E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/59
E21B 23/03 (2006.01)
Patent
CA 1163554
ABSTRACT OF THE DISCLOSURE A well tool is disclosed for shifting the sleeve of a port collar in a well casing, to open and close the ports in the collar. The tool is made up of a housing having a double piston assembly mounted slide- ably in a transverse bore in the housing. The trans- verse bore is intersected by a lengthwise bore in the housing. Fluid is carried into the housing from a tubing string connected to the lengthwise bore. The double piston assembly has an outer face in contact with fluid in the well casing, and a smaller area inner face in contact with fluid inside the housing bore. This differential in the piston surface area holds the piston assembly in a "retract" position by the fluid pressure on the outer face. Alternatively, the piston assembly can be moved laterally to engage the port collar sleeve by applying a differentially higher fluid pressure to the inner face. Pulling the tubing string upwardly shifts the sleeve to a position which opens the collar ports. Setting weight on the tubing string moves the sleeve downwardly to close the collar ports. 28,230-F
390595
Mclaurin Charles H.
Nelson Wayne F.
Smart & Biggar
The Dow Chemical Company
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