注采过程中气质流体置换数值模拟及原地气置换方法——以新疆H储气库为例  

Numerical simulation of gaseous fluid displacement and in⁃situ gas displacement method in injection⁃production process:Taking Xinjiang H gas storage as an example

作　　者：廖伟 刘国良 李欣潞 张赟新 郑强[1] 曹锡秋 胥洪成[2,3] LIAO Wei;LIU Guoliang;LI Xinlu;ZHANG Yunxin;ZHENG Qiang;CAO Xiqiu;XU Hongcheng(Operation District of Hutubi Gas Storage,PetroChina Xinjiang Oilfield Company,Karamay 834099,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;CNPCKey Laboratory of Oil&Gas Underground Storage Engineering,Langfang 065007,China)

机构地区：[1]中国石油新疆油田公司呼图壁储气库作业区,新疆克拉玛依834099 [2]中国石油勘探开发研究院,北京100083 [3]中国石油天然气集团有限公司油气地下储库工程重点实验室,河北廊坊065007

出　　处：《大庆石油地质与开发》2023年第4期81-89,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重大科技专项“地下储气库地质与气藏工程关键技术研究与应用”(2015E-4002)。

摘　　要：凝析气藏型储气库在注入干气后与原地气不断置换,组分和相态发生变化,对其深入研究是储气库注采优化控制、实现高效运行的关键。以新疆H储气库为研究对象,通过建立重力控制下的组分梯度分布模型,定量分析了多周期注入气在储层中的扩散特征、采出气组分变化及凝析油含量变化规律。结果表明:先期高部位注气及强注弱采有利于原地气被驱离近井地带;其后高部位采注比高,原地气置换彻底,低部位采注比低,重组分富集在低部位及气库西侧;单井凝析油含量变化特征受构造部位、注采策略、投产方式等因素综合影响;单井吞吐使原地气置换能力降低,凝析油采出能力随之降低;循环注气方式、以采投注、短期较高采注比均有利于含重组分的原地气加速置换。研究成果可为同类贫凝析气藏改建储气库的设计、注采运行制度的制定及现场调控等提供一定的理论指导。Frequent displacements between injected dry gas and in-situ gas in condensate gas reservoir based under‑ground gas storage lead to alterations of component composition and phase state.Further study is essential to opti‑mize injection-production control and achieve efficient operations.Taking Xinjiang H gas storage as research ob‑ject,by establishing model of component gradient distribution controlled by gravity,diffusion characteristics of multi-cylce injected gas in reservoirs and alteration laws of produced gas components and condensate oil content are quantitatively analyzed.The results show that:Gas injection in structural high and strong-injection and weak-pro‑duction at early stage is favorable for in-situ gas displaced away from near-well zone,and then in-situ gas is dis‑placed completely at high production-injection ratio in structural high and heavy components are enriched in struc‑tural low and west side of gas storage at low production-injection ratio at low production-injection ratio.Variation characteristics of single well condensate oil content is influenced comprehensively by structural positions,injection-production strategy and production commencing mode.Single well huff-puff reduces in-situ gas replacement capabili‑ty,as well as condensate oil productivity.Cyclic gas injection,putting new well into production during gas recovery stage and high production-injection ratio in short term are all beneficial to accelerate the displacement of in-situ gas with heavy components.The research provides theoretical guidance for reconstruction of lean condensate gas reser‑voir into underground gas storage,injection-production operation system and field control.

关 键 词：储气库 注采交互驱替 组分模型 流体置换 组分变化 凝析油含量 

分 类 号：TE972[石油与天然气工程—石油机械设备]