The Influence of Interfacial Tension on Liquid Mobility in Gas Condensate Systems

Ali, J.K.; Butler, Sarah; Allen, Lilas; Wardle, P.

doi:10.2523/26783-ms

Cited by 5 publications

(4 citation statements)

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“…The results in Fig. 7 are consistent with the experimental data by Danesh et al, 10 Chen et al, 5 Ali et al, 11 and Henderson et al 12 These authors observed that S cc increases as increases and the increase in gravity lowers S cc . Various calculations from the model show that, as long as A is not zero ( A Ͼ0), the critical condensate saturation is not affected by the magnitude of A .…”

Section: Effect Of Interfacial Tension and Gravitysupporting

confidence: 89%

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Phenomenological Modeling of Critical Condensate Saturation and Relative Permeabilities in Gas/ Condensate Systems

Firoozabadi

2000

SPE Journal

122

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The effects of gravity, viscous forces, interfacial tension, and wettability on the critical condensate saturation and relative permeability of gas condensate systems are studied using a phenomenological simple network model. The results from the simple model show that wettability significantly affects both critical condensate saturation and relative permeability. Relative permeability at some saturations may increase significantly as the contact angle is altered from 0°͑strongly liquid-wet͒ to 85°͑intermediately gas-wet͒. The results suggest that gas well deliverability in condensate reservoirs can be enhanced by wettability alteration near the wellbore.

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Section: Effect Of Interfacial Tension and Gravitysupporting

confidence: 89%

“…As expected, S cc increases with an increase in . Ali et al 11 observed an improved condensate recovery of 17.2% in a vertical gas injection compared with that in a horizontal injection. Their experiments were conducted with a high interfacial tension for gas condensates (ϭ0.92 dyn/cm).…”

Section: Introductionmentioning

confidence: 99%

Phenomenological Modeling of Critical Condensate Saturation and Relative Permeabilities in Gas/ Condensate Systems

Firoozabadi

2000

SPE Journal

122

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“…Air and n-decane were employed in the liquid imbibitions and for the core displacement tests nitrogen and n-decane were used. Note that the fluids and conditions are maintained the same throughout the experiments, avoiding changes in mobility due to interfacial tension (IFT) (Ali et al 1993). …”

Section: Rock Properties and Fluidsmentioning

confidence: 99%

“…The relative permeability curves are influenced by interfacial tension and by capillary number effects (Ali et al 1993;Fulcher et al 1985). To determine that the change in the relative permeability endpoint is solely caused by the alteration in wettability, the gas and liquid phases are maintained for all of the experiments at the same conditions, making sure that changes in IFT are not influential.…”

Section: Experimental Procedures;mentioning

confidence: 99%

Wettability Alteration at Optimum Fluorinated Polymer Concentration for Improvement in Gas Mobility

Fernández

Fahes

Zoghbi

et al. 2011

SPE EUROPEC/EAGE Annual Conference and Exhibition

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In gas condensate reservoirs, deliverability starts to decrease when retrograde condensation occurs. As the bottom-hole pressure drops below the dew-point, gas condensate and water build-up impede flow of gas to the wellbore. In order to stop the reduction in productivity, many publications suggest wettability alteration to gas-wetting as a permanent solution to the problem. Previous simulation work suggests an "optimum wetting state" to exist where maximum gas condensate well productivity is reached. This work has direct application in gas-condensate reservoirs, especially in identifying the most effective stimulation treatment which can be designed to provide the optimum wetting conditions in the near-wellbore region.In this work, we aim to show the existence of such an optimum state of wettability that result in maximum gas mobility and in an increase of the relative permeability curves. We present an experimental study on Berea sandstone rocks treated with a fluorinated polymer and investigate the optimum fluorinated polymer concentration that would alter the wettability to intermediate gas-wet. Different experimental techniquesincluding flow tests and spontaneous imbibition are conducted to examine the effect of treatments on wettability. Interaction between rocks and the fluids is studied using a MicroCT scanner.The studies in this area are important to improve the productivity of gas condensate reservoirs where liquid accumulates, decreasing production of the well. Efficiency in the extraction of natural gas is important for the economic and environmental considerations of the oil and gas industry. Wettability alteration is one of the newest stimulation methods proposed by researchers, and shows great potential for future field applications and further research studies.

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Application of Horizontal Wells to Reduce Condensate Blockage in Gas Condensate Reservoirs

Miller

Nasrabadi

Zhu

2010

International Oil and Gas Conference and Exhibition in China

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Natural gas is an important source for global energy. It will play a more important role in the future due to increasing energy demands, existing constraints in oil production, and environmental concerns for other fossil fuel types. Much of the current gas reserves can be found in gas-condensate reservoirs. These reservoirs, from a recovery and deliverability standpoint, can have significant differences from oil reservoirs. When the pressure, either in the wellbore or in the reservoir, drops below the dew point pressure, a liquid condensate phase appears and reduces gas production significantly. Several methods have been suggested to handle the condensate blockage problem: hydraulic fracturing, wettability alteration, Huff ‘n’ Puff gas injection, and nonconventional wells. In this work, we study the application of horizontal wells in a giant gas-condensate reservoir (North Field-Qatar) to reduce the condensate blockage. We try to address a critical question of what fraction of increased gas production in a horizontal well is due to increased formation contact and what fraction results from condensate blockage reduction. Horizontal wells have smaller drawdown pressures than vertical wells, which leads to a delay in reaching the dew point pressure compared to vertical wells. Our results indicate that once the dew point pressure is reached and oil saturation is formed in the reservoir, the magnitude of oil saturation buildup in the near wellbore is lower in a horizontal well than a vertical well. The ratio of horizontal well PI to vertical well PI increases after the dew point. The fact that the PI increased after reaching the dew point indicates that this increase in productivity index is directly due to the ability of the horizontal well to reduce condensate blockage in the near wellbore. The PI in the vertical well case is decreasing significantly once the dew point pressure is reached, while the PI in the horizontal well seems to remain steady even after the dew point pressure is reached.

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The Influence of Interfacial Tension on Liquid Mobility in Gas Condensate Systems

Cited by 5 publications

References 0 publications

Phenomenological Modeling of Critical Condensate Saturation and Relative Permeabilities in Gas/ Condensate Systems

Phenomenological Modeling of Critical Condensate Saturation and Relative Permeabilities in Gas/ Condensate Systems

Wettability Alteration at Optimum Fluorinated Polymer Concentration for Improvement in Gas Mobility

Application of Horizontal Wells to Reduce Condensate Blockage in Gas Condensate Reservoirs

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