FPSO: Tanks Optimization Design Approach

2005 ◽  
Author(s):  
Jose M. Vasconcellos ◽  
Antonio C. Fernandes ◽  
Alberto Santos ◽  
Marcos D. A. S. Ferreira
Keyword(s):  
Optimization Design ◽  
Load Condition ◽  
Optimization Procedure ◽  
Oil Fields ◽  
Design Approach ◽  
Campos Basin ◽  
Offshore Oil Production ◽  
New Ideas ◽  
Offshore Oil ◽  
Stress Minimization

Brazil Campos Basin is under large offshore oil production activity. Many new giant oil fields are under development. Brazil has been using tankers ship converted as FPSO platform vessel. At this moment three FPSO are in final construction phase to be installed in Campos Basin. Many oil cargo tankers are transformed to work as FPSO. Although they are showing good characteristics, some problems are having been emerging. The turret design approach was used in the primary FPSO’s but recently the spread mooring system with rigid risers is also under installation in Campos Basin. New ideas about Floating Production Storage and Offloading (FPSO) system have been in focus since some projects started working in an appropriately FPSO design direction. This paper spotlights one of these ideas: the FPSO tankers arrangement as a possible optimization procedure. MARPOL rule is followed but an alternative procedure is suggested to consider vessel control under wave’s action and at the same time looking for stress minimization. The aim in this procedure is increase the operator capability. The idea is allow the FPSO operator change the load condition using ballast in segregated tanks assuring a more suitable vessel condition in waves. Stability, wave response, stresses and operation ability should be also merit functions in any optimization process. A box shape FPSO-BR is used to highlight the procedure application. Results are presented and conclusion pointed out.

Removal of Wax Deposits in Flexible Pipelines by Electrical Heating

2000 ◽  
Author(s):  
Marcelo de Albuquerque Lima Gonçalves ◽  
Carlos Henrique da Silva Dittz
Keyword(s):  
Electrical Current ◽  
Electrical Heating ◽  
Heating Process ◽  
Southern Brazil ◽  
Oil Pipeline ◽  
Flexible Pipes ◽  
Campos Basin ◽  
Offshore Oil Production ◽  
Wax Deposits ◽  
Offshore Oil

In offshore oil production, sometimes unexpected situations may occur, resulting in full blockage of a subsea oil pipeline. The blockage is often due to wax freezing in cold sea. In such cases the solution is to remove the blocked oil pipeline from the subsea. In Campos Basin, Brazil, the launcher ship brings the pipelines to the Vitória Harbor, E.S (southern Brazil). The solution adopted there for blockage removal is the application of differential pressure to promote block displacement. The maximum allowed pressure is equal to the rating pressure for the pipeline, but sometimes it is not enough to move the wax core. A new solution has been developed to allow the recovery of those flexible pipes. It consists of an electrical heating process to melt the wax residues. The electrical current circulates through a metallic layer of the flexible pipeline. This solution was accomplished with success and more than 20 km of pipelines have already been recovered. This paper presents the numerical simulation and the experimental results of a flexible pipeline reel electrical heating operation and the method to control it.

scholarly journals Brazilian offshore oil exploration areas: an overview of hydrocarbon pollution

2020 ◽  
Vol 15 (5) ◽  
pp. 1
Author(s):  
Daniel Constantino Zacharias ◽  
Adalgiza Fornaro
Keyword(s):  
Operating Conditions ◽  
Oil Fields ◽  
Brazilian Coast ◽  
Oil Exploration ◽  
Systematic Review Methodology ◽  
Oil Reserves ◽  
Campos Basin ◽  
The Subject ◽  
Seawater Contamination ◽  
Offshore Oil

The basins of Campos and Santos, the most important offshore oil reserves in Brazil, hold potential for being the largest offshore oil exploration fields in the next decades, mainly due to the oil located in the pre-salt layer. This region presents real conditions for the occurrence of intense atmospheric events added to the high velocity of the meanders of the Brazilian current. However, the increasing risk of accidents and damage in the region has been the subject of concern and discussion. The risks in the basins of Campos (2011) and Santos (2012) may not exhibit the the same potential for disastrous events as do those in the oil fields of Alaska and of the Gulf of Mexico, but accidents in these areas are not unlikely, as already evidenced by previous accidents under similar operating conditions (e.g. Chevron Platform accident in Campos Basin, RJ, Brazil, 2011). This paper highlights discussion of the multidisciplinary and substantial environmental features in oil exploration fields along the Brazilian coast based on Semi-Systematic Review methodology. The aspects evaluated cover not only geological traits, oceanic and meteorological circulation, but also current oil production, the most significant oil spill accidents recorded up to 2019 and the discussion about some current levels of seawater contamination.

FPSO-H Preliminary Design Approach

2008 ◽  
Author(s):  
C. Ferraz ◽  
N. G. Oliveira ◽  
J. M. Vasconcellos
Keyword(s):  
Oil Fields ◽  
Design Approach ◽  
Production Plant ◽  
Mooring System ◽  
Preliminary Design ◽  
Floating Platform ◽  
Ballast Tank ◽  
Campos Basin ◽  
Marine Engineering ◽  
Vessel Motion

Brazil Campos Basin is under large offshore oil production activity. Many new giant oil fields are under development. In many oil fields Brazil has been using ship tankers converted as FPSO platform vessel. At this moment four FPSO are in final construction phase to be installed in Campos Basin (P-43, P-48, P-50 and P-54). Many oil cargo tankers are transformed to work as FPSO. Although they are showing good characteristics, some problems are rising. The turret design approach was used in the primary FPSO’s design phase but recently the spread mooring system is also under installation in Campos Basin. Two converted FPSO’s (P-43 and P-48) were installed recently using spreading mooring system. The P-43 was installed at 800 m of water depth in Barracuda field at Campos basin. It is brother P-48 is installed at Caratinga field. Both platforms are designed to produce 300.000 barril/day. New ideas about Floating Production Storage and Offloading (FPSO) system have been in focus since some projects started working in an appropriately FPSO design direction. The Naval Architecture and Marine Engineering Department at COPPE/UFRJ has been investigating a new FPSO design and many ideas are under evaluation. One of these ideas is implement a ballast tank system to improve the floating platform behavior in waves with less structure stress. This paper presents the FPSO-H preliminary design. The aim of this project is investigate a new conception where deck are is used to separate accommodation and production plant. Also, the design applied the idea that the number of tanks should be increased to allow better weight distribution and improve the tanks inspection plain. In addition the design includes ballast tanks to increase the operator ability to control stability and vessel motion. The paper presents a case study of FPSO-H design for a Campos basin field. Graphics and tables shown the main results and recommendations are highlights for future work.

Optimization of well product pumpless transportation under offshore oil production conditions

2017 ◽  
pp. 140-142
Author(s):  
A.G. Akhmadeev ◽  
◽  
Pham Thanh Vinh ◽  
Bui Trong Han ◽  
Le Huu Toan ◽  
...  
Keyword(s):  
Oil Production ◽  
Offshore Oil Production ◽  
Offshore Oil ◽  
Production Conditions

scholarly journals A Lagrange Relaxation Based Decomposition Algorithm for Large-Scale Offshore Oil Production Planning Optimization

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1257
Author(s):  
Xiaoyong Gao ◽  
Yue Zhao ◽  
Yuhong Wang ◽  
Xin Zuo ◽  
Tao Chen
Keyword(s):  
Production Planning ◽  
Large Scale ◽  
Oil Production ◽  
Original Model ◽  
Decomposition Algorithm ◽  
Scale Model ◽  
Lagrange Relaxation ◽  
Planning Optimization ◽  
Offshore Oil Production ◽  
Offshore Oil

In this paper, a new Lagrange relaxation based decomposition algorithm for the integrated offshore oil production planning optimization is presented. In our previous study (Gao et al. Computers and Chemical Engineering, 2020, 133, 106674), a multiperiod mixed-integer nonlinear programming (MINLP) model considering both well operation and flow assurance simultaneously had been proposed. However, due to the large-scale nature of the problem, i.e., too many oil wells and long planning time cycle, the optimization problem makes it difficult to get a satisfactory solution in a reasonable time. As an effective method, Lagrange relaxation based decomposition algorithms can provide more compact bounds and thus result in a smaller duality gap. Specifically, Lagrange multiplier is introduced to relax coupling constraints of multi-batch units and thus some moderate scale sub-problems result. Moreover, dual problem is constructed for iteration. As a result, the original integrated large-scale model is decomposed into several single-batch subproblems and solved simultaneously by commercial solvers. Computational results show that the proposed method can reduce the solving time up to 43% or even more. Meanwhile, the planning results are close to those obtained by the original model. Moreover, the larger the problem size, the better the proposed LR algorithm is than the original model.

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