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Twenty Years, One Fracture and the Future of a North Sea Asset

Authors
A. Hoq (BP Exploration) | P. Wishart (BP Exploration) | M. Findlay (BP Exploration) | A. Roy (BP Exploration) | R. Stanley (Schlumberger) | C. Giraud (Schlumberger) | J. Abbott (Schlumberger) | M. Norris (Schlumberger)
DOI
https://doi.org/10.2118/191431-18IHFT-MS
Document ID
SPE-191431-18IHFT-MS
Publisher
Society of Petroleum Engineers
Source
SPE International Hydraulic Fracturing Technology Conference and Exhibition, 16-18 October, Muscat, Oman
Publication Date
2018
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-622-5
Copyright
2018. Society of Petroleum Engineers
Disciplines
5.8 Unconventional and Complex Reservoirs, 4 Facilities Design, Construction and Operation, 3 Production and Well Operations, 4.5 Offshore Facilities and Subsea Systems, 2.5.2 Fracturing Materials (Fluids, Proppant), 3 Production and Well Operations, 4.1.2 Separation and Treating, 4.5 Offshore Facilities and Subsea Systems, 5 Reservoir Desciption & Dynamics, 4.1 Processing Systems and Design, 5.8.8 Gas-condensate reservoirs, 2 Well completion
Keywords
Offshore, Fibers, Andrew, North Sea, Hydraulic Fracturing
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Abstract

The Andrew asset is a strategic hub for BP in the Central North Sea and has been producing from the Palaeocene oil reservoir for the past twenty-two years through a small fixed platform. In addition to the conventional Palaeocene oil reserves, there is an underlying Lower Cretaceous gas-condensate reservoir. The A11z well was drilled as an appraisal well within this low permeability formation and the original completion in 1998 was designed with the intent of performing a future hydraulic fracture. Extended well tests however, identified that gas production facilities were required for production and these were not provided until platform redevelopment in 2015. The stimulation operation has been delayed since due to the highly complex interfaces on an ageing asset and prioritisation of plant reliability work scopes and other simpler intervention work scopes.

Due to the increasing strategic importance of a new black start gas well for the asset hub, the alignment of priorities between the different functions was addressed and the hydraulic fracture operations were executed in June 2018. A multi-disciplinary project team has been established with a remit to manage and simplify the work scopes, enabling an efficient stimulation operation and a safe flowback with minimal impact to the platform reliability. The optimal design for a reliable proppant hydraulic fracture treatment has been crucial to deliver this Regional objective.

The stimulation execution was one of the largest single stage proppant placements for the basin in recent history. The implementation of single mesh proppant for the entire job is a unique deployment for the Region and a novel movement in the global stimulation industry in general, as was the first application of fibres in the North Sea. In addition to the unconventional job design, the Andrew A11z stimulation has become the first proppant fracturing treatment to be executed by BP UK North Sea in twenty-two years.

The successful execution and results of this complex project demonstrates how innovative stimulation design, when combined with effective multi-disciplinary team management and guided by aligned priorities adds significant long-term value but can also extend the life of mature offshore assets and instil confidence to pursue many more similar opportunities in such environments that are all too often discarded due to perceived complexity.

File Size  3 MBNumber of Pages   32

Al Shueili, A.M., Al Manji, A. and Rylance, M. (2016). Khazzan: Making the Most of the Fracturing Sweet-Spot Between Verticals and Horizontals. SPE-179140-MS https://doi.org/10.2118/179140-MS

API-RP-19D API Recommended Practice 19D – Long term Conductivity Measurement.

Ishteiwy, O., Doghmi, A. and Rylance, M. (2016). Improving North Sea Fracturing and Stimulation Economics Through Increasing Innovation and Efficiency in Operations and Applications: Lessons Learned. SPE HFTC, The Woodlands, Houston, TX, USA, 9-11 Feb. SPE-179139-MS https://doi.org/10.2118/179139-MS

Martins, J.P., Leung, K.H., Jackson, M.R., Stewart, D.R. and Carr, A.H. 1989. Tip Screen-Out Fracturing Applied to the Ravenspurn South Gas Field Development, presented at the SPE ATCE, San Antonio, Texas, USA, Oct 8-11, SPE 19766.

Palisch, T.T., Duenckel, R J., Bazan, L.W., Heidt, J.H. and Turk, G.A. (2007). Determining Realistic Fracture Conductivity and Understanding its Impact on Well Performance - Theory and Field Examples. presented at the SPE Hydraulic Fracturing Technology Conference, College Station, Texas, 29-31 Jan. SPE-106301-MS

Clark, R. A., Al Busafi, B., Adil, I.Al Lawati, H., Huggins, P. and Rainey, S., "A Comprehensive Approach to Surveillance in Appraisal of a Tight-Gas Project in Oman", SPE Paper no. 142754, presented at SPE MEUG Conf. & Exh., Muscat, Oman, 31 Jan to 2-Feb, 2011.

Nicolaysen, A., Casero, A., Roy, A., Rylance, M., Kurniadi, S.Batmaz, T., "The Good, the Bad and the Ugly: A Case History of a Multi Stage Hydraulic Fracturing Horizontal Well Tight-Gas Development in Oman" SPE-179142 presented at SPE Hydraulic Fracturing Technology Conference held in The Woodlands, Texas, USA, 9–11 February 2016.

Rylance, M, Nicolaysen, A, Ishteiwy, O., Judd, T., Huey, T., Giffin W., "Hydraulic Fracturing: Key to Effective Khazzan-Makarem Tight-Gas Appraisal", SPE Paper no. 142783, presented at SPE MEUG Conf. and Exh., Muscat, Oman, 31-Jan to 2-Feb, 2011.

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