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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 C. 기술과 교육 Vol.1 No.1
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.
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고-액 혼합유체의 Slim Hole 환형관내 유동특성에 관한 연구
우남섭,김영주,황영규,윤치호,한상목,이동길,박종명,박용찬 한국지구시스템공학회 2008 한국자원공학회지 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.
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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).
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ROV 진수 및 회수시스템(LARS)의 구조 안정성 평가
우남섭(Namsub Woo),김영주(Youngju Kim),한상목(Sangmok Han),김현지(Hyunji Kim),허선철(Sunchul Huh) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
According to the recent trend for developing natural resources, the high-technology equipment on the exploration ships is getting more technologically advanced. One of the high-technology equipment is the ROV launch and recovery system (LARS). ROV LARS is essential equipment of drilling system package for offshore plant. In this study, the telescopic boom crane is divided into two parts, umbilical winch and telescopic boom crane, and it is respectively designed three dimensional models using CATIA. And, dynamic simulation and structural analysis are performed using ANSYS. In the results, the strain is identified and some stress is concentrated, but the strain is very small and the maximum stress value is lower than the allowable stress. Thus, the structure does not have any impact on the strain and stress, and it is determined that the structure is safely designed. These results will be used for future ROV LARS new design technology development.
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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.
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