▎ 摘　　要

NOVELTY - The fluid treatment system has a membrane unit (100) that comprises an inlet for receiving a fluid stream into the membrane unit. A first membrane comprises a porous substrate is partially coated with graphene oxide when the first membrane separates a first portion of the fluid stream from a second portion of the fluid stream. The first portion of the fluid stream comprises water. A first outlet (138) is provided on a first side of the first membrane. A second outlet (142) is provided on a second side of the first membrane opposite the first side. USE - Fluid treatment system for treating completion fluid, fracturing fluid and slop water. ADVANTAGE - The system treats the recovered fluid so that it is reused, recycled, or mounted of with minimal cost. The system reuses the brine from recovered completion fluids, thus, minimizing the cost of the brine used during completion operations. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for treating used fluid recovered from well. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional schematic view of a membrane unit. Membrane unit (100) Graphene oxide coated membrane (102) First outlet (138) Radially inner side (140) Second outlet (142)