Viscosity result of drilling mud (base mud) represents the values of PV, AV, and YP as 6 cP, 14 cP, and 16 lb/100ft2, respectively. The viscosity result of drilling mud with low-acyl GLG concentration ranging of 0.1 to 0.5% at 30°C can be improved the performant of PV, AV, and YP when compare with base mud