Reserves Estimation and Classification Challenges in a Mature Oil Field

Zubari, Hisham; Kumar, Kandaswamy

doi:10.2523/105113-ms

Proceedings of SPE Middle East Oil and Gas Show and Conference 2007

DOI: 10.2523/105113-ms

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Reserves Estimation and Classification Challenges in a Mature Oil Field

Hisham Zubari¹,

Kandaswamy Kumar²

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractEstimation of hydrocarbon reserves is governed by natural, technological and economic factors. Re-estimations and reviews continue almost till the end of exploitation in many instances. Estimation of oil reserves, when a field is in its initial stages of development is a relatively easy task. The estimation will not invite critical or close scrutiny, as the oil production at that stage is far lower than the reserves calculated. However as the field matures an… Show more

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Cited by 3 publications

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Challenges of Producing Middle East Oilfields During the Maturation Stage—A Paradigm Shift

Al-Mahroos¹,

Zubari²

2009

SPE Middle East Oil and Gas Show and Conference

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The Middle East oil fields provide an important energy source for the world. They hold two-third of the world oil reserves (Figure: 1, Table: 1), provide one-third of the world's oil supplies and have the highest Reserves to Production ratio in the world of 82 1 . Even though most of the Middle East oilfields are still prolific, many are already approaching the end of their primary stages as evident by increasing trends in water and gas productions. This is a natural process caused by maturation whereby a depleting oil reservoir looses its energy which results in oil productivity decline associated with intrusion of aquifer water and gas cap gas, when present. The challenge would be to transform the operation from Primary production to Secondary and Tertiary. This not only requires a change in the operation, but also a paradigm shift in reservoir management style and approach. This requires the identification of the pertinent issues and challenges that need to be resolved early and subsequently setting a roadmap plan to investigate, experiment and devise solutions. It also requires a quick, efficient and effective decision making process supported by modern corporate management style.In this paper we attempt to document the Primary to Secondary and Tertiary transition experience based on the 77 years old Maturing Bahrain Field which was the first oil discovery in the southern part of the Arabian Gulf. The paper does not discuss in detail the decision making process and the corporate management styles of mature field operation.

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Challenges of Producing Middle East Oilfields During the Maturation Stage—A Paradigm Shift

Al-Mahroos¹,

Zubari²

2009

SPE Middle East Oil and Gas Show and Conference

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Increasing Production from a Shallow, Underdeveloped Reservoir in the Bahrain Field with Combination of Reservoir Analysis and Geochemistry

Abdulla¹,

Nedham²,

Ansari³

2009

SPE Middle East Oil and Gas Show and Conference

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Ever since the Bahrain field was discovered in 1932, the main focus of effort was on major formations of the field, leaving shallow formations not fully exploited. Today with the increase in oil price and the depletion of major formations, there is a greater preparedness to consider increasing production from these under developed zones.This case study was initiated with the purpose of increasing production from the Magwa zone, which is the most economically attractive of the shallow zones. The zone is the basal member of the Rumaila formation of the middle Cretaceous Wasia group. It is predominantly limestone with interbeded shale.This case study shows an integrated methodology to enable a better understanding of the reservoir production behavior and to explain the lateral heterogeneity of the formation. This investigation was triggered by the variation in the formation water salinity from North to South. Water saturation maps, production history, geochemistry and structure set-up were used as the main input in this analysis. The interpreted relations and trends between these factors were used to explain the behavior of the reservoir. The outcome of such investigations is of critical value in determining the location of new development wells, selecting candidate wells for workover and for EOR processes. This paper will explain how a better understanding of the reservoir through data integration has resulted in a significant increase in oil production.

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Successful Partnership to Rejuvenate a Mature Field

Zubari

Kershaw

Qassab

et al. 2015

SPE Middle East Oil &Amp; Gas Show and Conference

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The Bahrain field, first discovery in the southern part of the Arabian Gulf region, has been on continuous production since 1933. Production peaked at 78,000 bopd in 1970. Although many reservoirs have reached mature stages, considerable volumes of oil resources remain unexploited due to the difficult nature of the rock and fluids, complicated by heterogeneities, complex fluid distribution, unfavorable rock-fluid characteristics and compartmentalization, to name a few. The keys to unlock the potential of the Bahrain field lie in 1) understanding surface and subsurface production problems of each of the reservoirs1, 2) attracting the right expertise in the field of Enhanced Oil Recovery (EOR), and 3) attracting large investments to debottleneck and expand facilities, test EOR pilots, and implement new technologies2.

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Reserves Estimation and Classification Challenges in a Mature Oil Field

Cited by 3 publications

References 4 publications

Challenges of Producing Middle East Oilfields During the Maturation Stage—A Paradigm Shift

Challenges of Producing Middle East Oilfields During the Maturation Stage—A Paradigm Shift

Increasing Production from a Shallow, Underdeveloped Reservoir in the Bahrain Field with Combination of Reservoir Analysis and Geochemistry

Successful Partnership to Rejuvenate a Mature Field

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