A Foam Pilot in a North Sea Oil Reservoir: Preparation for a Production Well Treatment

Aarra, Morten Gunnar; Skauge, Arne

doi:10.2118/28599-ms

Cited by 30 publications

(25 citation statements)

References 6 publications

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“…The rate dependency appear to be stronger at higher foam quality . 4. Foam quality, i n -eifa sat u rations, 30 Bar, amb ient tem p era tu re, So=O, and rese rvoir sores (L :29cm).…”

Section: Methodsmentioning

confidence: 99%

Foams for GOR Control - Improved Stability by Polymer Additives

Aarra¹,

Ormehaug²,

Skauge³

1997

IOR 1997 - 9th European Symposium on Improved Oil Recovery

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Displacement tests in sandstone cores have been applied to quantify formation of foam and the gas blocking ability of water continuous foams witti polymer additives . The different chemical properties of polymers and their interactions witti surfactants made it intergisting to test botte biopolymers and syrithetic polymers . Love mobility foams veere generated botte in Berea and reservoir corgi material witti AOS baserf foams . The formation of foam witti alphaolefinsulfonate surfactant was little influenced by polymer additives as indicated by similar foam propertjes throughout the corgi . The gas blocking ability of the foams was improved witti polymer.

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“…The rate dependency appear to be stronger at higher foam quality . 4. Foam quality, i n -eifa sat u rations, 30 Bar, amb ient tem p era tu re, So=O, and rese rvoir sores (L :29cm).…”

Section: Methodsmentioning

confidence: 99%

Foams for GOR Control - Improved Stability by Polymer Additives

Aarra¹,

Ormehaug²,

Skauge³

1997

IOR 1997 - 9th European Symposium on Improved Oil Recovery

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“…This indicates that pre-generated foam that comes into contact with oil in a porous medium does not necessarily collapse instantaneously, and can travel some distance on the core scale. Aarra and Skauge (1994) and Kristiansen and Holt (1992) conducted similar experiments to these, where they pre-generated AOS-foam with qualities from 65% to 95% outside their core and injected the foam into a core with crude oil at a residual saturation. As we do, they observed decreasing apparent viscosity along the length of the core for foam qualities between 65% and 95% in the presence of oil.…”

Section: Resultsmentioning

confidence: 99%

“…� Co-injection of oil, gas, and surfactant solution into a core (Hussain et al, 2019;Tang et al, 2018). � Injection of pre-generated foam injection into a core pre-saturated with oil (Aarra and Skauge, 1994;Kristiansen and Holt, 1992;Tang, 2019).…”

Section: Introductionmentioning

confidence: 99%

Impact of Crude Oil on Pre-generated Foam in Porous Media

Hussain

Vincent-Bonnieu

Bahrim

et al. 2019

IOR 2019 – 20th European Symposium on Improved Oil Recovery

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As foam is injected into an oil reservoir, the region near an injector can become oil-free due to the relatively high capillary number. Foam created in this region encounters oil further out in the reservoir. The impact of oil on foam in porous media is usually investigated by co-injecting surfactant, gas and oil, or by injecting pre-generated foam into an oil-saturated core. However, the former experiment does not give information on the impact of oil on pre-generated foam, and with the latter experiment one cannot easily obtain data at different oil fractional flows, necessary to model the impact of oil on pre-generated foam. Here we present a novel but relatively simple experimental technique for investigating the effect of oil on pregenerated foam in porous media. This allows one to compare the effects of oil on pre-generated foam and on foam generation without the experimental complications involved in using two separate porous media. We coinject surfactant solution and gas into a relative narrow core (1 cm diameter), and inject oil into the core some distance downstream from the inlet through ports in the side of the core. The relatively narrow core allows rapid contact between the injected crude oil and pre-generated foam in a porous medium much larger than pore dimensions. By injecting the three phases into the core we investigate the flow behaviour of foam with oil at fixed fractional flows of all three phases. We illustrate the technique with a study of the effect of one crude oil with two surfactants. With this system, there is a progressive decrease in the apparent viscosity of the foam after encountering oil. Foams with a higher gas fraction experiences a more-significant weakening by oil over the length of the core than foams with a lower gas fraction. By the end of the core, the apparent viscosities of foam with a higher gas fraction approach values observed with three-phase co-injection. We present a novel, but relatively simple method to investigate the change of foam mobility as it encounters oil in a porous medium, at controlled fractional flows. We show that in our case the apparent viscosity of foam with oil can decrease by more than a factor of four over a distance of 15 cm, indicating that foam and oil reach steady-state (as observed with three-phase co-injection) almost instantaneously compared to the length of a reservoir-simulation grid-block.

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“…14,17,34 The decrease or elimination of foam formation in the presence of oil has been reported by several authors. 28,[34][35][36][37] Mixed Surfactant Systems. In the search to improve foam performance a number of mixed surfactant systems have been tested.…”

Section: Laboratory Testsmentioning

confidence: 99%

Cost Reduction and Injectivity Improvements for CO2 Foams for Mobility Control

Grigg¹,

Tsau²,

Martin³

2002

Proceedings of SPE/DOE Improved Oil Recovery Symposium

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper identifies chemical cost reduction derived from the synergistic effects of co-surfactant systems using a good foaming agent and a less expensive poor foaming agent. The required good foaming agent is reduced by at least 75%. Also the effect on injectivity is reduced by as much as 50% using the co-surfactant system, compared to a previously used surfactant system. Mobility control of injected CO 2 for improved oil recovery can be achieved with significant reduction in the chemical cost of SAG, improved injectivity of SAG, and improved economics of CO 2 injection project when compared to reported systems.

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A Foam Pilot in a North Sea Oil Reservoir: Preparation for a Production Well Treatment

Cited by 30 publications

References 6 publications

Foams for GOR Control - Improved Stability by Polymer Additives

Foams for GOR Control - Improved Stability by Polymer Additives

Impact of Crude Oil on Pre-generated Foam in Porous Media

Cost Reduction and Injectivity Improvements for CO2 Foams for Mobility Control

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