尼日利亚边际油田钻井实践及思考  

Nigeria's Stubb Creek Marginal Oilfield Drilling Practice and Thinking

作　　者：冯江鹏[1] 郭和明[2] 肖超[1] 田璐[1] 邢树宾[1] 

机构地区：[1]中国石化石油工程技术研究院,北京100101 [2]中国石化国际石油勘探开发有限公司,北京100083

出　　处：《石油钻探技术》2010年第5期86-89,共4页Petroleum Drilling Techniques

摘　　要：尼日利亚Stubb Creek边际油田的S5井在钻井过程中,井下复杂情况频繁出现,导致二开侧钻3次,三开又因键槽卡钻无法解卡再次侧钻。分析认为其原因为:地层软泥岩水敏性极强;硬脆性泥岩坍塌压力高,掉块严重;钻井液性能不能满足安全钻井的要求;定向井段井眼轨迹控制得不好,井身质量差;钻井主承包商人员经验不足。该油田在后续井的钻井中有针对性地采取了以下措施:用合成基钻井液替代水基钻井液;提高钻井液密度;控制井眼轨迹,提高井身质量;优选钻头;更换服务商和现场服务人员。后续的4口井由于采取了以上技术措施,保证了井下安全,有效提高了钻井速度,缩短了钻井周期,加快了Stubb Creek边际油田的勘探开发速度。During the drilling of Well S5 in Nageria’s Stubb Creek marginal oilfield,downhole complicated conditions occurred frequently and resulted in 3 sidetracks in second spud,and sidetrack in third spud due to pipe stuck.The analysis shows that the main reasons are the extremely water-sensitive soft mudstone formation,brittle mudstone with high collapse pressure,serious collapse during drilling,drilling fluid which cannot meet the safety requirements,poor well trajectory control during directional drilling,poor wellbore quality,and low technical level of prime contractor personnel.The following measures were used in follow up wells,including using synthetic drilling fluids instead of water based drilling fluids,increasing mud density,improving wellbore trajectory and wellbore quality,using drill bit suitable for this formation,and replacing service provider and field service personnel.The applications of all these in the follow up 4 wells ensured the well safety,improved the ROP,shortened the drilling cycle and accelerated the exploration and development pace of Stubb Creek marginal oilfields.

关 键 词：钻井 事故处理 合成基钻井液 井眼轨迹 尼日利亚 Stubb Creek边际油田 S5井 

分 类 号：TE28[石油与天然气工程—油气井工程]