Molecular Morphology and Viscoelasticity of ASP Solution under the Action of a Different Medium Injection Tool

Huang, Bin; Hu, Xinyu; Fu, Cheng; Wang, Xin; Wang, Li

doi:10.3390/polym11081299

Cited by 9 publications

(6 citation statements)

References 65 publications

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“…Biopolymers exhibit only shear-thinning response due to a rod-like molecular structure; however, hydrolyzed polyacrylamide can exhibit both responses depending on the molecular weight and salinity of the brine. Note that the shear-thickening response is commonly associated with viscoelasticity, which describes fluids (e.g., polymer diluted solutions) that exhibit elongational or extensional behavior under flow in porous media [7,13,14]. Most polymers with high molecular weight used for EOR have been reported to have good viscoelastic response, with debatable acceptance [7,13,[15][16][17].…”

Section: Polymer Rheologymentioning

confidence: 99%

An Elongational and Shear Evaluation of Polymer Viscoelasticity during Flow in Porous Media

2020

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This paper uses a combination of approaches to evaluate the viscoelastic phenomenon in high-molecular-weight polymers (24–28 M Daltons) used for enhanced oil recovery (EOR) applications. Rheological data were cross-analyzed with single- and two-phase polymer flooding experiments in outcrop cores and micromodels, respectively. First, the impact of semi-harsh conditions (salinity, hardness, and temperature) was evaluated. Second, the impact of polymer degradation (sand face flow), focusing on the viscoelastic properties, was investigated. Finally, polymer viscoelastic properties were characterized, proposing a threefold rheological approach of rotational, oscillatory, and elongational behavior. Data from the rheological approaches were cross-analyzed with core flooding experiments and performed at a room temperature of 22 °C and at a higher temperature of 55 °C. The change in polymer viscoelastic properties were analyzed by investigating the effluents from core flooding experiments. Oil recovery experiments in micromodel helped our understanding of whether salinity or hardness has a dominating impact on in situ viscoelastic polymer response. These approaches were used to study the impact of mechanical degradation on polymer viscoelasticity. The brines showed notable loss in polymer viscoelastic properties, specifically with the hard brine and at higher temperature. However, the same polymer solution diluted in deionized water exhibited stronger viscoelastic properties. Multiple flow-behaviors, such as Newtonian, shear thinning, and thickening dominated flow, were confirmed through pressure drop analysis against interstitial velocity as already reported by other peer researchers. Turbulence-dominated excessive pressure drop in porous media was calculated by comparing core flood pressure drop data against pressure data in extensional viscometer–rheometer on a chip (eVROC®). In addition, a significant reduction in elastic-dominated flow was confirmed through the mechanical degradation that happened during core flood experiments, using various approaches. Finally, reservoir harsh conditions (high temperature, hardness, and salinity) resulted in a significant reduction in polymer viscoelastic behavior for all approaches.

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Section: Polymer Rheologymentioning

confidence: 99%

An Elongational and Shear Evaluation of Polymer Viscoelasticity during Flow in Porous Media

2020

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“…The resistance coefficient also increases with the concentration of ASP solution injected into cores 1 and 2. This is because with the concentration of ASP solution injected increasing, the aggregation volume of polymer molecules in pores increases, and the shear stress of the solution during core pore flow increases, 56 so the resistance coefficient also increases with the concentration of solution.…”

Section: Resultsmentioning

confidence: 99%

Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach

Huang

et al. 2020

Energy Science & Engineering

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To improve the oil displacement effect of ASP (alkali/surfactant/polymer) solution in heterogeneous oil reservoirs, layered injection technology is proposed for the first time for Daqing Oilfield. The technology uses partial pressure tools to control the injection amount of ASP solution in high‐permeability oil layers and uses a partial quality tool in low‐permeability oil layers. To study the experimental effect of this layered injection technology, the relationships between the different permeability, molecular weight, and concentration of the ASP solution, as well as the resistance coefficient and residual resistance coefficient, are first established, and then, a layered injection experimental model is established to carry out experimental research on injection capacity and oil displacement capacity. The experimental results show that the smaller the range of the core permeability is, the larger the molecular weight and concentration of the ASP solution are, and the poorer the injection capacity of the ASP solution is. After the action of a partial pressure tool and a partial quality tool, the injection capacity of ASP solution is improved to different degrees, and the oil displacement effect of low‐permeability cores is significantly improved, while the total oil recovery is increased, and the total oil recovery of heterogeneous cores under different conditions is increased by 1.4%‐4.05%. This experiment is of great significance to the study of improving the oil recovery of heterogeneous reservoirs.

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“…4πε 0 ε r r ij (4) where q i and q j are the charges; ε 0 and ε r are the permittivity of the vacuum and the relative dielectric constant, respectively; and ε r is 15 [45].…”

Section: Bonded Interaction and Nonbonded Interactionmentioning

confidence: 99%

“…Polymers and surfactants are essential additives that have been frequently used in petroleum engineering [1][2][3][4], process intensification [5], mass transportation [6], sewage systems [7], drag delivery [8,9], etc. Within a polymer/surfactant mixture, macromolecule chains and surfactant micelles can chemically/physically interact to generate unique structures/phases such as swollen cages, bottlebrushes, etc.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Interaction Enhanced Rheological Behavior in PAM/CTAC/Salt Aqueous Solution—A Coarse-Grained Molecular Dynamics Study

Liu

et al. 2020

Polymers

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Interfacial interactions within a multi-phase polymer solution play critical roles in processing control and mass transportation in chemical engineering. However, the understandings of these roles remain unexplored due to the complexity of the system. In this study, we used an efficient analytical method—a nonequilibrium molecular dynamics (NEMD) simulation—to unveil the molecular interactions and rheology of a multiphase solution containing cetyltrimethyl ammonium chloride (CTAC), polyacrylamide (PAM), and sodium salicylate (NaSal). The associated macroscopic rheological characteristics and shear viscosity of the polymer/surfactant solution were investigated, where the computational results agreed well with the experimental data. The relation between the characteristic time and shear rate was consistent with the power law. By simulating the shear viscosity of the polymer/surfactant solution, we found that the phase transition of micelles within the mixture led to a non-monotonic increase in the viscosity of the mixed solution with the increase in concentration of CTAC or PAM. We expect this optimized molecular dynamic approach to advance the current understanding on chemical–physical interactions within polymer/surfactant mixtures at the molecular level and enable emerging engineering solutions.

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Molecular Morphology and Viscoelasticity of ASP Solution under the Action of a Different Medium Injection Tool

Cited by 9 publications

References 65 publications

An Elongational and Shear Evaluation of Polymer Viscoelasticity during Flow in Porous Media

An Elongational and Shear Evaluation of Polymer Viscoelasticity during Flow in Porous Media

Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach

Interfacial Interaction Enhanced Rheological Behavior in PAM/CTAC/Salt Aqueous Solution—A Coarse-Grained Molecular Dynamics Study

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