Improvement of drilling fluids for wells under complex thermobaric conditions
Due to the natural depletion of hydrocarbon reserves in the Mesozoic deposits of the majority of exploited deposits in the North Caucasus in order to further develop the oil and gas production industry in the region, active involvement in the development of the carbonate complex of the Jurassic of the Western Ciscaucasia is necessary. The construction of deep exploration wells in complicated mining and geological conditions requires the use of special technologies and technological solutions using the experience of drilling similar wells. Consideration is given to research results for improvement of return emulsions compositions with the purpose to increase their thermal stability for drilling of deep wells in the complicated mountain-geological conditions. It is recommended to increase the stability of emulsions by introducing a co-emulsifier which affects the physical, mechanical and chemical properties of the emulsifier and emulsion. The mechanism of selection of co-emulsiiers for obtaining hydrophobic emulsions with thermostability up to 170 °C, the results of experimental studies, emulsion formulations and practical recommendations for treating wells with high reservoir temperatures are presented.