Separation system and separation method for oil sludge and sand

Abstract

The invention discloses a separation system and a separation method for oil sludge and sand. The separation system comprises a liquid phase sand washing area, a settlement area and a gas phase sand washing area, and the gas phase sand washing area comprises a gas phase sand washing channel, a plurality of mixing chambers and a gas phase conveyor. According to the separation system and the separation method, the oil sludge and the sand are thoroughly separated through reverse flushing of the oil sludge and sand materials in the liquid phase sand washing area and gas phase sand washing in the gas phase sand washing area, so that the oil content of discharged sand is low, the separation system is not liable to be blocked, and the overall energy consumption is low; and by adjusting the operating parameters of the system, the particle size composition of discharged materials can be controlled. The separation system and the separation method of the oily sludge and the sand can be widely applied to the separation process of the oil sludge and the sand.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an oil sludge sand separation system and a separation method. [0002] technical background [0003] Oil mud sand refers to the mixture of mud, sand and water that is produced in oilfield production activities, mainly from various links in the crude oil gathering, transportation and processing process, and is polluted by crude oil and other organic matter. Because the hydrocarbon substances contained in the oil sludge are more harmful to the environment, they are listed in the "National Hazardous Waste List" as a hazardous waste item. At present, a large amount of oil mud sand is produced in the production process of various oil fields in the country, and its discharge has become an important factor that endangers the local environmental quality. [0004] Oil mud sand is a brown-black viscous substance with complex components, mainly composed of water...

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Problems solved by technology

Through experiments, the COD of the upper water in the grit chamber has increased significantly, which shows that the method involved in the patent can indeed make some organic matter fall off, but the whole process is one-time, and mud and petroleum will still adhere to the sand particles, and the separation is not complete. Disadvantages of high oil content

[0007] CN104338350A relates to an automatic cleaning device for filtering quicksand, wherein inside the sand washing chamber there are several sand washing rings with convex cross-sections. If the feeding port falls evenly at the center of the nozzle, the processing requirements can be met, but it needs to be processed The materials are usually in groups of different sizes, resulting in uneven falling, which will further cause the accumulation of materials on one side of the ring-shaped feeding port, and the phenomenon of less material on one side, requiring frequent parking and cleaning, which prolongs the processing time and increases the equipment. energy consumption

The feed port and the mud overflow port are both at the top of the device. During the operation, the feed material will be mixed with the material brought to the top of the device by the backwash water flow for desanding treatment, and the quality of the output from the mud overflow port cannot be guaranteed.

[0009] CN 108395902A and CN 207436969A disclose two kinds of mud and sand separation devices used in oilfields, mainly for the separation of mud and sand carried in crude oil, relying on the principle of mechanical vibration, although there is a certain separation effect, but the processing depth of mechanical vibration is limited, Components are severely worn, and often accompanied by noise during use, causing secondary pollution

[0010] Disclosed in CN107754453A is a kind of sand washer, which is to make the material channel into an "S" shape, which increases the mutual collision of materials in the conveying process to achieve the purpose of sand washing. If it is applied to the separation of oil, mud and sand, due to the The flow velocity is small, and it is difficult to wash off the oil and fine mud attached to the inside of the pipeline, which may block the pipeline after a period of accumulation

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