According to the API standard [37], the calculation formula of drill pipe joint torque is:(8)T=SA12(P02π+Rtfcosθt+RSf)(9)Rt=C+[C−(LPC−0.625)×T0×112]4(10)RS=OD+Qc4where T is make-up torque, S is API recommended deduction level, f is the friction coefficient of effect...
Article Developing an Improved Parameter Estimation Method for the Segmented Taper Equation through Combination of Constrained Two-Dimensional Optimum Seeking and Least Square Regression Lifeng Pang 1, Yongpeng Ma 2, Ram P. Sharma 3, Shawn Rice 4, Xinyu Song 5 and Liyong Fu 1,6,* 1 Research ...