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Optimal Design of Internal Jet Orifice Reverse Circulation Bit and CFD Simulation Analysis
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College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University

Clc Number:

P634.4 1

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    Abstract:

    With hollow-through DTH hammer reverse circulation continuous coring (sample) technology, slagging or halfway slagging while drilling in the “hard, brittle, broken” complex formations are often encountered; to solve these problems, a new type of internal jet orifice reverse circulation bit was optimally designed on the basis of the existing hollow-through DTH hammer RC bit, which can form the powerful multilevel injection-suction fluid field. The article also imitates and analyzes the influence of 2 structural parameters of internal jet orifice level angle and the offset distance between internal jet orifice axis & the bit midpoint to the suction capacity of new RC bit structure. The simulation analysis has verified that the structure of such a RC bit is simpler with good reverse circulation effect.

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History
  • Received:November 02,2012
  • Revised:November 02,2012
  • Adopted:November 19,2012
  • Online: January 28,2013
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