The Cyclonic Self-rotation Desorption Of Organic Pollutant In Shale Oil-based Drill Cuttings

The exploitation and development of shale gas is a strategic initiative to ensure the energy security and maintain the power structural completion of our nation.However,the process of shale gas drilling produces large amount of oil-based drill cuttings(OBDC).Containing toxic organic pollutant,OBDC is burdening and threatening the ambient eco-environment while the harmless treatment capacity of OBDC is restricting the shale gas exploitation scale.The method and equipment for OBDC green efficient disposal was researched in this paper,which is significant for theoretical and engineering practice.Methods of Computational Fluid Dynamics simulation,theoretical analysis on particle rotation in 3-dimensional swirling flow and cyclonic self-rotation deoiling experiment,etc.were adopted to reveal the mechanism of the toxic organic desorption in shale OBDC via interface vibration,to establish the mathematical model of organic pollutant desorption in OBDC,to put forward the technical principle of cyclonic self-rotation desorption for OBDC disposal and to build up a design method for OBDC self-rotation deoiling device.Then a prototype device with a disposal capacity of 10 kg/h for OBDC disposal was developed experiment.The result turned out that the best oil removal performance was acquired at a carrier gas flow rate of 85 m3/h,a temperature of 200?,and an OBDC feeding rate of 6 kg/h,i.e.the oil content of OBDC fell from 7.7%to 0.27%,and the efficiency reached 98.7%.Meanwhile,the energy consumption was 0.34 kWh/kg at a pressure drop of 9.5 kPa,which was lowered by about 70%compared to present thermal disposal methods.The research was of great significance to the development of OBDC non-(micro)-phase-transitional disposal technology and the large-scale exploitation of shale gas and was of remarkable reference value to the improvement of oil-containing porous solid waste disposal and transformative drying technology.