Junebug, Cattleyas never bloom a second time from the same psuedobulb. Sometimes they do stay green for a while after blooming but, as far as I know, they serve no purpose after that. If it's during the rainy season I cut them off just as you did.
Thanks for the clarification. I was pretty certain they didn't.
There is one time I can think of where you would remove an unbloomed sheath: When you do not want the flower to be produced
If your plant has recently been stressed with infection or is having a rough time establishing after a repot, removing the sheath(s) will enable the plant to abandon flowering and put more energy into roots etc.