CNPC＇s drilling fluids sector, being one of the important components of the company＇s engineering service business, had experienced a golden development phase as the company continuously expanded its engineering service activities in the last decade. The development of drilling fluids had played a crucial role in fulfilling the company＇s goal of drilling more than 1000 wells （among which about 350 wells are UBD） and an annual drilling footage of 27 million meters.