Pushing Boundaries through Simplification of Complex Carbonate Reservoir Modeling: Small Investment, Big Gains

Khor, Y. Y.; Shrivastava, SK; Borhan, Nor Aisyah; Baghdadi, F.; Motaei, Eghbal; Kadir, Zailani Abd; Supaat, Saktiandi; Anasir, Nadiah; Mithani, Aijaz Hussain

doi:10.2118/186316-ms

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…We examined the characteristics of gas flow in carbonate UGS operations by conducting simulations of injection and production processes on reservoir core plugs under irreducible water conditions. To evaluate the storage capacity mechanism, we employed the well-established material balance method, specifically the p/z plot, as described by Elahmdy and Wattenbarger (2007), Khor et al (2017), Jongkittinarukorn and Last (2019), and Payne (1996) [28][29][30][31].…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Wang,

et al. 2024

Energies

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Global demand for underground gas storage (UGS) is steadily increasing, with the limestone-based UGS system situated in the Sichuan Basin of China gathering considerable interest in recent years. However, studies focusing on the fundamental mechanisms of the injection-production process in these systems are limited. Moreover, existing studies utilizing physical experimental methods frequently fall short in effectively visualizing micro-flow or incorporating real core samples from the reservoir. To address these gaps, we performed a coreflood experiment, integrating micro-Computed Tomography (CT) scanning to investigate mechanisms of fluid flow and storage capacity during the injection and production cycles in limestone reservoirs. Our approach involved utilizing core plugs with artificially engraved fracture-vuggy structures, which mimic the characteristics of the reservoir. Micro-CT scans were performed to visualize the microscopic changes in fractured-vuggy structures and the distribution of irreducible water during each cycle. This study reveals that increased cycles correspondingly affect gas storage capacity, particularly by expanding it in relative larger vuggy structures while reducing it in finer fissure network structures. The amount of irreducible water decreases after injection-production cycles, likely being expelled alongside the extracted dry gas. This plays a critical role in expanding the storage capacity in larger vuggy systems. Conversely, there is a decrease in storage capacity within fissure network systems, as the irreducible water is replaced by gas. This leads to a reduction in the opening force of the fine conduit. The dense matrix has a very limited effect on the flow mechanism and its influence on storage capacity. Overall, these findings offer practical insights for optimizing injection and production strategies in limestone UGS systems within the Sichuan Basin, contributing to a deeper understanding and efficient utilization of this vital infrastructure.

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Section: Resultsmentioning

confidence: 99%

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Wang,

et al. 2024

Energies

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Fueling Our Future with Gas through End-to-End Integrated Optimisation of LNG Supplying Gas Fields

Chuah

Khor

Borhan

et al. 2017

Day 1 Tue, October 17, 2017

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In a complex offshore gas network covering both green and mature fields' production to LNG plants, end-to-end integration is essential in building a portfolio that can maintain output. Often in the course of identifying conceptual development opportunities by individual field, this aspect isoverlooked in the broader context of regional optimization. To provide assurance of production sustainability to meet commercial agreement, it is imperative to formulate a development plan that integrates subsurface and surface elements to accurately quantify the remaining reserves and thus the value of the asset. As such, this paper will focus on the methodology of formulating this optimized development plan to incorporate subsurface and surface network modeling and demonstrate the importance of this system for excellent asset management and future development. A series of reservoir evaluations has been performed on a simple one-dimensional model and three-dimensional model depicting the gas reservoir performance. The analysis is further enhanced by using subsurface and surface production network modeling. The key advantages of this workflow compared to the conventional field development plan (FDP) approach is that the field capacity is derived based on pressure interface and existing production constraints to capture any backpressure effects for anyinfill drilling or upgrading projects. In this field example, the integrated network model has resulted in a simpler yet more reliable technical proposal where synergistic opportunities and the associated potential production challenges can be identified.Higher level goals on production attainment and cost avoidance can be achieved through circumventing the potential production hiccups for new development. A detailed analysis workflow using real time data will be discussed as part of technical assurance.The key benefits include full field optimization and opportunities identification,and generation ofa representative business case in a timely manner to meet the demands of managing a dynamic gas system.

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Production Analysis PA and Application of Rate Transient Analysis RTA in Carbonate Oil Reservoirs for Reservoir Characterization and Connectivity

Motaei

Ataei

Ebrahim

2018

Day 4 Fri, March 23, 2018

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Analytical approaches are primary reservoir engineering techniques for understatingreservoir/well performance and reservoir characterization which creates additional value on top of comprehensive geological models. Different techniques such as Pressure Transient Analysis (PTA), Rate Transient Analysis (RTA), and analytical models provide good understating on reservoir extension and properties, reservoir connectivity and well interference signatures. For complex carbonate reservoir models, relying solely on petrophysical properties from core and LOG and calibrated is not enough. Several case studies are published where the static model is guided by seismic driven Acoustic Impedance(AI) which matched the porosity at the wellbore. These methods significantly enhance the reservoir property distribution if a reliable seismic data is available. Nevertheless, the permeability map and reservoir connectivity analysis still require detail investigation of well performances and production data. This paper discusses the application of production data analysis to characterize the reservoir in larger scale and reveal the reservoir connectivity and flow barriers in the prevailing heterogeneity. Authors addressed the integrated production data analysis including RTA/PTA, 2D numerical simulation and deconvolution technique in gas cases (Ataei et al 2017). The basic equations of RTA which requires single phase condition are still applicable in the current case study which involve oil above bubble point pressure. Simple 2D numerical simulation were used to address the challenges and the provides a solution to have better understanding of reservoir continuity, a reliable permeability map for upscaling core data and incorporating in the model into large (field scale). The calculated KH from PTA data was also integrated with that of estimated from RTA and evaluated by 2D model before integrating in into full field reservoir simulation model for future forecasting.

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Pushing Boundaries through Simplification of Complex Carbonate Reservoir Modeling: Small Investment, Big Gains

Cited by 4 publications

References 3 publications

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Fueling Our Future with Gas through End-to-End Integrated Optimisation of LNG Supplying Gas Fields

Production Analysis PA and Application of Rate Transient Analysis RTA in Carbonate Oil Reservoirs for Reservoir Characterization and Connectivity

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