angle of bite การใช้

Along with the progress of drilling technology , many new types of bha such as steering motor assembly , dropping assembly with eccentric bend sub , dropping assembly with flexible connection are developed based on common building , dropping and holding assemblies . for using these bha , a new mathematical model is put forward for 3d static analysis of these types of bha under small deflection . and its weighted residual solution is given . the mathematical model includes ( 1 ) differential equations ; ( 2 ) boundary conditions at drill bit , stabilizer , bend angle , diameter change , tangential point and borehole wall ; ( 3 ) lateral forces and deflection angles of bit . the software based upon this method runs well