الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Polyurethanes are special nonionic polymers which had a wide range of applications nowadays. This work aims 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 obtained polyurethanes’ structures 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 by the filtrate loss of the drilling fluids in comparison to the blank. The results showed that the synthesized polyurethane nonionic derivatives effectively enhanced the shear-thinning non-newtonian drilling fluids 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.