Effect of wettability on oil and water distribution and production performance in a tight sandstone reservoir

Liu, Guangfeng; Wang, Hengli; Tang, Jiachao; Liu, Zongke; Yang, Daoyong

doi:10.1016/j.fuel.2023.127680

Cited by 8 publications

(8 citation statements)

References 60 publications

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“…46 Moreover, the higher proton signal intensity on the left peak suggests that small pores are more widely distributed. 28,47,48 The pores can generally be divided into three types based on the size of the relaxation time: micropore (relaxation time less than 1 ms), mesopore (relaxation time between 1 and 10 ms), and macropore (relaxation time greater than 10 ms). 49 After the end of the injection stage, the proton signal intensity decreased in the relaxation time range of 2−300 ms due to the discharged crude oil from pores during the injection stage.…”

Section: Huff−puff Imbibition and Static Imbibition Performancementioning

confidence: 99%

Role of Ultralow Interfacial Tension in the Imbibition of Silica Nanofluids

Zhao,

Zhang,

et al. 2023

Energy Fuels

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Nanomaterials have been widely used in oilfields and have attracted more attention. At present, the introduction of nanofluids plays an important role in the imbibition of low-permeability reservoirs. However, the interfacial activity of nanofluids is usually low. There are few studies on the effect of ultralow interfacial tension (IFT) on nanofluid imbibition. In this work, nanofluids with ultralow oil–water IFT of 10–3 mN/m were screened. The core huff–puff imbibition and static imbibition experiments were carried out to study the role of ultralow IFT in imbibition recovery. The experimental results show that ultralow IFT can make the static imbibition of nanofluids reach equilibrium more quickly, but its performance in improving imbibition recovery is limited. The hydrogen nuclear magnetic resonance (HNMR) result illustrates the oil migration process of a huff–puff imbibition. Compared with the injection and production stages, the imbibition in the shut-in stage has a higher contribution to oil recovery. It is found that nanofluids with ultralow IFT have stronger wetting reversal ability at the initial stage by comparing the oil/water/solid three-phase contact angles of different systems. Finally, under the condition that the wetting reversal ability is almost the same, the ultralow IFT reduces the capillary effect and is not conducive to the process of imbibition.

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Section: Huff−puff Imbibition and Static Imbibition Performancementioning

confidence: 99%

Role of Ultralow Interfacial Tension in the Imbibition of Silica Nanofluids

Zhao,

Zhang,

et al. 2023

Energy Fuels

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“…With the rapid development of the world economy, the demand for energy, especially oil, is increasing year by year. , Therefore, it is of great significance to improve the crude oil recovery of the existing oil fields compared with the low probability of discovering a new one . When the reservoir uses its own formation energy for depleted development, it is the primary oil recovery with only about 15% original oil in place (OOIP).…”

Section: Introductionmentioning

confidence: 99%

Effect of the SiO₂ Nanoparticle Size on Application of Enhanced Oil Recovery in Medium-Permeability Formations

Zhou

Jiang

et al. 2023

Energy Fuels

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Nanoparticles (NPs) have been applied in enhanced oil recovery (EOR) successfully over the last couple of decades, due to their unique property inherited by the small size (most of the studies focused on sizes smaller than 50 nm) and abundant surface functional groups. The important mechanism of EOR using a NP-based nanofluid is the change of interfacial properties. However, the effect of the nanoparticle size on the same type of oil recovery has not been systematically studied, especially the larger size. Therefore, in this research, SiO 2 NPs of different sizes, namely, ∼60, ∼100, ∼200, and ∼300 nm, were synthesized using the Stober method and the properties of the NP-based nanofluids were investigated, including interfacial tension (IFT), contact angle, viscosity, capillary pressure, and the ability to extract oil. The experimental results showed that as the SiO 2 NP size decreased, there was a little increase in the IFT, oil contact angle, viscosity, and capillary pressure. With a NP concentration of 0.3 wt % in 3 wt % NaCl brine, the ∼60 nm SiO 2 NP-based nanofluid was the most efficient oil-displacing agent to recover oil from the mediumpermeability core sample of Daqing Oilfield. Therefore, according to the discussion of the selective preference for SiO 2 NP sizes, the developed nanofluid is a promising new material in medium-permeability reservoirs for enhanced oil recovery.

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“…26 In addition, it influences the reservoir fluid's relative permeability and governs the microscale dispersion of initial and residual oil and water in pore spaces of the reservoir rocks. 23,27 Thus, its knowledge is vital for hydrocarbon recovery efficiency and optimization and for the assessment of the CO 2 storage potential in the Bentheimer and Bandera Gray formations. 23 Thus, this study is focused on assessing the effects of rock firing on the wettability of clay-rich sandstone.…”

Section: Introductionmentioning

confidence: 99%

“…23,27 Thus, its knowledge is vital for hydrocarbon recovery efficiency and optimization and for the assessment of the CO 2 storage potential in the Bentheimer and Bandera Gray formations. 23 Thus, this study is focused on assessing the effects of rock firing on the wettability of clay-rich sandstone. The BG sandstone samples were chosen due to their high clay compositions.…”

Section: Introductionmentioning

confidence: 99%

“…Wettability is a crucial parameter that governs fluid flow and distribution in reservoir rocks. − Wettability has a principal effect on fluid distribution in rock pores and capillarity . In addition, it influences the reservoir fluid’s relative permeability and governs the microscale dispersion of initial and residual oil and water in pore spaces of the reservoir rocks. , Thus, its knowledge is vital for hydrocarbon recovery efficiency and optimization and for the assessment of the CO 2 storage potential in the Bentheimer and Bandera Gray formations …”

Section: Introductionmentioning

confidence: 99%

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Influence of Rock Firing on the Wettability of Clay-Rich Sandstones

et al. 2023

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Rock firing is a conventional technique of core preparation to prevent clay swelling and fines migration in clay-rich rock; however, the influence of rock firing on the wetting behaviors and alterations of mineralogical compositions of clay-rich sandstones is not yet explicit. Thus, we assessed and compared the impacts of rock burning at two different temperatures (700 and 1100 °C) on the changes in wetting states of Bentheimer (BN) and clay-rich Bandera Gray (BG) sandstones through contact angle measurement, Amott wettability index determination, and thermogravimetric analysis (TGA). Results showed that rock firing makes the rocks more water-wet, but the clay-rich BG sandstone becomes significantly more water-wet than the quartz-dominated BN rock with increasing temperature. There was no change in rock porosity due to firing, but some clay remained, whereas some clays were transformed into other minerals after rock firing. Particularly, there were thermal transformations of clay to quartz and the disappearance of dolomite, chlorite, and clinochlore. Such transformation of these minerals into alkali metal oxide silicates dispersed on the rock matrix makes the surface more polar and enhances the interactions with water molecules, resulting in more water wettability for the BG sandstone. The study suggests that rock firing could change the clay-rich rock-wetting state into a more water-wet condition than the clay-poor or zero-clay sandstone samples; thus, the influence of rock burning on rock-wetting behavior should be considered to ensure an accurate prediction of the rock-wetting state due to rock burning. Moreover, burning at 1100 °C is recommended to achieve effective clay transformation and removal in clay-rich rock to prevent swelling, fines migration, and clay–fluid interactions.

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Effect of wettability on oil and water distribution and production performance in a tight sandstone reservoir

Cited by 8 publications

References 60 publications

Role of Ultralow Interfacial Tension in the Imbibition of Silica Nanofluids

Role of Ultralow Interfacial Tension in the Imbibition of Silica Nanofluids

Effect of the SiO₂ Nanoparticle Size on Application of Enhanced Oil Recovery in Medium-Permeability Formations

Influence of Rock Firing on the Wettability of Clay-Rich Sandstones

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Effect of wettability on oil and water distribution and production performance in a tight sandstone reservoir

Cited by 8 publications

References 60 publications

Role of Ultralow Interfacial Tension in the Imbibition of Silica Nanofluids

Role of Ultralow Interfacial Tension in the Imbibition of Silica Nanofluids

Effect of the SiO2 Nanoparticle Size on Application of Enhanced Oil Recovery in Medium-Permeability Formations

Influence of Rock Firing on the Wettability of Clay-Rich Sandstones

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Effect of the SiO₂ Nanoparticle Size on Application of Enhanced Oil Recovery in Medium-Permeability Formations