Travelling disc valve apparatus

摘要

A travelling disc valve assembly, comprising a length of tubing lowered down a cased wellbore; a crossover tool secured to the lower end of the length of tubing; a length of wash pipe secured to the lower end of the crossover tool; a disc valve assembly secured to the wash pipe and positioned to a lower circulation position in the well bore; a disc valve secured in a bore of the assembly; in the upper portion of the assembly for shearing off the connection between the wash pipe and the disc valve assembly, when the disc valve assembly is in an upper position, providing to prevent fluid from flowing into the formation below the disc valve and to prevent production flow to the surface; and a to rupture the disc valve at a predetermined time so that the production within the formation is allowed to flow through the assembly bore to the surface.