DEVELOPMENT OF A MODEL FOR THE STUDY OF HYDRODYNAMIC PARAMETERS OF A DRILL BIT

Abstract

The article considers the importance of the correct selection of the number of hydromonitor nozzles of the drill bit and their geometric parameters for effective removal of cuttings during the construction of wells. It is emphasized that optimal design solutions should be based on the analysis of the distribution of the velocity of the flushing fluid in the bottomhole zone and the annular channel, and not only on engineering assumptions. For this purpose, it is advisable to use modern numerical modeling (CFD) methods that allow studying hydrodynamic processes under different regimes taking into account various parameters, such as the bit rotation frequency, the roughness of its surfaces and the surfaces of the wellbore, etc. The paper notes that although there are many studies devoted to modeling drilling hydraulics, the influence of the number, location of jets and the degree of fluid turbulization on the quality of bottomhole cleaning has still not been studied sufficiently. The use of software complexes that use the finite element method allows obtaining detailed simulation modeling results, namely, distributions of pressure, velocity, vorticity , temperature, etc. This allows you to optimize the parameters of the flushing units without the need for expensive experiments, which significantly speeds up the process of improving the design of the drill bit and introducing new models to the market. A computational model has been developed and applied to simulate the leakage of flushing fluid from the hydromonitor nozzles of the cone drill bit. The established boundary conditions for modeling take into account the parameters of the drilling fluid, pressure, bit rotation frequency and surface roughness. The model allows you to quantitatively assess the influence of various parameters, such as fluid density, volumetric flow rate and nozzle geometry on the efficiency of well flushing. The results obtained include the distributions of velocity, pressure and turbulence of the flow in the bottomhole zone , which contributes to further improvement of the design of cone drill bit flushing systems.