Patent ID: 6508312
Filing Date: 2003-01-21
Classification: E21B

Abstract:
Apparatus for use down hole in a pipe string, when running pipe strings into a well, for management of surge pressure and the resulting fluid flow, the apparatus comprising:a) a body to function as a serial pipe string element, with means at each end to connect to continuing pipe string elements, having a generally central bore and first and second ports to conduct fluid through the apparatus wall; b) a removable flow inhibiting element, in said generally central bore situated to fluidly separate said first and second ports, removable by fluid down-flow in said generally central bore; c) a movable element in said generally central bore, responsive to downward flow of fluid in said generally central bore to close said second ports to outwardly directed flow; d) a check valve in said generally central opening arranged to cooperate with said first ports to resistively admit flow to said generally central bore and prohibit flow from said generally central bore through said first ports.