Process for recycling diesel oil in waste oil base drilling fluid

Abstract

The invention relates to a process for recycling diesel oil in waste oil base drilling fluid. The process is characterized by comprising the following steps: separating the diesel oil from the waste oil base drilling fluid, and purifying the separated waste diesel oil, wherein the step of separating the diesel oil from the waste oil base drilling fluid comprises the following specific steps: (1) adding water to dilute the waste oil base drilling fluid, and (2) carrying out thermal chemical demulsification-centrifugal separation on the waste oil base drilling fluid; the step of purifying the separated waste diesel oil comprises the following specific steps: (1) performing centrifugal pretreatment on the waste diesel oil; (2) performing flocculation-centrifugal treatment on the waste diesel oil; (3) performing pickling-centrifugal treatment on the waste diesel; (4) performing alkali wash-centrifugal treatment on the waste diesel; and (5) performing hargil adsorption-centrifugal-filtration treatment on the waste diesel. The process disclosed by the has the advantages that firstly, the recycling rate of the diesel oil in the waste oil base drilling fluid is 80%, secondly, grain impurities, colloid, asphaltene and other oxides in the diesel oil can be removed, thirdly, the recycled diesel oil is pure in color and smell and good in quality, and the standard of reprepared oil base drilling fluid is achieved, and fourthly, the process is simple, the operation is convenient, the production cost is low, and the recycling rate of the diesel oil in the purification is 80%.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of waste oil-based drilling fluid, in particular to a process for recovering diesel oil in waste oil-based drilling fluid. Background technique [0002] At present, drilling fluids mainly include oil-based drilling fluids and water-based drilling fluids, among which oil-based drilling fluids account for 60% of the global drilling fluid market. Compared with water-based drilling fluid, oil-based drilling fluid has the advantages of high temperature resistance, good lubricity and little damage to oil and gas layers, so it is very suitable for applications in difficult wells, wells in easy-to-collapse formations and wells with special processes in various complex formations. universal. However, due to the higher cost of development and use of oil-based drilling fluids than water-based drilling fluids, and the high technical requirements during use, their performance deteriorates aft...

AI Technical Summary

Problems solved by technology

There are relatively few domestic and foreign research reports on the regeneration process of waste diesel oil, mainly including: sedimentation-flocculation-adsorption process, sedimentation-centrifugation-coagulation refining-adsorption-filtration process, etc.; this type of process has poor regeneration effect on waste diesel oil. The quality of regenerated diesel oil is often difficult to meet the standard of recycling, and the waste residue and waste liquid generated in the purification process cannot be effectively treated, and the cost of the diesel recovery process will be further increased when the waste residue and waste liquid are treated separately, so this Class methods are more expensive to process

At present, there are almost no research reports on the regeneration process of diesel oil recovered from waste oil-based drilling fluid at home and abroad. Therefore, it is very necessary to explore a regeneration process suitable for recovering diesel oil from waste oil-based drilling fluid.

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