伊拉克Missan油田BU区块钻遇盐膏层超高压流体圈闭的钻井技术探讨  

Exploration of drilling techniques for ultra-high pressure fluid traps in salt gypsum layers encountered during drilling in the BU block of the Missan oilfield in Iraq

作　　者：苏振 Su Zhen(China Oilfield Services Ltd.(Integrated Solution&New Energy),Tianjin 300450)

机构地区：[1]中海油服一体化和新能源事业部,天津300450

出　　处：《石化技术》2024年第3期123-125,共3页Petrochemical Industry Technology

摘　　要：伊拉克Missan油田复合盐膏层段含高压盐水层,其中BU区块某井12-1/4"井段钻遇含有超高压流体圈闭,使得本井段作业无安全钻井液密度窗口,作业中气侵、盐水溢流、井漏、缩径等井下复杂频出。后续钻进期间采取严格的ECD控制技术,简化钻具组合并优化参数;非钻进期间分层浆柱稳定井眼,分段控制起下管柱速度等措施,避免了局部超高压流体地层导致的涌、漏、卡等井下复杂,保障了井眼作业安全,积累了油田内相同井况的作业经验,同时也为其他油田同类地层提供了作业思路。The Missan Oilfield in Iraq contains high-pressure brine layers in the composite saline layer section,in which the 12-1/4"section of a well in the BU block was drilled through ultra-high-pressurefluid traps,which made the operation of this section of the well without a safe drillingfluid density window,and the downhole complexities,such as gas intrusion,brine overflows,leakage,and tight hole,were frequently occurred during the operation.During subsequent drilling,strict ECD control technology was adopted to simplify the combination of drilling tools and optimize the parameters;during non-drilling time,the borehole was stabilized by layered slurry columns,and the speed of RIH/POOH was controlled in sections,which avoided the downhole complications caused by local ultra-high-pressurefluid formations such as surging,leaking and stuck,and ensured the safety of the borehole operation,and accumulated the operation experience of the same well condition in the oilfield,and also provided the operation ideas for the same kind of formations in other oilfields.

关 键 词：复合盐膏层 超高压流体圈闭 溢漏同层 ECD控制 缩径 

分 类 号：TE24[石油与天然气工程—油气井工程]