埕海1-1区浅软地层安全高效通井技术  

Safe and efficient wiper trip technology in shallow soft formation of Chenghai 1-1 oilfield block

作　　者：沈吉阳 程玉琨 王建民 张木楠 LI Qiujun;WAN Yingfeng;LI Shan(Sinosteel Wuhan Safety&Environmental Protection Research Institute Co.,Ltd.,Wuhan Hubei 430081,China)

机构地区：[1]中国石油集团海洋工程有限公司钻井分公司,天津300451

出　　处：《石油工程建设》2024年第S01期14-19,共6页Petroleum Engineering Construction

摘　　要：埕海1-1区块采用水平井开发,主要钻遇地层为明化镇组和馆陶组的松软砂泥岩地层,井眼易蠕变缩径,加之大位移和双增三维轨迹因素,导致该区块二开311.15 mm井眼通井作业风险高,容易划出新井眼。通过设计一种通井领眼钻头,优化通井钻具和通井技术措施,形成了埕海1-1区浅软地层安全高效通井技术,解决了浅软地层通井遇阻易划出新眼、大井斜长稳斜段井眼清洁效果差等难题。现场应用1口井,通井时效提高12.34%,并为区块首口井全漂浮下套管顺利实施提供了良好的井眼条件。该技术对于浅软地层大位移井的安全施工及提速提效具有一定意义。In the horizontal well drilling on the Chenghai 1-1(CH1-1)Block,the formations drilled were mainly soft sandstone strata of the Minghuazhen Formation and Guantao Formation.Creep closure is likely to occur at the wellbore.Meanwhile,factors including double-increase three-dimensional trajectory and large displacement resulted in a high operation risk of second-spud 311.15 mm wellbore drifting and a new hole was likely to appear.By designing a wiper trip pilot bit,optimizing the wiper trip drilling string and technical measures of the wiper trip,safe and efficient drifting technology was achieved for the shallow soft formation of CH 1-1 oilfield block,which solved the problems of the easy-to-appear new hole during tight hole situation in shallow soft formation,and poor downhole cleaning in high-inclination hold section.With on-site application in one well,wiper trip time was saved by 12.34%,and well prepared the wellbore condition for the successful application of full floating casing running in the first well at CH1-1 block.This technology is helpful for safe construction and efficiency enhancementin extended reach wells in shallow soft formation.

关 键 词：埕海1-1区块 浅软地层 大位移井 通井 领眼钻头 

分 类 号：TE52[石油与天然气工程—油气田开发工程]