Impacts of polymer properties on field indicators of reservoir development projects

Lamas, L. F.; Schiozer, Denis José; Delshad, Mojdeh

doi:10.1016/j.petrol.2016.05.020

Cited by 19 publications

(6 citation statements)

References 8 publications

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“…The viscosity of the polymer at 120 days was about three-fifths or 60% of the virgin polymer solution during polymer static degradation, and the viscosity of the polymer at 120 days was approximately half that of the virgin polymer solution during polymer dynamic degradation. The main reason for this finding is that the long molecular polymer chains break down in the process of polymer degradation, and the length of average molecular chains is cut along with the average molecular weight of polymer, which leads to a decrease in the viscosity of the polymer solution [19,49]. Combining the polymer viscometric experiment and the polymer degradation experiment results, the first-order static and dynamic degradation rate constants can be calculated.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Polymer Degradation on Polymer Flooding in Heterogeneous Reservoirs

Xin

Chen

et al. 2018

Polymers

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Polymer degradation is critical for polymer flooding because it can significantly influence the viscosity of a polymer solution, which is a dominant property for polymer enhanced oil recovery (EOR). In this work, physical experiments and numerical simulations were both used to study partially hydrolyzed polyacrylamide (HPAM) degradation and its effect on polymer flooding in heterogeneous reservoirs. First, physical experiments were conducted to determine basic physicochemical properties of the polymer, including viscosity and degradation. Notably, a novel polymer dynamic degradation experiment was recommended in the evaluation process. Then, a new mathematical model was proposed and an in-house three-dimensional (3D) two-phase polymer flooding simulator was designed to examine both polymer static and dynamic degradation. The designed simulator was validated by comparison with the simulation results obtained from commercial software and the results from the polymer flooding experiments. This simulator further investigated and validated polymer degradation and its effect. The results of the physical experiments showed that the viscosity of a polymer solution increases with an increase in polymer concentration, demonstrating their underlying power law relationship. Moreover, the viscosity of a polymer solution with the same polymer concentration decreases with an increase in the shear rate, demonstrating shear thinning. Furthermore, the viscosity of a polymer solution decreased with an increase in time due to polymer degradation, exhibiting an exponential relationship. The first-order dynamic degradation rate constant of 0.0022 day−1 was greater than the first-order static degradation rate constant of 0.0017 day−1. According to the simulation results for the designed simulator, a 7.7% decrease in oil recovery, after a cumulative injection volume of 1.67 pore volume (PV) was observed between the first-order dynamic degradation rate constants of 0 and 0.1 day−1, which indicates that polymer degradation has a detrimental effect on polymer flooding efficiency.

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Section: Resultsmentioning

confidence: 99%

“…(5) Degradation. Polymer degradation includes thermal, chemical, mechanical, and biological degradation [19,20], and its magnitude depends on temperature, oxygen content, a shear rate, and other factors [21,22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polymer Degradation on Polymer Flooding in Heterogeneous Reservoirs

Xin

Chen

et al. 2018

Polymers

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“…43,44 (5) Degradation. Polymer degradation includes thermal, chemical, mechanical, and biological degradation, 14,45 and it's mainly influenced by factors such as formation temperature, shear rate, and oxygen content. 46 Degradation of polymers is crucial for polymer flooding to improve crude oil recovery, because polymer degradation decreases polymer solution viscosity and leads to an increase in water-oil viscosity ratio, thus seriously impacting polymer flooding effectiveness.…”

Section: Introductionmentioning

confidence: 99%

“…(5) Degradation. Polymer degradation includes thermal, chemical, mechanical, and biological degradation, 14,45 and it's mainly influenced by factors such as formation temperature, shear rate, and oxygen content 46 …”

Section: Introductionmentioning

confidence: 99%

Simulated evaluation of the degradation of hydrophobically associative polymers in the formation

Qi,

Shu,

Luo

2023

J of Applied Polymer Sci

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In this work, indoor physical simulation experiments were used to examine the effects of shear, thermal, chemical, and microbial degradation on the properties of the hydrophobic associative polymer AP‐P4. It was discovered that the viscosity of the polymer solution generally decreased as the shear time was extended. The larger the shear strength, the lower the solution viscosity. Fitting of the nonlinear equation of solution viscosity with shear time, η = 12,988 t−1.08. When thermal degradation started, the solution viscosity first started to rise, however, this phase was just a short one. The viscosity of the solution gradually started to decrease as the thermal degradation period grew. In addition, the trends of properties like hydrokinetic radius, hydrophobic connectivity, and hydrolysis essentially followed the same patterns as those of solution viscosity. At the beginning of the degradation process, the viscosity retention of the polymer solution without oxygen is significantly higher than that of the aerobic environment. However, the difference between the two becomes smaller as the degradation time increases. In addition, the AP‐P4 had good temperature resistance and aging resistance capabilities when iron ions were present. Finally, it was discovered that AP‐P4 had a strong antibacterial effect, which decreased the viscosity brought on by microbial action.

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“…In contrast to near wellbore treatment applications, polymer gels are applied in injector wells through in-depth fluid diversion (IFD) to increase reservoir scale sweep efficiency. Novel gel systems allow multichoice range solutions from weak gels to sequential injection for in situ gels, colloidal dispersion gels, preformed gels, and microgels (Darmayanti et al, 2016;Lamas de Oliveira et al, 2016;Zhang et al, 2016). The objective of an IFD process is to modify reservoir inflow profile for significant reduction of thief zones effective permeability to prevent the water uptake.…”

Section: Introductionmentioning

confidence: 99%

Novel polymeric nanogel as diversion agent for enhanced oil recovery

Suleimanov

Veliyev

2017

Petroleum Science and Technology

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The authors discuss the nanogel application as deep diversion agent for enhanced oil recovery (EOR). Experimental studies of nanogel show that its utilization allows combining the advantages of gels used in bulk and sequential injection. Addition of light metal nanoparticles subsequently increases the gel system strength while crosslinking, however it has no impact on flow ability of polymer solution. The nanogels application as deep diversion agent for EOR was studied in treatment experiments at two crossflow layered artificial cores. Nanoparticle addition increases residual resistance factor of polymer gel up to 22% and show a more long-lasting effect. Oil recovery increase for nanogel application was 6% original oil in place (OOIP) in comparison with gel without nanoparticles. It has been shown the gel bank's position impact on oil recovery efficiency at in situ fluid diversion operations. The series of experiments for both types of gels with three different gel blank positions were conducted. Experimental results showed the best value of 19% and 28% OOIP recovery increase in near production line position for gel and nanogels, respectively.

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Impacts of polymer properties on field indicators of reservoir development projects

Cited by 19 publications

References 8 publications

Effect of Polymer Degradation on Polymer Flooding in Heterogeneous Reservoirs

Effect of Polymer Degradation on Polymer Flooding in Heterogeneous Reservoirs

Simulated evaluation of the degradation of hydrophobically associative polymers in the formation

Novel polymeric nanogel as diversion agent for enhanced oil recovery

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