缝洞型碳酸盐岩油藏注氮气提高采收率技术  

Nitrogen Injection Technology for Improved Oil Recovery in Fractured-vuggy Carbonate Reservoirs

作　　者：佘治成 陈利新[1] 徐三峰 肖云 张键[1] SHE Zhicheng;CHEN Lixin;XU Sanfeng;XIAO Yun;ZHANG Jian(Donghe Oil and Gas Production Management Area,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China;Oil and Gas Field Capacity Construction Division,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油塔里木油田公司东河采油气管理区,新疆库尔勒841000 [2]中国石油塔里木油田公司油气田产能建设事业部,新疆库尔勒841000

出　　处：《西南石油大学学报（自然科学版）》2024年第4期138-148,共11页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：哈拉哈塘奥陶系油藏是典型的缝洞型碳酸盐岩油藏,岩溶储层发育,储层储渗空间主要由大小不等的溶洞、溶蚀孔洞和裂缝组成,宏观上离散,局部连续,储集体空间多尺度,缝洞体空间形态及分布复杂。水驱是这类油藏最主要的开发方式,经过15 a开发,注水失效单井和单元逐年增多,水驱失效后,注气成为缝洞型碳酸盐岩油藏提高采收率的最重要手段,注气提高采收率技术在哈拉哈塘进行了现场试验和推广应用,并且建立了6因素注气选井标准,从岩溶背景、井储关系、钻揭深度、储量规模、生产动态及剩余油类型等6个方面选井,依据注气时机、注气方式、注气量、焖井时间及指示曲线等5个方面进行注气参数设计,取得了一些注气选井原则和注气参数设计的初步认识,以期为缝洞型碳酸盐岩油藏注气开发提供参考。The Ordovician reservoir in Halahatang is a typical fractured-vuggy carbonate reservoir.The karst reservoir is well developed,and the reservoir permeability space is mainly composed of karst caves,dissolution holes and fractures of different sizes,which are discrete in general,locally continuous,multi-scaled in reservoir collective space,and complex in morphology and distribution.Water injection and displacement are the most important development methods for this type of reservoir.After 15 years of development,the number of single wells and units with water injection failure is increasing year by year.After water flooding failure,gas injection becomes the most important means of fractured-vuggy carbonate reservoir extraction.The gas injection extraction technology has been tested and applied in Halahatang.And the six-factor gas injection well selection standard has been established.The wells are selected from six aspects,including karst background,wellreservoir relationship,drilling depth,reserve scale,production dynamics,and remaining oil type.The gas injection parameters are designed according to five aspects,including gas injection timing,gas injection method,gas injection volume,stewing time,and indicator curve.Some preliminary understandings of gas injection well selection principles and gas injection parameters design have been obtained,which is hoped to provide reference for gas injection development of fractured-vuggy carbonate reservoir.

关 键 词：岩溶储层 局部连续 水驱失效 注气提高采收率 注气参数 

分 类 号：TE357[石油与天然气工程—油气田开发工程]