Advanced Water Treatment Technology for Turpan Hami Oilfield: CDFU System for Produced Water Treatment

Turpan Hami Oilfield Characteristics

The developed blocks of the Turpan Hami Oilfield mostly belong to low-porosity, low-permeability reservoir types. These reservoirs feature multi-layered structures with significant heterogeneity and are also plagued by serious issues such as water sensitivity, salt sensitivity, and rate sensitivity. Due to the "low-porosity, low-permeability" reservoir properties, the Turpan Hami Oilfield has strict water quality standards for the injected water. If untreated wastewater is injected into the formation, it will reduce the formation's ability to absorb water, adversely affecting the water flooding efficiency and the normal progress of water injection development in the oilfield.

The oilfield's injection capacity cannot meet the needs for injection-production balance, resulting in a low level of formation pressure maintenance and limiting the maximum potential of oilfield production. In the process of injecting treated wastewater, the water quality gradually deteriorates, and impurities such as suspended solid particles, corrosion products, and bacteria are reinjected into the formation, leading to pore blockage and a decrease in the water absorption capacity of injection wells. Some injection wells may even become under-injected. Once the dissolved oxygen, bacteria content, and carbon dioxide content in the injection water exceed the standard, the corrosiveness of the injection water increases. The corrosion of water treatment equipment is primarily evident in the corrosion perforation at the weld joints.

SINOKLE's Oilfield Produced Water Treatment Technology

The Shenzhen Clear Science & Technology Co., Ltd (SINOKLE) has developed a pioneering new generation of efficient, compact, closed-pressure flotation technology — CDFU: Cyclonic Dissolved Gas Flotation Unit — by combining cyclone separation with new-generation microbubble generation technology and dissolved gas flotation technology.

In 2018, two CDFU units were used in the Turpan Hami Oilfield to treat the oilfield produced water. Under the conditions of influent oil content ≤ 1,000mg/L and suspended solids ≤ 500mg/L, the effluent oil content was ≤ 10mg/L and suspended solids ≤1 0mg/L, with an oil removal rate of 99% and a suspended solids removal rate of 98%.

Pic 1: On-site Equipment

Pic 2: Treatment Results