关键词: 压裂液, 回收, 再利用, 废液处理, 功能模块

Abstract: TAs Changqing Oilfield’s exploration and development is unfolded on a larger scale, the environmental issue becomes a focus of attention because water consumption and waste water increase year by year. Based on the design of functional module, the fracturing fluid recovery and recycling device is developed for oil and gas fields. The device is composed of a series of functional modules, such as oil and sand removal, coagulation - settlement - filtration - disinfection, sludge treatment and water quality testing. Each functional module can be combined with one another according to actual need, suitable for recovering and handling fracturing fluid under various conditions. The post-treatment water turbidity is low with the removal rates of suspended solids and high valence ion exceeding 90 percent and 70 percent separately. Suspended solids in the water is less than 10mg/L, petroleum less than 10mg/L, Ca²⁺ less than 100mg/L, Mg²⁺ less than 100mg/L, total ferrous content less than 10mg/L and pH 6.5 to 7.5, meeting the recycling requirements. This device has been used for more than 100 horizontal wells on blocks of Longdong, Ansai, Sulige and Jingbian of Changqing Oilfield. The recovery and recycling rate of fracturing fluid flowback exceeds 80 percent, saving more than 100,000 cubic meters of water and significantly lowering operational cost for production. The device has effectively solved the environmental issue in the oil areas.

Key words: fracturing fluid, recovery, recycling, waste water treatment, functional module