Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section oil gas wells, they not been successfully used directional drilling due to drill tool wear wellbore disturbance. Herein, we developed a novel type DTH hammer with self-propelled round bit overcome technical difficulties drilling. Nonlinear dynamic ...

Abstract Bolt support is the main way of underground roadway in coal mines China. At present, there are some problems domestic mines, such as low efficiency and poor safety. In view above problems, a structural scheme omni-directional multi angle automatic roof bolter designed. Firstly, based on D-H method, kinematics model drill arm structure anchor drilling robot to side working environment e...

Nowadays we can observe a growing demand for installations of new gas pipelines in Europe. A large number them are installed using trenchless Horizontal Directional Drilling (HDD) technology. The aim this work was to develop and compare machine learning models dedicated risk assessment HDD projects. data from 133 projects eight countries the world were gathered, profiled, preprocessed. Three mo...

In the process of research, there was investigated question influence rotary movement washing fluid on hydrodynamic processes with purpose enhancement its transportation properties, especially in drilling horizontal wells. At present stage science and technology development, improvement effectiveness wells is done at expense circulation that prevent complications related to stability disturbanc...