Sentences with phrase «well emissions of methane»

In 2015, the last year for which the Environmental Protection Agency (EPA) has published comprehensive inventory numbers, energy - related CO2 emissions accounted for 77 % of gross US GHG emissions, with the remainder coming from direct CO2 emitted in industrial processes as well emissions of methane, nitrous oxide, and other greenhouse gasses.

Not exact matches

While this is a good way to get total emissions of methane in a remote location where the main source of the gas is natural gas production, it is not a good way to pin emissions down to any one well, gathering or processing activity in the basin.

Most of ConocoPhillips» emissions in the San Juan Basin are from venting of methane to the atmosphere during a well cleaning process called «liquids unloading.»

Typically, during the drilling process, methane emissions are estimated to be between 0.04 and 0.3 gram of methane per second per well.

«The methane emissions from the gas wells... are surprisingly high considering that all of these wells were still being drilled, had not yet been hydraulically fractured, and were not yet in production,» the paper reports.

For wells with plunger lifts that vent to the atmosphere, emissions averaged 1,000 scf to 10,000 scf of methane per event.

A team of researchers from the Cockrell School of Engineering at The University of Texas at Austin and environmental testing firm URS reports that a small subset of natural gas wells are responsible for the majority of methane emissions from two major sources — liquid unloadings and pneumatic controller equipment — at natural gas production sites.

The study team hopes its measurements of liquid unloadings and pneumatic devices will provide a clearer picture of methane emissions from natural gas well sites and about the relationship between well characteristics and emissions.

«There are also other important measures to reduce methane emissions from coal mining, municipal waste treatment and gas distribution, for example, as well as black carbon emission reductions through elimination of high - emitting vehicles, use of cleaner biomass cooking and heating stoves, replacement of kerosene wick lamps with LED lamps and other measures,» adds Zbigniew Klimont of the International Institute for Applied Systems Analysis, Austria, who also took part in the study.

The study is the second phase of the team's 2013 study, which included some of the first measurements for methane emissions taken directly at hydraulically fractured well sites.

Lamb's methane emissions project is part of a group of ongoing studies that are looking at the entire natural gas supply chain, from the production wells to the transmission pipeline system to local distribution systems.

A new study provides one of the first quantitative estimates of the methane leak rate from the blowout of a natural gas well in California in 2015, suggesting that emissions from this event temporarily doubled those from all other sources in the entire Los Angeles Basin, including landfills, dairies, and other leaks.

Experts on greenhouse - gas emissions tell me that every time my car burns a gallon of gasoline, I am putting more than 25 pounds of carbon dioxide into the atmosphere as well as a smaller amount of methane, nitrous oxide, and various other toxic gases.

On Tuesday, the governments of California and six other western states as well as four Canadian provinces proposed a new plan to cut greenhouse gas emissions by 15 percent below 2005 levels by 2020 using a similar cap - and - trade market — and would expand such regulations to encompass not just CO2 from power plants but also cars and trucks as well as other greenhouse gases, such as potent methane.

This stability in methane levels had led scientists to believe that emissions of the gas from natural sources like livestock and wetlands, as well as from human activities like coal and gas production, were balanced by the rate of destruction of methane in the atmosphere.

The United States has released an ambitious, climate - and conservation - focused agenda for its 2 - year chairmanship that includes pushing for more research on black carbon, which accelerates melting in the region, and on emissions of the potent greenhouse gas methane from the seabed and permafrost, as well as creating a network of marine protected areas in the Arctic and equipping Arctic villages with renewable energy sources.

A 16 - year study was used for robust estimates of the yield potential on organically managed crop land in southern Wisconsin as well as nitrous oxide and methane emissions and soil carbon.

Environmental controls designed to prevent leaks of methane from newly drilled natural gas wells are effective, a study has found — but emissions from existing wells in production are much higher than previously believed.

In the new paper, published in the journal Environmental Research Letters, Höglund - Isaksson estimated global methane emissions from oil and gas systems in over 100 countries over a 32 - year period, using a variety of country - specific data ranging from reported volumes of associated gas to satellite imagery that can show flaring, as well as atmospheric measurements of ethane, a gas which is released along with methane and easier to link more directly to oil and gas activities.

Last year, for instance, an industry - funded study on the methane emissions from fracking wells was published in the prestigious journal, Proceedings of the National Academy of Sciences.

But based on that data, they estimate that emissions from abandoned wells represents as much as 10 percent of methane from human activities in Pennsylvania — about the same amount as caused by current oil and gas production.

The researchers have used their results to extrapolate total methane emissions from abandoned wells in Pennsylvania, although they stress that the results are preliminary because of the relatively small sample.

While examining ways that carbon dioxide could escape underground storage, Kang wondered about the effect of old wells on methane emissions.

Even better, by analyzing some 400 potential soot - and methane - emission control measures, the international team of researchers found that just 14 deliver «nearly 90 percent» of the potential benefits.

Many studies investigating methane leaks have used different methods of measuring methane emissions, but none have been able to capture so well how methane emissions fluctuate during the course of a year, he said.

«The overall significance is that although we already know that reducing methane emissions can bring great societal benefits via decreased near - term warming and improved air quality, and that many of the sources can be controlled at low or even negative cost, we still need better data on emissions from particular sources,» Duke University climate sciences professor Drew Shindell said.

Scientists unaffiliated with the study said it shows better data is needed to fully understand the extent of the climate challenge posed by landfill methane emissions.

Economists and scientists developed the calculation to give policymakers a better idea of the economic benefits of cutting methane emissions.

The bulk of methane emissions in the United States can be traced to a small number of «super emitting» natural gas wells, according to a new study.

Or it could be that methane variations are mostly produced by wetland emission, driven by climate change as well as land use decisions, according to another set of papers.

The new interpretations reveal methane emissions may account for a third of the climate warming from well - mixed greenhouse gases between the 1750s and today.

The study found that natural gas end use sources — like gas meters, furnaces, boilers and hot water heaters — as well as landfills, are responsible for a large portion of urban methane emissions.

The research team then used two different methods to calculate the best estimates of global methane emissions from the data.

The best way to estimate the magnitude of fossil methane emissions is by using measurements of methane isotopes, such as carbon.

There is an urgent need to better reconcile bottom - up estimates with atmospheric estimates of methane emissions.

But the new Purdue study suggests the EPA's inventories may not be quantifying all the methane emissions from wells being drilled because few people have measured methane leaking from wells in the earliest stage of well development — the actual drilling itself.

A University of Texas study found last year that natural gas wells leak methane at about the rate reported in U.S. Environmental Protection Agency methane emission inventories, and the leaks can be contained with emissions control technology.

The EPA estimated in 2011 that natural gas drilling accounts for about 1,200 gigagrams, or 2.6 billion pounds, of methane emissions each year from well completions, equipment leaks and pneumatic controllers.

But a study published Monday adds to the growing evidence those escaping gases, called «fugitive» emissions, are numerous, especially methane emissions while a well is being drilled, a phase of well development previously thought to emit little if any methane.

The study shows that during drilling, as much as 34 grams of methane per second were spewing into the air from seven natural gas well pads in southwest Pennsylvania — up to 1,000 times the EPA estimate for methane emissions during drilling, Purdue atmospheric chemistry professor and study lead author Paul Shepson said in a statement.

Estimates of methane emissions from the Arctic have risen, from land (Walter et al 2006) as well now as from the continental shelf off Siberia.

Because methane is mostly well - mixed in the atmosphere, emissions from the Arctic or from the US must be seen within the context of the global sources of methane to the atmosphere.

The study, «Toward a better understanding and quantification of methane emissions from shale gas development,» was published in the Proceedings of the National Academy of Sciences and undertaken by Dana R. Caulton and Paul B. Shepson of Purdue and a host of co-authors, including Anthony Ingraffea and Robert Howarth, Cornell scientists who are prominent foes of fracking, along with Renee Santoro of Physicians Scientists & Engineers for Healthy Energy, a nonprofit group that has been critical of fracking * (Ingraffea is affiliated with the group, as well).

Using this new information as well as other independent studies on methane emissions published since 2011, and the latest information on the climate influence of methane compared to carbon dioxide from the latest synthesis report from the Intergovernmental Panel on Climate Change released in September of this year, it is clear that natural gas is no bridge fuel.

The nation's largest single source of methane emissions is the vast network of infrastructure, including wells, pipelines and storage facilities, that supplies U.S. natural gas.

The agency also took an overdue step to clarify how to curb emissions of methane from the hundreds of thousands of wells, compressors and other leaky parts of the nation's sprawling oil and gas industry, issuing an «Information Collection Request» requiring companies, among other things, to describe the types of technologies that could be used to reduce emissions.

An E.P.A. review of methane emissions from gas wells in the United States strongly implies that all of these figures may be too low.

There's some torquing, as well, around a new commentary on the measured and projected carbon emissions (both in methane and carbon dioxide) from warming, thawing Arctic tundra published in this week's issue of Nature.

That's why a great deal of attention was paid last week to the results of a two - day aerial survey over gas fields in southwestern Pennsylvania that calculated emission rates of methane (the main component of natural gas) from two well pads still in the drilling phase.

The need for greater certainty in the methane budget, as well as the need for better information upon which to facilitate methane emissions reductions, has motivated the large effort EDF has been leading, one involving dozens of academic experts.