Complete solutions for oilfield wastewater
The oilfield primarily generates produced water, drilling wastewater, and other types of oily wastewater at the field stations. Due to variations in oilfield production processes, environmental conditions, and other factors, numerous treatment methods are employed. When water injection is required, the treated oilfield wastewater is reinjected into the reservoir; in such cases, stringent control of suspended solids, oil content, and other water quality parameters is essential to prevent damage to the reservoir formation. If the oily wastewater is used as feedwater for steam generators or boilers, strict limits must be imposed on scaling-prone ions such as calcium and magnesium, total mineralization, and oil content. Furthermore, when the treated wastewater is discharged, it must comply with local effluent discharge standards.
According to the sources, elements and outlet requirements of oilfield wastewater, there are four kinds of treatment methods, including physical method (such as centrifugal separation method, coarse graining method, membrane separation method), chemical method(acidification method, chemical oxidation method, photochemical catalytic oxidation method), physical chemical method (such as flotation method, adsorption method, magnetic adsorption separation method) and biochemical method(such as activated sludge process, biological membrane process, etc. that belong to microbial treatment method). General oilfield wastewater treatment adopts the method of combining a variety of ways, common primary treatment includes gravitational separation, flotation and centrifugal separation, which mainly used to remove floating oil and oil wet solids; secondary treatment contains filtration, coarse graining, chemical treatment, etc. which mainly used for demulsification and removing dispersed oil; deep treatment contains ultrafiltration, activated carbon adsorption, biochemical treatment, etc. which used to remove soluble oil。
Based on the specific characteristics of each oilfield—such as water quality and effluent discharge requirements—BODA develops comprehensive wastewater treatment solutions tailored to oilfield applications. These solutions go beyond the core obligate microorganism product “Beijiaqing” to encompass representative processes for oilfield reinjection water, external drainage, and oil-fired boiler water reuse, among others. They integrate advanced technologies such as screening and the effective compatibility of specialized microorganisms, selection of membrane bioreactors, and advanced oxidation processes.
Enhanced treatment technology advantages of the obligate microorganism “Beijiaqing”:
Simple technological process, strong impact resistance of system, long-term stable effluent water quality.
Strong bioactivity and a short commissioning period—typically only 7 to 10 days.
No chemical agents are used; the treated effluent requires no further modification, exhibits excellent compatibility with the formation, and ensures long-term stability of water injection pressure.
Low sludge production essentially meets environmental protection requirements and requires only drying treatment.
The system features simple operation, a high degree of automation, and low labor intensity.
Safe, environmentally friendly, and free of secondary pollution
Nearly one hundred industrial applications have been implemented at PetroChina, Sinopec, CNOOC, and Yanchang Oilfield, earning high praise from all users, including oilfields in Xinjiang, Daqing, Changqing, Yanchang, Huabei, Jiangsu, Zhongyuan, Jilin, and others.
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