Patent ID: 8783351
Filing Date: 2014-07-22
Classification: E21B

Abstract:
1. A cementing tool configured for attachment to a casing string and operable to direct a fluid flowing within said casing string into an annulus defined between said casing string and a downhole formation, said tool comprising: a tubular body comprising a cylindrical sidewall having an interior surface and an exterior surface, said sidewall interior surface defining a central passage; at least one channel-forming member defining a channel that is located outboard from said central passage and has a longitudinal central axis different from that of said central passage, said channel having at least one open end comprising an opening that is longitudinal central axis transverse to said channel permitting communication between said channel and annulus when said tool is interposed between adjacent sections of casing string; at least one port formed in said sidewall that defines a path for fluid flow between said central passage and said channel; and at least one rupture disc assembly comprising a rupture disc, said rupture disc when in an unruptured state being disposed in fluid blocking relationship between said central passage and said at least one open end.