不压井作业技术在金坛盐穴储气库中的应用

Application of no-killing operations in Jintan cavern underground gas storage

李祥 李久林

LI Xiang LI Jiulin

西气东输管道公司储气库项目部，江苏金坛　213200

Gas Storage Project Department, West-east Gas Pipeline Company, Jintan 213200, China

西气东输金坛盐穴地下储气库已有采卤溶腔单井（腔）注气排卤作业结束后，在投入正常注采气运行前，为确保?177.8 mm 注采气管柱通畅和注采气能力满足需求，以及井下安全阀在紧急情况下开关控制自如，需将仅用于排卤作业的?114.3 mm 管柱全部起出。鉴于金坛盐穴地下储气库的井（腔）的独特腔体、井身与管柱结构和较高的井口压力，决定采用不压井作业设备将?114.3 mm 排卤管柱一次性起出。该设备具备举升和运输能力的撬装，靠修井机、不压井作业辅助机和桥塞或堵塞器的相互配合来实现带压环境下起下管柱作业。采用不压井作业技术在金坛盐穴地下储气库进行了5 口井（腔）的施工，成功率100%，为金坛盐穴地下储气库后续不压井起同类大直径管柱作业储备了技术，具有一定的指导意义。

After the operation of single cavern gas injection and withdraw in existing brine-extracted caverns of Jintan cavernunderground gas storage, and before being put into normal operation, the ?114.3 mm pipes only used for brine discharge need to betripped out. This can keep the gas injection/production pipe unobstructed and injection/production capacity meeting the need, and flexiblecontrol of downhole safety valve under emergency situations. Due to the unique cavity, casing program, string structure and higherwellhead pressure of the well（cavern） in Jintan cavern underground gas storage, we decided to use snubbing unit for tripping out the?114.3 mm pipe for one time. This unit has lifting and transportation capacity, and depends on the coordination of workover rig, auxiliaryequipment and bridge plug or blanking plug to realize tripping in/out with pressure. No-killing operations in 5 wells achieved success rateof 100% in Jintan cavern underground gas storage, providing technical support for similar big diameter pipe trip out.