Safe drilling method for deepwater narrow pressure window well

The invention discloses a safe drilling method for a deepwater narrow pressure window well. The safe drilling method comprises the following steps of S1, preparation before drilling; S2, combination of drilling tools, wherein a measurement-while-drilling tool is installed at the position close to a drilling bit; S3, going-down, wherein the sensibility of the drilling speed pressure kick is analyzed, and an upper formation is subjected to pressure-bearing capacity testing, and when requirements are not met, the upper formation is subjected to leaking stoppage in advance first; S4, actual drilling, wherein good drilling fluid performance is maintained, solid control is strengthened, the annulus circulating pressure loss is reduced, the principle that after rotation, pumping is slowly startedat small displacement is adopted, and over-fast pumping is strictly forbidden; S5, redressing, wherein every time drilling is conducted one string, redressing is conducted two times; S6, pulling-out,wherein in the pulling-ou