Three-Column TLP Concept for Marginal Field Development

2009 ◽  
Author(s):  
Neil Williams ◽  
Homayoun Heidari ◽  
Sean Large
Keyword(s):  
Equilateral Triangle ◽  
Cost Effective ◽  
Technical Development ◽  
Effective Solution ◽  
Field Development ◽  
Geometric Center ◽  
Marginal Field ◽  
Rectangular Columns

This paper discusses the development of a new self-stable TLP concept for marginal field applications. This concept — called ThreeStar™ — is based on three rectangular columns arranged at the vertices of an equilateral triangle and battered towards its geometric center. The columns are joined by conventional rectangular pontoons. The reduced number of tendons/piles relative to a conventional four column TLP makes the ThreeStar a cost-effective solution in applications where the production riser count is relatively low or the topsides payload is small. This paper presents a description of the technical development of the ThreeStar TLP and outlines the unique features of the concept. The relative merits of the ThreeStar over comparable four-column TLPs for different environments and payload ranges are discussed. Finally, ThreeStar systems are presented for two example deepwater applications.

Design of Steel Lazy Wave Riser for Disconnectable FPSO in the Gulf of Mexico

2013 ◽  
Author(s):  
Jingyun Cheng ◽  
Peimin Cao
Keyword(s):  
Gulf Of Mexico ◽  
Water Injection ◽  
Integrated Design ◽  
Cost Effective ◽  
Performance Criteria ◽  
Harsh Environment ◽  
Effective Solution ◽  
Field Development ◽  
Integrated Design Approach ◽  
Preferred Solutions

The disconnectable Floating Production Storage and Offloading system (FPSO) is one of the preferred solutions for the deepwater field in the harsh environment and far away from existing pipeline infrastructures. This paper presents a design of steel lazy wave riser (SLWR) system for an internal turret moored disconnectable FPSO in the Gulf of Mexico. The integrated systems of FPSO, disconnectable buoy, riser, and mooring are discussed while focusing on the design challenges of SLWR system. Due to the complexity of SLWR geometry, a systematic configuration approach is introduced based on buoy payload and riser performance criteria. The study includes the strength and fatigue analysis of production, gas export and water injection risers for the connected, disconnecting, and disconnected conditions. The sensitivity of buoy disconnecting due to vessel offset is also presented. It concludes that SLWR with disconnectable FPSO is a feasible and cost effective solution for deepwater field development in the Gulf of Mexico. The study demonstrates the importance of an integrated design approach, and provides guidance for configuring and design of future disconnectable systems with SLWRs.

Flowline Bundle Concept for JZ 9-3 Field Development

2014 ◽  
Author(s):  
Jing Cao ◽  
Yong Sha ◽  
Liwei Li
Keyword(s):  
Engineering Design ◽  
Corrosion Protection ◽  
Thermal Performance ◽  
Oil And Gas ◽  
Cost Effective ◽  
Development Project ◽  
Bohai Bay ◽  
Effective Solution ◽  
Field Development ◽  
Protection Potential

Flowline bundle system consisting of carrier pipe, sleeve pipe and internal flowlines offers smart solution for the infield transportation of oil and gas. Due to its features, flowline bundle offers a couple of advantages over conventional flowline in particular for cases where multi-flowlines and high thermal performance are of great interests. The main benefits and advantages of such system include excellent thermal performance to prevent wax formation and hydrates, multiple bundled flowlines, mechanical and corrosion protection, potential reuse, fabricated onshore, as well as towing installation without the requirement of professional pipelay vessel etc. Flowline bundle system can be a smart solution for certain applications, which can be safe and cost effective solution. The objective of this paper is to present the feasibility study of flowline bundle concept for the JZ 9-3 West Development project in Bohai Bay, Offshore China. This study covers engineering design, fabrication, and offshore towing installation. Design and installation results have been presented and the feasibility of flowline bundle concept has been fully demonstrated for the JZ 9-3 West field development.

THE COBIA 2 SUBSEA COMPLETION

1984 ◽  
Vol 24 (1) ◽  
pp. 153
Author(s):  
M. N. Shaw
Keyword(s):  
Crude Oil ◽  
Safety Valve ◽  
Effective Means ◽  
Cost Effective ◽  
The Novel ◽  
Successful Operation ◽  
Field Development ◽  
Coiled Tubing ◽  
The World ◽  
Marginal Field

Subsea completions are recognised worldwide as a cost effective means of developing marginal reservoirs, accelerating production and draining reservoir extremities which cannot be reached from conventional platforms. To date, more than 280 subsea completions have been installed around the world. Cobia 2, the first subsea completion in Australian waters, commenced production in Bass Strait in June 1979. It continued to produce until April 1983, when it was shut-in following the commencement of production from the Cobia platform. In its four years of operation, the well produced over 280 megalitres (1.78 million barrels) of crude oil, with peak well rates reaching as high as 750 kilolitres per day in the latter stages of its producing life. Overall, Cobia 2 has been a technical and commercial success.The need for regular pumpdown or TFL ('through flowlines') wax-cutting operations in the flowlines to maintain high levels of production generated a great deal of confidence in the use of TFL techniques for routine and non-standard subsea well servicing. In an industry 'first', TFL methods were developed to lock open and seal a leaking subsurface safety valve and, within it, set a special insert subsurface safety valve. This work allowed the well to be returned to production in a situation where a conventional workover of the well was not feasible.Other well-servicing techniques developed during the Cobia 2 project involved the novel use of a coiled tubing unit to retrieve TFL tools which had become stuck in the flowlines during the wax-cutting operations.The highly successful operation of Cobia 2 has proved the viability of this type of completion for marginal field development in Australia.

Design of Steel Lazy Wave Riser for External Turret Moored FPSO

2019 ◽  
Author(s):  
Jingyun Cheng ◽  
Peimin Cao
Keyword(s):  
Water Depth ◽  
Optimal Solution ◽  
Cost Effective ◽  
Fatigue Performance ◽  
Effective Solution ◽  
Field Development ◽  
Riser Design ◽  
Preferred Solutions ◽  
Design Challenges ◽  
Selection Of

Abstract The external turret moored Floating Production Storage and Offloading system (FPSO) is one of the preferred solutions for deepwater fields in mild to moderate environments and far away from existing pipeline infrastructures. This paper presents a design of steel lazy wave riser (SLWR) system for an external turret moored FPSO in the water depth of 1,500 meter. The design challenges and feasibility are discussed. Due to the complexity of SLWR geometry, a systematic configuration approach is introduced to achieve the desired riser extreme and fatigue performance target, as well as external turret layout. The study includes the standardized FPSO, the selection of turret configuration, and riser design. The titanium taper stress joints and the interaction with turret structure are also studied. The study provides an optimal solution of the integrated turret, mooring and riser system. It concludes that external turret FPSO with SLWRs can be a feasible and cost effective solution for field development in mild to moderate environments.

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