套管液压举升工具的研制及应用

Development and Application of Casing Hydraulic Lifting Tool

针对传统井筒准备工作存在的不足,研制了套管液压举升工具,并设计了套管回收工艺。通过理论分析,计算了工具的举升能力,校核了液压增力缸、锚定机构和活塞拉杆等部件在工作状态下的强度,研究了锚定机构对套管内壁的应力影响,并对工具不同的应用场景进行了理论及工艺研究,同时在渤海油田对工具进行了现场应用。研究及现场应用结果表明:套管液压举升工具具备3000 kN以上的举升能力,工具各部件可承受举升作业产生的应力载荷,且不会对套管内壁造成损伤;工具可适用于内层套管回收、隔水导管及多层套管回收等多种应用场景,当回收内层套管时,工具可回收2.7~13.0 m长度的胶结套管(以常用的?244.48 mm套管为例),当回收泥线以下多层套管时,可回收20.0 m以上的不同形式的导管/套管组合;割刀+套管捞矛+套管液压举升工具的组合钻具可节省2趟起下钻,较常规套铣回收工艺工期节省约71.3%。所得结论可为该工具的海上大规模应用提供技术支撑。

In view of the shortcomings existed in traditional wellbore preparation,a casing hydraulic lifting tool was developed,and a casing recovery process was designed.By means of theoretical analysis,the lifting capacity of the tool was calculated,the strength of hydraulic booster cylinder,anchoring mechanism and piston rod under working conditions were checked;the stress effect of anchoring mechanism on the casing inwall was studied;the theoretical and technological research on different application scenarios of the tool were carried out;and simultaneously,field application was conducted for the tool in the Bohai Oilfield.The research and field application results show that the casing hydraulic lifting tool has lifting capacity of more than 3000 kN,each component of the tool can withstand the stress load produced by lifting operation,and does not cause damage to the inner wall of the casing;the tool is applicable to various application scenarios such as inner casing recovery,riser recovery and multilayer casing recovery.At the time of recovering inner casing,the tool can recover the cemented casing with the length of 2.7~13.0 m(taking the commonly used?244.48 mm casing for example);at the time of recovering multilayer casing below the mud line,the tool can recover different types of conductor/casing assembly with the length of more than 20.0 m.The combined drilling tool of cutter+casing trip spear+casing hydraulic lifting tool can save 2 trips of tripping,saving 71.3%construction period than the conventional milling recovery process.The conclusions provide technical support for the large-scale application of this tool offshore.