摘要
断溶体油气藏储层类型多样,非均质性极强,常规多重孔隙介质模型以及简单溶洞等势体模型难以广泛应用。文中针对断溶体油藏复杂的地质特征,考虑大溶洞向井筒的垂向窜流以及小尺度缝洞储集体分别向井筒和大溶洞的径向供给作用,建立了双层双重孔隙介质井洞垂向窜流试井解释模型;利用Laplace变换方法获得井底压力解,绘制井底压力典型曲线并划分流动段,对窜流通道传导率、大溶洞半径、裂缝传导系数比等参数进行了敏感性分析。结果表明:窜流通道传导率主要影响早期窜流“下凹”特征,数值过大或过小均会导致早期窜流“下凹”特征减弱甚至消失;大溶洞半径与大溶洞储容比也主要影响早期窜流“下凹”特征,数值越大,“下凹”特征越明显;裂缝系统传导系数比和裂缝储容比主要影响中、晚期的窜流“下凹”特征。该研究结果对复杂断溶体油藏储集体参数评价具有重要意义。
The types of fault-karst reservoir are various and the heterogeneity is very strong,so the conventional multiple pore medium models and simple karst cave equipotential models are difficult to be widely applied.In view of the complex geological characteristics of fault-karst reservoirs,and considering the vertical channeling of large karst cave to the wellbore and the radial supply of small-scale fracture cave reservoirs to the wellbore and large karst cave respectively,a well testing interpretation model of vertical channeling between wellbore and karst cave in double-layer and double-porosity medium is established.The bottom hole pressure solution is obtained by Laplace transform method,a typical bottom hole pressure curve is drawn and the flow section is divided.The sensitivity analysis of parameters such as channeling conductivity,large karst cave radius and fracture conductivity coefficient ratio were analyzed.The results show that the conductivity of the channeling mainly affects the early channeling“concave”characteristics,and too large or too small value will cause the“concave”characteristics of the early channeling to weaken or even disappear.The radius and storage ratio of large karst caves mainly affect the“concave”characteristics of early channeling,and the larger the value,the more obvious the“concave”characteristics.The conductivity coefficient ratio of fracture system and the fracture storage ratio mainly affect the“concave”characteristics of channeling in the middle and late stages.The research results have important practical significance to the evaluation of reservoir parameters in complex fault-karst reservoir.
作者
陶杉
万小勇
邹宁
何辉
刘艳红
袁鸿飞
TAO Shan;WAN Xiaoyong;ZOU Ning;HE Hui;LIU Yanhong;YUAN Hongfei(Northwest Oilfield Company,SINOPEC,Urumqi 830011,China;Key Laboratory of Enhanced Oil Recovery for Carbonate Fractured Vuggy Reservoirs,China Petrochemical Corporation,Urumqi 830011,China;Xi′an Huaxian Petroleum Technology Co.,Ltd.,Xi′an 710065,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2024年第4期684-690,共7页
Fault-Block Oil & Gas Field
基金
中国石化科技部项目“顺北一区5号断裂带提质提速钻完井技术研究”(P20002)。
关键词
断溶体油藏
传导率
大溶洞
窜流
试井解释
fault-karst reservoir
conductivity
large karst cave
channeling
well testing interpretation
