| 摘要 |
Drilling waste resulting from drilling processes of oil and gas wells using hydrocarbons based drilling fluids contains not only hydrocarbons but also the separated cuttings, and other organic and inorganic additives. This kind of waste contains a considerable amount of hydrocarbons and is classified as a hazardous waste. The present invention claims a method for remediation of said drilling waste, where the drilling waste is converted to a solid fuel that is environmentally friendly for storage, transportation and incineration. The said solid fuel no longer presents danger to the surrounding area and groundwater and has an economical energy value. Using several treatment stages, the residual emulsifiers in the drilling waste are chemically in an acidic milieu destabilized and the soil is turned accessible to the hydrocarbons. By using a polyelectrolyte in aqueous slurry, the hydrocarbon molecules are coagulated and, under normal conditions, irreversibly homogenously adsorbed on the soil particles. Finally, separation and dewatering of the said solid fuel can be easily accomplished. The process secures immobilization of the hydrocarbons and no loss in BTU value of the original drilling waste. The BTU value of the converted fuel can be increased by separation of large particulates from the aqueous slurry before immobilization of the hydrocarbons. After rinsing the separated particulates with water, they become free of hydrocarbons and can be left onsite.
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