30.06.2021 у. RAKHIMOV KHURSHID YULDASHEVICH was defended on the topic: «DEVELOPMENT OF EFFECTIVE COMPOSITE EMULSIFIERS AND OIL EMULSION DRILLING FLUIDS BASED ON THEM», in the specialties: 02.00.07- Chemistry and technology of composite, varnish paint and rubber, Materials. for the degree of Doctor of Philosophy in technical sciences (РhD).