深水碳酸盐岩油藏高含CO2产出气回注驱油实验研究
Experimental study on enhanced oil recovery in deepwater carbonate reservoirs via reinjection of high-CO2 produced gas
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- 引用格式:
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李云波,刘成彬,叶禹,杨朝蓬,余洋,李剑.深水碳酸盐岩油藏高含CO2产出气回注驱油实验研究[J].天然气与石油,2024,42(6):57-65.doi:10.3969/j.issn.1006-5539.2024.06.007
LI Yunbo, LIU Chengbin, YE Yu, YANG Zhaopeng, YU Yang, LI Jian.Experimental study on enhanced oil recovery in deepwater carbonate reservoirs via reinjection of high-CO2 produced gas[J].Natural Gas and Oil,2024,42(6):57-65.doi:10.3969/j.issn.1006-5539.2024.06.007
- DOI:
- 10.3969/j.issn.1006-5539.2024.06.007
- 作者:
- 李云波1,2 刘成彬1,3 叶禹1 杨朝蓬1,2 余洋1,2 李剑1,2
LI Yunbo1,2, LIU Chengbin1,3, YE Yu1, YANG Zhaopeng1,2, YU Yang1,2, LI Jian1,2
- 作者单位:
- 1. 中国石油国际勘探开发有限公司, 北京 100034; 2. 中国石油勘探开发研究院, 北京 100083; 3. 中国石油巴西公司, 巴西 里约热内卢 22250040
1. China National Oil and Gas Exploration and Development Corporation, Beijing, 100034, China; 2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, China; 3. PetroChina Brazil Company, Rio de Janeiro, 22250040, Brazil
- 关键词:
- WAG;物理模拟;相似准则;驱油效率
WAG; Physical modeling; Similarity criteria; Oil displacement efficiency
- 摘要:
- 深水碳酸盐岩M油藏气油比高达200～350
m3/m3,产出气中CO2含量超过40%。为减少碳排放,充分利用产出气的高含CO2烃类气体提高驱油效率,开展了模拟储层条件的连续气驱、水驱和水气交替(WaterAlternatingGas,WAG)驱驱油实验,分析研究了不同驱替方式的驱油效率、岩心非均质性、注气速度、注入压力对WAG驱驱油效果的影响规律。研究结果表明:WAG驱驱油效率最高可达71.88%,连续气驱驱油效率为56.83%,分别较水驱(驱油效率为42.08%)高29.8个百分点和14.75个百分点；岩心非均质性、注气速度、注入压力对WAG驱驱油效率具有较大影响,岩心非均质性越强,控水和延缓气窜效果越差,驱油效率越低;高于合理的速度注气,见气时刻提前,最终驱油效率降低;注入压力应满足混相驱条件,有利于提高驱油效率。研究结果为深水碳酸盐岩油藏利用高含CO2产出气WAG驱驱油提供了依据。
In one deepwater carbonate M reservoir, the gas-oil ratio is as high as 200~350 m3/m3, and the produced gas contains over 40% CO2. To reduce carbon emissions and fully utilize the high-CO2 produced gas to enhance oil recovery efficiency, this study conducted continuous gas injection, water flooding, and water alternating gas (WAG) injection, experiments under simulated reservoir conditions. It further analyzed the oil displacement efficiencies of different displacement methods and the impacts of core heterogeneity, gas injection rate, and injection pressure changes on the effectiveness of WAG injection. The results indicate that WAG injection achieves the highest oil displacement efficiency, up to 71.88%, followed by continuous gas injection at 56.83%. These are respectively 29.8 and 14.75 percentage points higher than water flooding, which has an oil displacement efficiency of 42.08%. Core heterogeneity, gas injection rate, and injection pressure significantly influence the oil displacement effectiveness of WAG injection. Greater core heterogeneity leads to poorer water control and delayed gas breakthrough, resulting in lower displacement efficiencies. Injection gas at a rate higher than the optimal level can cause premature gas breakthrough, ultimately reducing recovery. Additionally, maintaining injection pressure within the miscible displacement conditions is beneficial for improving oil displacement efficiency. This study provides a basis for utilizing high-CO2 produced gas in deepwater carbonate reservoirs through WAG injection to enhance oil recovery.
