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Polyurethanes are special nonionic polymers which had a wide range of applications nowadays. The purpose of this work is to produce different nonionic polyurethanes by the reaction of polyethylene glycols with different molecular weights (4000, 6000, 10.000 and 20.000 g/mole) and toluene diisocyanate. The structures of the obtained polyurethanes were determined using molecular weight measurements, Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H-NMR). The effect of the synthesized polyurethanes on the rheological properties of two drilling fluids was studied. The polyurethane polymers were influenced the filtrate loss of the drilling fluids in comparison to the blank. The results showed that the synthesized polyurethane nonionic derivatives were effective in enhancement of the shear thinning non-newtonian drilling fluids that following the modified power Law Model (Herschel Bulky Model). The other rheological properties of the formulated drilling water base muds including: apparent viscosity (AV), plastic viscosity (PV), yield Point (YP), and gel strength were improved considerably compared to the commercial formulation.

Preparation and evaluation of nonionic polyurethane polymers in improving the rheological properties and filtrate loss control of water base muds