The product is manufactured by special processing treatment of several surfactants and cationic shale inhibition agent as well as asphalt with specific range of softening point. The micron-grade asphalt particles with positive electron are easily attached with solid particles with negative electron, together participating in the forming of mud cake, to improve quality of mud cake. The micron particles and cationic shale inhibition agent can penetrate into bore fracture to create absorption as well as convergence, playing the function of plugging, bridging and anti-swelling, preventing collapse, reducing water loss as well as protecting oil/gas zone. 

The product is suitable for all water based drilling fluid system The product is applicable for all types of development wells, excluding exploration wells.