This paper displays a new approach in downhole workover operations. Environmental pollution was resulted from downhole workover operations, such as spills of crude oil and produced water. These accidents can pose safety risks to operations, and has direct adverse impact on local people daily lives, public health, and agriculture etc. Workover operations are strictly regulated by HSE Management Standards.

After many years of practices, a series of multi-purpose clean downhole workover technologies have been developed and many types of equipment have been created, such as movable produced water treatment technology, to prevent spills of oil and produced water. These technologies and equipments have guaranteed green downhole workover in Daqing Oilfield.

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