Numerical Simulation Of Flow Field Analysis Of Hole Cleaning Tool Based On TFM

Some theories and applications of liquid-solid two-phase flow are involved in many engineering fields.For example,hydraulic sand removal,deep-sea uplift,flow of fluid and cuttings in the annulus of petroleum industry,migration of hydraulic fracturing proppant in reservoir,etc.In the drilling process of horizontal well and extended reach well,the insufficient movement of cuttings in the annulus will lead to the accumulation of cuttings,which will lead to high friction and high torque of drilling tools,and safety accidents such as sticking and choking.In recent years,the design and research of helical blade have emerged gradually at domestic and foreign.Some scholars have put forward a vane type helical blade,which is used to process several shapes of blades on the drill pipe body,usually the blade diameter is close to the drill pipe joint and is used to connect with the drill pipe.The spiral flow in the annulus is induced by the rotation of the drill pipe to destroy and remove the cuttings bed.However,the operation of helical blade is affected by many factors,and the interaction between different factors is complex.Therefore,it is of great practical significance to study the liquid-solid two-phase flow in the spiral flow field induced by helical blade.Based on the Euler-Euler two-fluid model with the kinetic theory of granular flow,the liquid-solid two-phase flow problem is studied in this paper.The Huilin-Gidaspow model is used to calculate the interphase forces and the sliding grid method is used to realize the rotation of the blade domain.Finally,three-dimensional numerical simulation of the flow field of helical blade in annulus is realized.For different structure parameters and hydraulic parameters,different rotating speed,different blade height,different blade spiral angle,different rotation direction,The attenuation law of blade induced helical flow and the characteristics of liquid-solid two-phase flow under the condition of single-phase drilling fluid are studied numerically.The results show that the swirl intensity of the helical flow induced by the blade behind the blade decreases exponentially under the condition of single-phase flow of the drilling fluid,and the initial swirl intensity increases significantly with the increase of the rotating speed and blade height,and when the blade rotates counterclockwise,The initial swirl intensity decreases gradually with the increase of spiral angle,but the opposite law occurs when rotating clockwise.Under different conditions,the rock carrying capacity of blade induced helical flow decreases with the increase of axial displacement.The increaseof rotating speed and blade height can significantly enhance the suspension ability of cuttings behind the blade,and when rotating counterclockwise,With the increase of spiral angle,the rock carrying capacity of blade induced helical flow decreases gradually,and the law of clockwise rotation is opposite.The results can provide some references for designing more suitable and efficient cuttings cleaning tools in the future.