For 2018, the year with the latest reliable data, the US was the world’s top emitter from upstream oil and gas producing activities in absolute terms, releasing a total of 133 million t of CO2, followed by Russia (116 million t) and Canada (114 million t). The emission numbers referenced here do not include what Rystad categorises as midstream elements (e.g. gas processing plants).
When it comes to CO2 intensity per produced boe, Norway shows the lowest upstream CO2 footprint among the top 10 producing countries, with approximately 7 kg of CO2/boe produced. Norway introduced a CO2 pricing mechanism in the early 1990s, while also adhering to the EU carbon trading system, which has motivated operators in the country to put extra emphasis on emission-reducing measures and technologies.
Several major Norwegian offshore fields, such as the giant Johan Sverdrup project, are now partly or fully electrified by power from shore, thus reducing CO2 extraction emissions substantially – even approaching zero in some instances. Furthermore, gas flaring has been banned in the country since the 1970s, with certain exceptions for safety purposes, which has resulted in a very low flaring intensity.
The UAE, Qatar and Saudi Arabia are challenging Norway for the top position in terms of CO2 intensity, each with emissions at or below 10 kg/boe. Saudi Arabia and the UAE benefit from hosting large field developments with stable production levels and limited flaring, all of which contribute to low emission intensities. Moreover, production in these countries is dominated by light and medium grade crudes, which are less energy-intensive to extract compared to heavier oils.
At the other end of the scale, Canada and Iraq are both among the world’s highest upstream emitters, albeit for entirely different reasons.
Canada, with an average intensity of 39 kg/boe, has a high share of its production from oilsands, typically emitting three to five times more CO2/bbl than the global average of 18 kg/boe. Heavy oil produced by mining or in-situ is more complicated to extract and the process is very energy-intensive. In recent years several major producers have divested their assets in these segments due to the expensive extraction process and the high carbon footprint.
Iraq, on the other hand, with an intensity of 31 kg/boe, has relatively low extraction emissions. However, the lack of gas infrastructure in the country means that significant volumes of associated gas are flared directly. The country must, in fact, import gas in order to meet its energy requirements. An expansion of Iraq’s domestic gas infrastructure would allow it to reduce flaring and imports, but such plans have yet to materialise.
“The average upstream CO2 emission intensity of oil and gas production worldwide was about 18 kg/boe in 2018, but the variation between producers is high – both in terms of countries and companies. Between individual fields, the variation is even higher,” said Rystad Energy’s Jon Erik Remme, Senior Upstream Analyst and Product Manager of Emissions Solution.
The amount of flaring served as a key distinguisher leading to a difference of 23 kg/boe observed between the highest and the lowest intensities in Rystad's analysis. In addition to flaring, the inherent differences in extraction emissions driven by the method of extraction, the field type, age of the field and other factors collectively yielded a difference of around 30 kg/boe between the highest and the lowest intensities.
*Note: Disclosure of emission data varies between countries, impacting the precision of emission estimates. Rystad Energy’s new global emissions report refers to numbers from 2018, given the wide discrepancy of country-level data quality for 2019. Rystad will update its report with new 2019 projections at a later stage.
Read the article online at: https://www.oilfieldtechnology.com/hse/29052020/rystad-energy-canadas-upstream-industry-has-highest-co2-emission-intensity-norway-lowest/