Case Studies

Produced Water Reinjection Project, Oilfield in China


In order to meet the needs of ultra-low permeability reservoir development, a considerable amount of groundwater has been exploited to serve as injected water to the low permeability reservoir, causing a huge waste of fresh water resources. It has been one of the important tasks of produced-water treatment for ultra-low permeability reservoir. Specifically, the produced water needs fine treatment to meet the requirements of the water quality for the ultra-low permeability reservoir to ensure its sustainable development. The oilfield produced water reinjection not only puts an end to the waste of fresh water resources, but also significantly reduces the cost due to the recovery of agents in the water.




Produced Water Reinjection

Water source

Produced water

Filtration solution

2 micron
15 m3/h - 66 gpm

The Challenge

The produced water quantity to be processed for Huanxiling oilfield is 15m³/h. After primary treatment, the oil content is 10mg/L or less and the suspended solids are 20mg/L or less. The particle size of the suspended solids is very small, with an average size of 2μm. The agents added to the water, especially the polymer, will increase the viscosity of water and cause ion release after exposure to air, making the water milky white. The requirements for output water: oil content ≤6mg/L, suspended solids ≤2mg/L, and the average particle diameter of suspended solids ≤1.5μm.

The Solution

After the primary treatment, the oilfield's produced water goes through the 2μm AMF93K cartridge filter. The detailed procedure is as follows:
Walnut shell filter filter separator AMF93K cartridge filter existing diatomaceous earth filter outlet.

The Results

During the period of more than one month after launching the AMF93K filter, the processed water amount has remained at 15m³/h, the equipment has functioned normally and 95% of onsite water quality tests have met the standard. One month after launching the equipment, the output water samples from the equipment were sent to a third party.

According to the third party test report, suspended solids and oil in the produced water after being filtered by the AMF93K have not been detected (very few) and their average particle sizes are 0.7μm and 0.81μm respectively, therefore the equipment meets design requirements.

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