| http://www.w3.org/ns/prov#value | - Pump pressure within the flow bore may thereafter be increased to open the rapture disc in the egress valve 35. [0042] The ingress valve rupture disc 67 may also be opened at this time and the collar annulus 20 proceed to receive cement. [0043] As the collar annulus fills with cement from the egress valve 35, downhole formation fluids, drilling fluids and other debris is forced from the collar ann
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