黄3区低渗透裂缝性油藏提高CO2驱波及对策研究

油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (3): 9-13.

黄3区低渗透裂缝性油藏提高CO₂驱波及对策研究

汤勇¹,廖松林¹,雷欣慧²,余光明²,康兴妹²

^1. 西南石油大学油气藏地质及开发国家重点实验室,四川成都 610500
^2. 中国石油长庆油田分公司勘探开发研究院,陕西西安 710018

收稿日期:2019-01-31 发布日期:2019-07-02 出版日期:2019-06-26
作者简介:汤勇（1975 —）,男,教授,博士生导师,本刊第二届编委会委员,油气藏流体相态理论与测试,气田及凝析气田开发、注气提高采收率。E-mail： tangyong2004@126.com。
基金资助:
四川省教育厅创新团队计划项目“温室气体二氧化碳埋存与资源化利用”(16TD0010);国家科技重大专项 “CO₂捕集、驱油与埋存技术示范工程”(2016ZX05056)

Study on improving the sweep efficiency of CO₂ flooding in low permeability fractured reservoirs in Huang-3 block

Tang Yong¹,Liao Songlin¹,Lei Xinhui²,Yu Guangming²,Kang Xingmei²

^1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
^2. Exploration and Development Research Institute, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China

Received:2019-01-31 Online:2019-07-02 Published:2019-06-26

摘要/Abstract

摘要：

黄3区低渗裂缝性油藏开展注CO₂驱先导实验整体增油降水效果明显,但部分井见气,气窜现象严重,降低了CO₂驱增油效果。为了提高低渗裂缝性油藏CO₂驱波及效率,采用示踪剂监测结合生产动态分析及数值模拟生产历史拟合的方式识别了储层优势渗流通道。在此基础上获取考虑优势通道的井组数值模拟模型,通过组分油藏数值模拟技术研究优势通道对CO₂驱替效果的影响,并模拟对比了4种改善波及对策提高驱油效率的措施。结果显示,优势通道使CO₂驱原油采收率下降7 %。采用高强度封堵措施封堵优势通道效果最好,RF提高了1.8 %;优势通道井气窜早期关井效果较好;注水保持地层压力时其次;生产井GOR达到2 000 m ³/m ³时关井相对较差,RF仅提高0.11 %。研究成果对于低渗裂缝性油藏注气驱方案设计具有指导意义。

关键词: 低渗透油藏, 优势渗流通道, CO₂驱, 提高波及效率

Abstract:

A CO₂ flooding pilot test was carried out on the low permeability fractured reservoirs in Huang-3 block. The research results indicated that there were obvious oil-increasing effects in the overall area, but the gas channeling phenomenon was serious in some wells, resulting in a poor effect of CO₂ flooding. In order to improve the CO₂ flooding efficiency of low permeability fractured reservoirs, the dominant flow channels were identified by tracer monitoring combined with production dynamic analysis and numerical simulation of production history fitting. On this basis, a numerical simulation model of the well group considering the dominant channels was obtained. The effects of the dominant channels on the CO₂ displacement were studied by the numerical simulation technology of the component reservoirs, and four measures to improve the oil displacement efficiency were simulated. The results showed that the dominant channels reduced the CO₂ flooding oil recovery by 7 %. The best effect was obtained by blocking the dominant channels with high-intensity plugging measures, and the RF had increased by 1.8 %. The second best effect was when the dominant channels wells were shut down in the early stage of the gas channeling. Then followed when the water injection maintained the formation pressure. Shut in of the well was relatively poor when the GOR of production well reached 2 000 m ³/m ³, and the RF only increased by 0.11 %. The research results have guiding significance for the design of gas injection drive scheme for low permeability fractured reservoirs.

Key words: low permeability reservoir, dominant channel, CO₂ flooding, improve sweep efficiency

中图分类号:

TE357.7

汤勇,廖松林,雷欣慧等. 黄3区低渗透裂缝性油藏提高CO₂驱波及对策研究[J]. 油气藏评价与开发, 2019, 9(3): 9-13.

Yong Tang,Songlin Liao,Xinhui Lei, et al. Study on improving the sweep efficiency of CO₂ flooding in low permeability fractured reservoirs in Huang-3 block[J]. Reservoir Evaluation and Development, 2019, 9(3): 9-13.

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参考文献 17

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黄3区地质特征	特征值
储层油组埋深/ m	2 750
储层平均孔隙度（岩心分析数据统计）,%	8.3
平均空气渗透率（岩心分析数据统计）/10^-3μm²	0.27
裂缝密度（成像测井图分析）/（条·m^-1）	5~7
构造裂缝倾角（成像测井图分析）/（°）	75~90

方案编号	关井条件	RF,%	累计产油量/10⁴t	CO₂ 注入量/10⁴t	换油率/（t·t^-1）
1	优势通道井关井	14.18	4.51	20.84	0.217
2	优势与次优势通道井关井	13.39	4.26	22.23	0.192
3	优势通道井转注且次优势通道井关井	14.29	4.55	22.61	0.201

黄3区低渗透裂缝性油藏提高CO₂驱波及对策研究

Study on improving the sweep efficiency of CO₂ flooding in low permeability fractured reservoirs in Huang-3 block

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