IOR resource potential of Norwegian North Sea sandstone reservoirs

Hinderaker, Leif; Bygdevoll, Jan; Bu, Tor; Nybråten, Gunnar; Krakstad, O.S.

doi:10.1016/0920-4105(92)90003-j

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The gas -water ratio was 1 :1, and the slug site was 2 months . The grid was (1,40,30), and the grid block site was about 100x50x2 . The average permeability was 300 mD, and the injection was phased downlip in a section with a 7 legree dip .…”

Section: Sec Gas Injection Results Are Shown Inmentioning

confidence: 99%

Simulation Studies of WAG Using Three-Phase Relative Permeability Hysterises Models

Skauge¹

1997

IOR 1997 - 9th European Symposium on Improved Oil Recovery

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A novel threc-phase relative permeability hysteresis model has Barlier been developed from experimental results. This paper has applied the three-phase hysteresis approach in simulations of three-phase flow situation and especially immiscible WAG. Three-phase gas hysteresis model allows reduced mobility of gas when water saturation is above irreducible situation. The biree-phase oil relative permeability is generated by a standard approach, but the residual oil saturation can be a function of the amount trapeed gas saturation. This enables the possibility of lower remaining oil saturation in three-phase dominated zones. The water three-phase relative permeability model has the flexibility of defining different water relative permeability for two-phase and three-phase situations, and includes an interpolation regime for transitions between two-phase and three phase zones. The three-phase relative permeability hysteresis algorithm has been used in simulation of core floods, reservoir cross-sections. The new three-phase hysteresis models show better predictions of core flood results than simulations witti no hysteresis or witti two-phase gas relative permeability hysteresis. In all the simulations, gas breakthrough is delayed and predicted oil production is increased when using the three-phase hysteresis approach compared to conventional WAG modelleng. 9th European Sym p osium on I m prove d Oil Recovery, The Hague-T h e Netherlands, 20

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Section: Sec Gas Injection Results Are Shown Inmentioning

confidence: 99%

Simulation Studies of WAG Using Three-Phase Relative Permeability Hysterises Models

Skauge¹

1997

IOR 1997 - 9th European Symposium on Improved Oil Recovery

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“…The potential for water/gas injection is higher in anisotropic reservoirs with shale streaks and low vertical permeability (Hinderaker et al 1992). The present reservoir has non-communicating layers of high permeability contrast.…”

Section: Wag Injectionmentioning

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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“…In the North Sea a certain candidate for WAG injection are Brent reservoirs5. 6. Brent sandstones are heterogeneous stratified formations with shale streaks representing permeability barriers.…”

Section: Introductionmentioning

confidence: 99%

Optimum Water Alternate Gas Injection Schemes for Stratified Reservoirs

Surguchev

Korbøl

Krakstad

1992

SPE Annual Technical Conference and Exhibition

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Water alternate gas (WAG) injection technology is a method which may improve oil recovery efficiency by combining effects from two traditional technologies -water and gas flooding. Both microscopic oil displacement and sweep efficiency can be improved by WAG implementation. This paper describes a method of designing an effective waterlgas flooding in stratified reservoirs.The analytical approach taking into account effects of three phase flow, gravity and viscous forces in anisotropic media, allows the determination of optimum parameters of waterlgas injection. A three-phase extended black oil simulator with relative permeability and capillary pressure hysteresis, was used to validate the optimum WAG injection parameters obtained by the analytical method. In this work, the efficiency of different injection schemes was compared. Simulation results which demonstrate the influence of WAG injection parameters, as water-gas ratio, injection rates and cycle periods, on the recovery process, are discussed.

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IOR resource potential of Norwegian North Sea sandstone reservoirs

Cited by 6 publications

References 2 publications

Simulation Studies of WAG Using Three-Phase Relative Permeability Hysterises Models

Simulation Studies of WAG Using Three-Phase Relative Permeability Hysterises Models

SAGA injection: a new combination IOR process for stratified reservoirs

Optimum Water Alternate Gas Injection Schemes for Stratified Reservoirs

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