The environmental friendliness of fuzzy-ball drilling fluids during their entire life-cycles for fragile ecosystems in coalbed methane well plants.

To protect the vulnerable ecosystems in coalbed methane(CBM) well plants from the pollution of drilling fluids, the environmental friendliness of fuzzy-ball drilling fluids was evaluated. Further, the combination of solidification and in-situ landfill were proposed to optimize their waste disposal. Firstly, the samples for tests were collected from the well plants.