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

Fernández, R. Rodríguez; Fahes, Mashhad; Zoghbi, Bilal; Ali, Nour Samih El Cheikh

doi:10.2118/143040-ms

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…The Vuelta field uses horizontal wells to improve the production and drainage efficiency, but the well performance was less than what was expected because of the abnormal stratigraphic characteristics of the producing formation. Fevang and Whitson (1996) found that simulation results of horizontal wells in condensate reservoirs are very sensitive to the horizontal-/vertical-permeability ratio (k H / k V ), and so it is very important to have an accurate determination of this ratio. Muladi and Pinczewski (1999) examined the difference in production performance between horizontal and vertical wells for different heterogeneities in gas/condensate reservoirs.…”

Section: Drilling Horizontal Wellsmentioning

confidence: 99%

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Mitigation of the Effects of Condensate Banking: A Critical Review

Sayed

Al-Muntasheri

2016

SPE Production &Amp; Operations

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With production from gas/condensate reservoirs, the flowing bottomhole pressure of the production well decreases. When the flowing bottomhole pressure decreases below the dewpoint, condensate accumulates near the wellbore region and forms a condensate bank. This results in a loss of productivity of both gas and condensate, which becomes more serious in intermediate-and low-permeability gas/condensate reservoirs, where the condensate bank reduces both the gas permeability and the well productivity.Several techniques have been used to mitigate this problem. These methods include:• Use of solvents and wettability-alteration chemicals to reduce the impact of condensate blockage • Gas cycling and injection of nitrogen and supercritical carbon dioxide as pressure-maintenance methods • Drilling horizontal wells, hydraulic fracturing, and acidizing to improve the well productivity Gas cycling aims to keep the reservoir pressure greater than the dewpoint pressure to reduce the condensation phenomena. The limited volumes of gas that can be recycled in the reservoir can hinder the application of this method. For an ideal gas-cycling process, the volume of the gas injected into the reservoir will be larger than the total gas that can be produced from such a reservoir. Other approaches are the drilling of horizontal wells and hydraulic fracturing, during which the pressure drop around the wellbore region is lowered to allow for a longer production time, with only single-phase gas flow to the wellbore. These approaches are costly because they require drilling rigs. Another technique is the use of solvents, which shows good treatment outcomes, but the durability is a questionable issue in these treatments. Moreover, wettability alteration needs to be approached very carefully so as not to cause permanent damage to the reservoir. The use of fluorinated polymers and surfactants dissolved in alcohol-based solvents for wettability-alteration treatments was reported in many studies.Each method has its own advantages and disadvantages, and can be applied under certain conditions. This paper presents all of these methods, along with their advantages and disadvantages and description of some of their field applications and case studies.

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Section: Drilling Horizontal Wellsmentioning

confidence: 99%

“…4. Immediately beside the wellbore, where the high gas velocity leads to decreased condensate saturation and increased gas mobility through velocity stripping (Fevang and Whitson 1996;Kalaydjian et al 1996;Ali et al 1997;Henderson et al 1998). Fig.…”

Section: Introductionmentioning

confidence: 99%