摘要
垦东12平台丛式井组布有28口井,相邻井间距仅为3.5m,其中7口井水平位移超过1 000m,6口井造斜点井深不大于200m。所施工井属于浅层油藏,砂层胶结性差,极其疏松,易导致井径扩大;泥岩中蒙脱石含量高,造浆能力强,易导致缩径及钻井液污染。针对人工岛上布井稠密、井间距小、水平位移大、造斜层软、海水钻井液体系造浆难度大、大井眼浅地层中定向及井身轨迹控制难等特点,采用大井眼浅地层定向、井身轨迹控制、控制井径扩大率及优化海水钻井液等关键性技术,使28口井均达到了工程设计要求,为今后人工岛丛式井组的钻探提供了技术支撑。
There are 28 wells arrayed in the cluster well group of Ken- dongl2 platform,with spacing interval between adjacent wells of 3.5m only.Horizontal migration of 7 wells exceeds 1 000m,and the well depth of deflection point of 6 wells is less than 200m. The wells are characterized by shallow oil reservoir,weak cemen- tation and loose,which easily result in hole enlargement.High content of mudstone montmorillonite and strong pulp-making ca- pacity result in easily hole reduction and polluted drilling fluid. Artificial island has the characteristics of dense well distribu- tion,small well spacing,big horizontal migration,flexible whips- tocking layers,seawater drilling fluid system,large hole in shal- low strata orientation and great difficulty in controlling well traj- ectory.Application of the key techniques as large hole in shallow strata orientation,wellbore trajectory control,well hole enlarge- ment control,seawater drilling fluid drilling,etc.,these 28 wells all achieved the project design requirements,which will provide technical support for drilling the cluster well group in artificial island in future.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2008年第4期91-93,共3页
Petroleum Geology and Recovery Efficiency
基金
"十五"国家重大技术装备研制项目计划"浅海新型单立柱支撑平台研制"(ZZ01-08-02-01)
关键词
丛式井组
海水钻井液钻井
大井眼定向
井身轨迹控制技术
垦东12平台
platform
cluster well group
seawater drilling fluid drilling
large hole in shallow strata orientation
well hole enlargement control
Kendong12 platform
