How much methane leaks out during fracking? | MNN


Critics of the pure fuel extraction approach often known as fracking have lengthy criticized it for leaking an excessive amount of methane — a potent greenhouse fuel — into the ambiance in the course of the extraction course of. The Environmental Safety Company lately estimated that pure fuel operations emitted about 145 million metric tons of methane in 2011, making it the most important supply of those emissions within the nation.

Now a brand new research, sponsored by the Environmental Protection Fund (EDF) and 9 power petroleum corporations, finds that emissions could also be decrease than beforehand thought, not less than throughout a part of the extraction course of. In line with the research (pdf), revealed within the Proceedings of the Nationwide Academy of Sciences, the typical methane emissions from the properly completion flowbacks at 190 pure fuel websites ranged from zero.01 metric tons to 17 metric tons. The EPA’s estimate labored out to 81 metric tons per website. The research additionally discovered that leaks in different components of the method — pneumatic pumps, controllers and different gear — was both equal to or greater than the EPA beforehand estimated. Finally, this meant that complete emissions got here fairly near the EPA’s estimates.

The researchers, from the College of Texas, got here up with these numbers by taking direct measurements of methane emissions. Earlier calculations have been much less direct and used both engineering estimates or airplane flyover measurements.

One of many research’s co-authors informed Inside Climate News that he hopes this info will assist to “name consideration to finest practices” within the business which might cut back methane leaks.

The $2.three million research has earned criticism over its funding, 90 % of which got here from petroleum corporations. Critics additionally level out that the pure fuel business selected the websites, so the outcomes of the research is probably not indicative of the typical pure fuel properly. In line with a press launch (pdf) from the EDF, the vast majority of the wells examined had “gear in place that reduces methane emissions by 99 %.” There is no such thing as a indication of how universally that expertise is utilized all through the business.

However the truth that the expertise seems to work will be thought-about excellent news. The research “reveals that when producers use practices to seize or management emissions … methane will be dramatically diminished,” EDF Affiliate Vice President Mark Brownstein stated within the press launch. “The research additionally demonstrated, nonetheless, that sure methane emissions are bigger than beforehand thought, indicating that there are numerous additional alternatives to cut back emissions.”

Along with the EDF, funders for this new research embody Andarko Petroleum Firm, BG Group, Chevron, Encana Oil & Gasoline, Pioneer Pure Sources Firm, Shell, Southwestern Vitality, Talisman Vitality, and ExxonMobile subsidiary XTO Vitality.

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