Preparation of Hyperbranched Association Polyacrylamide and Its
Oil Displacement Properties

doi:10.11885/j.issn.1674-5086.2013.11.28.02

Abstract

Abstract:

Abstract：On account of the polymer′s molecule main chain，which is linear structure，and its poor thermal-salt resistance and
dissatisfied character under shearing stress of polymers which are used in enhanced oil recovery，we carried out the new polymer
′s preparation and the study of the performance. The hyperbranched water-soluble association polyacrylamide（HPAPAM）was
prepared. HPAPAM structure is confirmed by Fourier transform-infrared（IR）spectroscopy and H nuclear magnetic resonance（
1H NMR）spectroscopy，respectively. In the extra-dilute regime，the intra-molecular association occurred，the apparent
viscosity is low. With the increase of polymer concentration，the intra-molecular association gradually transferred to the intermolecular
association，which enhanced viscosity efficiency. Compared with conventional associative polyacrylamide，the
ultimate viscosity recovery is approximate 95% of original value after suffering super high shear force of mechanical stirrer（
67 s−1）for a period of 1 minute. For HPAPAM solution，the classical power-law fluid was exhibited in the whole range
of shear rates. Moreover，intermolecular association was enhanced by hyperbranched structure of polymer chains，resulting
in excellent thermal tolerance and salinity resistant. For instance，the viscosity of polymer solutions with 62 000 mg/L salt
concentration，is respectively 89% and 60% of initial values after 60 days aging at the temperature of 75 ?C and 80 ?C . After
98% water cut of water flooding，0.5 PV polymer agent whose viscosity is equal to crude oil and followed by water flooding
can improve 17.5% OOIP recovery. It provides a new understanding on the selection of polymer used in EOR applications.

Key words: hyperbranched association polyacrylamide, shear stress resistance, rheological property, thermal tolerance and
salinity resistant, enhanced oil recovery

Liu Rui1，2*, Pu Wanfen1，2, Peng Huan2, Zhao Tianhong3, Shang Xiaopei2. Preparation of Hyperbranched Association Polyacrylamide and Its
Oil Displacement Properties[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.11.28.02.

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