Z. Naturforsch. 2014, 69b, 1131 – 1140
Impact of Temperature on the Solution Conformation and Performance of AMPS®- and AHPS-based Fluid Loss Polymers in Oil Well Cement
Constantin Tiemeyer and Johann Plank
Chair for Construction Chemistry, Institute of Inorganic Chemistry, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
Reprint requests to Prof. Dr. Johann Plank. Phone: ++49 89 289 13151. E-mail: sekretariat@bauchemie.ch.tum.de
Received May 5, 2014 / published online December 19, 2014
Herrn Professor Hubert Schmidbaur zum 80. Geburtstag gewidmet
A copolymer composed of 2-acrylamido-2-methyl propane sulfonic acid (AMPS®) and N,N-dimethylacrylamide (NNDMA) as well as a forpolymer based on AMPS®, NNDMA, 1-allyloxy-2-hydroxy propane sulfonic acid (AHPS) and acrylic acid (AA) were synthesized and tested for their temperature stability. Both polymers were dissolved and aged in cement pore solution at temperatures between 100 and 220°C and 35 bar pressure, simulating conditions in actual well cementing. The influence of this high-temperature treatment on the fluid loss performance was assessed via high-pressure filtration tests. Water retention capacity and adsorption of AMPS®-co-NNDMA was found to decrease as a result of temperature-induced shrinkage of the stiff, linear polymer chain, as evidenced by dynamic light scattering (DLS) measurement of its hydrodynamic radius. Oppositely, the AHPS-based fluid loss additive did not exhibit coiling under high-temperature conditions. Therefore, its adsorption remained unaffected, and a stable fluid loss performance was observed.
Key words: AMPS®, 1-Allyloxy-2-hydroxy Propane Sulfonic Acid (AHPS), Fluid Loss Additive, High-temperature Polymer, Oil Well Cement
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