热洗法处理页岩气开采油基钻屑工艺研究

Research on hot washing process of shale gas oil-based drill cuttings

西南某油气公司页岩气开采油基钻屑样品成分复杂,处理难度大,在对其进行理化指标分析的基础上,采用热化学洗涤法进行基油分离处理。通过正交试验确定除油剂中各药剂对除油效果的影响程度:基油剥离剂>润湿反转剂>渗透剂;最佳加药量:基油剥离剂S的质量浓度为0.5 g/L,润湿反转剂CTAB的质量浓度为150 mg/L,渗透剂OT的质量浓度为50 mg/L。通过单因素实验优化工艺参数,考察了温度、pH、时间、洗涤次数、除油剂与油基钻屑的体积比对油基钻屑除油工艺的影响。结果表明:调节pH在4左右,V(除油剂)∶V(钻屑)为3∶1,洗涤温度为50℃,洗涤时间为1.5 h,基油分离后泥饼石油类物质质量分数低于1%,同时,分离液可循环用于新的油基钻屑稀释,分离效果良好。

Shale gas oil-based drill cutting samples from an oil and gas company in Southwest China have complex composition and are hard to treat. Based on the analysis of their physical and chemical properties,the hot chemical washing process is used to separate the samples. The effect of the composition of deoiling agent on the deoiling efficiency is studied by orthogonal experiment. The influencing order is shown as： base oil stripping agent wetting reversal agent penetrating agent. The optimal conditions are： 0. 5 g / L of base oil stripping agent,150 mg / L of wetting reversal agent CTAB and 50 mg / L of penetrating agent OT. The influences of temperature,p H,time,washing times,the volume ratio of deoiling agent and oil-based drill cuttings on deoiling process are studied by single factor experiment. The results show that the oil content in mud cake is lower than 1% after the separation of base oil under the following condition： 4 of p H,3∶ 1 volume ratio of deoiling agent and drill cuttings,50℃ of washing temperature and 1. 5 h of washing time. At the same time,the separation liquid can be recycled for the dilution of new oil base drilling cuttings and have a well separation effect.