Combined oilfield produced water treatment skid-mounting device

Abstract

The invention discloses a combined oilfield produced water treatment skid-mounting device. The device is characterized by comprising a buffering oil-removing tank, a cavitation air floatation tank, a microbial reaction tank, an efficient settling tank, an intermediate water tank, a filter group and an ultraviolet sterilizer, wherein a pontoon type oil receiver is arranged in the buffering oil-removing tank, and the buffering oil-removing tank is connected with the cavitation air floatation tank through a pipeline; a microbubble generator is arranged in the cavitation air floatation tank, and the cavitation air floatation tank is connected with the microbial reaction tank; a high-density biological filler and an anti-blockage aeration head are mounted in the microbial reaction tank, effluent of the microbial reaction tank automatically flows into the efficient settling tank, the efficient settling tank is connected with the intermediate water tank, and the intermediate water tank is connected with the filter group through an intermediate water pump; and the filter group is connected with the ultraviolet sterilizer, and the ultraviolet sterilizer is connected to a water injection tank. The combined oilfield produced water treating and skid-mounting device is assembled on site according to treatment water quantity and can be widely applied to the treatment of oilfield produced water, and the treated water quality reaches an A2-level index according to Water Quality Standard for Oilfield Injecting Water in Clastic Reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oilfield water treatment, and in particular relates to a combined oilfield produced water treatment skid-mounted device. Background technique [0002] Oilfield produced water is a by-product in the process of oilfield exploitation. In China, it is generally used to re-inject underground after treatment to increase formation pressure and improve oilfield recovery rate. [0003] Due to the different characteristics of crude oil, oil recovery methods, and geological conditions, the water quality of oilfield produced water is different, but there are commonalities. In addition to petroleum and suspended solid particles, the mining process also contains soluble salts, hydrogen sulfide and chemicals used to change water quality characteristics. Generally, it has the following characteristics: (1) High oil content, generally 100-1000mg / l, and 5000mg / l when high. Among them, 90% is suspended and dispersed oil; ...

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Problems solved by technology

However, the main problem of these processes is that the impact resistance is poor. When the incoming water changes greatly, the effluent cannot meet the requirements, and the recovery is poor, and special measures need to be taken to recover.

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