IOR Potential with Updip Water Injection in the Statfjord Fm at the Statfjord Field

The goal of an oil field development project is to accelerate the hydrocarbon production and maximize the recovery at a lowest cost. For a thin oil rim reservoir with a large gas cap on top and a strong aquifer below, achieving such goal can be very challenging since recovery of both oil and gas shall be maximized. A successful project shall entail plan first to accelerate the oil production maximizing the oil recovery prior to the gas cap blow-down.The maximum oil recovery factor achievable in thin oil rim reservoirs was evaluated for a Malaysian thin oil rim reservoir. The force balance between the gas cap expansion, aquifer expansion and viscous withdrawal was demonstrated by showing the model simulated water-oil and gas-oil contact movement. The understanding of the force balance progressively guided the field development project team to selectively re-activate some of the idle wells, to selectively place new additional infill horizontal wells, and to plan selective water and gas injection in key reservoir sectors.In this paper, the concept and strategy of water injection for a subject thin oil rim reservoir was delineated. Placement of a system of water injectors at the selected sector periphery and at the gas oil contact was studied. Together with optimization of infill well placement and the selected idle well reactivation, this effort showed a potential of improving the current recovery factor from 35% up to 51%, way beyond the maximum theoretical vertical displacement efficiency. In addition, it can be shown that successful water injection can improve productivity of production wells due to increasing near wellbore oil saturation. TX 75083-3836, U.S.A., fax +1 -972-952-9435

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“…The art of maximizing oil recovery of a thin oil rim reservoir is to keep oil rim in contact with producing wells at all time. [5][6][7]. 3).…”

Section: Improving Oil Recovery By Water Injectionmentioning

confidence: 99%

Breaking Oil Recovery Limit in Malaysian Thin Oil Rim Reservoirs: Water Injection Optimization

2011

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“…Further more, it can be illustrated that the balance could also be managed by injection water at the periphery or at and above the GOC (Ref. [4][5]. In addition, produced gas can also be injected in the oil rim to enhance the oil recovery (Ref.…”

Section: Force Balance In Thin Oil Rim Reservoirsmentioning

confidence: 99%

Risk of Losing Oil Reserve by Gas-Cap Gas Production in Malaysian Thin Oil Rim Reservoirs

Razak¹,

Chan²,

Darman³

2010

Proceedings of International Oil and Gas Conference and Exhibition in China

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For a thin oil rim reservoir with a large gas cap on top and a strong aquifer below, the art of optimizing the oil recovery is to keep the oil rim in continuous contact with the producing wells in the oil rim. Therefore, the management of gas-oil contact and water-oil contact movement is extremely critical. To achieve the maximum results, force balance between aquifer drive, gas cap expansion, and viscous withdrawal (production) shall be carefully studied for a given reservoir at various stages of the production life cycle.In this paper, the risk of losing oil rim oil to the gas cap when the force balance is impaired by weakening gas cap energy due to gas production is illustrated. This condition can also be observed due to impaired water injection or the improper placement of water injection wells.For thin oil rim reservoirs with significant oil reserve, the strategy of hydrocarbon exploitation should be producing the oil rim oil first and then blowing down the gas-cap later to maximize hydrocarbon recovery (Ref.1). For this reason, most of the produced gas shall be re-injected to the reservoir to keep the proper force balance and to enhance the improved oil recovery (IOR) options such as infill wells, water injection and enhanced oil recovery. Model simulation studies can demonstrate that the IOR benefit can severely reduced by producing gas-cap gas. A correlation between IOR recovery factor and gas cap gas withdrawal volume, for a particular thin oil rim reservoir in Malaysia, is shown and proposed.

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“…Reservoir simulation models, both element models and full field models, have been built for the Brent, Dunlin and Statfjord reservoirs, and are used in the evaluation of drainage strategies 4,5,13 . They are also, to some extent, used for generating long-term production prognoses on a field scale.…”

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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IOR Potential with Updip Water Injection in the Statfjord Fm at the Statfjord Field

Cited by 11 publications

References 4 publications

Breaking Oil Recovery Limit in Malaysian Thin Oil Rim Reservoirs: Water Injection Optimization

Breaking Oil Recovery Limit in Malaysian Thin Oil Rim Reservoirs: Water Injection Optimization

Risk of Losing Oil Reserve by Gas-Cap Gas Production in Malaysian Thin Oil Rim Reservoirs

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

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