Study on Chemical Cleaning Technology of Oil-Based Drilling Cuttings
As oil-based drilling cuttings contain a variety of drilling fluid treatment agents, direct chemical cleaning method not only requires a large number of cleaning agents, but also has low cleaning efficiency. In this study, the oil content of shale shaker and centrifuge cuttings pretreated with drilling fluid base oil (white oil) decreased from 15.58％ and 13.05％ to 6.57％ and 6.22％, respectively. The comparison between the recovered oil and the white oil prepared drilling fluid system showed that both of them had no coalescence and showed good viscosity performance, indicating that the pretreated recovered oil can be reused. Under the cleaning condition of 25 ℃, 500 r·min-1 and cleaning for 20 min, the oil content of the untreated shale shaker cuttings was reduced to below 1％ only when the mass fraction of the SDBS/AEO-5 composite system reached 7％, while the oil content of the pretreated shale shaker cuttings was reduced to 0.64％ by using the 3％ SDBS/AEO-5 composite system, which indicated that the pretreatment process effectively improved the cleaning efficiency and reduced the amount of cleaning agent. In addition, the APG/TO-5 composite system was used to clean the pretreated centrifuge and shale shaker oil-based drilling cuttings. When the mass fraction of the composite system was 2％, the oil contents of both were reduced to less than 1％, which further explained that the pretreatment process can improve the selection range of surfactants, and to some extent, it can alleviate the problem of poor universality of cleaning agents.
Oil based drilling cuttingsPretreatmentSurfactantRecycled oilOil content
NETL
NSTL
万方数据
