Due to the world increasing energy demands, optimizing drilling system parameters such as weight on bit (WOB), and structure of drill string bit, also vibrations dynamic behavior strings are significant interest researchers industries. Specially, overcome limitations operations in oil gas industry, composite high-tech devices under development. In this research, fully coupled non-linear axial d...

We present a data exploration system equipped with smart drill-down, a novel operator for interactively exploring a relational table to discover and summarize "interesting" groups of tuples. Each such group of tuples is represented by a rule. For instance, the rule (a, b, ★, 1000) tells us that there are a thousand tuples with value a in the first column and b in the second column (and any valu...

Severe environment in deep ocean affects operating reliability and security of coring drill. Adopting heave motion signal measured by accelerometer to confirm heave compensation of coring drill, the compensation control method is proposed using disturbance observer to restrain the disturbance. Then, the disturbance observer is designed. The heave motion simulation for coring drill is done with ...

Due to the lower tool as the research object to analyze the vibration of the drill string, causes the loss of the low order natural frequency of the drill string and the inherent vibration mode, give rise to the distortion and error of the result from the transient analysis of the drill string. For this purpose, the whole drill string of the deep wells is studied in the article, build the mecha...

We document the tectonic and metamorphic evolution of thrust nappes eastern island Elba. The area exposes a natural cross section Northern Apennines hinterland, from basement units to overlying continent- ocean-derived nappes. integrated mapping, analysis structures microstructures, interpretation drill core logs with lithostratigraphic, metamorphic, geochronological constraints, producing nove...

Abstract The detailed analytical and experimental investigation of the fracture behaviour quasi-brittle materials is an endeavour which has been ongoing worldwide for many years. Such are usually characterized in terms their mechanical parameters, determined based on evaluation quasi-static experiments. One most commonly used building with a response concrete, often cement matrix. It sometimes ...

In this manuscript, an attempt has been made to predict and improve the overall equipment effectiveness of core drill rigs. A combined Box–Jenkins artificial neural network model was used develop a three parameter (drill pushing pressure, penetration rate & average pillar pit cycle time) for predicting effectiveness. efficiency The values mean percentage error, root square normalized men bi...