between the expandable tubular 20 and the surrounding wellbore when the expandable tubular 20 is expanded the expansion system 10 has a gauge diameter 24 that is defined by the largest outside diameter of system which may be maximum outside diameter of i the housing 12 ii the sealing members 22 iii the expandable tubular 20 if not equipped with sealing members 22 or iv the expansion sleeve 18 the housing 12 includes a housing wall 26 having an upper end 28 and a lower end 30 the upper end 28 is configured to be coupled to a drill string not shown or to some other support member such as tubing or wireline as well as provide fluid communication with a supply of hydraulic fluid through housing inlet 32 the housing wall 26 includes fluid ports 34 that provide fluid communication across the housing wall 26 the expansion piston 14 is disposed within the housing 12 and includes an elongate body 36 having a bore 38 a piston end 40 and an expansion cone 42 the piston end 40 may include a ball seat 41 and one or more sealing members 44 that sealingly engage the housing wall 26 the expansion cone 42 includes a profiled surface 46.