Successful Partnership to Rejuvenate a Mature Field

Zubari, Hisham; Kershaw, Andrew; Qassab, Mohammed Al; Muhanna, Nadeem

doi:10.2118/172682-ms

SPE Middle East Oil &Amp; Gas Show and Conference 2015

DOI: 10.2118/172682-ms

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Successful Partnership to Rejuvenate a Mature Field

Hisham Zubari

Andrew Kershaw

Mohammed Al Qassab

et al.

Abstract: 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 pot… Show more

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A Low-Density Direct Emulsion (DE) System has been Successfully Formulated for Mature Depleted Fields

Collins

Chumakov

2016

IADC/SPE Drilling Conference and Exhibition

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A low-density direct emulsion (DE) system has been successfully formulated to minimize formation damage in mature depleted fields. Key objectives for the DE system are to provide all the functions of traditional reservoir drill in fluids (RDF) in terms of efficient cutting suspension and carrying characteristics, effective fluid loss control and friction coefficient, while minimizing overbalance on depleted formations. Excessive overbalance on the formation would potentially cause severe losses and could result in formation damage, with negative impacts on the environment, and an increase in overall fluid cost. This novel oil-in-water DE system consists of a dispersion with oil as the internal phase, and water as the external phase. It targets densities less than 8.17 lb/gal to minimize overbalance on the formation while providing all the benefits of an emulsion system – enhanced friction reduction, effective fluid-loss control, superior rheology for hole cleaning and minimal ECD, and effective clay inhibition. Numerous attempts of using DE systems in oil field drilling fluids have been made in the past. However, DE systems have never been fully accepted in industry due to difficulties maintaining the emulsion stability and its sensitivity to common contaminants. A novel thermodynamically stable DE system has been successfully formulated and used to drill a well with no excessive losses or emulsion stability issues. The paper will present a detailed study of the laboratory development of the DE system along with field application data and lessons learned.

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A Low-Density Direct Emulsion (DE) System has been Successfully Formulated for Mature Depleted Fields

Collins

Chumakov

2016

IADC/SPE Drilling Conference and Exhibition

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Integrated Reservoir Study to Maximize Oil Recovery by Optimizing Shuaiba Dump Flooding into the Kharaib Reservoir

Mahmoud¹,

Khayami²,

Mansoor³

et al. 2019

Day 3 Wed, November 13, 2019

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A significant number of Kharaib horizontal and deviated producers drilled over the last decade have suffered from casing leaks, with many occurring in the first two years of production due to the exposure to highly corrosive water from the overlying giant water-bearing formation known as Shuaiba formation, resulting in production losses and water dumping from Shuaiba formation into the Kharaib reservoir through these damaged wellbores. This paper investigates the impact of Shuaiba dump flooding on the Kharaib reservoir’s performance, the integrated reservoir management study that was conducted and the implementation of the study’s findings to achieve the best results. Severe casing leaks are the main production problems facing the Kharaib reservoir. A few repairs were attempted initially, however, high costs and failure rates led to a decision to cement squeeze all remaining casing leak wells, recomplete them in shallower reservoirs, and drill new replacement wells. All new Kharaib wells were designed with an extra casing to protect against the Shuaiba reservoir’s corrosive water. Although there are no longer any casing leak wells in Kharaib, their impact remains. The pre-casing leak production numbers and well counts are yet to be matched, and there is a large volume of hydrocarbons to be produced from the Kharaib reservoir. In addition, wells that are offset of old casing leak wells showed an increase in water cut, while the performance of new wells drilled down-structure of casing leak wells suffered from early water breakthrough. There is also strong evidence that the isolation in many casing leak wells, performed during the recompletion workovers, may be unsuccessful. All these factors indicate that dump flooding is likely ongoing in the Kharaib reservoir. The consequences of dump flooding have not all been negative. An increase in average reservoir pressure and a strengthening of the reservoir’s weak water drive mechanism were observed. Currently, many wells have shown an increase in oil production, while other wells have shown steady oil production with a very gentle decline which is particularly reflected in wells located up-structure of the casing leaks. As a result of the study, many wells have been drilled in carefully selected locations in order to take advantage of the flooding, and the results of the study concluded a sustained production with a low water cut. Moving forward, there are further opportunities to increase the recovery factor by mitigating the unwanted effects of Shuaiba dump flooding and utilizing the phenomenon to its best potential.

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Successful Partnership to Rejuvenate a Mature Field

Cited by 2 publications

References 3 publications

A Low-Density Direct Emulsion (DE) System has been Successfully Formulated for Mature Depleted Fields

A Low-Density Direct Emulsion (DE) System has been Successfully Formulated for Mature Depleted Fields

Integrated Reservoir Study to Maximize Oil Recovery by Optimizing Shuaiba Dump Flooding into the Kharaib Reservoir

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