发明名称 Oil well service tool
摘要 Apparatus for reducing landing shock for instruments run into earth boreholes through drill string bores and to maintain azimuthal orientation being protected with enclosing structure. An instrument package has a depending spear point for engaging a baffle in the drill string. The spear point encloses a spring and fluid damped shock absorber. The instrument package further includes a second internal fluid damped shock absorber and a spring type rotary shock absorber for the measuring instrument.
申请公布号 US4413516(A) 申请公布日期 1983.11.08
申请号 US19820360108 申请日期 1982.03.19
申请人 OIL-WELL DRILLING CONTROL, INC. 发明人 CROOM, JR., ROBERT E.;JETER, JOHN D.
分类号 E21B47/01;E21B47/022;G01D11/12;(IPC1-7):G01D11/24 主分类号 E21B47/01
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