中国石化新闻网讯 据天然气工业8月24日消息称，2020 年，美国 5 个主要陆上原油产区的浸润沉淀天然气（即浸润天然气）年产量自 2016 年以来首次上升，浸润溶解天然气是油井生产的天然气。这五个地区（二叠纪、巴肯、鹰福特、尼奥布拉拉和阿纳达科）的伴生气产量份额同比下降了1.5%，平均占该地区天然气产量的37.7%。在这些地区石油产量上升 9.2% 的情况下，2020 年的伴生气产量平均为 142 亿立方英尺/天（比 2019 年上升 4.1%）。
当天然气在岩层的压力下沉淀在原油中，当原油被带到地面释放压力时，伴生气就会被释放出来。到 2020 年，这五个地区的伴生气和石油产量的产量一直在减少。在2016年至2019年期间，由于新原油产量低，伴生气产量以最快速度快速增长(61亿立方英尺/天)。在应付 COVID-19 大流行之后，随着原油需求的上升，2020年的原油和浸润天然气产量都出现了上升。
伴生气包括天然气加工厂液体 (NGPL)，例如乙烷、丙烷、正丁烷、异丁烷和天然汽油。NGPL 用作生产塑料、纤维和其他产品的原料；它们还用作加热和运输。尽管2020年伴生气产量上升，但在乙烷市场需求旺盛的推展下，多年的伴生气产量增长造成了2020年NGPL产量的创纪录高位。自2014年以来，无论是在国内还是通过出口，乙烷消费一直在稳步增长。
朱佳妮 摘译自 天然气工业
Associated natural gas production declines in 2020, following three years of growth
In 2020, annual production of associated-dissolved natural gas (or associated gas)—which is natural gas produced from oil wells—declined in the combined five major U.S. onshore crude oil-producing regions for the first time since 2016. The share of associated gas produced in these five regions (Permian, Bakken, Eagle Ford, Niobrara, and Anadarko) declined by 1.5% year over year and averaged 37.7% of natural gas production in the regions. Associated gas production averaged 14.2 billion cubic feet per day (Bcfpd) in 2020 (a 4.1% decline from 2019) amid a 9.2% drop in oil production in these regions.
When natural gas dissolves in crude oil under the pressure of a rock formation, associated gas is released when the pressure on the crude oil is relieved by bringing it to the surface. Until 2020, the share of associated gas in these five regions, along with oil production, had been increasing. Between 2016 and 2019, associated gas production grew at its most rapid pace (6.1 Bcfpd) because of high levels of new crude oil production. Production of both crude oil and associated gas in 2020 declined with decreased demand for crude oil following responses to the COVID-19 pandemic.
In 2020, the Permian region, which spans parts of western Texas and eastern New Mexico, produced 50% of total U.S. associated gas. Only the Permian region increased its production of both crude oil and associated gas in 2020, but these increases did not offset declines in both crude oil and associated gas production in the other four regions. Some of this increase in associated gas production can be attributed to greater natural gas takeaway capacity in the Permian region.
Associated gas contains natural gas plant liquids (NGPLs) such as ethane, propane, normal butane, isobutane, and natural gasoline. NGPLs are used as feedstocks to produce plastics, fibers, and other products; they are also used for heating and for transportation. Despite the 2020 decline in associated gas, years of rising associated gas production led to record high volumes of NGPL production in 2020, driven by high ethane demand. Ethane consumption has been growing steadily both domestically and through exports since 2014.