Interfacial Shear Rheological Properties of Enhanced Oil Recovery Polymers with Different Structures†

doi:10.7503/cjcu20131241

Abstract

Abstract:

The interfacial shear rheological properties of ultra-high molecular weight partialhydrolysis polyacrylamide(PHPAM) and hydrophobically modified polyacrylamide(HMPAM) for enhanced oil recovery(EOR) were studied by biconical method at kerosene-water interfaces. The effects of time, strain amplitude and shear frequency on interfacial shear rheological data of different concentration PHPAM and HMPAM solutions were investigated. The experimental results show that the information for structure of interfacial film can be detected only under optimum shear frequency range. HMPAM molecules have interfacial activity and can adsorb onto the interface, which result in the enhancement of strength of interfacial film with aging time and the viscous nature at higher concentration. PHPAM shows no interfacial activity, which leads to time independence of shear rheological data and the elastic property of film. The interfacial shear complex moduli of HMPPAM are obviously higher than those of PHPAM because the interfacial net structure can be formed by HMPAM molecules through hydrophobic interaction. The experimental results of relaxation method show that the slow relaxation process related to destroy and restructure of interfacial net structure under shear deformation is responsible for the higher strength of HMPAM film.

Key words: Partial hydrolysis polyacrylamide, Hydrophobically modified polyacrylamide, Interface, Shear rheology, Kerosene

CLC Number:

O647

TrendMD:

LI Jing, YANG Yong, CAO Xulong, ZHANG Jichao, ZHANG Lei, ZHANG Lu, ZHAO Sui. Interfacial Shear Rheological Properties of Enhanced Oil Recovery Polymers with Different Structures^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 791.

Figures/Tables 11

Fig.1 Schematic diagram of interfacial shear rheometer based on bicone geometry

Fig.2 Effect of strain on the bulk(A) and interface-bulk(B) shear complex moduli for different concentrations of HMPAM solutions Concentration of HMPAM/(mg·L-1): ■ 500; □ 1000; ▲ 2000; △ 3000. Frequency: 0.03 Hz. (B) oil: kerosene aqueous; aqueous: HMPAM.

Fig.3 Effect of strain on the bulk(A) and interface-bulk(B) shear complex moduli for different concentrations of PHPAM solutions Concentration of PHPAM/(mg·L-1): ■ 100; □ 1000; ▲ 2000; △ 3000. Frequency: 0.03 Hz. (B) oil: kerosene aqueous; aqueous: PHPAM.

Fig.4 Dynamic interfacial shear elastic(A) and viscous moduli(B) for different concentrations of HMPAMConcentration of HMPAM in the interface of kerosene-HMPAM/(mg·L-1): ■ 500; □ 1000; ▲ 2000; △ 3000. Frequency: 0.03 Hz.

Fig.5 Dynamic interfacial shear elastic(A) and viscous moduli(B) for different concentrations of PHPAMConcentration of PHPAM in the interface of kerosene-PHPAM/(mg·L-1): ■ 100; □ 1000; ▲ 2000; △ 3000. Frequency: 0.1 Hz.

Fig.6 Effect of frequency on interfacial shear complex moduli for different concentrations of HMPAM Concentration of HMPAM in the interface of kerosene-HMPAM/(mg·L-1): ■ 500; □ 1000; ▲ 2000; △ 3000.

Fig.7 Effect of frequency on interfacial shear complex moduli for different concentrations of PHPAMConcentration of PHPAM in the interface of kerosene-HMPAM/(mg·L-1): ■ 100; □ 1000; ▲ 2000; △ 3000.

Fig.8 Comparison of interfacial shear complex moduli of polymers HMPAM(a) and PHPAM(b)Frequency: 0.1 Hz.

Fig.9 Effect of frequency on the interfacial shear elastic and viscous moduli of HMPAM(A) and PHPAM(B) (A) Concentration of HMPAM in the interface of kerosene-HMPAM/(mg·L-1): ■, □ 500; ▲, △ 1000; ▼, ▽ 2000; ★, ☆ 3000. (B) Concentration of PHPAM in the interface of kerosene-PHPAM/(mg·L-1): ■, □ 100; ▲, △ 1000; ▼, ▽ 2000; ★, ☆ 3000.

Fig.10 Decay curves of shear stress for different concentrations of HMPAM(A) and PHPAM(B) solutions Oil; kerosene; *train. (A) Concentration of HMPAM/(mg·L-1): ■ 500; □ 1000; ▲ 2000; △ 3000. (B) Concentration of PHPAM/(mg·L-1): ■ 1000; □ 2000; ▲ 3000.

Table 1 Characteristic parameters of interfacial relaxation for EOR polymers with different structures

EOR polymer	Concentration/ (mg·L^-1)	Δτ₁/ (mN·m^-1)	T₁/s	Δτ₂/ (mN·m^-1)	T₂/s	Δτ₃/ (mN·m^-1)	T₃/s	Δτ/ (mN·m^-1)
HMPAM	2000	0.12	1.8	0.14	13.5	0.06	90.9	0.32
	3000	0.54	3.6	0.42	25.6	0.17	181.8	1.13
PHPAM	2000	0.01	0.3	0.02	1.1			0.03
	3000	0.12	0.7	0.04	4.2			0.16

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