Invention Grant
US07918290B2 Systems and methods for protecting drill blades in high speed turbine drills 有权
用于在高速涡轮钻机中保护钻头的系统和方法

  • Patent Title: Systems and methods for protecting drill blades in high speed turbine drills
  • Patent Title (中): 用于在高速涡轮钻机中保护钻头的系统和方法
  • Application No.: US12313463
    Application Date: 2008-11-20
  • Publication No.: US07918290B2
    Publication Date: 2011-04-05
  • Inventor: Guy J. Rushton
  • Applicant: Guy J. Rushton
  • Applicant Address: US TX Sugar Land
  • Assignee: Schlumberger Technology Corporation
  • Current Assignee: Schlumberger Technology Corporation
  • Current Assignee Address: US TX Sugar Land
  • Agent Jeremy P. Welch; Brigitte L. Echols; Charlotte Rutherford
  • Main IPC: E21B4/02
  • IPC: E21B4/02
Systems and methods for protecting drill blades in high speed turbine drills
Abstract:
A drilling assembly in an elongated hole including a housing defining an interior with a plurality of motor stages in the interior. Each motor stage has at least one blade with supporting platform surfaces. A casing within the interior surrounds the plurality of motor stages and defines an annular flowpath with the housing. The casing also defines at least one offtake passage adjacent each motor stage. A shielding fluid passes through the annular flowpath and, in turn, the at least one offtake of each motor stage to coat and protect the at least one blade and supporting platform surfaces. A driving fluid passes through the casing for propelling the at least one blade of each motor stage. Preferably, the shielding fluid is at a relatively higher pressure than the driving fluid with a substantially constant ratio maintained between the between the shielding fluid and the driving fluid.
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