封隔式免钻尾管悬挂器的研制与应用  

Development and application of a packer-type drilling-free liner hanger

作　　者：唐欣 钱斌 李斌[1] 刘运楼 张毅超 

机构地区：[1]中国石油川庆钻探工程有限公司井下作业公司

出　　处：《天然气工业》2014年第5期118-125,共8页Natural Gas Industry

基　　金：中国石油天然气集团公司2011年统筹项目(编号:2011T-0501)

摘　　要：在尾管固井作业过程中,普通悬挂器需要后期钻除上部水泥塞及其内部构件,容易造成喇叭口窜气和固井质量变差。为此,开发了新型的封隔式免钻尾管悬挂器,同时还设计了液压坐封控制的封隔器、活动密封免钻柔性密封盒、辅助承载倒扣机构。施工作业顺序为:①将尾管管柱下入到设计位置,充分循环钻井液后,投入憋压球,待其入座后,憋压剪断悬挂控制销钉,实现悬挂器坐挂;②继续憋压,剪断球座销钉,建立循环;③下放钻杆给悬挂器施压,正转倒扣,实现送入工具与悬挂器的丢手;④注水泥施工结束后,投入钻杆胶塞,剪断空心套管胶塞的脱手控制销钉,再继续下行与碰压总成碰压;⑤卸掉水泥头接方钻杆,重新憋压,缓慢上提钻具,由液压对封隔器总成坐封液缸作用,剪断坐封控制销钉,实现封隔器的坐封;⑥起送入工具至喇叭口,循环洗出多余的水泥浆,实现全井免钻。在BQ203-H1等井127mm尾管的成功使用表明,该封隔式尾管悬挂器坐挂、倒扣方便,碰压准确,坐封方便,封隔性能良好。In liner cementing, it is necessary to drill out the upper cement plug and inner components of a common hanger, which will result in a poor cementing quality or even gas leakage at the flare opening, so a new packer-type drilling-free liner hanger was thus innovated, accompanied by the design of a hydraulic setting-control packer, a flexible drilling-free seal box, and an auxiliary bearing back-off mechanism. Specific operation steps were described as follows. First, to run in the liner string to the designed position, fully circulate the drilling fluid, put into the tripping ball, and cut off the hanging control pin by holding the pressure to make the hanger set down. Second, to continue to hold the pressure and cut off ball seat pin to form a circulating process. Third, to trip in the drill pipes to exert pressure on the hanger, turn upside down to run in tools and release the hanger. Fourth, to lower the drill pipe plug upon the completion of cement injection, cut off the releasing control pin of hollow casing plug, and continually run in to realize pumping with the pumping assembly. Fifth, to remove the cement plug and connect the Kelly, hold the pressure again then slowly pick up the drill tools, exert hydraulic pressure on the setting hydraulic cylinder of the packer assembly, and cut of the setting control pin to set down the packer. Finally, to run in the tools to the flare opening and wash out excessive cement slurry by circulating to make the whole hole free of drilling. The successful application of a Ф127 mm liner in such wells as BQ203-H1 indicates that the packer-type liner hanger is featured by easy hanging, setting, and back-off, accurate pumping, simple setting-down, and sound sealing performance.

关 键 词：易窜 易漏 回流 封隔器 免钻 尾管悬挂器 固井质量 

分 类 号：TE256[石油与天然气工程—油气井工程]