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Optimization of the JointThread of Diamond WireLine Coring Drill Pipe

SU Ji-jun1, YIN Kun1, GUO Tong-tong2   

  1. 1.College of Construction Engineering, Jilin University, Changchun 130026,China; 2.University of Technology of Compiegne,Compiegne 60200,France
  • Received:2005-02-28 Revised:1900-01-01 Online:2005-09-26 Published:2005-09-26
  • Contact: SU Ji-jun

Abstract: Diamond wireline coring drill is a kind of widely used drilling technology with the advantages of high quality, efficiency and economic. But the thread of wireline coring drill pipe made in our country is low strength and short service life.Drill pipe break trouble occurs constantly and it can’t fulfill the requirements of deep hole. Based on the nonlinear finite element theory, the effect of thread span and jointthread length of drill pipe on the strength of thread are studied by the application of largescale finite element analysis software. At the same time, optimization of thread span and thread length has been completed. The research results show that the stress distribution in the inner part of jointthread can be improved and the jointthread strength of drill pipe can be increased by 15.4% through enlarging the thread span and jointthread length of drill pipe.

Key words: drill pipe, thread, finite element method

CLC Number: 

  • P634.5
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