Oil-based drilling fluid drilling cutting while-drilling treatment method

Abstract

The invention discloses an oil-based drilling fluid drilling cutting while-drilling treatment method. The method is used for conducting oil-based drilling fluid recycling and drilling cutting while-drilling cleaning treatment on oil-based drilling fluid drilling cuttings produced in the drilling process. The method comprises the steps that 1, the oil-based drilling fluid drilling cuttings which are high in drilling fluid content and discharged out of solid control equipment such as a vibration screen, a desander and a centrifugal machine are subjected to diluting, mixing, stirring and smashing pretreatment through base oil; and 2, the oil-based drilling fluid drilling cuttings are subjected to spin dry through oil-based drilling fluid drilling cutting removing liquid, overflowed oil-based drilling fluid can be recycled, and then the drilling cuttings are subjected to solid-liquid separation through primary and secondary cleaning treatment agents to reduce the solid content. According to the oil-based drilling fluid drilling cutting while-drilling treatment method, the oil-based drilling fluid drilling cuttings produced in the drilling crew drilling process can be subjected to site while-drilling treatment, the oil-based drilling fluid in the drilling cuttings is recycled, and the cost is reduced. The oil content of the drilling cuttings subjected to cleaning treatment meets the environmental requirements for emissions on the site.

Description

technical field [0001] The invention relates to the field of petroleum drilling fluid processing methods, in particular to a method for processing oil-based drilling fluid cuttings while drilling. Background technique [0002] Oil-based drilling fluid system is commonly used in shale oil and gas drilling at home and abroad. A large amount of oily waste cuttings produced during the drilling process is quite serious for environmental pollution and cannot be discharged casually. Moreover, oil-based drilling fluid is expensive and needs to be recycled. Therefore, it is necessary to recover oil-based drilling fluid and treat cuttings while drilling for oil-based drilling fluid cuttings, and the processed cuttings can meet the national emission standards. [0003] At present, foreign oil-based drilling fluid drilling cuttings treatment methods mainly include: ① Drilling cuttings re-injection into the formation is used, also known as slurry fracturing injection. First, a re-injecti...

AI Technical Summary

Problems solved by technology

When the recovered oil-based drilling fluid has a high solid content, the process cannot perform solid-liquid separation. At this time, the recovered oil-based drilling fluid cannot be directly used in the drilling fluid circulation system; When the content is too high, the process cannot carry out solid-liquid separation. At this time, the comprehensive treatment agent can only be recycled into the waste liquid bin, resulting in an increase in the use of comprehensive treatment agent, which is uneconomical.

At the same time, the amount of waste liquid and its treatment cost are increased; in addition, the process does not have a secondary cleaning device, which affects the cleaning effect of drilling cuttings

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