External sleeve cementing tool

A downhole cementing tool (10) includes a tubular housing (12) having an inner passage (18) defined longitudinally therethrough and having a radially outer surface (20). The housing also has a cementing port (22) and a longitudinal slot (26,28) both disposed through a wall thereof. An outer closure...

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Bibliographic Details
Main Authors GIROUX; RICHARD L, BRANDELL; JOHN T
Format Patent
LanguageEnglish
Published 13.08.1991
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A downhole cementing tool (10) includes a tubular housing (12) having an inner passage (18) defined longitudinally therethrough and having a radially outer surface (20). The housing also has a cementing port (22) and a longitudinal slot (26,28) both disposed through a wall thereof. An outer closure sleeve (30) is slidably received about the outer surface of the housing and is movable relative to the housing between an open position wherein the cementing port is uncovered 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 housing and slidable between first and second positions relative to the housing. à pin (36,38) extends radially through the slot and fixedly connects the operating sleeve and the closure sleeve together for common longitudinal movement relative to the housing. When cementing is completed, a cementing plug engages the operating sleeve and causes it to move the external closure sleeve downward thus closing the cementing port. Internal components of the cementing tool may then be drilled out of the housing thus leaving a smooth bore through the cementing tool through which other equipment can be run.
Bibliography:Application Number: US19900515883