The impact of CO2-enhanced oil recovery on oil production and lifespan of old oil pools: A Canadian example

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

AAPG Bulletin Pub Date : 2024-02-01 DOI:10.1306/09212322125

Mengwei Zhao

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Abstract

Analyses of oil production data from the Weyburn Midale oil pool reveal that CO2 injection substantially reduced the decline trend of annual oil outputs in an exponential way with an average decline rate of 2.5%, which is two times lower than that of the worldwide total giant oil fields (5.5% or 6.5%). Based on its production data, it is projected that without CO2 injection the pool would have ended its life by 2016 with an ultimate cumulative oil output of 448.1 million bbl (71.2 million m3) and a recovery factor of only 24.4%. However, with continuous CO2 injection, by 2055 when the pool will be celebrating its 100th birthday, it can still produce 4 million bbl (0.6 million m3) of oil annually with a cumulative output of 801.8 million bbl (127.5 million m3) of oil and a recovery factor of 43.7%, whereas an additional 9.2 TCF (259.9 billion m3) of CO2 will be poured into the pool. By 2100, after 100 yr of CO2 injection, the pool’s annual oil output could be near 1.5 million bbl (0.2 million m3) and its cumulative oil output would reach 914.0 million bbl (145.3 million m3) representing a recovery factor of 49.8%, whereas 21.3 TCF (604 billion m3) of more CO2 could be injected into and permanently stored in the pool. The CO2-enhanced oil recovery could extend the pool’s lifespan to 39 or even 84 more years.

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二氧化碳强化采油对石油产量和老油池寿命的影响：以加拿大为例

对 Weyburn Midale 油藏石油生产数据的分析表明，二氧化碳注入大大减少了石油年产量的下降趋势，平均下降率为 2.5%，是全球巨型油田总下降率（5.5% 或 6.5%）的两倍。根据其生产数据，如果不注入二氧化碳，预计到 2016 年，该油池将结束其生命，最终累计石油产量为 4.481 亿桶（7120 万立方米），采收率仅为 24.4%。然而，如果持续注入二氧化碳，到 2055 年油池将迎来它的 100 岁生日时，它每年仍可生产 400 万桶（60 万立方米）石油，累计产量为 8.018 亿桶（1.275 亿立方米）石油，采收率为 43.7%，而注入油池的二氧化碳将增加 9.2 TCF（2,599 亿立方米）。到 2100 年，在注入二氧化碳 100 年后，油池的年石油产出量将接近 150 万桶（20 万立方米），累计石油产出量将达到 9.14 亿桶（1.453 亿立方米），采收率为 49.8%，而注入并永久储存在油池中的二氧化碳将增加 21.3 TCF（6,040 亿立方米）。二氧化碳提高石油采收率可将油池的寿命延长至 39 年甚至 84 年。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AAPG Bulletin 工程技术-地球科学综合

CiteScore

6.60

自引率

11.40%

发文量

审稿时长

4.8 months

期刊介绍： While the 21st-century AAPG Bulletin has undergone some changes since 1917, enlarging to 8 ½ x 11” size to incorporate more material and being published digitally as well as in print, it continues to adhere to the primary purpose of the organization, which is to advance the science of geology especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources. Delivered digitally or in print monthly to each AAPG Member as a part of membership dues, the AAPG Bulletin is one of the most respected, peer-reviewed technical journals in existence, with recent issues containing papers focused on such topics as the Middle East, channel detection, China, permeability, subseismic fault prediction, the U.S., and Africa.