Study on the co-pyrolysis characteristics of oil-based drill cuttings and lees

The co-pyrolysis characteristics of oil-based drill cuttings (OBDC) and lees were studied through investigating the effects of pyrolysis temperature, pyrolysis time, heating rate, and mixing ratio on the pyrolysis/co-pyrolysis products. X-ray diffraction (XRD), scanning electron microscope (SEM), gas chromatography-mass spectrometry (GC-MS), and thermogravimetric-mass spectrometry (TM-MS) were used to analyze the pyrolysis products and pyrolysis procedure. The results showed the presence of a synergistic effect between OBDC and lees in the copyrolysis process. Under optimal conditions: mass ratio of OBDC: lees at 7:3, holding temperature at 350 degrees C, holding time for 60 min and heating rate at 10 degrees C/min, the petroleum content in the solid product obtained from the mixed sample was 491.9 mg/kg, which complies with the grade A of GB 4284-2018. Agricultural Sludge Pollutant Control Standard. In addition, the quality of the liquid gas product and gas product by co-pyrolysis was improved. This study provides a reference for reducing the generation of hazardous pyrolysis substances in pyrolysis products, to prevent environmental hazards from the pyrolysis of OBDC or lees.

Automated summary

The co-pyrolysis characteristics of oil-based drill cuttings (OBDC) and lees were investigated, and the effects of various factors on the pyrolysis/co-pyrolysis products were studied. The presence of a synergistic effect between OBDC and lees in the co-pyrolysis process was observed. Under optimized conditions, the petroleum content in the solid product obtained from the mixed sample met the standards, and the quality of the liquid gas product and gas product was improved. This study provides valuable insights for reducing hazardous pyrolysis substances and preventing environmental hazards.