海上热采非凝析气体窜逸数模表征与应用

Numerical Simulation Characterization and Application of Interwell Non Condensate Gas for Offshore Thermal Recovery

张华 刘昊 张宝青 邹剑 王秋霞 蔡云

ZHANG Hua LIU Hao ZHANG Baoqing ZOU Jian WANG Qiuxia CAI Yun

中海石油(中国)有限公司天津分公司, 天津 300459

Bohai Oilfield Research Institute, CNOOC Ltd, Tianjin Branch, Tianjin 300459, China

多元热流体吞吐技术在渤海稠油油藏应用取得了良好的开发效果。然而，随着开发程度不断提高，出现了较明显的井间气窜现象，较大地影响了多元热流体的吞吐整体效果。针对渤海复杂断块稠油多元热流体吞吐过程中出现的井间非凝析气体窜逸现象，开展数值模拟表征研究，应用CMG-STARS软件，以油藏实际数据建立井间窜逸模型，从油藏基础、开发方式以及注热参数三个角度探索分析非凝析气体窜逸程度的影响因素；同时，通过多参数的敏感性分析，筛选出影响程度最大的关键因素。研究表明：油藏油层厚度、水平井布井纵向位置以及注入气水比大小是影响窜逸程度的关键因素，分析结果对制定非凝析气体窜逸治理方案具有指导意义。

Good development results have been achieved since the application of multiple thermal fluids huff and puff technology in Bohai heavy oil reservoirs. However, with the increasing degree of development, there is a more obvious phenomenon of interwell gas channeling, which greatly affects the overall effect of multiple thermal fluids huff and puff. Aiming at the problem of interwell non condensate gas channeling during the multiple thermal fluid in Bohai complicated fault-block oilfield, a mathematical model representation is researched in this paper by using numerial simulation software CMG-STARS for the establishment of interwell gas channeling model based on the in-situ data from the reservoir. Influence factors of gas channeling degree are analyzed from the aspects of reservoir basis, development modes and thermal injection parameters. Meanwhile, key factors that influence gas channeling degree most are screened out by way of multi-parameter sensitivity analysis. The research results show that the reservoir thickness, the vertical position of horizontal well and gas water ratio are the key factors affecting the degree of channeling. The analysis results play a guiding role in the development of non-condensate gas channeling treatment program.

https://doi.org/10.3969/j.issn.1008-2336.2019.01.040