Abstract
Abstract A quadripolymer of acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and dimethyl diallyl ammonium chloride (DMDAAC) was synthesized by solution free radical polymerization, and characterized using Fourier transform infrared (FTIR), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA) methods. The rheological and filtrate properties of saturated brine-based fluid with AM/AMPS/NVP/DMDAAC quadripolymer were investigated before and after thermal aging tests. The apparent viscosity (AV), plastic viscosity (PV) and yield point (YP) increased and the filtrate volume decreased with increase in the concentration of AM/AMPS/NVP/DMDAAC quadripolymer after thermal aging test at 180°C for 16 h. The filtrate volume could be controlled when the concentration of AM/AMPS/NVP/DMDAAC quadripolymer reached 2.0% under these conditions. The filtrate volume of saturated brine-based fluid could be controlled effectively at a thermal aging temperature not exceeding 200°C and was smaller than that of the AM/AMPS/NVP terpolymer. The AM/AMPS/NVP/DMDAAC quadripolymer was better at improving the quality of a filter cake than the AM/AMPS/NVP terpolymer. The drilling fluid containing the AM/AMPS/NVP/DMDAAC quadripolymer had an excellent tolerance to salt and high temperature.
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