The top packer is one of the most important components of the gravel-pack work string.A new type top packer was developed which is characterized by large size (φ152.4 mm).Moreover,this top packer uses the C type single lock-ring mechanism and bidirectional slip anchor to ensure the sealing reliability and reduce the risk of the tubing string to move up and down.Mechanical analyses were conducted for the slip,lock-ring,sub,mandrel,and rubber group of the top packer,and it was found out that all of them meet the requirements.Under the high temperature (165 C) and high pressure,lab setting tests,as well as upward and downward pressurization tests showed that when pressure was raised to 19 MPa (the setting pressure) and maintained for 15 min,the setting could be properly realized;when the pressure was further raised to 46 MPa,the upward and downward pressure can be held for 30 min.A fishing tool was run in to pull the top packer out of hole,showing no rubbers or slips were damaged.The top packer has been pilot tested in 3 wells,both onshore and offshore,and then successfully applied in more than 100 gravel-pack jobs.The good application results suggest that the top packer can be widely used for horizontal well gravel-pack,simple sand control and relevant operations offshore.%顶部封隔器是水平井砾石充填管柱中最重要的组件之一.研制了一种新型顶部封隔器,该封隔器通径大(φ152.4 mm),采用C型单面齿锁环机构和双向卡瓦锚定来保证密封可靠性及降低管柱上下串动的风险.对新型顶部封隔器的卡瓦、锁环、上短节、芯轴、胶筒组等关键零部件进行了力学分析,均能满足要求.高温(165℃)高压室内坐封试验和上、下压试验表明,当加压至坐封压力19 MPa时,保压15 min,坐封正常完成;继续加压至46 MPa时,上、下压试验均能保压30 min;下入回取工具,将封隔器取出套管,胶筒及卡瓦均未损坏.利用新型顶部封隔器在陆上和海上3口井进行了现场试验,均圆满完成作业.新型顶部封隔器目前已成功应用100井次以上,可广泛应用于海上水平井砾石充填、简易防砂及相关技术领域.
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