Experimental investigation on the effect of wettability on rock-electricity response in sandstone reservoirs

Han, Yujiao; Zhou, Cancan; Yu, Jun; Li, Chaoliu; Hu, Fengxia; Xu, Huaimin; Yuan, Chao

doi:10.1016/j.fuel.2018.11.072

Cited by 30 publications

(8 citation statements)

References 21 publications

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“…However, a common practice is to take n ≈ 2 for laboratory and field investigations when the measured values are not available (Breen et al ., 2012). The problem is that this exponent can vary with petrophysical properties of the target, such as rock and soil properties, hysteresis and pore water chemistry (Sondenâ et al ., 1990; Maineult et al ., 2018; Han et al ., 2019). For instance, Han et al .…”

Section: Introductionmentioning

confidence: 99%

“…However, a common practice is to take n ≈ 2 for laboratory and field investigations when the measured values are not available (Breen et al, 2012). The problem is that this exponent can vary with petrophysical properties of the target, such as rock and soil properties, hysteresis and pore water chemistry (Sondenâ et al, 1990;Maineult et al, 2018;Han et al, 2019). For instance, Han et al (2007) measured the resistivity index of 10 carbonate rocks with different structures and found that n was around 1.6 for carbonates with single porosity and n varied a lot for carbonate rocks with double porosity.…”

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confidence: 99%

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Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Deng

Qian

Luo

et al. 2022

Near Surface Geophysics

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Researchers around the world have carried out numerous studies on the electrical response of oil‐contaminated silica sands. However, few studies consider the oil contamination in carbonate sands that exhibit quite different characteristics to silica sands. The purpose of this work is to study the influence of grain size (0.5–1.0, 1–3 and 3–5 mm), solution salinity (100, 10 and 1 Ω·m) and pH (4.58, 6.5 and 9.25) on the resistivity and saturation exponent of oil‐bearing carbonate sands. Experimental columns were packed with crushed limestone grains, solution and oil. Electrical resistivity measurements were subsequently performed on the packed columns. Grain size exhibits a complex effect on the electrical response of partially saturated limestone grains. Resistivity decreases slightly with increasing grain size when water saturation is greater than 0.4, while it shows an inconsistent trend when water saturation is lower than 0.4. The resulting saturation exponent n decreases slightly when grain size increases from 0.5–1 mm to 1–3 mm, while it shows a positive change in n values for grain size of 3–5 mm. Changes in solution salinity significantly influence the resistivity and saturation exponent of limestone grains, with higher solution salinity resulting in lower resistivity and higher saturation exponent. However, with solution pH increasing from 4.58 to 9.25, it shows very limited effect on the resistivity and saturation exponent of limestone grains. This can be attributed to the strong buffering ability of limestone. Effects of grain size, solution salinity and pH on the resistivity and saturation exponent of oil‐bearing carbonate sands were investigated. Resistivity is found to show a decreasing trend with increasing grain size from 0.5–1 mm to 3–5 mm above a certain saturation (e.g. Sw > 0.4), while it shows a rapid increase below a certain saturation (e.g., Sw≤$ \le $0.4) for a larger grain size of 3–5 mm. Resistivity decreases and the saturation exponent increases with the increase of solution salinity for oil‐bearing carbonate sands. Resistivity and saturation exponent do not vary significantly with solution pH ranging from 4.58 to 9.25 for oil‐bearing carbonate sands.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Deng

Qian

Luo

et al. 2022

Near Surface Geophysics

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show abstract

“…The two main parameters that have a straight influence on EOR processes are capillary number and mobility ratio and in EOR sector be attempted to improve oil production by changing these two factors. Altering wettability might have a major effect on the capillary force, relative permeability, flooding behavior, residual oil saturation, etc [25][26][27][28][29][30]. Thus, one of the vital matters that cannot be overlooked is still wettability.…”

Section: Introductionmentioning

confidence: 99%

Amphoteric and cationic surfactants for enhancing oil recovery from carbonate oil reservoirs

Esfandyari

Rahimi

Esmaeilzadeh

et al. 2021

Journal of Molecular Liquids

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“…Credible evaluation of wettability in reservoirs is vitally essential because it has a great impact on the displacement of hydrocarbons through the porous medium (Amott 1959;Anderson 1985;A. Davarpanah and Mirshekari 2020;Han et al 2019;Hirasaki and Zhang 2004;Y. Hu et al 2020;Jadhunandan and Morrow 1995;Jarrahian et al 2012;Newgord et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Hu et al 2020;Jadhunandan and Morrow 1995;Jarrahian et al 2012;Newgord et al 2020). Moreover, the variation of wettability have a huge impact on the capillary pressure, irreducible water saturation and residual oil saturation (Anderson 1985;A Davarpanah 2018;A Davarpanah and Mirshekari 2019a, 2019b, 2019cHan et al 2019;Xiao Hu et al 2020;Jadhunandan and Morrow 1995). It has been proved that the most of the carbonate reservoirs act as oil-wet due to the interaction of components crude oil and the kind of this rock (Afshin Davarpanah 2020; Afshin Davarpanah et al 2018;Geyssant 2019;Hirasaki and Zhang 2004;Xiaoyong Hu et al 2020;Jarrahian et al 2012;Kafashi et al 2020;Zhou and Davarpanah 2020).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous evaluation of capillary pressure and wettability alteration based on the USBM and imbibition tests on carbonate minerals

Esfandyari

Hoseini

Shadizadeh

et al. 2021

Journal of Petroleum Science and Engineering

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Experimental investigation on the effect of wettability on rock-electricity response in sandstone reservoirs

Cited by 30 publications

References 21 publications

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Amphoteric and cationic surfactants for enhancing oil recovery from carbonate oil reservoirs

Simultaneous evaluation of capillary pressure and wettability alteration based on the USBM and imbibition tests on carbonate minerals

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