Stability of Partially Hydrolyzed Polyacrylamides
Two chemical species are known to affect stability critically for partially hydrolyzed polyacrylamides (HPAM): divalent cations and oxygen. Effect of Divalent Cations. HPAM polymers are known to be unstable at elevated temperatures if divalent cations are present (Davison and Mentzer 1982; Zaitoun and Potie 1983; Moradi-
At elevated temperatures in aqueous solution, partially hydrolyzed polyacrylamides (HPAM) experience hydrolysis of amide side groups.
Stability of Partially Hydrolyzed Polyacrylamides
At elevated temperatures in aqueous solution, partially hydrolyzed polyacrylamides (HPAMs) experience hydrolysis of amide side groups. However, in the absence of dissolved oxygen and divalent cations, the polymer backbone can remain stable so that HPAM solutions were projected to maintain at least half their original viscosity for more than 8 years at 100掳C and for approximately 2 years at 120掳C.
At elevated temperatures in aqueous solution, partially hydrolyzed polyacrylamides (HPAM) experience hydrolysis of amide side groups. However, in the absence of dissolved oxygen and divalent cations, the polymer backbone can remain stable so that HPAM solutions were projected to maintain at least half their original viscosity for over 7 years at 100掳C and about 2 years at 120掳C.
Theoretical studies of hydrolysis and stability
Thermal stability of water-soluble polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) polymers under various solution conditions have been studied utilizing Quantum Mechanics Density Functional Theory (DFT) computational modeling method.
This work aims to improve the rheological properties of partially hydrolyzed polyacrylamide (HPAM) for enhanced oil recovery by using silica (or silicon dioxide, SiO2) nanoparticles (NPs). Novel aqueous HPAM-based SiO2 nanocomposites were formulated, and their rheological properties were investigated under different salinities, temperatures, and aging times.
Viscosity of partially hydrolyzed polyacrylamide under
Polymer flooding is the most successful chemical method to enhance oil recovery. This technique has achieved large-scale field application in China. Polymer flooding is also being tested in several heavy oil fields. For oil field applications, partially hydrolyzed polyacrylamide (HPAM) is the most widely used polymer. HPAM must maintain high viscosity to achieve good oil recovery.
with a weakly hydrolyzed polyacrylamide solution. INTRODUCTION This work aims at a better understanding of the inter- action and uptake mechanism of partially hydrolyzed polyacrylamides, used in 'tertiary' recovery of petro- leum, by the mineral substrate. Indeed, a stimulation
Sequence distribution of carboxyl groups in hydrolyzed
Sulfonated Polyacrylamides - Evaluation of Long Term Stability by Accelerated Aging at Elevated Temperature. 2025,, DOI: 10.2118/190184-MS. Johann Plank, Huiqun Li, Manuel Ilg, Julia Pickelmann, Wolfgang Eisenreich, Yan Yao, Ziming Wang.
Natural and synthetic high molecular weight compounds are used as thickening agents in paper industry, cosmetics, food processing etc. Partially hydrolyzed polyacrylamide (HPAM) is a synthetic
Polymers for conformance improvement - PetroWiki
Fig. 2 shows the chemical structure of polyacrylamide and partially hydrolyzed polyacrylamide. For polyacrylamide with a molecular weight of 7 million daltons (a representative molecular weight of an acrylamide polymer to be used in polymer waterflooding), the value of n in Fig. 2 and the number of repeating monomer units is on the order of
This work aims to improve the rheological properties of partially hydrolyzed polyacrylamide (HPAM) for enhanced oil recovery by using silica (or silicon dioxide, SiO2) nanoparticles (NPs). Novel aqueous HPAM-based SiO2 nanocomposites were formulated, and their rheological properties were investigated under different salinities, temperatures, and aging times.
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