This paper introduces the application of new technology on water-base semipermeable membrane drilling fluid in Sebei Natural Gas Field. Experiments relating to low rate of mud yielding, rate of recovery for drilling cuttings and antipollution, etc. have been evaluated the performances of this drilling fluid, indicating a high semipermeable membrane performance, strong inhibition of shale aquation, expansion and dispersancy, good resistance of pollution by cuttings and high-temperature rheological behavior. In Sebei Natural Gas Field, the application of the drilling fluid shows the good performances as above said as well as prevention of borehole collapse, low wellbore expansion rate and borehole is regular.

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