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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).
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.
지역냉방 도입을 위한 시스템 구성 및 최적화 방안 연구
우남섭(Nam-Sub Woo),이태원(Tae-Won Lee),김용기(Yong-Ki Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Demands for the high efficient and high performance energy supply system having been continuously increased according to the rise of quality of life and rapid increases of energy cost all over the world. District cooling system with combined heat and power plant offers massive and collective cooling energy production, which is higher in efficiency than conventional systems. But the district cooling system in Korea mainly consists of absorption type chiller, located in the demand sides and district hot water is supplied to the absorption type chiller. This study proposes new district cooling system configuration for district cooling with combined heat and power plant in order to maximize its benefits to a new urban development. The calculated results show that the new district cooling system is able to reduce operating costs and to get higher energy efficiency compared with conventional system.
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.
우남섭(NamSub Woo),박종명(JongMyoung Park),권재기(JaeKi Kwon),김영주(YoungJu Kim),김상식(SangShik Kim),정성윤(SungYoon Jung) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Subsea separation is an emerging technology that requires new and optimized solutions. Subsea separation system should be reliable to ensure successful operation in a wide range of 3-phase flow regimes, without need for maintenance. Separating gas, oil, water, and sand at the seabed has great economic potential for many subsea field developments. A subsea separator can avoid or simplify costly surface platforms or floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, subsea separation system and its foreign and domestic development status are introduced.
우남섭(Nam-Sub Woo),김용기(Yong-Ki Kim),이태원(Tae-Won Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The building HVAC systems have very different qualities of performance and durability with the superintendent's ability for management and maintenance. The poor management of these systems finally result in the increase of operating costs and energy consumptions due to low efficiency. This paper presents an overview of monitoring and analyzing in-situ performance of absorption type chiller which has a capacity of 250 RT. The operating data were used in the evaluation of system's performance and LCC based economic analysis for the decision of efficient management and maintenance plan. The results led to finding a possible energy saving method and efficient maintenance and management method of the building HVAC systems.