Novel process for comprehensively treating oily sludge of oil field

Abstract

The invention provides a novel process for comprehensively treating oily sludge of an oil field, which comprises processes for separating oil, water and sludge from the oily sludge. The process is characterized in that the processes for separating oil, water and sludge comprise a first process of fluidizing and pre-treating sludge, a second process of hardening and tempering the sludge, and a third process of mechanically separating the oily sludge; water separated through the processes can be used as process water to a circulating water recycling process; the separated cleaned oil enters an oil chamber of an oil-water separation device; and solid particles, namely the centrifuged sludge, are discharged through a screw conveyer. The process has the recovery ratio reaching 95 percent for recovering effluent oil to the utmost extent; and the treated sludge has water content less than 60 percent and oil content less than 2 percent, and can be used for underlaying a road of a well site or carrying out subsequent depth treatment. The process cyclically utilizes wastewater, prevents secondary pollution of sewage and slurry, and has large treatment capacity, wide treatment range, advanced technical proposal, high automatic degree, low operation cost, simple operation and clean production.

Description

technical field [0001] The invention relates to a new process for comprehensive treatment of oily sludge in oil fields, in particular to a new process for comprehensive treatment of oily sludge in oil fields. Background technique [0002] Oily sludge refers to the ground crude oil produced by oilfield enterprises in the production process of drilling, oil production, storage and transportation, the aged oily sludge placed for a long time, and the process of crude oil dehydration, sedimentation, oil storage, oil separation, flotation and other processes. Oilfield characteristic pollutants such as sludge. These pollutants are the main sources of soil pollution in oil regions. They have the characteristics of large discharge, fast migration and diffusion, large pollution area, and slow natural degradation. They have been listed as hazardous solid waste (HWO8). If it is not treated in time, it will have varying degrees of impact on the production area and the surrounding enviro...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of various types of oily sludge in various oil fields, complex components, and wide sources, various oily sludge treatment methods have certain shortcomings: single process, not strong pertinence, narrow application range, high one-time investment, and economical The benefits are low, and there is no mature and complete treatment process and equipment for oily sludge in China

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