摘要
为了认清文96地下储气库周期注采过程中储气库边水运移特征和对注采运行的影响,开展了边水监测及动态跟踪分析,以气藏数值模拟技术为手段,应用网格粗化技术建立了该储气库的数值模型;利用该数值模型开展了边水运移数值模拟研究,结合注采井实测液面数据,逐步认清了文96储气库周期注采边水运移规律,结合运行动态特征初步评价了边水的活跃程度、影响范围。研究结果表明:(1)文96气藏水驱类型为弱弹性水驱,建库前S2X1-4、8原始气水界面较统一、S3S1-3原始气水界面相差较大;(2)基于边水活动分析研究结果而坚持"高部位强注、低部位缓注""合理控制生产压差"的注采运行原则,从周期液气比变化显示表明文96储气库注气驱水效果整体较好,边水分布更加合理;(3)后期注采运行过程中通过"高注均采""控制压差"等技术措施较好地控制了边水运移,排液扩容效果显著,气库动态库容逐步接近设计库容量。该研究成果将进一步指导文96储气库的注采运行、扩容达产,并对同类型边水气藏储气库注采运行具有借鉴意义。
In order to make clear migration characteristics of edge water in Wen 96 gas storage during cyclic injection-production process and their effect on injection and production, the edge water was monitored and dynamically analyzed. Furthermore, a numerical model was established by means of one technology of numerical simulation and anther technology of grid upscaling. Then, this model was adopted to study the edge-water migration in Wen 96 gas storage. And combined with some liquid-level data measured in injection-production wells, the migration laws in the process of cyclic injection and production were figured out gradually. Finally, based on several performance characteristics,both activity degree and influencing range of edge water were evaluated preliminarily. Results show that,(1) in Wen96 gas reservoirs, their water drive belongs to weak elastic one. Before these reservoirs were rebuilt into a gas storage, S2X1-4 and 8 original gas/water interfaces were relatively consistent whereas S3S1-3interface was more different;(2)according to some analysis on edge-water activity, the injection-production operation principles of "intense injection at high points, slow injection at low points, and rational control of production pressure difference" are adopted. The variation of cyclic liquid/gas ratio shows that, for Wen 96 gas storage, an effect of both gas injection and water displacement is better, and edge-water distribution is more reasonable;and(3) after adopting two technical measures of "intense injection and uniform production" and "pressure difference control" in the late stage of injection, the edge-water migration is under better control, the liquid drainage and storage capacity obtain a remarkable expansion effect, and the dynamic storage capacity approaches to the designed capacity gradually. The conclusion can provide not only further guidance for the injection-production operation and the capacity expansion to reach one production target, but also reference for this operation of other gas storages rebuilt
作者
腰世哲
Yao Shizhe(Sinopec Yu-Ji Gas Pipeline Company Limited,Puyang,Henan 457001,China)
出处
《天然气技术与经济》
2019年第6期56-61,共6页
Natural Gas Technology and Economy
基金
中国石化“枯竭气藏型储气库安全保障及优化运行技术”项目（编号：35150000-14）
关键词
地下储气库
边水
水侵量
数值模拟
气水界面
库容
Gas storage
Edge water
Water influx
Numerical Simulation
Gas/water interface
Storage capacity
