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过去各油田使用的套管附件,如引鞋、套管鞋、回压阀、阻流环和旋流短节等的结构很不统一,使用中存在许多问题。有的附件分散,使用时串联不便;有的可钻性差,再次开钻时需下专用磨鞋磨除;有的耐温性能差,井下温度较高时失去耐回压性能;有的密封可靠性差,不能憋压候凝,直接影响了水泥石与套管的胶结质量,降低了油气井的使用寿命。华北Ⅰ型浮箍、浮鞋综合了国外浮箍、浮鞋的优点,具有结构紧凑、串接方便、耐回压可靠、容易钻除等特点。
In the past, the casing accessories used in various oil fields, such as shoes, casing shoes, back pressure valves, spoiler rings and swirl knuckles, are not uniform in structure. There are many problems in use. Some attachments scattered, inconvenient to use when in series; some poor drillability, re-opened when the need to wear special grinding shoes worn; some poor temperature resistance, high temperature downhole lost pressure resistance; some sealed and reliable Poor sex, can not hold wait for Hou condensate, a direct impact on the cementing quality of cement and casing, reducing the service life of oil and gas wells. North China Ⅰ-type floating hoop, floating shoes integrated foreign floating hoops, floating shoes advantages, with a compact structure, cascading convenience, resistance to back pressure, easy to drill and so on.