR Program Casper, Wyoming Casper, Wyoming August 30, 2005 August 30, 2005
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Directed Inspection and Maintenance (DI&M) Lessons Learned from Natural Gas STAR Partners Producers Technology Transfer Workshop Devon Energy and EPA’s.
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Directed Inspection and Maintenance Directed Inspection and Maintenance (DI&M)(DI&M)
Lessons Learned fromLessons Learned fromNatural Gas STAR PartnersNatural Gas STAR Partners
Producers Technology Transfer WorkshopProducers Technology Transfer Workshop
Devon Energy and Devon Energy and EPA’s Natural Gas STAR ProgramEPA’s Natural Gas STAR Program
Oil and Gas Production Sector Oil and Gas Production Sector Methane EmissionsMethane Emissions
The production sector has several large The production sector has several large methane emission sources that can be targeted methane emission sources that can be targeted for reductionsfor reductions
Pneumatic Pneumatic DevicesDevices61 Bcf61 Bcf
Dehydrators Dehydrators and Pumpsand Pumps17 Bcf17 Bcf
Gas leaks are Gas leaks are invisibleinvisible, , unregulated unregulated andand gogo unnoticedunnoticed
Gas STAR Partners find that valves, Gas STAR Partners find that valves, connectors, compressor seals and open-connectors, compressor seals and open-ended lines (OELs) are major sourcesended lines (OELs) are major sources 27 Bcf of methane emitted per year by 27 Bcf of methane emitted per year by
reciprocating compressors seals and OELs, reciprocating compressors seals and OELs, each contributing equally to the emissionseach contributing equally to the emissions
Source: Clearstone Engineering, 2002, Identification and Evaluation of Opportunities to Reduce Methane Losses at Four Gas Processing Plants. Report of results from field study of 4 gas processing plants in WY and TX to evaluate opportunities to economically reduce methane emissions.
Fugitive losses can be dramatically reduced Fugitive losses can be dramatically reduced by implementing a DI&M programby implementing a DI&M program
Voluntary program to identify and fix leaks Voluntary program to identify and fix leaks that are cost effective to repair that are cost effective to repair
Survey cost will pay out in the first yearSurvey cost will pay out in the first year
Provides valuable data on leakers with Provides valuable data on leakers with information of where to lookinformation of where to look
Direct Inspection and MaintenanceDirect Inspection and Maintenance Cost-effective practice by definitionCost-effective practice by definition Find and fix significant leaksFind and fix significant leaks Choice of leak detection technologiesChoice of leak detection technologies Strictly tailored to company’s needs Strictly tailored to company’s needs
DI&M is NOT the regulated volatile organic DI&M is NOT the regulated volatile organic compound (VOC) leak detection and repair compound (VOC) leak detection and repair program (LDAR) program (LDAR)
Real-time visual image of gas leaksReal-time visual image of gas leaks Quicker identification & repair of leaksQuicker identification & repair of leaks Screen hundreds of components an hourScreen hundreds of components an hour Screen inaccessible areas simply by viewing themScreen inaccessible areas simply by viewing them
A successful, cost-effective DI&M program A successful, cost-effective DI&M program requires measurement of the leaksrequires measurement of the leaks
A high volume sampler is an effective tool for A high volume sampler is an effective tool for quantifying leaks and identifying cost-quantifying leaks and identifying cost-effective repairseffective repairs
Open-ended lines, compressor seals, Open-ended lines, compressor seals, blowdown, engine-starter and pressure relief blowdown, engine-starter and pressure relief valves represent <3% of components but valves represent <3% of components but >60% of methane emissions>60% of methane emissions
The business of leak detection is about to The business of leak detection is about to change dramatically with new technologychange dramatically with new technology
Partner A: Leaking cylinder head was tightened, Partner A: Leaking cylinder head was tightened, which reduced the methane emissions from almost which reduced the methane emissions from almost 64,000 Mcf/yr to 3,300 Mcf/yr64,000 Mcf/yr to 3,300 Mcf/yr Repair required 9 man-hours of laborRepair required 9 man-hours of labor Gas savings were approximately 60,700 Mcf/yrGas savings were approximately 60,700 Mcf/yr Value of gas saved was $182,100/year at $3/McfValue of gas saved was $182,100/year at $3/Mcf
Partner B: One-inch pressure relief valve emitted Partner B: One-inch pressure relief valve emitted almost 36,774 Mcf/yralmost 36,774 Mcf/yr Required five man-hours of labor and $125 of materialsRequired five man-hours of labor and $125 of materials Value of the gas saved was $110,300 at $3/McfValue of the gas saved was $110,300 at $3/Mcf