Brightway Dewatering Unit includes a contained automatic flocculation unit with pumps, polymer preparation tank and mixing system. Dewatering system uses coagulant and flocculants chemicals including Poly Aluminum Chloride( PAC) and Poly Electrolyte(Polymer) to coagulate and flocculate the solids in the fluid and make the slurry in a condition that centrifuge can separate the solids from the mixture more convenient. Cuttings generated in the dewatering system are discharged by the centrifuge in the corral; liquid is discharge straight to one of the buffer tanks.
The Dewatering suction lines could be connected to middle mud pit and all ES tanks.
The gathered waste water in the waste pit or the amount of the mud which the mud engineer wants to dump ( usually at the end of drilling sections) should be transferred to the ES tanks or the mud pit and from there could be processed by dewatering system.
The overall objective of dewatering systems is to process drilling waste. Typical applications are:
Reduction of the liquid waste volume generated
Recycling back into the active fluids system
Release in an environmentally safe and cost effective manner.
The main aim is to reduce well costs, either through a reduction in fluid volume used during the well, and /or through a reduction in disposal costs.
Dewatering systems have become major factors towards “closing the loop” in the dry location or zero discharge concept. The displaced or excess drilling mud along with the excess location liquids produced on the dry or zero discharge location are channeled to the collection pit and placed in the storage system. The dewatering system is utilized to process the liquid waste from the active mud and the storage system. The cleaned effluent from the dewatering system can then be :
1) Returned to the active mud system
2) Returned to the drill water tanks for use as dilution
3) Treated further to acceptable regulatory standards for release to the environment