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• 综合研究 •

### 基于渗流-温度双场耦合的油藏型储气库数值模拟

1. 1.中国石油冀东油田公司，河北 唐山 063200
2.成都理工大学能源学院，四川 成都 610059
3.东北石油大学环渤海能源研究院，秦皇岛 河北 066004
• 收稿日期:2022-10-31 出版日期:2023-12-26 发布日期:2024-01-03
• 通讯作者: 刘先山（1993—），男，在读博士研究生，从事储气库数值模拟研究。地址：四川省成都市成华区二仙桥街道东三路1号，邮政编码：610059。E-mail: liuxianshan@stu.cdut.edu.cn
• 作者简介:何海燕（1982—），女，本科，工程师，主要从事储气库建设研究。地址：河北省唐山市路北区新华西道101号冀东油田第一科研楼，邮政编码：063200。E-mail: 63293886@qq.com
• 基金资助:
中国石油勘探与生产分公司2022年重点科技项目“冀东堡古2高挥发性油藏气驱采油与储气库协同建设关键技术研究与试验”(2022ZS0903)

### Numerical simulation of UGS facilities rebuilt from oil reservoirs based on the coupling of seepage and temperature fields

HE Haiyan1(),LIU Xianshan2(),GENG Shaoyang2,SUN Junchang3,SUN Yanchun1,JIA Qian1

1. 1. PetroChina Jidong Oilfield Company, Tangshan, Hebei 063200, China
2. College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
3. Bohai Rim Energy Research Institute, Northeast Petroleum University, Qinhuangdao, Hebei 066004, China
• Received:2022-10-31 Online:2023-12-26 Published:2024-01-03

Abstract:

Peak shaving and supply guarantee are the functions of Underground Gas Storage（UGS）. The accurate prediction of the UGS construction index is related to the number of new wells and investments. When a complex fault block reservoir is transformed into UGS, it encounters three-phase flow（oil, gas, and water） during multi-cycle and high-velocity operations. The petrophysical properties of oil and gas are greatly affected by temperature. Without considering the temperature disturbance after cold gas injection and the additional pressure loss of high-velocity turbulence, the index prediction accuracy of the existing numerical simulation methods for UGS is low. To improve the accuracy of index prediction for a UGS rebuilt from a complex fault block oil reservoir, combined with fluid viscosity-temperature and high-velocity turbulence experiments, a coupled mathematical model of seepage and temperature is established. The model is solved discretely using the Finite Volume Method（FVM）, with a Two-Point Flux Approximation（TPFA） scheme for spatial discretization and a backward （implicit） Euler scheme for temporal discretization. The material balance and pressure of the reservoir and single well in the depletion development stage are matched with high precision. The sensitivity analysis of the UGS operation index is carried out in an example. The results show that the disturbance of the cold gas injection temperature field and high-velocity non-Darcy effect is the main controlling factors of accumulative oil production and gas volume error respectively. The well control temperature range increases logarithmically with the gas injection rate and the water-phase seepage capacity increases when the oil-phase and gas-phase seepage capacity decreases significantly, resulting in the increase of the produced liquid volume and the decrease of formation pressure. The additional pressure drop caused by high-velocity turbulent flow results in some injected natural gas not being produced, leading to an increase in natural gas reserves and pressure over successive cycles.

• TE822