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RISS 인기검색어
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- 저자 : Xiangguo Lu (검색결과 3 건)
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Accelerating Dissolution of Polyacrylamide in Offshore Oil Field
Qin Yu,Xiangguo Lu,Defu Zhang,Kun Xie 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.10
The solubility of polyacrylamide significantly reduces the efficiency of polymer flooding in offshore oil fields, because of the low performance of polyacrylamide and the special environment. The objective of this paper is to investigate a novel approach to accelerate the dissolution of hydrolyzed polyacrylamide (HPAM) by adding a co-solvent cholamine (MEA). We investigated the effects of MEA on the microstructure and the performance of HPAM. Results showed that the addition of MEA and the temperature rise greatly shortened the dissolution time of HPAM, while improved the rheological property and seepage behavior. The enhanced solubility of polyacrylamide and the performance of polymer solution can be attributed to the enlarging of the molecular clew size, the stretching of molecular chains and the lowering of the glass transition temperature of HPAM. The new approach has high practical and the economic values for applications of the polymer flooding technology in offshore oilfields with complex reservoir conditions.
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Effects of the Charge Ions Strength on the Swelling of Organic–Inorganic Nanogels
Qin Yu,Xiangguo Lu,Jing Wang,Qi Guo,Liwei Niu 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.7
The swelling behavior and swelling mechanism of hydrogels can be greatly affected by the charge strength of ions in them. To investigate such effects, we prepared two gels: a carboxylic acid gel (CAG) and a poly(2-acrylamide–methyl propane sulfonic acid) gel (SAG) based on starchy polyacrylamide (PAM) nanocomposite gels, both with montmorillonite, which underwent in situ intercalation, and used them as probes in swelling experiments. The equilibrium swelling rates (ESRs) of the hydrogels in both salt water and acidic water strongly depended on the charge strength of the ions in the chains. SAG had a higher ESR than CAG at the same mole ratio of polymer/water, which is attributed to the greater electrostatic repulsion between the strong electrolyte ions of SAG. Both water salinity and hydrogen ion contact of the hydrogels weakened ESR with the enhancement of charge ionic strength. The downward trend of ESR with increasing concentration of salt or hydrogen ions became weaker in SAG compared to CAG, which is attributed to the shielding and deprotonation effects of the strong electrolyte ions. Regarding the swelling mechanism, the chain relaxation occurred in neutral and acidic solutions for SAG and in neutral and weak acidic solutions for CAG, but water diffusion dominated in strong acidic solutions for CAG, leading to different swelling behaviors.
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Weijia Cao,Kun Xie,Xiaoyan Wang,Xiangguo Lu,Xin He,Guorui Xu,Xiang Li 한국자원공학회 2020 Geosystem engineering Vol.23 No.4
Water plugging and profile control are becoming increasingly important in water-flooding oilfields. In this study, the experiments were conducted to determine the microscopic mechanisms and effects of water plugging, profile control, and ‘water plugging + profile control’. Initially, the starch graft copolymer and polymer gel used showed only slight changes in viscosity. However, within 12 h, the viscosities exceeded 100,000 mPa·s, which indicated that the two agents had good plugging effects. When the plugging agent was starch graft copolymer, the oil recovery with water plugging was 2% and 0.8% higher than the values for profile control with polymer gel on a heterogeneous core and parallel core, respectively. The recoveries with the ‘water plugging + profile control’ combination for the heterogeneous core and parallel core were 25.9% and 25.5%, respectively, which showed the superior enhanced oil recovery. The mechanism research showed that when the reservoir entered the middle and high water-cut development stages, the residual oil was mainly distributed in the middle- and low-permeability layers near the oil well. Thus, water plugging provided a greater increase in oil recovery. Under the actual demands of the Bohai oilfield, it would be better to adopt a combined water plugging and profile control operation.
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