| 摘要: |
| 针对海上某油田储层非均质性强、注水强度大,注水突进严重导致储量动用程度低,而常规调剖措施无法有效开展的问题,通过物模驱替实验考察了层内自生CO2提高采收率技术在该油田的可行性,并对注入量、注入方式、注入速度和稳定剂用量等参数进行优化研究。实验结果表明,层内自生CO2技术提高采收率的效果显著,储层渗透率在(200~10 000)×10-3 μm2范围内,采收率可在常规水驱基础上提升28.70%~32.29%,原油黏度在10~500 mPa·s范围内,对层内自生CO2驱油效果基本无影响。技术的最优工艺参数为:注入量1.0 PV,8段塞注入,生气剂和释气剂注入速度比为1∶1,稳定剂用量为0.10 PV。现场试验表明,层内生成CO2提高采收率技术对渤海油田稳油控水起到了显著效果,措施后井组日产油量最高增加100 m3,含水率下降12%,有效期内净增油3826 m3。 |
| 关键词: 海上油田 层内自生CO2 工艺优化 EOR |
| DOI：10.3969/j.issn.1007-3426.2019.06.014 |
| 分类号: |
| 基金项目:2017年天津市留学回国人员择优资助项目“新型控水用纳米复合水凝胶研发”；中海油科研项目“SZ36-1油田层内生成CO2调驱关键技术优化研究及应用”(YSB15YF002) |
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| Research and application of EOR technology by in-situ CO2 generation on offshore oilfield |
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Zheng Yufei, Li Xiang, Xu Jingliang, Liu Wenhui, Zhang Bo, Yu Meng
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Production Optimization, China Oilfield Services Limited, Tianjin, China
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| Abstract: |
| In order to solve the problems of low reserves utilization caused by strong reservoir heterogeneity, high water injection intensity, water injection spurt and conventional profile control measures which could not be effectively carried out in a certain offshore oilfield, application of in-situ CO2 generation enhanced oil recovery technology was investigated by physical model displacement experiment. Then the parameters such as injection volume, injection method, injection speed and the amount of stabilizer dosage were optimized. The results show that the recovery efficiency of in-situ CO2 generation technology is remarkable. In the range of(200-10 000)×10-3 μm2 of reservoir permeability, oil recovery can be increased by 28.70%-32.29% on the basis of conventional water flooding, and in the range of 10-500 mPa·s of crude oil, viscosity has little effect on this technology. The optimum technological parameters are as follows:1.0 PV injection rate, 8 slug injection, injection rate ratio of gas forming and gas yielding is 1∶1, and the amount of stabilizer dosage is 0.1 PV. The field test shows that in-situ CO2 generation enhanced oil recovery technology plays a significant role in stabilizing oil production and controlling water production on offshore oilfield. After adopting this measure, daily oil production increases 100 m3, water cut decreases 12%, and the net oil increases 3826 m3 in effective period. |
| Key words: offshore oilfield in-situ CO2 generation process optimization enhanced oil recovery |
