A centralized oilfield fracturing wastewater treatment system

Abstract

The invention discloses an oil field centralized fracturing waste water treatment system, which belongs to the field of low-permeability oil field development. The oil field centralized fracturing waste water treatment system is used for oil field fracturing flow back waste water treatment and at least comprises a fracturing flow back liquid storage pool, a water treatment system pipeline, a chemical dispensing and adding system pipeline, a sludge discharge system pipeline, relevant branch pipelines, relevant equipment, relevant valves, instruments and relevant circuits, wherein a waste water lifting pump, a pipeline mixer, a coagulation sedimentation tank, a water transfer pump, a middle water tank, a filtering pressurizing pump, a filter bag type filter, a filter core type filter, a sterilization device, a purified water tank, relevant valves and relevant instruments are sequentially connected onto the fracturing waste water treatment pipeline in the fracturing waste water flowing direction, the pipeline mixer is communicated with a flocculating agent chemical adding device and a coagulant aid chemical adding device of the chemical dispensing and adding system pipeline, the coagulation sedimentation tank is communicated with a press filtering system of the sludge discharging system, and the fracturing waste water treatment system is formed by adopting skid-mounted arrangement. The complete reuse of fracturing waste water can be effectively realized.

Description

Technical field [0001] The invention relates to the field of low-permeability oilfield development, in particular to an oilfield centralized fracturing wastewater treatment system. Background technique [0002] A low-permeability oil field refers to an oil field with low oil reservoir permeability, low abundance, and low single well productivity. Due to the current situation of low pressure, low abundance and low permeability, artificial diversion fractures have always been produced by fracturing formations. The so-called fracturing formation refers to a method of using hydraulic action to form fractures in the oil layer. After the fracturing oil well formation is under pressure, the residual waste liquid in the ground fissures and the tubing and casing pipes must be returned to the ground by the formation pressure. The returned waste water contains a large amount of fine sand, suspended matter, mechanical impurities, and pressure. Fracture fluid residues, dissolved organic matt...

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Problems solved by technology

The distribution of oilfield well sites in this area has brought great difficulties to oilfield measures and operation wastewater treatment. In order to solve the on-site problems of water treatment, oilfields currently mainly use tanker trucks, single-point treatment, natural Evaporation, recovery and reinjection and other technical measures have not been able to effectively treat and reuse the wastewater from well site measures with many distribution points and a wide area. The utilization rate is low and the cost is high. It is difficult to ensure that all reuse has become a single-point treatment. , Difficulty of decentralized disposal

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