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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.
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.
해양 시추장비 제어시스템 및 HILS 기반 검증 기술 개발
우남섭(Nam Sub Woo),김영주(Young Ju Kim),한상목(Sang Mok Han),김태우(Tae Woo Kim),이왕도(Wang Do Lee),김종민(Jong Min Kim),임범현(Bum Hyun Im) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Hardware in the loop (HIL) simulation has become increasingly popular in recent years, because of its ability to shorten product development time for complex dynamic systems through quick and cost efficient testing over a wide range of conditions. HILS is a technique where machine control software runs virtual machines, which are mathematical models emulating the physical machines. This paper introduces the research on development of control system for offshore drilling equipment and HIL as a methodology for drilling control system software testing.
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.
지열-태양열 복합이용시스템의 냉ㆍ난방 운전 성능에 관한 연구
우남섭(Woo Nam-Sub),황인주(Hwang In-Ju),이홍철(Lee Hong-Chul) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
An experimental solar assisted ground-source heat pump system is designed and constructed, and its thermal performance is investigated. The system basically consists of flat plate solar collectors, a heat pump, a cylindrical hot water storage tank, a ground heat exchanger, and measuring units. All measurements are automatically collected as a function of time by means of a measurement chain feeding to a data logger in combination with a PC. Hourly and daily variations of solar radiation, coefficient of performance of the heat pump (COP<SUB>HP</SUB>) and that of the overall system (COPS) are calculated to evaluate the system performance. The experimental results were obtained from August 2004 to March 2005.