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고-액 혼합유체의 Slim Hole 환형관내 유동특성에 관한 연구
우남섭,김영주,황영규,윤치호,한상목,이동길,박종명,박용찬 한국지구시스템공학회 2008 한국지구시스템 공학회지 Vol.45 No.1
안쪽축이 회전하는 수직과 경사진 환형관 내에서 고-액 혼합 유동의 수력학적 이송 특성을 실험과 수치해석을 이용하여 고찰하였다. 액체에 섞인 입자에 작용하는 양력은 경사 굴착에서 암편의 제거, 골재 채취장에서의 골채 이송 및 침전물 이송 등과 같은 분야에서 중요한 역할을 수행한다. 본 연구에서는 환형관 바깥 실린더를 투명한 아크릴로 제작하여 고체 입자의 거동 특성을 관찰할 수 있도록 하였다. 입자 이송 유체로 물과 CMC 수용액(aqueous solutions of sodium carboxymethyl cellulose)을 이용하여 완전 발달된 유동장에 대해서 시추액의 입자 이송능력, 입자 이송속도 및 환형관내 축방향 압력손실에 대한 환형관 경사각과 안쪽축 회전의 영향을 고찰하였다.
우남섭,권재기,박종명,김상식,김영주,Woo, Nam-Sub,Kwon, Jae-Ki,Park, Jong-Myung,Kim, Sang-Shik,Kim, Young-Ju 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
해상에서의 시추작업은 해저면을 통해서 시추되는 유정에서 이루어지는 일련의 기계적 프로세스라 할 수 있다. 해양 시추설비는 해저에 매장된 석유나 가스의 매장량 확인을 위한 테스트 유정(well)과 이를 경제성 있는 생산용 유정으로 만들기 위해 사용되는 시설로 해양에서의 시추작업은 대부분 타 지역으로의 이동을 위해 이동식으로 제작되며, 작업 해역의 수심에 따라 크게 리그(jack-up, semi-submersible)와 드릴십(drillship)으로 구분할 수 있다. 최근에는 석유와 가스의 개발을 위한 시추작업이 급진적으로 심해로 옮겨가고 있으며 작업 가능 수심이 3,000 m에 이르고 있다. 본 논문에서는 이러한 해상 시추설비에 탑재되는 대표적 해양플랜트 기자재인 시추시스템을 소개하고 최근의 기술개발 동향을 알아보고자 한다. Offshore drilling refers to a mechanical process where a wellbore is drilled through a seabed. It is typically carried out in order to explore for and subsequently extract petroleum which lies in rock formations beneath the seabed. There are many different type of facilities from which offshore drilling operations take place. These include bottom founded drilling rigs, combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units including semi-submersibles and drillships. These are capable of operating in water depths up to 3,000 m. In this paper, we introduce the drilling system, which is mounted on the offshore drilling facilities.
고-액 혼합유체의 Slim Hole 환형관내 유동특성에 관한 연구
우남섭,김영주,황영규,윤치호,한상목,이동길,박종명,박용찬 한국자원공학회 2008 한국자원공학회지 Vol.45 No.1
Experimental and numerical studies were carried out to investigate solid-liquid mixture upward hydraulic transport of solid particles in vertical and inclined annuli with a rotating inner cylinder. Lift force acting on a fluidized particle plays a central role in many importance applications, such as the removal of drill cuttings in horizontal drill holes, sand transport in fractured reservoirs, sediment transport, and cleaning of particles from surfaces, etc. In this study, a clear acrylic pipe was used in order to observe the movement of solid particles. Effect of annulus inclination and drill pipe rotation on the carrying capacity of drilling fluid, particle rising velocity, and pressure drop in the slim hole annulus have been measured for fully developed flows of water and of aqueous solutions of sodium carboxymethyl cellulose (CMC).
뉴튼 및 비뉴튼 유체의 slim-hole 환형관내 유동에 관한 연구
우남섭(Nam-Sub Woo),배경수(Kyung-Su Bae),서병택(Byung-Taek Seo),황영규(Young-Kyu Hwang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The present study concerns an experimental study of fully developed laminar flows of Newtonian and non-Newtonian fluids through a slim hole annulus, in combination with an axial flow and inner cylinder rotation. The study is motivated by a need to understand the flow of drilling fluids in oil wells. Pressure losses and skin friction coefficients have been measured for the flows of water and power-law fluids (CMC and bentonite solutions) at the rotational speed of inner cylinder in 0~500 rpm. Main calculation parameters are rheological property of working fluid, flow rate, and radius ratio of the inner and outer cylinders. This study shows the fundamental difference of flow pattern between Newtonian and non-Newtonian fluid in slim hole annuli.
Slim hole 환형관내 고-액 2상 유동에 관한 연구
우남섭(Nam-Sub Woo),서병택(Byung-Taek Seo),황영규(Young-Kyu Hwang),김영주(Young-Ju Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An experimental investigation is conducted to study a 2-phase vertically upward hydraulic transport of solid particles by water and non-Newtonian fluids in a slim hole concentric annuli with rotation of the inner cylinder. 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 0.3 m/s to 2.0 m/s. The mud systems which were utilized included fresh water and CMC solutions. Main parameters considered in the study were inner-pipe rotary speed, fluid flow regime and particle injection rate. Pressure drops and average flow rates were measured in the Reynolds number range of 10²<Re<10⁴. For both water and 0.2% CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.
환형관내 고 액- 2상 유동의 압력손실 변화특성에 대한 연구
우남섭(Nam-Sub Woo),한상목(Sang-Mok Han),황영규(Young-Kyu Hwang),윤치호(Chi-Ho Yoon),김영주(Young-Ju Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Field measurements have revealed that the pressure drop over a borehole during drilling of a slim oil well or a well with a long reach can depend significantly on the rotation speed of the drill pipe. An accurate prediction of the annular frictional pressure drop is therefore important for conditions where the annular clearance is small. An experimental study was carried out to study solid-liquid two phase flow in a slim hole annulus. Annular velocities of carrier fluids varied from 0.2 ㎧ to 1.5 ㎧. The carrier fluids which were utilized included tap water and CMC water solutions. Pressure drops and average flow rates were measured for the parameters such as inner-pipe rotary speed, carrier fluid velocity, hole inclination and particle injection rate. For both water and CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.