Hydrocarbon Resource Development Decision for Gas Reservoir with 10ft Oil Rim: Niger Delta Case Study

Balogun, Olalekan; Adepoju, Yaqub; Ogbuli, Andrew; Awa, Chukwunweike

doi:10.2118/178382-ms

Cited by 6 publications

(1 citation statement)

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“…They proposed the use of horizontal wells for production, and gas-recycling/re-injection in the oil zone to impede the bottom aquifer and improve the sweep efficiency. Balogun et al (2015) employed analytical and simulation methods to study the development of a 3 m-thick oil rim reservoir overlain by a huge gas cap in the Niger Delta. They considered two development scenarios, sequential and concurrent oil and gas production, and their results indicated that the development of the oil rim was not economically feasible and therefore recommended a gas-only development strategy.…”

Section: Introductionmentioning

confidence: 99%

Integrated reservoir management in a Niger Delta oil rim field

2020

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Several hundred million barrels of oil and trillions standard cubic feet of gas are enclosed within the oil rim reservoirs in the Niger Delta. The low recovery from these reservoirs can be attributed to the excessive early water and gas breakthrough at the wells which requires immediate attention. However, the majority of oil rims are thinly bedded and exist between strong aquifers and large gas caps which make preventing water and gas coning a very difficult task. The best approach to optimize production from these oil rims is effective reservoir management which involves evaluation, monitoring, goal setting, and revision of a few strategies for efficient field development. Current strategies to lessen these problems are limited due to their complexities and low recovery factor. This paper presents an integrated reservoir management approach for improved exploitation of an oil rim reservoirs in the Niger Delta. Seven development strategies were evaluated using Net-Present Value (NPV), Internal Rate of Return (IRR), and Discounted Payout Period (DPOP) criteria. In all these strategies, well placement, number of years of production, and production cycle were considered uncertain. The results show that well placement has a significant impact on efficient oil rims development. Therefore, by using a 1500 ft horizontal well, and a concurrent ABOUT THE AUTHORS

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Section: Introductionmentioning

confidence: 99%

Integrated reservoir management in a Niger Delta oil rim field

2020

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Rapid screening of oil-rim reservoirs for development and management

Lawal¹,

Yadua²,

Ovuru³

et al. 2019

J Petrol Explor Prod Technol

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As an improvement over existing screening techniques, we introduce the relative mobile energy of primary gas-cap to the aquifer (E gw) as a new parameter for characterizing the performance of oil-rim reservoirs. E gw integrates key static and dynamic reservoir properties. To account for the time value of production, the framework allows maximizing the discounted recovery factor (DRF) of oil, gas or total hydrocarbon as the objective function. Employing detailed simulations of different well-defined oil-rim models, DRFs of oil, gas and total hydrocarbons have been correlated against E gw for common development concepts and well types. These correlations have resulted in a new screening technique for both green and brown oil-rim reservoirs. In addition to presenting simple generic charts for quick evaluation of oil-rim reservoirs, the main contributions of this work include the introduction of E gw as a new performance-characterizing parameter, and the flexibility to consider the DRF of any of oil, gas or total hydrocarbon as the basis for screening an oil-rim reservoir for development planning and field management. Using the example of a brown oil-rim reservoir, the applicability and robustness of the new screening technique are demonstrated.

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Thin Oil Rim Development in a Mature Field – An Okan Field Experience

Ogbuagu¹,

Afolayan²,

Esan³

et al. 2017

Day 2 Tue, August 01, 2017

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This paper summarizes the strategy adopted in the development of two thin oil rim reservoirs in Okan Field, Offshore Niger Delta, Nigeria. Its objective is to elucidate the strategy, engineering analyses, subsurface assessment and production procedures set in place to optimally develop the reservoirs. Both reservoirs have oil thickness of <30 ft with gas thickness of >100 ft. The adopted development strategy for the two reservoirs involves the drilling of 4 wells, 2 in each reservoir, to drain the remaining oil reserves, prior to gas development. Because of structural and fluid contact uncertainties, soft landing was incorporated into the well designs. Shale-to-shale correlation was used for accurate horizon depth prediction and detailed simulation models with local grid refinements were employed to determine optimum well orientation, landing depth, lateral length and aquifer properties. Details on their use to maximize value are shared. While drilling, Azithrak™, a Baker Hughes tool, was used in geosteering the lateral well section to determine distance of well to nearest conductive zone as part of the oil-water contact tracking. All available data - logs, cuttings, reservoir pressures and production data - was incorporated and used to validate fluid contacts data because of the impact of landing depth relative to the fluid contacts on oil recovery. Simulation results and operational constraints were used to set acceptable production limits to ensure delivery of target reserves. All the four wells have been successfully drilled and completed, with the wells landed successfully within the thin oil column, at the optimized distance from the fluid contacts, with the wells producing at <0.55 percent water cut. Initial production performances of the four wells are in line with static and dynamic assessment forecasts. Lessons learned and challenges encountered during this development are also captured in this paper.

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Hydrocarbon Resource Development Decision for Gas Reservoir with 10ft Oil Rim: Niger Delta Case Study

Cited by 6 publications

References 0 publications

Integrated reservoir management in a Niger Delta oil rim field

Integrated reservoir management in a Niger Delta oil rim field

Rapid screening of oil-rim reservoirs for development and management

Thin Oil Rim Development in a Mature Field – An Okan Field Experience

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