For offshore drilling, one of the biggest drilling waste is sewage which grows out of drilling fluids, rain, water used to wash bits and cool water. Usually, the under-treated sewage weighs 30 times the well-bore volume. Therefore, sewage minimization is a very vital part in the whole waste treatment. However, as the the easiest waste resource to be reduced, water can be reduced in such ways as below: one-way cooling system can save water and seal it inside the system while eliminating cooling water, braking water and sealing water to achieve water recycling. It is proved that it is not pricey to recycle the water and is able to save a large amount of liquids.

The reason that rain can be recycled is the correlation between drilling fluids and water. Rain is applicable in washing drilling equipment. The water used to wash drilling equipment can flow into water tank just like rain and should be recycled till it cannot function any more. It will be surprising to see how many times they can be reused.
 

The dirtiest water ( such as, deserted drilling fluids ) can be applied to wash the panel. Desander and filter can produce massive deserted drilling fluids (  usually there is one portion of solid phase in 2 or 3 portions of fluid phase ). They can be used to wash drilling mud tank. And shale shaker and decanter centrifuge also need washing water. Water used to clean panel do not need purifying since it is not necessary to wash away solid phase and liquid phase with clean water. It will be very difficult to separate them during treatment procedure.

It is necessary to produce sewage. It is quite expensive to treat sewage, so vacuum device is preferable to wash water here. A gun-shaped controller with tube is a good idea. The tube falls and automatically closes the connection to disconnect the controller. Drilling operators prefer high-pressure, small-volume washer due to the less labor intensity, better washing effects and reduced sewage volume. Generally speaking, both the vacuum device and washer are put into use when treatment is not costly. However, the gun-shaped controller will offset the cost. Different approaches can be conducted to separate and treat waste, for instance, water-based waste and oil-based waste can not blend until being managed together. During the operation, fluid from drilling mud pits should be reinjected so as to flow into spare drilling mud pits.

KOSUN has been providing the drilling fluids solids control equipment and solids control system for more than 20 years, main 5-stage solids control equipment include the shale shaker, shale shaker screen, desander, desilter, vacuum degasser, centrifugal pump, submersible slurry pump, shear pump, mud agitator, mud gun, drilling fluids mud cleaner, decanter centrifuge, jet mud mixer, mud tank, diesel tank, water tank, etc.