МОДЕЛЮВАННЯ ВПЛИВУ ВЕРХНЬОЇ ГРАНИЧНОЇ УМОВИ НА КОЛИВАЛЬНІ ПРОЦЕСИ В КОЛОНІ ТРУБ ПРИ РОБОТІ БУРОВОГО ЯСА

Abstract

The main results of mathematical simulation models with three different upper boundary conditions, namely he hard pinching the upper section of the column, with the top section, which is kept at a constant spring stiffness and a top section that is held by a spring that works mainly in tension. The basic research results showed that calculations for selection of effective working conditions of the drilling jar are relative and retain high-quality picture for the mathematical model. The mathematical model of the upper boundary condition, which takes into account nonrigid connections in the hand drilling rig system accurately reflects the attenuation of oscillatory processes in an elastic wave reflection from the upper section of the column pipe, and, thus, it is possible to recommend this model for studies of the oscillatory processes’ effect during drilling jar works at shallow depths.