石油化工高等学校学报 ›› 2024, Vol. 37 ›› Issue (5): 28-37.DOI: 10.12422/j.issn.1006-396X.2024.05.004

• 石油工程 • 上一篇    下一篇

大庆龙西低渗油藏开发中硫化氢生成机理研究

孙红宇1(), 钟立国1(), 张海龙2, 林庆祥2, 王珂昕2, 杨光2, 杨玉财2   

  1. 1.中国石油大学(北京) 非常规油气科学技术研究院,北京 102249
    2.大庆油田有限责任公司 井下作业分公司,黑龙江 大庆 163453
  • 收稿日期:2024-05-11 修回日期:2024-06-17 出版日期:2024-10-25 发布日期:2024-11-01
  • 通讯作者: 钟立国
  • 作者简介:孙红宇(1995⁃),男,博士研究生,从事提高采收率、HSE等方面的研究;E⁃mail:1812184907@qq.com
  • 基金资助:
    中国石油天然气股份有限公司重大科技专项“难采储量有效动用技术研究与试验”(2016E?0210)

Study on the Causes of Hydrogen Sulfide Generation in Daqing Longxi Low⁃Permeability Reservoir Development

Hongyu SUN1(), Liguo ZHONG1(), Hailong ZHANG2, Qingxiang LIN2, Kexin WANG2, Guang YANG2, Yucai YANG2   

  1. 1.Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249,China
    2.Downhole Operation Company of Daqing Oilfield Company Limited,Daqing Heilongjiang 163453,China
  • Received:2024-05-11 Revised:2024-06-17 Published:2024-10-25 Online:2024-11-01
  • Contact: Liguo ZHONG

摘要:

在大庆龙西区块扶余油层开发过程中发现,该扶余油层中含硫化氢(H2S)且存在其质量浓度超过阈限值(15.0 mg/m3)的情况,但其生成H2S机制尚不明确。采用室内H2S生成机理实验与基于PHREEQC和CMG软件的数值模拟相结合的方法,开展了龙西区块地层生成H2S的机理研究。结果表明,高温储层(100~125 ℃)生成H2S的机理为硫酸盐热化学还原反应,H2S的质量浓度为3.20~6.10 mg/m3;低温储层(≤60 ℃)生成H2S的机理为硫酸盐还原菌(SRB)还原反应,H2S的质量浓度最高可达29.70 mg/m3;压裂液通过降低近井地带温度,促进了SRB的繁殖,短时间内生成的H2S质量浓度较采出水中SRB生物还原反应提高了7.5倍;1 m3酸液与0.80 mol FeS的岩心和堵塞物反应生成H2S的质量浓度分别为3 330.69、11 466.75 mg/m3。因此,压裂和酸化是龙西区块扶余油层开发生成H2S的主要机理。

关键词: 硫化氢, 硫酸盐还原菌, 硫酸盐热化学还原反应, 压裂液, 酸化, 地层温度

Abstract:

During the development of the Fuyu oil reservoir in the Longxi block of Daqing,hydrogen sulfide (H2S) was discovered and exceeded the threshold value (15.0 mg/m3), but its generation mechanism is still unclear. To investigate this, the mechanism of H?S generation in the Longxi block formation was investigated through laboratory experiments on H?S generation,combined with numerical simulations using PHREEQC and CMG software.The results show that the mechanism of H2S generation in high?temperature reservoirs (100~125 ℃) is sulfate thermochemical reduction reaction, with viscosity of H2S generated ranges from 3.20 mg/m3 to 6.10 mg/m3.In low?temperature reservoirs (≤60 ℃),the mechanism of H2S generation is sulfate?reducing bacteria reduction reaction,with a maximum H2S viscosity of up to 29.70 mg/m3.Fracturing fluid reduces the temperature in the near?wellbore zone, promoting SRB proliferation, and the viscosity of H2S generated in a short time increases by 7.5 times compared to the sulfate?reducing bacteria reduction reaction in produced water. The mass concentrations of H2S generated by the reaction of 1 m3 acid with the core and plug containing 0.80 mol FeS are 3 330.69 mg/m3 and 11 466.75 mg/m3,respectively. Therefore, fracturing and acidification are the main mechanisms for the generation of H2S during the development of the Fuyu oil reservoir in the Longxi block.

Key words: Hydrogen sulfide, Sulfate?reducing bacteria, Sulfate thermochemical reduction reaction, Fracturing fluid, Acidification, Formation temperature

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引用本文

孙红宇, 钟立国, 张海龙, 林庆祥, 王珂昕, 杨光, 杨玉财. 大庆龙西低渗油藏开发中硫化氢生成机理研究[J]. 石油化工高等学校学报, 2024, 37(5): 28-37.

Hongyu SUN, Liguo ZHONG, Hailong ZHANG, Qingxiang LIN, Kexin WANG, Guang YANG, Yucai YANG. Study on the Causes of Hydrogen Sulfide Generation in Daqing Longxi Low⁃Permeability Reservoir Development[J]. Journal of Petrochemical Universities, 2024, 37(5): 28-37.

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