Mechanical cementing packer collar.

A cementing tool, particularly a stage packer collar, has a tubular housing (12) with an inner passage (18) defined longitudinally therethrough and having a radially outer surface (20). The housing has a cementing port (22) and a longitudinal slot (26), both of which are disposed through a wall thereof. An outer closure sleeve (30) is slidably received about the outer surface (20) of the housing (12) and is movable relative to the housing between an open position wherein the cementing port is not covered by the closure sleeve and a closed position wherein the cementing port is closed by the closure sleeve. An inner operating sleeve (32) is slidably received in the inner passage of the housing and slidable between a first and second position relative to the housing. A mechanical interlocking means (36,38) extends through the slot (26) and is operably associated with both the operating sleeve (32) and the closure sleeve (30) for mechanically transferring a closing force from the operating sleeve to the closure sleeve and thereby moving the closure sleeve to its closed position as the operating sleeve moves from its first position to its second position. The cementing tool also includes packer element (150) for sealing the annular space below the cementing port between the casing and the borehole or between the casing and an outer string of casing. A means (155) is also provided for setting the packer element in order to seal the annular space. Internal components of the cementing tool may be drilled out of the housing after cementing operations are completed thus leaving a smooth bore through the cementing tool through which other equipment can be run.