Research on plasma technology for treating oil-based drilling cuttings
The increasing amount of oil-based drilling cuttings is generated during oilfield extraction process with the development of the petrochemical industry,which would result in serious harm to human living and natural environment.Thermal plasma has the characteristics of high temperature,high energy density and controllable reaction atmosphere,which has obvious advantages in treating oil-based drilling cuttings hazardous waste.This article adopts plasma technology for harmless treatment of oil-based drilling cuttings,aiming to convert them into environmentally friendly amorphous substances through thermal plasma technology,thereby achieving harmless treatment of oil-based drilling cuttings.Firstly,the water content and oil content in oil-based drilling cuttings were tested through heat treatment,and the basic physicochemical properties of oil-based drilling cuttings were analyzed.Furthermore,the oil-based drill cuttings were directly fed into the plasma arc,and the microstructure,phase composition,and particle size distribution of the oil-based drill cuttings before and after plasma treatment were characterized.Finally,the influence of silica powder on the plasma treatment of oil-based drilling cuttings was investigated.Experimental results indicated that oil-based drilling cuttings were mainly composed of BaSO4,crystalline SiO2,and CaCO3.After plasma treatment,the morphology and structure of oil-based drilling cuttings undergo significant changes.There was a clear wide distribution of bulging peaks within the diffraction angle range of 20°～35°,and the content of amorphous material in the powder reached 43.8wt％.The glass content of oil-based drilling cuttings after plasma treatment further increased by adding SiO2 powders,and the final product achieved the content of 83.3wt％.At the same time,the concentration of metal elements such as Cu,As,Cd,Ba,Fe,etc.in the product leaching solution significantly decreased.Therefore,thermal plasma technology is effective in the harmless treatment of oil-based drilling cuttings and has good application prospects.
thermal plasmaoil-based drilling cuttingssilicaglass material
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