Tool for treating subterranean wells
AssigneeDowell Schlumberger Incorporated
InventorsLaurent Muller, Ervin Randermann
Life of this patent
Estimating the term…
Abstract
A method and apparatus for treating subterranean wells includes a tool supported on a one-piece support tube which operates to raise and lower the tool in the well to a position where well treatment is required. The tool provides inflatable packers and a selector valve operable in a first position to inflate or deflate the packers, in a second position to circulate fluid to spot treatment fluid at the tool, and a third position for injecting treatment fluid into the strata isolated from the remainder of the well by the packers. The tool provides a J-lock system and a time delay dashpot which cooperate to permit an operator at the well head to selectively operate the valve between the three positions solely by adjusting the weight on the support tube at the well head.
Claims9
A system for treating subterranean wells comprising an elongated treatment tool having inflatable packers, a support tube connected to one end of said tool operable to lower said tool from a well head into a well and to supply liquid to said tool, said tool providing valve means operable in response to changes in tension in said tube and without rotating said tube to sequentially:
- (a) inflate said packers to isolate one portion of said well from the remaining portions thereof and to lock said tool against movement along said well;
- (b) inject treatment fluid supplied to said tool through said support tube into said one portion of said well;
- and
- (c) deflate said packers permitting further movement of said tool along said well.
A valve for tools used in subterranean wells, comprising first and second elongated tubular housing members connected for telescoping movement relative to each other between an extended position and a compressed position, piston means in one of said housing members movable relative thereto between a first position and a second position, said valve being open between the interior of said housing and the exterior thereof when said housing members are in said extended position and said piston means is in said first position, said valve being closed when said housing means are in said compressed position or said piston means is in said second position, said valve being connected to a treatment tool having inflatable packer means, said valve operating to deflate said packer means when said housing members are in said extended position and said piston means is in said first position.
A valve for tools used in subterranean wells, comprising first and second elongated tubular housing wells, comprising first and second elongated tubular housing members connected for telescoping movement relative to each other between an extended position and a compressed position, piston means in one of said housing members movable relative thereto between a first position and a second position, said valve being open between the interior of said housing and the exterior thereof when said housing members are in said extended position and said piston means is in said first position, said valve being closed when said housing means are in said compressed position or said piston means is in said second position, said housing members providing pressure balancing means preventing fluid pressure therein from moving said housing members to said extended position from said compressed position.
Dependencies are inferred from the claim text.