Зроблено аналітичний огляд основних моделей визначення впливу осідання земної поверхні на деформації обсадних колон нафтогазових свердловин.
We studied the gradient dependence of the effective viscosity η for the diluted solution of the polystyrene in toluene under three concentrations ρ = 0.5∙105, 1∙105 and 2∙105 g/m3 and for four polystyrene fractions with average molar weights М = 5.2∙104, 4.4∙104, 3.3∙104 and 1.8∙104 g/mol, in the temperature range of 293–308 K. The experiments have been carried out with the use of rotary viscometer “Rheotest 2.1” at various cylinder rotation angular rate ω (r/s).