海上强底水砂岩油藏CO2-EOR-S数值模拟研究*

doi:10.11978/2017005

热带海洋学报 ›› 2017, Vol. 36 ›› Issue (5): 72-82.doi: 10.11978/2017005CSTR: 32234.14.2017005

海上强底水砂岩油藏CO₂-EOR-S数值模拟研究^*

刘雪雁^1,²(), 李鹏春¹, 周蒂¹, 陈广浩¹

1. 中国科学院边缘海与大洋地质重点实验室(南海海洋研究所), 广东广州 510301
2. 中国科学院大学, 北京 100049
3. Bureau of Economic Geology, University of Texas at Austin, TX 78758, USA;

收稿日期:2017-01-06 修回日期:2017-03-28 出版日期:2017-09-20 发布日期:2017-09-22
作者简介:
作者简介：刘雪雁(1992—), 女, 山东省莱芜市人, 在读硕士研究生, 主要从事二氧化碳提高采收率及地质封存研究。E-mail: xueyanliu1992@163.com
基金资助:
国家自然科学基金项目(41372256);美国能源部KeyLogic资助项目(K6000-697)

Simulation of CO₂-EOR-S in an offshore sandstone reservoir with strong bottom water

Xueyan LIU^1,²(), Pengchun LI¹, Di ZHOU¹, Jiemin LU³, Guanghao CHEN¹

1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Bureau of Economic Geology, The University of Texas at Austin, Texas 78758, USA

Received:2017-01-06 Revised:2017-03-28 Online:2017-09-20 Published:2017-09-22
About author:
Author:QIU Chunhua.E-mail: qiuchh3@mail. sysu.edu.cn
Supported by:
National Natural Science Foundation of China (41372256);KeyLogic Project of U.S. Department of Energy

摘要/Abstract

摘要：

二氧化碳驱提高采收率及地质封存 (CO₂-EOR-S)技术是目前实现温室气体减排和应对全球气候变暖最经济有效的手段之一。文章以珠江口盆地惠州21-1油田M10层为对象, 利用Petrel和CMG-GEM油藏数值模拟方法进行了注CO₂驱提高采收率能力评价、注CO₂流体状态方程拟合以及不同方案注采参数优化、合理方式优选, 以探讨该油层的CO₂-EOR-S潜力。对比9个模拟方案结果表明: 1) 在不同开采条件下, 混相驱、近混相驱和非混相驱方案比例4︰3︰2; 混相驱方案的采收率提高效果最为明显, 相较于未注入CO₂, 提高约5.48%~8.73%, 而近混相驱和非混相驱仅分别提高为2.96%~4.33%和2.01%~2.67%; 基于细管模拟结果 (最小混相压力约31MPa), 在M10原始地层压力条件下, CO₂与原油达到近混相状态; 2) 模拟注入CO₂五年, 采用两口井同时以41MPa的井底流压注入CO₂效果最佳, 采收率从34.7%提高到43.4%, 累计产油量从2.22×10⁶m³提高到2.78×10⁶m³; 含水率从约96%降到约59%; 共注入CO₂9.2Mt, 封存6.7Mt, 占注入量的73%, 封存速率约1.33×10⁶t·a^-1; 3) 对于单井注入, 原油采收率与CO₂封存量呈负相关影响, 而两口井注入条件下呈正相关, 因此增加注入井数有助于在提高采收率的同时加大封存量。

关键词: 海上强底水油藏, CO2-EOR-S, 混相驱, 最小混相压力, 组分模型

Abstract:

CO₂ Enhanced Oil Recovery and Sequestration (CO₂-EOR-S) is currently the most effective and economic technology for reducing CO₂ emission from fossil fuels. To evaluate the CO₂-EOR-S potential of M10 oil reservoir in the HZ21-1 oil field, we conducted a compositional simulation using Petrel and CMG-GEM reservoir simulators. We constructed a geological (including structures and facies) model first and then matched the oil production history and simulated CO₂ injection in nine cases with different well patterns and bottom pressures. The results show that 1) the ratio of case number under miscible, near-miscible cases and immiscible conditions is 4︰3︰2, among which miscible flooding has the highest recovery factor (5.48%~8.73%) than the others and the Miscible Minimum Pressure (MMP) in M10 reservoir is about 31 MPa so that CO₂ and oil could be near-miscible with oil under the condition of initial formation pressure; 2) the best case after CO₂ injected five years is two injection wells with injection pressure at about 41 MPa, increasing oil recovery factor and cumulative oil production from 34.7% to 43.4% and 2.22×10⁶to 2.78×10⁶ m³ respectively, while decreasing water cut from 96% to 59% with CO₂ storage volume of 6.7 Mt, which takes 73% of the whole CO₂ injection volume (9.2 Mt), and having a rate of CO₂ storage on 1.33×10⁶ t·a^-1; 3) when CO₂ was injected through one single injection well, the effects on oil recovery factor and CO₂ storage volume would be a negative relation while it would turn to a positive relation through two injection wells, which means more injection wells would increase oil recovery factor and carbon storage volume synchronously.

Key words: offshore oil reservoir with strong bottom water, CO2-EOR-S, miscible flooding, minimum miscible pressure, component modeling

刘雪雁, 李鹏春, 周蒂, 陈广浩. 海上强底水砂岩油藏CO₂-EOR-S数值模拟研究^*[J]. 热带海洋学报, 2017, 36(5): 72-82.

Xueyan LIU, Pengchun LI, Di ZHOU, Jiemin LU, Guanghao CHEN. Simulation of CO₂-EOR-S in an offshore sandstone reservoir with strong bottom water[J]. Journal of Tropical Oceanography, 2017, 36(5): 72-82.

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	油藏	模型	误差/%
平均地层厚度/m	40.2	41.7	4.23
平均孔隙度/%	15.30	15.84	3.53
平均渗透率/μm²	0.205	0.212	3.41

组分	CO₂	C₁	C₂	C₃	C₄	C₅	C₈	C₁₂₊
含量/%	3.09065	47.4423	6.9656	2.6121	2.6121	1.7414	20.3062	15.2297
摩尔质量/(g·mol^-1)	44.01	16.04	30.07	44.10	58.121	72.15	107.00	237.00

编号	注入井	注入压力/MPa	平均地层压力/MPa	驱替机制	注入速率/(PV·a^-1)	注入HCPV
A1	I1	35	29.85	非混相	0.010	0.399
A2	I1	38	30.99	近混相	0.016	0.621
A3	I1	41	33.72	混相	0.023	0.905
B1	I2	35	29.79	非混相	0.009	0.342
B2	I2	38	30.41	近混相	0.012	0.489
B3	I2	41	31.67	混相	0.020	0.789
C1	I1&I2	35	30.94	近混相	0.015	0.594
C2	I1&I2	38	32.26	混相	0.022	0.865
C3	I1&I2	41	34.69	混相	0.031	1.252

编号	采收率/%	采收率提高程度/%	累积CO₂ 注入量/Mt	累积CO₂ 生产量/Mt	CO₂封存量/Mt
A1	36.69	2.01	2.581	0.767	1.814
A2	37.64	2.96	4.241	0.776	3.466
A3	40.16	5.48	6.650	0.984	5.665
B1	37.35	2.67	2.195	1.034	1.161
B2	39.01	4.33	3.293	1.687	1.606
B3	41.41	6.73	5.593	3.298	2.295
C1	38.56	3.88	3.874	1.034	2.840
C2	40.64	5.96	5.969	1.520	4.450
C3	43.41	8.73	9.222	2.558	6.663

海上强底水砂岩油藏CO₂-EOR-S数值模拟研究^*

Simulation of CO₂-EOR-S in an offshore sandstone reservoir with strong bottom water

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