Effect of polymer molar mass and montmorillonite content on polymer flooding using a glass micromodel

Rahimi, Sadegh; Habibian, Mahmoud; Salehi, Mahsa Baghban

doi:10.1016/j.clay.2018.07.029

Cited by 17 publications

(18 citation statements)

References 29 publications

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“…The annual polymer flooding oil production accounts for more than 30% of the total oil production. Polymer flooding has great potential for increasing oil production [ 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Polymer Viscoelasticity on Microscopic Remaining Oil Production

et al. 2022

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To investigate the impact of polymer viscoelasticity on microscopic remaining oil production, this study used microscopic oil displacement visualisation technology, numerical simulations in PolyFlow software, and core seepage experiments to study the viscoelasticity of polymers and their elastic effects in porous media. We analysed the forces affecting the microscopic remaining oil in different directions, and the influence of polymer viscoelasticity on the displacement efficiency of microscopic remaining oil. The results demonstrated that the greater the viscosity of the polymer, the greater the deformation and the higher the elasticity proportion. In addition, during the creep recovery experiment at low speed, the polymer solution was mainly viscous, while at high speed it was mainly elastic. When the polymer viscosity reached 125 mPa·s, the core effective permeability reached 100 × 10−3 μm2, and the equivalent shear rate exceeded 1000 s−1, the polymer exhibited an elastic effect in the porous medium and the viscosity curve displayed an ‘upward’ phenomenon. Moreover, the difference in the normal deviatoric stress and horizontal stress acting on the microscopic remaining oil increased exponentially as the viscosity of the polymer increased. The greater the viscosity of the polymer, the greater the remaining oil deformation. During the microscopic visualisation flooding experiment, the viscosity of the polymer, the scope of the mainstream line, and the recovery factor all increased. The scope of spread in the shunt line area significantly increased, but the recovery factor was significantly lower than that in the mainstream line. The amount of remaining oil in the unaffected microscopic area also decreased.

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Section: Introductionmentioning

confidence: 99%

Influence of Polymer Viscoelasticity on Microscopic Remaining Oil Production

et al. 2022

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“…To study the influence of the viscosity change of the displacement phase on the initial migration of the remaining oil in the corner, numerical simulations under different viscosity conditions were performed [ 40 , 41 , 42 ]. By using outputting parameters such as oil saturation, velocity, and pressure in the corner during the displacement process of the same injection volume (0.2 PV), the production mechanism of the remaining oil in the corner was analyzed ( Figure 9 ).…”

Section: Resultsmentioning

confidence: 99%

Study on Micro Production Mechanism of Corner Residual Oil after Polymer Flooding

et al. 2022

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To study the microscopic production mechanism of corner residual oil after polymer flooding, microscopic visualization oil displacement technology and COMSOL finite element numerical simulation methods were used. The influence of the viscosity and interfacial tension of the oil displacement system after polymer flooding on the movement mechanism of the corner residual oil was studied. The results show that by increasing the viscosity of the polymer, a portion of the microscopic remaining oil in the corner of the oil-wet property can be moved whereas that in the corner of the water-wet property cannot be moved at all. To move the microscopic remaining oil in the corners with water-wet properties after polymer flooding, the viscosity of the displacement fluid or the displacement speed must be increased by 100–1000 times. Decreasing the interfacial tension of the oil displacement system changed the wettability of the corner residual oil, thus increasing the wetting angle. When the interfacial tension level reached 10−2 mN/m, the degree of movement of the remaining oil in the corner reached a maximum. If the interfacial tension is reduced, the degree of production of the residual oil in the corner does not change significantly. The microscopic production mechanism of the corner residual oil after polymer flooding expands the scope of the displacement streamlines in the corner.

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“…So, compared with ADOS, ADOS/OMMT had better elastic properties. These results could be interpreted as, the original intermolecular hydrophobic association was strengthened by electrostatic interaction and hydrogen bonding between molecular chains of matrix and exfoliated MMT layers, forming a more complex and stable physical network structure [60].…”

Section: Viscoelastic Behaviourmentioning

confidence: 91%

Preparation and properties of amphiphilic hydrophobically associative polymer/ montmorillonite nanocomposites

Bai

Yue

et al. 2020

R. Soc. open sci.

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In this research, a novel amphiphilic hydrophobically associative polymer nanocomposite (ADOS/OMMT) was prepared using acrylamide (AM), sodium 4-vinylbenzenesulfonate (SSS), N, N′-dimethyl octadeyl allyl ammonium bromide (DOAAB) and organo-modified montmorillonite (OMMT) through in situ polymerization. Both X-ray diffraction patterns and transmission electron microscopy images verified the dispersion morphology of OMMT in the copolymer matrix. Then, the effect of the introduction of OMMT layers on the copolymer properties was studied by comparing with pure copolymer AM/SSS/DOAAB (ADOS). The thermal degradation results demonstrated that the thermal stability of the ADOS/OMMT were better than pure copolymer ADOS. During the solution properties tests, ADOS/OMMT nanocomposite was superior to ADOS in viscosifying ability, temperature resistance, salt tolerance, shear resistance and viscoelasticity, which was because OMMT contributed to enhance the hydrophobic association structure formed between polymer molecules. Additionally, the ADOS/OMMT nanocomposite exhibited more excellent interfacial activity and crude oil emulsifiability in comparison to pure copolymer ADOS. These performances indicated ADOS/OMMT nanocomposite had good application prospects in tertiary recovery.

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Effect of polymer molar mass and montmorillonite content on polymer flooding using a glass micromodel

Cited by 17 publications

References 29 publications

Influence of Polymer Viscoelasticity on Microscopic Remaining Oil Production

Influence of Polymer Viscoelasticity on Microscopic Remaining Oil Production

Study on Micro Production Mechanism of Corner Residual Oil after Polymer Flooding

Preparation and properties of amphiphilic hydrophobically associative polymer/ montmorillonite nanocomposites

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