Seepage flow characteristics and ability for enhanced oil recovery based on ultra high molecular weight partially hydrolysed polyacrylamide

Zhang, Peng; Wang, Yefei; Guo, Shufeng; Pan, Binlin; Wen-zhang, Huang; Jia, Zhenfu; Zhou, Chengyu; Guo, Maolei; Yu, Haiyang

doi:10.1504/ijogct.2017.082045

Cited by 6 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And given the linear structure of the polymer, the hydrodynamic size of the polymer will significantly reduce after passing through shearing action, and the apparent viscosity loss will be more significant. Researchers have explored new polymers represented by ultrahigh molecular weight polymers [12][13] and hydrophobic association polymers, [14][15] but they have poor injection performance in low and medium permeability reservoirs. Moreover, the solubility of hydrophobic associating polymer becomes worse under high salt condition because of strong hydrophobic associating.…”

Section: Introductionmentioning

confidence: 99%

Mobility control capability of a modified chitosan hyperbranched polymer in porous media

Chen

Wang

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

The residual resistance factor (RRF) is an important parameter expressing the mobility control capability of the polymer, and it is related to the polymer molecular structure. This study investigated the ability of three polymers with different molecular structures to establish RRF in a one‐dimensional sand pack model at different permeabilities. In addition, the static adsorption capacity of the three polymers on the rock surface was investigated, and the mechanism of the polymer retention in porous media was explored by changing the wettability of the rock surface. Furthermore, the microscopic morphological changes of the polymers before and after passing through the porous media were observed by environmental scanning electron microscopy. Finally, nuclear magnetic resonance core flooding experiments were used to investigate the oil displacement characteristics of the three polymers in the core. T Results show that the ability of the three polymers to establish RRF gradually decreases with the increase in permeability. Still, the modified chitosan hyperbranched polymer (HPDACS) has the best ability to establish RRF in porous media with the largest static adsorption equilibrium amount of 1249 μg/g. Mechanical capture is the dominant mechanism for HPDACS to establish retention in porous media. In addition, HPDACS has a better ability to enhance recovery. It can improve oil recovery by 20.43%, which is higher than that by dendritic polymer HPDA at 16.34% and partially hydrolyzed polyacrylamide at 10.07%. HPDACS can establish a larger resistance in the macropores of the core. Thus, the remaining oil is better driven in the medium and small pores. This finding indicates that HPDACS has excellent potential for oil displacement.

show abstract

Section: Introductionmentioning

confidence: 99%

Mobility control capability of a modified chitosan hyperbranched polymer in porous media

Chen

Wang

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Partially hydrolyzed polyacrylamide (HPAM) solution with high viscosity and high molecular weight has been widely used in tertiary oil recovery [1]. During the preparation process, viscous polymer mother liquids have to be mixed with water using static mixers [2].…”

Section: Introductionmentioning

confidence: 99%

Shearing and Mixing Performance of Ultrahigh-Molecular-Weight Hydrolyzed Polyacrylamide (HPAM) Solution in a Helixes Static Mixer

Sun

Wang

Ju³

et al. 2021

Teh. vjesn.

View full text Add to dashboard Cite

Static mixers have been widely used to dilute high viscosity, high-molecular-weight polymer mother liquor for polymer flooding, in which the mixing performance plays a critical role. In this work, a novel mixing configuration, named as Helixes static mixer, was proposed to reduce high viscosity degradation rate of polyacrylamide solution resulting from mechanical shear during mixing process. Computational fluid dynamics simulations along with experiments were performed to investigate the mixing process. Several criteria such as the intensity of segregation, mixing distance, pressure loss, and shear strain rate were used to evaluate the mixing and shear performance of static mixers. Compared to the SMX and Kenics static mixer, a longer mixing distance is needed for the Helixes static mixer to achieve an ideal mixture. A lower shear strain rate along with less viscosity degradation rate is obtained in flow field of Helixes static mixer. The spiral-lead and helical directions of mixing elements were optimized to improve mixing performance. Experimental results are in good agreement with the numerical simulations on the intensity of segregation. The viscosity degradation rate of HPAM solution which flows through Helixes static mixer is lower than that of SMX and Kenics static mixers.

show abstract

Study on the biodegradability of a chitosan‐modified hyperbranched polymer for enhanced oil recovery

Chen

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

This study introduced a chitosan‐modified hyperbranched polymer (HPDACS). The biological oxygen demand, chemical oxygen demand, and biodegradability of HPDACS under different water quality were measured under static conditions, as well as the concentration changes before and after degradation. Environmental scanning electron microscopy (ESEM) was used to observe the micromorphology before and after degradation. The biodegradability, viscosity change, and molecular weight change of the polymer before and after passing through the porous medium were measured. The results were compared with the partially hydrolyzed polyacrylamide and the dendritic polymer. The results showed that in bacteria‐containing sewage, the biodegradation rate of HPDACS reached 81%. Moreover, the molecular backbone of HPDACS was completely broken after degradation. Its viscosity loss reached 84.87%, indicating its good biodegradability. HPDACS also can reduce the concentration of polymer in the produced fluid. In core flow experiments, viscosity of HPDACS is loss to 40%. The hyperbranched network structure of HPDACS can reduce the shearing action in the porous medium, thus reducing the extent of biodegradation. The presence of microorganisms resulted in a viscosity loss of HPDACS of ~2%. Therefore, HPDACS can fully exert the fluidity control effect through the porous medium and can meet the requirements of polymer flooding.

show abstract

Seepage flow characteristics and ability for enhanced oil recovery based on ultra high molecular weight partially hydrolysed polyacrylamide

Cited by 6 publications

References 0 publications

Mobility control capability of a modified chitosan hyperbranched polymer in porous media

Mobility control capability of a modified chitosan hyperbranched polymer in porous media

Shearing and Mixing Performance of Ultrahigh-Molecular-Weight Hydrolyzed Polyacrylamide (HPAM) Solution in a Helixes Static Mixer

Study on the biodegradability of a chitosan‐modified hyperbranched polymer for enhanced oil recovery

Contact Info

Product

Resources

About