Subsea Long-Distance Tie-Back

Wiles, Douglas Peter; Widjaja, Ervina; Davalath, Janardhan

doi:10.4043/29319-ms

Cited by 3 publications

(1 citation statement)

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“…In the past decades, significant technological advances have enabled long-distance tiebacks for development projects. Some recent technological advancements include Davalath & Wiles (2017), Gassert et al (2019), Mikalsen & Loper (2019), Wiles et al (2019), Rajaratnam et al (2020), and (Bacati et al 2020), but will not be further elaborated on here. Karimaie et al (2018) provided a technical evaluation of the feasible development concepts for selected oil discoveries in the Barents Sea; Goliat, Johan Castberg, Alta, Gohta, and Wisting.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of tieback developments for marginal oil fields with timing flexibility

Fedorov,

Hagspiel,

Rogstad

et al. 2024

Energy Economics

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Section: Introductionmentioning

confidence: 99%

Evaluation of tieback developments for marginal oil fields with timing flexibility

Fedorov,

Hagspiel,

Rogstad

et al. 2024

Energy Economics

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Optimizing Gas Condensate Subsea Tiebacks: Lessons Learned from Unload to Host Operations

Zhang,

Shepherd

2024

Apogce 2024

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Gas condensate subsea tiebacks increasingly favor Unload to Host (U2H) operations over traditional Unload to Rig for enhanced execution efficiency and cost reduction. They further eliminate the need for temporary floating production units to partially unload wellbore liquids/solids and introduce first gas with flaring. While U2H brings significant benefits like HSE risk mitigation, it also poses integrity and operability challenges to new and existing facilities. This paper will present case studies and lessons learned from U2H operations conducted on multiple gas condensate subsea tiebacks. Key focus areas include understanding the impact of U2H fluid composition on LNG production, selecting subsea preservation liquids to balance hydrate and corrosion risks, and optimizing liquid handling and inventory management at host facilities. Additional considerations cover solids management during wellbore and pipeline transport, solids filtration at host facilities, and effective production chemistry management with a tailored sampling plan and temporary chemical injection package readiness. The outlined learnings emphasize the critical need for upfront planning on U2H operation, advocating an integrated multidisciplinary approach to influence new facilities designs as well as to minimize last-minute changes during execution. Overall, the aim of this work is to highlight operational excellence for flow back to host where asset integrity and production optimization can assist to unlock value if risks are well-understood and managed.

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Integrated Active Heating and Subsea Boosting Technologies to Unlock Long Tie-Back Reservoirs with Flow Assurance Challenges

Jez¹,

Eretveit

Lazarczyk³

et al. 2022

Day 4 Thu, May 05, 2022

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Subsea oil and gas production can utilize a number of technical solutions to ensure efficient and cost- effective operation. There are two main technologies applied to address flow assurance challenges in case of particularly long tieback reservoirs: subsea active heating and subsea boosting. The production from distant reservoirs with challenging flow assurance conditions may require application of both mentioned systems. In such case, one challenge relies on the selection of a power supply infrastructure for both systems, considering all possible optimization aspects. In the conventional approach, the implementation of both systems is realized independently. Subsea active heating system and subsea boosting system are supplied and monitored from topside by the separate power strings. However, the development of subsea technologies allows to review the approach and consider integration of both systems, enabling reduction of topside infrastructure for general cost savings. The purpose of this article is to present the integrated system composed of Electrically Trace Heated Pipe in Pipe (ETH-PIP) and subsea boosting pumps where Variable Speed Drive (VSD) is required. The role of both system is shortly presented. Next, a proposal of an integrated power system for subsea heating and boosting is illustrated and discussed on a case study example. The analysed field layout is characterized by a long tie-back to a production facility where both subsea boosting and active heating systems are necessary operating in the relevant power modes. The results of analysis allow to conclude that the presented solution can be valuable alternative to traditional approach of complex subsea system topologies.

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Subsea Long-Distance Tie-Back

Cited by 3 publications

References 0 publications

Evaluation of tieback developments for marginal oil fields with timing flexibility

Evaluation of tieback developments for marginal oil fields with timing flexibility

Optimizing Gas Condensate Subsea Tiebacks: Lessons Learned from Unload to Host Operations

Integrated Active Heating and Subsea Boosting Technologies to Unlock Long Tie-Back Reservoirs with Flow Assurance Challenges

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