油基钻屑低温热脱附处理工艺模拟

Simulation Study on Low Temperature Thermal Desorption of Oil-based Drilling Cuttings

为减少油基钻屑对环境的不良影响和危害,并最大限度地回收资源,提出采用低温热脱附的方式对其进行处理。通过钻井液油水固相分离装置并结合正交实验法对低温热脱附处理工艺进行模拟研究,选用热重分析仪及气相色谱研究油基钻屑热解失重规律以及回收油总石油烃分布。结果表明:低温热脱附处理油基钻屑的主要影响因素为处理温度,其次为停留时间,升温速率影响最小,350℃处理温度下,即可将油基钻屑热脱附残渣含油率降至0.3%以下,满足GB 4284—2018《农用污泥污染物控制标准》;油基钻屑中含水率的增加有利于提高低温热脱附效果,原料含水率在5%~10%时热脱附效果及经济性最好;低温热脱附回收油品质好,和原料总石油烃分布基本一致。

In order to reduce the adverse impact and harm of oil based cuttings on environment and to recover resources to the maximum extent,a low temperature thermal desorption method to treat oil based cuttings was proposed.This low temperature thermal desorption process was simulated by drilling fluid oil water solid phase separation device and orthogonal experimental method.In addition,thermogravimetric analyzer and gas chromatography were used to explore the weight loss rule of oil based drilling cuttings pyrolysis and the distribution characteristics of total petroleum hydrocarbon of recovered oil.The results indicated that the treatment temperature was the main influencing factor of low temperature thermal desorption,the residence time was the second,and the heating rate is was the least.At 350℃,the oil content of oil-based drilling cuttings thermal desorption residue could be reduced to less than 0.3%,meeting GB 4284—2018“Control Standards of Pollutants in Sludge for Agricultural Use”;the increase of water content in oil-based drilling cuttings was beneficial to improve the thermal desorption effect at low temperature.Both the thermal desorption effect and economy were the best when the water content of raw material was 5%-10%.Therefore,the recovered oil will have good quality by the low temperature thermal desorption,and the total petroleum hydrocarbond distribution is basically consistent with raw materials.