摘要
涩北气田是国内规模最大的疏松砂岩强水侵气藏,受构造平缓、储层疏松、气层层数多且薄、气水关系复杂等因素影响,开发过程中遭遇气藏水侵严重、砂蚀砂埋和储量动用不均衡等技术挑战。为了保障涩北气田天然气产量,提高天然气采收率并保持长期稳产,开展了地质、气藏、工程技术等多学科一体化攻关研究,系统总结了气田地质特征,梳理了“十二五”以来气田稳产的关键技术,剖析了目前持续稳产面临的挑战,并对今后稳产进行了展望。研究结果表明:①系统梳理、总结了涩北气田地质特征和开发过程中面临的挑战,包括构造、储层、水侵等特征,以及出砂、储量动用不均衡等问题,明确了制约气田稳产难题;②通过持续长期攻关,形成了具有疏松砂岩边水气藏开发特色的砂体动静态精细描述与储量挖潜技术、开发指标监测与动态调控优化技术、水侵与砂患综合防控治理和地面集输净化与数字化等技术;③涩北气田持续稳产难度前所未有,需要以往经验技术为支撑,更需持续深化气藏认识、创新技术工艺以及加强综合应对实施,预计2023—2025年产气量有望保持在850×10 m3/a之上的持续稳产。结论认为,涩北气田稳产关键技术有效保障了气田长期稳产,其经验对其他老气田开发稳产具有借鉴意义,有助于保障国家能源安全。
The Sebei gas field in the Qaidam Basin is the largest unconsolidated sandstone gas pool with severe water intrusion in China.Due to the geological characteristics of gentle structures,loose reservoir rocks,multiple thin layers,and complex gas-water relationship,its development suffers from severe water invasion,sand erosion/burial,and uneven recovery of reserves.To ensure the development of the Sebei gas field with enhanced gas recovery and long-term stable production,through an integrated research on geology,gas reservoir,engineering technology,and other disciplines,this paper clarifies the geological characteristics of the gas field,reviews the stable production technologies that have been developed and applied since the beginning of the 12th Five-Year Plan,and analyzes the challenges for maintaining a stable production.Finally,this paper presents the prospects of stable production.The results show that the stable production of the Sebei gas field is restricted by some geological characteristics(e.g.structure,reservoir rocks,and water intrusion)and development challenges(e.g.sand production,and uneven recovery of reserves).There is a series of development technologies for unconsolidated sandstone gas reservoirs with edge water,including static and dynamic fine sandbody description and potential reserves tapping,development indicator monitoring and dynamic control optimization,water intrusion and sand production prevention and control,and surface gathering purification and digitalization.Moreover,for the stable production of the Sebei gas field,which is unprecedently difficult,further understanding of the gas reservoir,innovative technologies/processes and comprehensive solutions are required,in addition to the experience in previous practices.The annual gas production rate of the gas field is expected to reach and maintain at 50×108 m3 or more in 2023-2025.It is concluded that the existing stable production techn ologies have effectively facilitated the Sebei gas field,with its practice being referential for other gas fields and conducive to the national ener gy security.
作者
宋伟
奎明清
李江涛
王小鲁
刘俊丰
孙勇
温中林
杨国军
谭晓华
SONG Wei;KUI Mingqing;LI Jiangtao;WANG Xiaolu;LIU Junfeng;SUN Yong;WEN Zhonglin;YANG Guojun;TAN Xiaohua(PetroChina Qinghai Oilfield Company,Dunhuang,Gansu 736202,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2023年第12期37-45,共9页
Natural Gas Industry
基金
中国石油天然气股份有限公司科学研究与技术开发项目“复杂天然气田开发关键技术”(编号:2021DJ1705)。
关键词
涩北气田
边水侵入
治水治砂
强水侵气藏
稳产关键技术
老气田稳产
Sebei gas field
Edge water intrusion
Water/sand control
Reservoir with severe water intrusion
Stable production technology
Stable production of mature gas fields
