Methane emission quantification from gas migration (GM) and surface casing vent flow (SCVF) is needed to support strategic methane reduction targets and mitigate explosion and groundwater quality risks. This paper assessed which of 451 990 Alberta oil and gas wells should have been (or will be) tested for SCVF and/or GM according to regulations, and compared the results with the provincial GM testing database. As of 2017, GM testing was required on 3.5%, and reported for 0.75%, of Alberta’s energy wells. Similarly, SCVF testing was required on 58.2%, and reported for 6.2%, of all wells. An estimated 14.5% of all wells were legally abandoned before GM and SCVF testing regulations existed. All of the remaining wells will require SCVF testing prior to legal abandonment, and an estimated 32.9% to 75.5% of the total will not require GM testing before abandonment based on current regulations. The cumulative number of ‘serious’ GM reports that have remained open since submission has continuously been increasing each year, which contradicts the requirement for repair within 90 days, suggesting regulations are not enforced. The GM testing procedure is inadequate for quantitative testing. We conclude that fugitive methane emissions, and in particular gas migration, are not well constrained in Alberta. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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甲烷在亚伯达省油井周围的逸散性气体迁移

需要通过气体迁移（GM）和地表套管排放流量（SCVF）对甲烷排放进行量化，以支持战略性甲烷减排目标并减轻爆炸和地下水质量风险。本文评估了451990阿尔伯塔省石油和天然气井中的哪些应根据法规进行（或将进行）SCVF和/或GM测试，并将结果与​​省级GM测试数据库进行了比较。截至2017年，阿尔伯塔省能源井需要进行GM测试的3.5％，据报道为0.75％。同样，所有井的58.2％要求进行SCVF测试，据报道，所有井的报告率为6.2％。在GM和SCVF测试法规出台之前，约有14.5％的井被合法弃置。其余所有油井在合法弃置之前都需要进行SCVF测试，估计有32.9％的油井需要进行测试。根据现行法规，有5％的人在放弃之前不需要进行GM测试。自提交以来，每年一直开放的“严重” GM报告的累积数量逐年增加，这与90天之内的维修要求相矛盾，这表明法规没有得到执行。GM测试程序不足以进行定量测试。我们得出结论，在阿尔伯塔省，逃逸的甲烷排放量，特别是气体迁移，没有受到很好的限制。©2020年化学工业协会和John Wiley＆Sons，Ltd. GM测试程序不足以进行定量测试。我们得出结论，在阿尔伯塔省，逃逸的甲烷排放量，特别是气体迁移，没有受到很好的限制。©2020年化学工业协会和John Wiley＆Sons，Ltd. GM测试程序不足以进行定量测试。我们得出结论，在阿尔伯塔省，逃逸的甲烷排放量，特别是气体迁移，没有受到很好的限制。©2020年化学工业协会和John Wiley＆Sons，Ltd.