Centralized treatment process of oil field fracturing wastewater

Abstract

The present invention discloses a centralized treatment process of oil field fracturing wastewater, belonging to the field of development of low permeability oil fields. The process at least comprises: 1) removing impurities; 2) sampling and determining agent addition dosage; 3) adding agents; 4) mixing with stirring; 5) standing and settling; 6) filtrating and sterilizing; and 7) filter-pressing. The equipment and facilities used in fracturing wastewater treatment are arranged with a skid-mounted structure, wastewater from each well site is transported by a pipeline through custody transfer, so that centralized treatment and unified deployment of fracturing wastewater are achieved. According to the treatment process, the limitation of single-point distributed treatment of fracturing wastewater is effectively resolved, and the treatment efficiency of wastewater is substantially improved; the input cost of fracturing wastewater is substantially decreased, and the reuse performance is improved; through centralized treatment or recycled treatment of the treated wastewater and waste residue, the impact of wastewater and waste residue to the environment is reduced, so that economic practicality of oil field pollution abatement and clean production is provided.

Description

technical field [0001] The invention relates to the field of low-permeability oilfield development, in particular to a process for treating oilfield centralized fracturing wastewater. Background technique [0002] Low-permeability oilfields refer to oilfields with low permeability, low abundance and low single-well productivity. Due to the current situation of low pressure, low abundance, and low permeability, it has always been necessary to rely on fracturing formations to generate artificial diversion fractures for production. The so-called fracturing formation refers to a method in which hydraulic action is used to form cracks in the oil layer during the oil production process. After the fractured oil well formation is suppressed, the residual waste liquid in the ground fracture and oil casing must be returned to the ground by the formation pressure. The discharged waste water contains a large amount of fine sand, suspended solids, mechanical impurities, compressed Fissu...

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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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