Numerical models are established based on the coupled SPH-FEM algorithm to explore the
damage mechanism of rock containing cracks by impacts of steel-particle water jet. The …

Rotary-percussion drilling with mud as the energy carrier is a competitive method for the
production of drill-holes. Fluidic hammer is a type of rotary-percussion drilling tool actuated …

Abstract Supercritical CO 2 (SC-CO 2) jet is now widely considered to have great potential
for application in oil-gas exploration and development. In order to further improve the …

In this study, a robust and pragmatic technique has been developed to experimentally and
theoretically evaluate the performance of high-pressure water jet (HPWJ) dynamics in tight …

Existing models can hardly provide a reliable guidance in designing intensifier utilizing axial
vibration energy of drill strings. The formation process of jet and the pulsation characteristics …

Using a no-moving-component output-fed bistable fluidic oscillator to control fluid flows into
a parallel path has been recognized for a considerable time, but as yet it is not so widely …

Focusing on various designs of fluidic oscillators for fluidic down-the-hole (DTH) hammers,
we systematically analysed the critical Reynolds number, operating range, and impacting …

Utilization of the rotary–percussive drilling tools can help to reduce friction along the drill
string and improve drilling performance in hard rock formations. However, intrinsic vibration …

Rate of penetration (ROP) is affected by many factors (ie rock properties, drilling
parameters), and the increase of ROP is required to meet the needs of modern drilling …

Conclusions Two innovative downhole intensifiers which can generate UHP jet are
introduced, with which diamond drill bit can be connected to shorten jet impacting distance …