Optimized Well Completion Design in the Statfjord Field,North Sea

Kostøl, Petter; Rasmussen, J.H.

doi:10.4043/7327-ms

Cited by 4 publications

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“…A strong focus on both increasing recovery and reducing cost is necessary to extend field life. Improved oil recovery techniques such as extended reach drilling 6 , multilateral wells 7 , improved completion design 8,9 and WAG 3 have already been implemented in the field. Continuous attention towards development of new technology and its application is required in the future.…”

Section: Optimisation Of the Drilling Programmementioning

confidence: 99%

Optimisation of an Aggressive Drilling Programme at the Statfjord Field - Maximising Production in a Mature Field

Anne-Grethe¹,

Atle²,

Arnesen³

et al. 2002

Proceedings of European Petroleum Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe giant Statoil-operated North Sea oil field Statfjord is currently far down its production decline curve. During 23 years of production more than 60% of the STOOIP has been recovered, and the remaining reserves are characterized by complex distributions of oil, water and gas.In order to obtain a cost-effective production of the remaining oil, an aggressive drilling and intervention programme is necessary. The main challenge that the geoscientists and reservoir engineers face in this scenario is to identify remaining oil in targets becoming increasingly smaller, more complex and more uncertain, and to drain these in the most profitable manner. This paper reviews the working method that has been used at the Statfjord Field when defining a drilling schedule. It shows how the different work processes are linked, starting with the identification of possible new well locations, continuing with the estimation of reserves and risk evaluation and ending up with final drilling projects.

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Section: Optimisation Of the Drilling Programmementioning

confidence: 99%

Optimisation of an Aggressive Drilling Programme at the Statfjord Field - Maximising Production in a Mature Field

Anne-Grethe¹,

Atle²,

Arnesen³

et al. 2002

Proceedings of European Petroleum Conference

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Completion and Workover of Horizontal and Extended-Reach Wells in the Statfjord Field

Kostøl

Østvang

1995

SPE Drilling &Amp; Completion

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This paper gives a short introduction to the Statfjord field and background for extended-reach-drilled (ERD) and horizontal wells. We reviewed experiences with completion and workovers of horizontal and ERD wells on Statfjord. Ten horizontal wells with horizontal sections of up to 2150 m and four ERD wells with a horizontal reach of up to 7290 m were completed. Several wells were recompleted, and we performed interventions for logging purposes. We describe the development of the completion and workover techniques since the first horizontal well was drilled in 1990 to April 1994.

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Experience with Horizontal Wells in the Statfjord Field

Kostøl

Berg

1996

SPE Formation Damage Control Symposium

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The paper will review the most recent experience with completion techniques and production performance in horizontal wells in the Statfjord field. A total of 25 horizontal/extended reach wells have been drilled and completed to date. Wells with horizontal section up to 2250 m have been drilled and the longest horizontal displacement is 7290 m. Several well interventions have been performed in these wells, primarily for re-completion purposes. The paper will describe development of completion and intervention techniques with focus on perforating, well killing, well productivity and sand free production rates. Operational consequences in well interventions due to well design will be shown. The first horizontal wells were perforated in overbalance on drillpipe, while today most intervals are perforated in underbalance with coiled tubing. Production and reservoir management for these wells will be discussed with focus on requirements for data acquisition and well intervention. Future possibilities for horizontal wells on Statfjord and technology requirements will finally be discussed in the paper. Introduction The Statfjord field is located in the North sea on the Norwegian-UK boundary line. Three filly integrated production platforms with a total oil processing capacity of 132 000 Sm3/d have been installed for the field development. Each platform has two drilling shafts and a total of 42 well slots. A total of 124wells have been drilled to date, including 10 redrills. The field is one of the largest offshore fields in the world and had an average plateau production of 110–120.000 Sm3/d. Total oil reserves are estimated to be 620 × 10 6 Sm3. The field has been on declining production since 1993 and to date almost 80% of the recoverable reserves have been produced. The structural elements of the Statfjord field could, very simplified, be described as a row of several major fault blocks dipping to the west by 5 to 8 degrees. From the top of the structure and eastwards, the reservoirs are broken apart by a complex pattern of listric faults. (figure 1 & 1B). The main oil-producing reservoirs of the field are sandstones of the middle Jurassic Brent Group and the Lower Jurassic/Upper Triassic Statfjord formation. The Brent Group is divided into the Upper(Tarbert and Ness) and Lower (Etive, Rannoch and Broom) Brent formations. The Statfjord reservoir is divided into three producing formations, from the top Nansen, Erikson and Raude.

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Optimized Well Completion Design in the Statfjord Field,North Sea

Cited by 4 publications

References 0 publications

Optimisation of an Aggressive Drilling Programme at the Statfjord Field - Maximising Production in a Mature Field

Optimisation of an Aggressive Drilling Programme at the Statfjord Field - Maximising Production in a Mature Field

Completion and Workover of Horizontal and Extended-Reach Wells in the Statfjord Field

Experience with Horizontal Wells in the Statfjord Field

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