Device and method for opening and stopping a toe valve
AssigneeGeodynamics, Inc.
InventorsDennis Roessler, John Hardesty, Kevin George
Life of this patent
Estimating the term…
Abstract
A downhole tool for connecting an interior of a casing to a formation, the downhole tool including an inner housing extending along a longitudinal axis X; an outer housing that encloses the inner housing and forms first to fourth chambers; a first piston that separates the first and second chambers; a second piston that separates the third and fourth chambers; a port that is configured to fluidly communicate an outside and inside of the downhole tool; and a stopping mechanism that prevents the second piston from opening the port. The second piston is positioned to separate the port into an outer portion and an inner portion to interrupt a fluid communication between the outside and inside of the downhole tool.
Claims23
A downhole tool for connecting an interior of a casing to a formation, the downhole tool comprising:
- an inner housing extending along a longitudinal axis X;
- an outer housing that encloses the inner housing and forms first to fourth chambers;
- a first piston that separates the first and second chambers;
- a second piston that separates the third and fourth chambers;
- a port that is configured to fluidly communicate an outside and inside of the downhole tool;
- a stopping mechanism that prevents the second piston from opening the port;
- and
- a first constrictor region formed between the second chamber and the third chamber, wherein the constrictor region is configured to allow a small content of a second fluid, present in the second chamber, to enter the third chamber, which is filled with air, and
- wherein the second piston is positioned to separate the port into an outer portion and an inner portion to interrupt a fluid communication between the outside and inside of the downhole tool.
A downhole tool for connecting an interior of a casing to a formation, the downhole tool comprising:
- an inner housing extending along a longitudinal axis X;
- an outer housing that encloses the inner housing;
- a piston that forms first and second chambers with the outer housing;
- a port that fluidly communicates an outside and inside of the downhole tool;
- and
- a stopping mechanism that prevents the piston from opening the port,
- wherein an inner part of the port is formed in the piston and an outer part of the port is formed in the outer housing and the piston is positioned to misalign the inner part and the outer part so that there is no fluid communication between an inside and outside of the downhole tool, and
- wherein the port extends only through the outer housing and the piston.
A method for connecting an interior of a casing to a formation with a downhole tool that is placed in a well, the method comprising:
- increasing a pressure of a fluid to break a burst disc formed into a piston of a tow valve, the piston being housed by an inner housing of the tow valve and an outer housing, wherein the inner housing forms with the outer housing, which encloses the inner housing, first and second chambers;
- moving the piston, which separates the first and second chambers, toward the second chamber;
- and
- blocking a movement of the piston with a stopping mechanism to prevent the piston from opening a port,
- wherein an inner part of the port is formed in the piston and an outer part of the port is formed in the outer housing and the piston is positioned to misalign the inner part and the outer part so that there is no fluid communication between an inside and outside of the downhole tool, and
- wherein the port extends only through the outer housing and the piston.
Dependencies are inferred from the claim text.