Highly efficient hydromonitor nozzles for a drill bit reinforced with PDC cutters

Relevance. The article gives a review of existing patented hydro-monitor nozzles, which are widely used in the design of rock-destroying tools. Nowadays, it is important to use highly efficient hydro-monitor nozzles, which would achieve the highest flow rate of flushing fluid. This will optimize drilling by destroying the rock at the bottom of the well due to the emergence of the hydro-monitor effect, which will consequently improve well cleaning and reduce the wear of the rock-destroying tool. This is achieved due to the fact that the jet of washing fluid will have a large kinetic energy at the exit of the nozzle. This leads to a change in pressure in the rock pores, as a result of which the drilling fluid enclosed in them is compressed-tensioned, a hydraulic shock occurs, resulting in the pore walls, expanding, brittle destruction at the bottomhole. Application of these nozzles will reduce costs and increase profitability of construction of wells for various purposes. Aim. Development of a design of a jet nozzle for a drill bit, when used, the highest flow rate of the drilling fluid stream would be achieved, compared to existing analogues. Methods. To determine the efficiency of existing nozzles, a hydrodynamic CFD model of drilling fluid flow in the nozzle was developed using the SolidWorks Flow Simulation program. The Herschel–Bulkley rheological model was selected for modeling the drilling fluid flow. Such parameters as turbulence intensity and scale were set to describe turbulence. Results and conclusions. Modeling and comparison of existing patented jet nozzles with the proposed one was performed. A new geometric shape of the jet nozzle was developed, showing better performance compared to existing analogues.