Forming a wellbore casing

An apparatus for forming a wellbore casing within a borehole comprises a first tubular support member 12 defining a first fluid passage 12a and a radial passage 14g having a rupture disc 36 fluidically coupled to the first fluid passage 12a; an annular expansion cone 18 coupled to the first tubular support member 12a; an expandable tubular member 20 movably coupled to the expansion cone 18; a shoe 54 defining a second fluid passage 54a coupled to the expandable tubular member 20; an annular valve member 44 defining a third fluid passage 44a fluidically coupled to the first 12a and second 54a fluid passages having first and second throat passages 44aa,44ab, defining second and third radial passages 44da,db,ea and eb fluidically coupled to the third fluid passage 44a, coupled to the shoe 54, and movably coupled to the first tubular support member 12; and an annular sleeve 42 releasably coupled to the first tubular support member 12 and movably coupled to the annular valve member 44 for controllably fluidically coupling the second and third radial passages 44da,db,ea and eb; and wherein an annular region is defined by the region between the tubular member and the first annular support member, the second annular support member, the annular valve member, and the annular sleeve.