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이왕도 ( Wang-do Lee ),한상목 ( Sang-mok Han ),전중호 ( Joong-ho Chun ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.6
An investigation is conducted to study a solid-liquid mixture vertically upward hydraulic transport of solid particles by non-Newtonian fluids in the Mud system. Rheology of particulate suspensions in viscoelastic fluids is of importance in many applications such as particle removal from surfaces, transport of proppants in fractured reservoir and cleaning of drilling holes, etc. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.4 m/s to 1.2 m/s. The mud systems which were utilized included aqueous solution of sodium carboxymethyl cellulose (CMC) solutions. Main parameters considered in the study were inner-pipe rotary speed, fluid flow regime and particle injection rate. Solid volumetric concentration and pressure drops were measured for the various parameters such as inclination angle, flow rate, and rotational speed of inner cylinder.
다양한 각도의 환형관내 시추 유동에 대한 암편 이송 특성 연구
김명진(Young-Ju Kim),김경수(Kyung-Su Kim),이왕도(Wang-Do Lee),김태우(Tea-Woo Kim),한상목(Sang-Mok Han),우남섭(Nam-Sub Woo),김영주(Young-Ju Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Cuttings transport and hole cleaning is important for an effective well drilling operation. And in directional drilling, it is very important to understand the drilling multi-phase flow characteristics because it is difficult to control cuttings transport. Therefore, various researches have been steadily conducted for efficient drilling technology development and field application, and many papers on drilling flow have been published. API developed Carrying Capacity Index(CCI) for describe hole cleaning also recommend an analytical and numerical approach. In this study, two empirical equations of Larsen’s model and Rubiandini’s model for the cuttings piece transfer velocity were applied to the numerical analysis technique. Through the two models, the minimum fluid velocity at which the cuttings in the inclined annular are not stagnant and can be transported was calculated and compared with the numerical analysis results. This simulation was performed with the DDPM + DEM model, and it is expected that it can be used to establish a safer and more effective drilling plan in a new drilling environment in the future.