Mechanism of sodium tripolyphosphate inhibiting the syneresis of HPAM hydrogel

Chen, Lifeng; Zhang, Guicai; Ge, Jijiang; Jiang, Ping; Zhu, Xiaoming; Ran, Yunling; Liu, Dexin

doi:10.1039/c5ra19465b

Cited by 11 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a type of polymers, partially Hydrolyzed Polyacrylamide (HPAM) has been widely used as the main agent of the polymer gel because of its reasonable cost and high efficiency, which is a polyelectrolyte macromolecule with a flexible chain [11][12][13][14][15]. As a type of cross-linkers, the aspiration to use high valence metal ion (Al 3+ or Cr 3+ ), provided in the form of polynuclear olation complex ion (AlCit or Ac 3 Cr), is remarkable due to its economic cost and good adaptability.…”

Section: Introductionmentioning

confidence: 99%

Influence of salinity on the properties of the different HPAM/Al³⁺systems

Zhang¹,

Khan²

2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

In order to achieve oil increment and water cut reduction in the heterogeneous oil reservoirs, a conformance control technology by using HPAM/Al 3+ systems has been widely used due to the low price and environmental friendliness. However, the complex structure and state of high-valent metal ions in brine water can directly affect the properties of the different HPAM/Al 3+ systems, which may lead to unreasonable applications. Therefore, in order to better utilize the HPAM/Al 3+ systems, the characteristics of gelation of HPAM and the three types of aluminum citrate under different salinities are systematically studied. Experimental results show that an important reason for the cross-linking reaction of HPAM/Al 3+ being affected by salinity is that the morphology and structure of the aluminum citrate complex is different under the different salinities. Although the change of characteristics of the reaction time and the cross-linking degree of the three HPAM/Al 3+ systems are different, the process of the cross-linking reactions of the three HPAM/Al 3+ systems are the same. Besides, the thermal stability of the HPAM/Al 3+ gels is weakened with the increasing of salinity regardless of the ratio of citrate ligands to Al 3+ . According to the matching relationship between salinity and HPAM/Al 3+ systems, the reaction time can be controlled to achieve the requirements of on-site construction operation for the conformance control of a given heterogeneous oil reservoir.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of salinity on the properties of the different HPAM/Al³⁺systems

Zhang¹,

Khan²

2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

show abstract

“…Increasing the dosage of HPAM can decrease the hydrogel syneresis, but high concentration of HPAM leads to high injection pressure, which brings an adverse effect to the site construction in an oilfield. , Therefore, many new polymers have been developed to prepare the hydrogels with high stability. Although a fairly wide number of new polymers have been described in the literature, − only a relatively small number of them, including acrylamide copolymers of 2-acrylamido-2-methylpropanesulfonate (AMPS), N -vinylpyrrolidone (N-VP), and N -vinyl acetamide (N-VA), have been commercialized. These novel polymers were generally found to possess excellent thermal stability, but the syneresis problem of the hydrogels formulated with these polymers is still inevitable, since their dosage in the hydrogels is limited by their unreasonable cost.…”

Section: Introductionmentioning

confidence: 99%

Ultrastable Hydrogel for Enhanced Oil Recovery Based on Double-Groups Cross-Linking

Chen

Zhang

et al. 2015

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Acrylamide copolymer hydrogels used in profile modification applications in an oilfield share a common problem, termed syneresis, which decreases the efficiency of profile modification. In this paper, sodium tripolyphosphate (STPP) was found to be an effective syneresis inhibitor for the hydrogel formulated with acrylamide copolymer of acryloyloxyethyl trimethylammonium chloride (AM/DAC), and an ultrastable hydrogel for enhanced oil recovery in high-temperature and high-salinity petroleum reservoirs was obtained on the basis of double-groups cross-linking. Experimental investigations, including DLS, FTIR, NMR, SEM, and core flood test, have been conducted to elucidate the mechanism of STPP inhibiting the hydrogel syneresis in the aspect of the reaction between STPP and AM/DAC. The result showed that the AM/DAC cross-links with STPP on the basis of the hydrolysis reaction of the ester group and STPP, whereby the new bond of C–O–P is formed. For this reason, the viscosity and hydrophilicity of AM/DAC were significantly increased by STPP, and the generated double-groups cross-linking (AM/DAC cross-linked with phenol-formaldehyde, AM/DAC cross-linked with STPP) made more AM/DAC molecule chains cross-linked together; therefore, the stronger grid structure was formed. Therefore, the increase of the hydrophilicity and the improved stability of grid structure enhanced the water-holding capacity of the hydrogel, leading to the decrease of the hydrogel syneresis and the increase of the water-shutoff efficiency.

show abstract