碳酸盐岩缝洞型油藏产能评价方法探讨  

Discussion on deliverability evaluation method of fractured-vuggy carbonate reservoir

作　　者：王禹川[1] 王怒涛[1] 袁晓满[2] 陈晖[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油塔里木油田分公司开发事业部,新疆库尔勒841000

出　　处：《断块油气田》2011年第5期637-640,共4页Fault-Block Oil & Gas Field

基　　金：中国石油塔里木油田公司重大科研项目"哈拉哈塘地区哈六区块碳酸盐岩油藏试采动态特征分析"(97101102004)

摘　　要：碳酸盐岩缝洞型油藏非均质性强,储集空间多样,应用常规产能指标对其进行产能评价具有诸多困难,如井底流压不易准确获得,地层压力下降较快且分布不均等,求取的采油指数也无法真实反映单井的生产能力。因此,建立了一种简单实用的碳酸盐岩缝洞型油藏产能评价方法,根据大量统计资料,经线性回归,得出产量与井口油压的经验关系式,其斜率定义为产能系数,反映了产量对油压的依赖程度,也反映了单井生产能力的大小。结合碳酸盐岩缝洞型油藏生产特征,建立了产能评价标准,按产能系数大小将单井产能划分为4级:大于8 t/(d·MPa)为高产能井,6～8 t/(d·MPa)为中等产能井,4～6 t/(d·MPa)为低产能井,小于4 t/(d·MPa)为特低产能井。对哈六区块3类典型单井进行了实例分析,评价结果与实际情况相符,应用效果较好。There are some actual difficulties in deliverability evaluation of fractured-vuggy carbonate reservoir with conventional capacity index due to its severe heterogeneity and space types of various reservoir, such as not easy to get bottom hole flowing pressure precisely, reservoir pressure declines fast and distributes nonuniformly. According to numerous oilfield data, a simple and practical deliverability evaluation method is established in this paper. An output-pressure empirical correlation is obtained via linear regression, its slope is defined as deliverability factor, which reflects the dependency of productivity on wellhead pressure and the productivity of single well. The evaluation rule is forwarded referring to the production characteristics of fractured-vuggy carbonate reservoir. The well productivity can be compartmentalized into 4 grades based on the deliverability factor：, higher than 8 tons per Megapascal and per day as high yielding well, 6-8 tons per Megapascal and per day as medium yielding well, 4-6 tons per Megapaseal and per day as low yielding well and less than 4 tons per Megapascal and per day as ultra-low yielding well. A case study on three type wells in Block Ha 6 is conducted and the evaluation result is consistent with practice, showing a good performance.

关 键 词：碳酸盐岩 缝洞型油藏 产能评价 产量 产能系数 

分 类 号：TE331[石油与天然气工程—油气田开发工程]