Abstract: With the development of drilling and completion technology，developing bottom-water drive reservoir with inflow
control device（ICD）completion technique in horizontal well is efficient for increasing the yield and reducing the cost. Understanding
the mechanism and influencing factors of controlling bottom water in horizontal well with ICD is crucial to delay
the bottom water coning and improve the ultimate recovery with inflow control device technology. Based on the mechanism
analysis of ICD characterization for bottom water coning control and flowing restraint，this paper has simulated and studied the
3 main influencing factors on ICD’s water control effect，namely，the flowing profile，annulus flow and water ratio. The results
show that：First，in reservoir without high water ratio section，ICD can be used to increase the hypertonic segment resistance
and water is controlled at the expense of total liquid production. Second，the additional pressure drop generated by ICD can
effectively reduce annulus flow and increase the stability of ICD water control to ensure long-term stable production and water
control. Third，misunderstanding of the reservoir properties will greatly affect ICD’s water control effect. Fourth，in horizontal
well with high water ratio section，the effective water control can be realized by increasing the additional pressure drop and
lower the liquid production of the section. This study of ICD’s water control mechanism and influencing factors in horizontal
well can provide technical clue for optimizing ICD completion.

Key words: bottom water coning, inflow control device, mechanism for controlling bottom water, horizontal well, bottomwater reservoir