开式抽汲排液中P-T封隔器失封原因分析  

Analysis of failure causes of P-T packer in open swabbing and drainage

作　　者：肖志永 XIAO Zhiyong(Oil Testing and Production Test Branch,PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163412,China)

机构地区：[1]中国石油大庆油田有限责任公司试油试采分公司,黑龙江大庆163412

出　　处：《油气井测试》2021年第5期18-22,共5页Well Testing

基　　金：中国石油集团(股份)公司科研项目“大庆油田致密油层压裂技术攻关及现场试验”(110014318)。

摘　　要：当开式抽汲管柱上顶力不足时,会因活塞效应增加密封端面脱离密封唇的几率而导致P-T封隔器失封。在杏X-X井开式抽汲过程中,P-T封隔器失封,压力监测曲线表现出压力突降至某一数值后不再降低。经分析认为,封隔器上部液体被抽空情况下,抽汲动作所产生的活塞效应是引起失封的直接原因。通过增加机械锁紧装置、增加管柱配重、预留合理方余及监测产量变化等改进措施,下封隔器压力监测显示,P-T封隔器密封良好,作业成功。该分析结果可为开式抽汲排液提供一定的技术借鉴。When the upward force of the open swabbing pipe string is insufficient,the piston effect will increase the risk of the sealing face detaching from the sealing lip,which will lead to the failure of the P-T packer.During the open swabbing process of Well Xing X-X,the P-T packer failed.At the meantime,the pressure monitoring curve showed that the pressure suddenly dropped to a certain value and did not continue to decrease.After analysis,it is believed that the piston effect produced by the swabbing action is the direct cause of the packer′s failure when the liquid above the packer is evacuated.After applying improvement measures such as adding mechanical locking devices,increasing pipe string counterweights,reserving reasonable surplus and monitoring production changes,the pressure monitoring results showed that the P-T packer has achieved a good sealing effect and the operation was successful.The analysis results can provide technical reference for open swabbing and drainage.

关 键 词：试油 开式抽汲 排液 P-T封隔器 失封原因 压力监测 活塞效应 产量 

分 类 号：TE353[石油与天然气工程—油气田开发工程]