Floating screen pipe assembly for extended reach horizontal well

The invention discloses a floating screen pipe assembly for an extended reach horizontal well. The floating screen pipe assembly comprises a screen pipe floating coupling, a floating screen pipe and afloat shoe. The screen pipe floating coupling comprises an outer cylinder, upper shear pins, upper outer protective pins, a sealing steel ring, a V-shaped sealing packing, an adjusting ring, an innersleeve, fixed sleeve lower shear pins, lower outer protective pins and a plug. The screen pipe can be isolated from a certain position during the tripping in of the screen pipe. After the tripping inof the screen pipe into place, the inner sleeve can be pressurized to cut the screen pipe and drop the same into the upper part of the float shoe. When the screen pipe enters the well, the screen pipe can be ensured to be sealed completely so as to achieve floating tripping in. At the time of extended reach well completion, the screen pipe moves downwards closely along the bottom edge of the wellbore of the horizontal well