At present

the leakage of shale gas drilling is quite common in China

and there are few plugging methods suitable for oil-based drilling fluid.The total loss of drilling fluid is still a difficult problem for technicians in the industry.Taking the field operation of Well-WY-1HF as an example

during the drilling of its horizontal well interval by using oil-based drilling fluid

the conventional plugging technology of bridge plug and cement plugging technology of oil "well can not work efficiently.Based on the analysis of the characteristics of the loss zones

the effect of different plugging material of oil-base drilli

ng fluid performance have been studied to determine the formula for successful plugging

that is high density（1.89 g/cm

3

） cement solidified plugging combined with low density（1.17 g/cm

3

） inorganic gel curing plugging

cooperating with the use of bridge plug with high concentration and large particle.It ensures the subsequent drifting

well logging

the casing and cementing operation smoothly.The successful implementation of this method provides certain reference for the application of shale gas plugging technology in the same area.