The effect of the viscosity of borehole products on the operation of pumping equipment and the coefficient of oil recoveryShamil Mingulov, Vyacheslav Sh. Mukhametshin, Rif Vafin, Ruslan Gilyazetdinov and Dina KobishchaE3S Web Conf., 494 (2024) 02010DOI: https://doi.org/10.1051/e3sconf/202449402010