Oil/gas well integrity failures are a common but poorly constrained source of methane emissions to the atmosphere. As of 2014, Pennsylvania requires gas and oil well operators to report gas losses, both fugitive and process, from all active and unplugged abandoned gas and oil wells. We analyze 589,175 operator reports and find that lower-bound reported annual methane emissions averaged 22.1 Gg (-16.9, +19.5) between 2014 and 2018 from 62,483 wells, an average of only 47% of the statewide well inventory for those years. Extrapolating to the 2019 oil and gas well inventory yields well average emissions of 55.6 Gg CH4. These emissions are not currently included in the state's oil and gas emission inventory. We also assess compliance in reporting among operators and note anomalies in reporting and apparent workarounds to reduce reported emissions. Suggestions for improving the accuracy and reliability in reporting and reducing emissions are offered.

中文翻译：

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2014-2018年宾夕法尼亚州活跃油气井的甲烷排放量报告。

石油/天然气井完整性故障是向大气排放甲烷的常见但受限制较弱的来源。截至2014年，宾夕法尼亚州要求气井和油井运营商报告所有活动和未堵塞的废弃气井和油井的天然气损失（包括逸散性和过程性）。我们分析了589,175份运营商报告，发现在2014年至2018年之间，报告的下限甲烷年排放量为62,483口井，平均为22.1 Gg（-16.9，+19.5），仅占当年全州井库存的47％。推算到2019年的石油和天然气井库存量会产生55.6 Gg的甲烷平均排放量。这些排放物目前不包括在该州的油气排放清单中。我们还将评估运营商在报告方面的合规性，并注意报告方面的异常情况以及为减少报告排放量而采取的明显解决方法。