GC-MS测定白油及油基钻井液回收油烃类组成方法研究

Study on Determination Method of White Oil and Recycled Oil From Oil-based Drilling Fluid by GC-MS

白油、回收油样品经三氯甲烷稀释60倍,使用50∶1的分流比,在柱温50℃的情况下以1 mL·min-1的流速进样,样品分离效果较好。同时采用分段式升温程序,针对含量较高的主体碳数物质,降低升温速率,提升物质脱附效率,最终实现了白油、回收油各组分的高效分离。通过实验发现,回收油比白油的碳链分布更为广泛;白油、回收油的密度相同,且都不含水与固相;回收油的开口闪点、倾点、运动黏度等性能与白油相近。研究表明,减压蒸馏技术对废弃油基钻井液的固液分离是非常彻底的,废弃油基钻井液经过钻井使用、减压蒸馏后,作为基础油的白油发生了裂解,但并不会影响使用性能,可以作为配制油基钻井液连续相的基础油使用。因为不同批次废弃油基钻井液的配方和材料是不同的,所以需要对不同批次的回收油进行性能检测,确定合格后才可以进行回用。

The samples of white oil and recovered oil were diluted 60 times with chloroform, the split ratio of 50∶1was used, and the sample was injected at the flow rate of 1 mL·min-1 at the column temperature of 50 ℃,the sample separation effect was good. At the same time, the segmented heating program was adopted to reduce the heating rate and improve the material desorption efficiency for the main carbon number substances with high content, and finally realize the efficient separation of white oil and recovered oil components. It was found that the carbon chain of recovered oil was more widely distributed than that of white oil;The density of white oil and recovered oil was the same, and there was no water and solid phase;The open flash point, pour point and kinematic viscosity of the recovered oil were similar to those of white oil. The research shows that the vacuum distillation technology is very thorough for the solid-liquid separation of waste oil-based drilling fluid. After drilling and vacuum distillation, the white oil as the base oil is cracked, but it will not affect the service performance. It can be used as the base oil for preparing the continuous phase of oil-based drilling fluid. However, because the formulas and materials of different batches of waste oil-based drilling fluid are different, it is necessary to test the performance of different batches of recovered oil and reuse it after it is determined to be qualified.