Evaluation of the potential application on the WAG process in a North Sea reservoir

Olsen, G.; Skauge, Arne; Stensen, Jan Åge

doi:10.3997/2214-4609.201411206

Cited by 8 publications

(2 citation statements)

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“…Laboratory experiments have been used to study the effect of various parameters such as WAG slug size, WAG ratio (tapering), number of WAG cycle and injection flow rate on the performance of WAG [53,54,73,[83][84][85][86][87][88][89]. In general, these parameters show strong effects on the oil recovery trends of a WAG injection.…”

Section: The Mechanisms and Factors Influencing Wag Floodingmentioning

confidence: 99%

Miscible Displacement Oil Recovery

Hinai¹,

Saeedi²

2022

Enhanced Oil Recovery - Selected Topics

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Miscible gas injection (MGI) is an effective enhanced oil recovery (EOR) method used worldwide often for light oil recovery. In the petroleum industry, many MGI processes typically involve injection of an associated gas (AG) mixture or CO2, which have both been recognised as excellent candidates for such processes. The initial part of this chapter provides a broad introduction and background to the EOR techniques used worldwide as well as those implemented in Oman oil fields and briefly discusses their critical importance. Oman is one of the most active countries in terms of successful MGI processes in the Middle East, hence the emphasis given in this chapter to such projects in this country. The second part covers the technical details of the MGI process and the potential problems and challenges associated with it, while the third part focuses mainly on the common techniques used to control gas mobility during gas flooding including MGI. The impediments and challenges for wider application of the mobility control techniques are also covered. The last section presents a sample feasibility evaluation for a real oil field around the implementation of mobility control techniques for an MGI process.

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Section: The Mechanisms and Factors Influencing Wag Floodingmentioning

confidence: 99%

Miscible Displacement Oil Recovery

Hinai¹,

Saeedi²

2022

Enhanced Oil Recovery - Selected Topics

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“…Water-alternating-gas (WAG) injection has significant recovery potential for North Sea oilfields and is included in many development scenarios (Skontorp and Kristensen 1990;Olsen et al 1991;Hinderaker et al1 992). Large-scale implementation is likely to raise new problems and questions about injection schemes, optimization, and efficiency improvement.…”

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confidence: 99%

SAGA injection: a new combination IOR process for stratified reservoirs

Hanssen

Surguchev

Svorstøl

et al. 1995

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Specific features of North Sea sandstone reservoirs and reservoir fluids determine quite special conditions for water-alternating-gas (WAG) injection which must be taken into account when tuning WAG parameters for the particular stratification and anisotropy of a heterogeneous reservoir. Combining advantages of waterflooding and gas injection, WAG can be very effective in stratified reservoirs. Even so, gravity segregation and early breakthrough may cause poor sweep, especially in reservoirs with low restriction to the cross-flow within the layers and with low permeable layers underlying high permeable layers. The first part of this paper presents results of WAG prediction and process tuning for a reservoir of this class. The second part introduces a new process for selectively controlling injectant flow, surfactant-alternating-gas-ameliorated (or SAGA) injection, which may yield further improvement. In this process, a foaming surfactant added to part of a water half-cycle preferentially enters the swept region. Foam that is generated by gas/surfactant displacement in a subsequent gas half-cycle will block or reduce further entry of gas and water into the high permeable layer, diverting injectant to unswept layers as the reservoir is maintained on WAG flood. Analytical estimates and numerical simulations indicate positive effects of SAGA injection on oil recovery and GOR over WAG injection. Simulation results quantifying the effect of foam plugging, injection parameters and time factor on WAG performance are discussed. Experiments in a physical stratified reservoir model demonstrate the selective placement of foamer, foam-plug generation, and effectiveness of the combined action of WAG and foam. The visualization of physical model experiments is essential for demonstrating foam process mechanisms and is useful in illustrating segregation and viscous/gravity effects in SAGA injection.

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Enhancing oil recovery through immiscible water-alternating-CO2 in tight oil formations—a case study of Yaoyingtai Field in China

Liu

Chen

et al. 2021

Arab J Geosci

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Evaluation of the potential application on the WAG process in a North Sea reservoir

Cited by 8 publications

References 0 publications

Miscible Displacement Oil Recovery

Miscible Displacement Oil Recovery

SAGA injection: a new combination IOR process for stratified reservoirs

Enhancing oil recovery through immiscible water-alternating-CO2 in tight oil formations—a case study of Yaoyingtai Field in China

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