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温敏凝胶封窜辅助多元热流体吞吐研究与应用
油田化学
2018年 35卷 第1期
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Title
Research and Application of Thermal Thickening Gel Profile Control Assisted Multiple Thermal Fluid Huff and Puff
Authors
WANG Cheng, SUN Yongtao, WANG Shaohua, MEI Wei
摘要
针对多元热流体吞吐过程中水平井出现气体窜流问题, 考察了以纤维素醚为主要成分的温敏凝胶的静态与动态成胶温度、 流变性、 粘弹性、 封堵性能及提高驱油效果。研究表明, 温敏凝胶的静态成胶温度为65℃, 动态成胶温度为 70℃。质量分数为 1.5%的温敏凝胶在 80℃、 定频率 0.5 Hz下弹性模量在 30~40 Pa, 黏性模量在 2.5~7.5 Pa。注入量 0.6 PV、 质量分数 1.5%的温敏凝胶对热水和多元热流体在渗透率 13.08、 3.2 μm2的岩心的封堵率分别为 99.7%和 98.85%; 温敏凝胶最经济、 有效的注入量为 0.6 PV, 可提高多元热流体驱油效率 16.2%。现场使用温敏凝胶封窜工艺可提高注热压力 2.5~4.5 MPa, 整个注热作业期间未发生气窜, 周围邻井生产未受到影响, 平均日产油量40 m3, 较注入温敏凝胶前平均日产油量增加42.8%。图6表3参13
Abstract
As for gas channeling happened in horizontal well during multiple thermal fluids huff and puff, the properties of thermal thickening gel(TTG), containing cellulose ether as main component, such as static and dynamic gelling temperature, rheological and viscoelastic properties, plugging performance and enhancing oil displacement efficiency were measured. The results indicated that the gel static and dynamic gelling temperature of the TTG was 65℃ and 70℃, respectively. In environment of 80℃ and 0.5 Hz frequency, the elasticity modulus and viscous modulus of TTG with mass fraction of 1.5% could reach 30—40 Pa and 2.5—7.5 Pa, respectively. When adding 0.6 PV TTG aqueous solution with mass fraction of 1.5% , the plugging ratio of gel to hot-water and multiple thermal fluid in core permeability of 13.08 μm2 and 3.2 μm2,respectively,was 99.7% and 98.85% ,respectively. The optimized gel injection was 0.6 PV, and the displacement efficiency could be improved by 16.2%. After thermal thickening gel sealing technology was used on site, the injection pressure increased by 2.5—4.5 MPa, and the producing wells around heat injection well were not affected during thermal fluid injection period. The well average daily oil production was 40 m3, and increased by 42.8% compared with that before injection thermal thickening gel work.
关键词:
稠油热采;
多元热流体;
温敏凝胶;
气体窜逸;
Keywords:
heavy oil thermal recovery;
multiple thermal fluids;
thermal thickening gel;
gas channeling;
DOI
10.19346/j.cnki.1000-4092.2018.01.020