Horizontal well steam injection method and system

The present invention discloses a horizontal steam injection well system and method, wherein the method comprises: a fluid flow pattern of horizontal steam injection wells, horizontal well trajectory, and a horizontal steam injection wells segments of steam injection and steam injection hole area analysis; sectional analysis results and the test well temperature curve, determine the horizontal steam injection wells in each column position of the valve steam injection, steam injection and steam injection aperture; according to the determined position, the amount of steam injection and steam injection aperture, in the horizontal steam injection wells are provided for each column of steam injection valves and steam injection wells using the horizontal string horizontal steam injection wells. The present invention can solve the prior art, since the long horizontal section, the horizontal section of steam injection uniform, and horizontal well completions screen, steam injection process difficult problem embodiment can be achieved even horizontal steam injection wells, thereby improving the fused Hirai extent of water use.