SAGD蒸汽腔扩展阶段电加热机理及操作参数优化

doi:10.3969/j.issn.1006-6535.2022.03.018

特种油气藏 ›› 2022, Vol. 29 ›› Issue (3): 124-130.DOI: 10.3969/j.issn.1006-6535.2022.03.018

SAGD蒸汽腔扩展阶段电加热机理及操作参数优化

丁超^1,2, 杨兆臣², 吴永彬³, 王丽², 杨浩哲², 王超³

1.中国石油大学(北京),北京 102249;
2.中国石油新疆油田分公司,新疆克拉玛依 834000;
3.中国石油勘探开发研究院,北京 100083

收稿日期:2021-09-09 修回日期:2022-03-20 出版日期:2022-06-25 发布日期:2023-01-09
作者简介:丁超(1982—),男,高级工程师,2005年毕业于西南石油大学石油工程专业,现为中国石油大学(北京)油气田开发工程专业在读硕士研究生,主要从事稠油开发研究工作。
基金资助:
中国石油重大科技项目“井下高能长效电阻加热开采技术研究”(2017D-5008-04)

Electric Heating Mechanism and Operating Parameter Optimization in the Expansion Stage of SAGD Steam Chamber

Ding Chao^1,2, Yang Zhaochen², Wu Yongbin³, Wang Li², Yang Haozhe², Wang Chao³

1. China University of Petroleum (Beijing), Beijing 102249, China;
2. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
3. Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2021-09-09 Revised:2022-03-20 Online:2022-06-25 Published:2023-01-09

摘要/Abstract

摘要： 为进一步提高风城油田已进入蒸汽腔扩展阶段的SAGD井组水平段动用程度,利用典型储层参数建立电加热辅助SAGD一体化数值模型,开展井下电加热的渗流特征研究和操作参数优化设计。结果表明:SAGD扩展阶段实施井下电加热,具有定点升温、促进蒸汽腔发育、定点泄油和提高低渗段有效渗透率等4项重要机理;其合理注汽速度为158~171m³/d,蒸汽腔操作压力为4.9~5.4 MPa,注采井间压差为0.4～0.5 MPa,相邻井组井间压差需小于0.5 MPa;合理电加热时间为2.0～3.0 a,电加热器最高表面温度为250 ℃,每米功率为800～1 000 W;典型井组电加热3.0 a后水平段动用程度从67%提高至100%,日产油提高2~4 m³,累计油汽比从0.15提高至0.24,最终采收率达51.3%,提高8.1个百分点。该研究成果对改善SAGD开发效果具有一定指导意义。

关键词: 电加热, SAGD, 蒸汽腔, 日产油, 油汽比, 采收率, 风城油田

Abstract: To further improve the productivity of the horizontal intervals in SAGD well cluster that has entered the steam chamber expansion stage in Fengcheng Oilfield, an integrated numerical model of electric heating-assisted SAGD was established with typical reservoir parameters to study the seepage characteristics of downhole electric heating and optimize the design of operating parameters. The results showed that, downhole electric heating performed in the SAGD expansion stage had four important mechanisms: fixed-point heating, promotion of steam chamber development, fixed-point oil drainage, and improvement of effective permeability in low-permeability intervals; the reasonable steam injection rate was 158-171 m³/d, the steam chamber operating pressure was 4.9-5.4 MPa, the pressure difference between injection and production wells was 0.4-0.5 MPa, and the inter-well pressure difference between adjacent well clusters was less than 0.5 MPa; the reasonable electric heating duration was 2.0-3.0 years, the maximum surface temperature of the electric heater was 250 ℃, and the power was 800-1 000 W/m; the productivity of horizontal interval was increased from 67% to 100% after the typical well cluster was electrically heated for 3.0a, the daily oil production was increased by 2-4 m³/d,Accamulative oil-steam ratio in creased from 0.15 to 0.24, and the final recovery efficiency reached 51.3%, an increase of 8.1 percentage points. The study results can be used as a guidance for improving the development effect of SAGD.

Key words: electric heating, SAGD, steam chamber, daily oil production, oil-steam ratio, recovery efficiency, Fengcheng Oilfield

中图分类号:

TE357

丁超, 杨兆臣, 吴永彬, 王丽, 杨浩哲, 王超. SAGD蒸汽腔扩展阶段电加热机理及操作参数优化[J]. 特种油气藏, 2022, 29(3): 124-130.

Ding Chao, Yang Zhaochen, Wu Yongbin, Wang Li, Yang Haozhe, Wang Chao. Electric Heating Mechanism and Operating Parameter Optimization in the Expansion Stage of SAGD Steam Chamber[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 124-130.

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SAGD蒸汽腔扩展阶段电加热机理及操作参数优化

Electric Heating Mechanism and Operating Parameter Optimization in the Expansion Stage of SAGD Steam Chamber

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