Meeting the Challenges in Alkaline Surfactant Pilot Project Implementation
at Angsi Field, Offshore Malaysia

Othman, Mohamad Hashim; Chong, Mizan Omar; Sai, Rithauddin M; Zainal, Suzalina; Yaacob, Aisha Ashikin; Zakaria, M Sukri

doi:10.2523/109033-ms

Cited by 4 publications

(3 citation statements)

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“…Also in offshore, there is few documented field application of chemical EOR methods in the literature. For example, only single-well alkali-surfactant-polymer (ASP) in Lagomar Field, Venezuela (Manrique et al, 2000) and in Angsi Field, Malaysia (Othman et al, 2007) is documented.…”

Section: History Of Chemical Flooding In Fractured Carbonate Reservoirsmentioning

confidence: 99%

Pilot Testing Issues of Chemical EOR in Large Fractured Carbonate Reservoirs

et al. 2011

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Many world class large carbonate reservoirs leave behind at least half of the initial oil in place. Typically water injection is used to improve oil recovery while gas injection is used to maintain pressure or to promote oil gravity drainage. Immiscible gas injection, including injection of CO 2 , has been considered but not implemented on a large scale for economic reasons. Furthermore, interest in using surfactants in large carbonate reservoirs has recently flourished. As a result, we began to investigate the viability of designing and conducting a manageable pilot test program in a large fractured carbonate reservoir using a single-well, dual-completion system to evaluate the efficacy of the surfactant oil mobilization and oil capture. However, pilot testing in large reservoirs is very expensive and requires a long time to complete. These issues are less problematic in pilot testing of small and thin reservoirs in onshore field. In this paper we will present the results of a conceptual model to simulate the performance of surfactant flooding in the above-mentioned pilot test configuration. Three different model formulations, having different approaches to gridding and grid-refinement, were used. These include conventional dual-porosity, dual-permeability, and single-porosity models with variable porosity and permeability to simulate fracture-matrix interactions. Simulation of pilot tests using dual-porosity models shows that gravity is most effective during waterflood but not as effective during the surfactant injection while in the dual-permeability models, the surfactant oil recovery is greater because both gravity and viscous displacement contribute. We will explain the reasons and will indicate which model is more reliable. In general the results of this study give an insight into the viability of using surfactant injection in thick carbonate reservoirs both in the pilot and production stage.

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Section: History Of Chemical Flooding In Fractured Carbonate Reservoirsmentioning

confidence: 99%

Pilot Testing Issues of Chemical EOR in Large Fractured Carbonate Reservoirs

et al. 2011

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“…The screening study on seventy two reservoirs has identified almost a billion barrels of additional reserves can be achieved through EOR (Samsudin et al, 2005). The Chemical Enhanced Oil Recovery (CEOR) was identified as one of the key EOR processes that have good potential for field implementation to increase ultimate recovery in Malaysian oil fields (Othman et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Design and Application of a New Acid-Alkali-Surfactant Flooding Formulation for Malaysian Reservoirs

Elraies

Tan

2010

All Days

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A new Acid-Alkali-Polymeric Surfactant (AAPS) flooding formulation has been developed to overcome the precipitation problems caused by the divalent metal cations prevalent with conventional ASP flooding. The acid was evaluated in an acidalkali-surfactant formulation using sodium carbonate and introducing a new polymeric surfactant derived from Jatropha oil. The effect of the new formula on IFT, viscosity, and oil recovery was studied using natural seawater having a large quantity of divalent metal cations. The tolerance of the AAPS towards natural untreated sea water was monitored for 90 days at 90 o C. No precipitations were formed with the acid additive, while precipitations were always generated without the acid. A combination of the new system was found to significantly reduce the IFT between Angsi crude oil and AAPS solution. The most outstanding feature of the AAPS formulation lies in its viscosity insensivity towards an increasing alkali concentration up to 1.2%. Core flood tests with alkali and acid concentrations of 0.6% and 1% respectively confirmed an optimum surfactant concentration of 0.6%. Using the optimum AAPS concentrations, another series of core flood were conducted by changing the injection volume. Only a small incremental recovery was obtained with AAPS slugs higher than 0.5 PV. Injection of 0.5 PV of the formulated AAPS slug followed by chase water produced an additional 18.8% OOIP over water flooding. The benefit of the new system is the use of seawater rather than softened water while maintaining the desired slug properties.

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“…o Single-well Alkali-Surfactant (AS) combined with single-well partitioning tracers before and after the AS injection was successfully evaluated in Angsi Field, offshore Terengganu, Malaysia [293].…”

Section: Eor Offshorementioning

confidence: 99%

Enhanced Oil Recovery: An Update Review

2010

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With the decline in oil discoveries during the last decades it is believed that EOR technologies will play a key role to meet the energy demand in years to come. This paper presents a comprehensive review of EOR status and opportunities to increase final recovery factors in reservoirs ranging from extra heavy oil to gas condensate. Specifically, the paper discusses EOR status and opportunities organized by reservoir lithology (sandstone and carbonates formations and turbiditic reservoirs to a lesser extent) and offshore and onshore fields. Risk and rewards of EOR methods including growing trends in recent years such as CO 2 injection, high pressure air injection (HPAI) and chemical flooding are addressed including a brief overview of CO 2 -EOR project economics.

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Meeting the Challenges in Alkaline Surfactant Pilot Project Implementation at Angsi Field, Offshore Malaysia

Cited by 4 publications

References 0 publications

Pilot Testing Issues of Chemical EOR in Large Fractured Carbonate Reservoirs

Pilot Testing Issues of Chemical EOR in Large Fractured Carbonate Reservoirs

Design and Application of a New Acid-Alkali-Surfactant Flooding Formulation for Malaysian Reservoirs

Enhanced Oil Recovery: An Update Review

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