摘要
玛湖砾岩油藏上乌尔禾组井段地层非均质性强、井壁易坍塌;佳木河组层段可钻性差,且微裂缝发育导致井漏频繁;钻速时效相对较慢,井身结构复杂,钻完井周期长。针对上述技术难点,以玛湖凹陷金龙2井区为例,在地质岩性特征上综合考虑地层压力体系、钻井复杂情况、钻井成本等因素,提出了钻井液性能优化、井身结构优化、优选孕镶PDC混合钻头技术等方案。现场实践表明,金龙2井区上乌尔禾组泥岩段单井平均扩径率由45.2%降为13.8%,上乌尔禾组油藏水平井单井钻完井周期缩短50.5%;佳木河组水平段平均单井井漏次数减少73.7%,平均单井漏失量减少94.3%,佳木河组水平段机械钻速提高55.4%。研究成果为玛湖砾岩油藏水平井安全、高效完钻提供理论支撑,对玛湖500万t产能建设具有重要意义。
The drilling interval of the Upper Wuerhe Formation of the Mahu conglomerate oil reservoir has high heterogeneity and is prone to collapse.Moreover,the drilling interval of the Jimuhe Formation suffers from low drillability and frequent lost circulation caused by well-developed microfractures.The rate of penetration(ROP) is low,the casing program is complex,and the cycle of drilling and well completion is rather long.Given the above technical difficulties,with the Jinlong-2 well district in the Mahu sag as an example,the plans to optimize the drilling fluid performance and casing program and introduce impregnated PDC hybrid bits were proposed after comprehensive analysis of the geology,lithology,formation pressure system,drilling complexities,and drilling cost.The field application shows that,in the Upper Wuerhe Formation mudstone in the Jinlong-2 well district,the average reaming ratio of wells is reduced from 45.2% to 13.8%,and the drilling/completion period per well is shortened by 50.5%;in the Jiamuhe Formation,the average lost circulation count of wells in horizontal section is decreased by 73.7%,the average volume of lost circulation is reduced by 94.3%,and the ROP is improved by 55.4%.This research provides theoretical support for safe and efficient drilling/completion of horizontal wells in the Mahu conglomerate oil reservoir,and it is highly valuable for building the production capacity of 5 million tons in the Mahu area.
作者
黄洪林
李军
高热雨
杨宏伟
刘楷
蒋振新
HUANG Honglin;LI Jun;GAO Reyu;YANG Hongwei;LIU Kai;JIANG Zhenxin(China University of Petroleum(Beijing),Beijing 102249,China;Karamay Campus of China University of Petroleum(Beijing),Karamay 644000,Xinjiang,China;CNPC Drilling Engineering Technology Research Institute,Beijing 102249,China;Hainan Branch of CNOOC(China)Limited,Haikou 570100,Hainan,China;PetroChina Xinjiang Oilfield Company,Karamay 644000,Xinjiang,China)
出处
《石油钻采工艺》
CAS
北大核心
2022年第2期153-160,共8页
Oil Drilling & Production Technology
基金
中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项“准噶尔盆地玛湖中下组合和吉木萨尔陆相页岩油高效勘探开发理论及关键技术研究”(编号:ZLZX2020-01)。
关键词
玛湖砾岩油藏
地层压力体系
井壁稳定
钻井速度
钻完井周期
井身结构优化
钻头优选
Mahu conglomerate oil reservoir
formation pressure system
wellbore stability
rate of penetration
drilling/completion period
casing program optimization
bit selection
