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    • 22. 发明授权
    • Apparatus and method for placing and for backwashing well filtration
devices in uncased well bores
    • 用于将井过滤装置反洗在未井井中的装置和方法
    • US5332045A
    • 1994-07-26
    • US1020
    • 1993-01-06
    • Colby M. RossHenry L. Restarick
    • Colby M. RossHenry L. Restarick
    • E21B23/04E21B23/06E21B33/12E21B33/126E21B33/1295E21B34/00E21B37/08E21B43/04E21B43/10
    • E21B43/10E21B23/04E21B23/06E21B33/1208E21B33/126E21B33/1295E21B37/08E21B43/04E21B2034/005
    • An earth well completion apparatus and method wherein a work string equipped for jet washing downhole filtration devices, such as well screens and for back washing said downhole filtration devices and containing multiple ball catcher subs which utilize the same drop ball to prevent the inadvertent operation of hydraulically powered tools as well as to permanently valve closed a portion of said work string is concentrically disposed in a production string and run in said well simultaneously. Said ball catcher sub which prevents the inadvertent actuation of said hydraulically operated tools is contained within the main fluid bore of said work string and has an expellable inner collar with an outwardly biased catcher ring which, when expelled, shears hollow shearable means thereby actuating said tool. Expansion of said catcher ring frees said drop ball to fall into a catcher sub which has a retention groove milled into its inner circumference into which said drop ball extrudes thereby preventing its expulsion due to back pressure.
    • 一种地井完井设备和方法,其中装备有用于喷射清洗井下过滤装置(例如井眼筛网)和用于后清洗所述井下过滤装置并包含多个捕集器的工作串,其利用相同的落球来防止液压的无意操作 动力工具以及永久阀关闭,所述工作串的一部分同心地设置在生产线中并同时在所述井中运行。 防止所述液压操作工具意外致动的所述止球器sub包含在所述工作串的主流体孔内,并且具有可向外偏移的捕获环的可驱动的内部套环,当被排出时,该夹套可以被中空的可剪切装置剪切,从而致动所述工具 。 所述捕获环的膨胀释放所述落球落入捕获器,其具有铣削到其内周中的保持槽,所述落球由此挤压到其中,由此防止其由于背压而被排出。