This paper develops a new solution approach to solve nonlinear forced vibrations of
functionally graded (FG) piezoelectric shells in multi-physics fields. The FG piezoelectric …

As the main cutting unit of Polycrystalline diamond compact (PDC) bit, PDC cutter directly
determines the drilling performance and service life of PDC bit. According to failure analysis …

This paper aims to study the fracture characteristics of blunt indenter impacting formation
under static and harmonic dynamic loads by carrying out a series of FE numerical …

To provide a more accurate evaluation of the scale of deep underground resources, a new
pressure coring system was carefully developed and its strength and safety of the …

In view of the vibration failure of drilling string system in ultra-high temperature and high
pressure (ultra-HPHT) curved wells, an axial-lateral-torsion coupling (ALTC) nonlinear …

In this paper, various aspects of polycrystalline diamond compact (PDC) preparation are
examined in depth for the purpose of assessing its wear resistance, evaluation method, and …

Microwave-assisted hard rock breakage is a potential solution for exploitation of deeper
resources. A series of ultrasonic non-destructive tests and NMR tests were conducted to …

In the drilling process of ultra-HPHT oil & gas wells, the drill string is more susceptive to
tends to stick slip, whirl, jump and other harmful movements, which will lead to a decrease in …

In this paper, we present a comprehensive friction reduction model to investigate the
combined effects of pipe rocking and drilling agitator tools (DAT) on friction reduction during …

Under dynamic loading, the geomechanical properties of porous clastic rocks differ from
those in quasistatic loading. A small experimental rig was built to directly assess the …