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Y221型封隔器由于自身设计结构或管柱的配置,以及出砂、套变、落物、结垢等,都易造成封隔器管柱被卡而造成井下事故。为了满足工艺的需要,管柱上同时还配置了金属水力锚,以满足双向锚定的需要,但因油套压差(套压大于油压)、结垢、砂卡等造成水力锚锚抓不能复位,致使管柱被卡。因此对井下工具的配置必须满足下得去、封得牢、分得开、起得出的工艺特点,研制推广了Y241B型封隔器加非金属水力锚分层管柱,对封隔器卡管柱类似事故起到了一定的借鉴作用。
Y221 packer due to its own design structure or the configuration of the column, and sanding, casing change, falling objects, scaling, etc., are likely to cause the packer column is stuck and cause underground accidents. In order to meet the needs of the process, the pipe is also equipped with a metal hydraulic anchor at the same time to meet the needs of bi-directional anchoring. However, due to the differential pressure of the oil jacket (casing pressure greater than oil pressure) Can not be reset, resulting in a stuck pipe. Therefore, the configuration of the downhole tools must meet the next to go, sealed prison, get open, get out of the process characteristics, developed and promoted the Y241B packer with non-metallic hydraulic anchor layered column, the packer card Similar accidents have played a certain role in the string.