Design of double-shoulder threaded joints of drilling string elements

Purpose. Development of a method for simulating the screwing torque/moment and researching design double-shoulder threaded joints while preserving their geometric parameters. Determination optimal length additional shoulder pin part developed drill collar (DC) NC50, NC55 type various standard sizes. Establishing dependence between other parameters joint DC further use when developing sizes similar threads. Methodology. The development torque was carried out using finite element parametric modeling. Finding. A proposed developed, which made it possible to improve model automated design. lengths threads types were determined. For planning with above-mentioned threads, dimensionless coefficient derived its value calculated. nomogram built determine due this coefficient. Originality. string parts has been improved. This preserves enables modeling wide range joints. Practical value. structures elements by