Multi-well blending system

A blending unit comprising:

• a first discharge pump having a suction inlet fluidly connected to a blender tub via a concentrated proppant inlet line, a discharge outlet fluidly connected to a blender outlet line, and (i) an injection port upstream of the first discharge pump and configured to inject substantially proppant-free fluid into the concentrated proppant inlet line, (ii) an injection port downstream from the first discharge pump and configured to inject substantially proppant-free fluid into the blender outlet line, or (iii) both the injection port upstream of the first discharge pump and the injection port downstream from the first discharge pump;
• a first substantially proppant-free supply pump having a suction inlet fluidly connected to a substantially proppant-free fluid supply source and a discharge outlet fluidly connected to (i) the blender tub, (ii) the injection port upstream of the first discharge pump, (iii) the injection port downstream from the first discharge pump, or (iv) any combination of the blender tub, the injection port upstream of the first discharge pump, or the injection port downstream downstream from the first discharge pump;
• and
• a second substantially proppant-free supply pump having a suction inlet fluidly connected to the substantially proppant-free fluid supply source and a discharge outlet fluidly connected to (i) the blender tub, (ii) the injection port upstream of the first discharge pump, (iii) the injection port downstream from the first discharge pump, or (iv) any combination of the blender tub, the injection port upstream of the first discharge pump, or the injection port downstream from the first discharge pump.