偏心環(huán)空流動的數值模擬研究
[Abstract]:Eccentric annular flow exists in drilling and oil recovery projects in petroleum industry. For drilling engineering, the velocity distribution and pressure drop distribution of eccentric annulus flow will be directly related to drilling speed, borehole quality and drilling cost, which is an important goal of drilling technology research. In this paper, the physical and numerical models of eccentric annular flow are established, using the standard k-? The turbulent model and the wall function method are used to numerically calculate the annular flow with different grid densities. The correlation between the grid density and the parameter distribution is analyzed and the grid density is selected. The numerical simulation results are in good agreement with the previous PIV flow experimental data, which verifies the numerical simulation method in this paper. On this basis, the variation of flow field velocity and pressure drop with time are analyzed by transient flow simulation, and the distribution of eccentricity, initial velocity and flow velocity of rheological parameters are obtained through steady flow research. The distribution law of velocity and pressure drop of sudden expansion flow field and the influence of different factors on swirl intensity of sudden expansion flow field are analyzed through the simulation of sudden expansion eccentric annulus flow. By means of two-factor comparative analysis, the law of interaction between rotation speed and eccentricity, initial velocity and rheological parameters, flow field deviation angle, maximum velocity and flow field unevenness is obtained. The influence of rotational speed on the pressure drop of helical flow field in eccentric annulus is analyzed under different rheological parameters. The influence of flow index, dynamic shear force, consistency coefficient and initial velocity on critical speed is obtained. The fitting formula of pressure drop gradient is obtained by multivariate nonlinear regression. The software for simulation calculation and analysis of annular flow is compiled and the corresponding registration certificate of computer software is obtained. The software has friendly interface, comprehensive function and good agreement with previous experimental data, which can meet the needs of practical engineering.
【學位授予單位】:中國石油大學(華東)
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TE24
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