Hydraulic lock alleviation device, well cementing stage tool, an

Details Hydraulic lock alleviation device, well cementing stage tool, an Hydraulic lock alleviation device, well cementing stage tool, an

1988-02-05

1989-06-27

Neuder, William P.

Wells

Pistons, fluid driven into well

Surrounding conduit valve or closure opened by piston

166156, 166317, E21B 3316

Patent

active

048420620

ABSTRACT:
An hydraulic lock alleviation device a well cementing stage tool with such a device, and related methods for their use. The device has a channel for transmitting trapped fluid which causes a hydraulic lock from the trapped area to another area. The channel is blocked by a pressure responsive member which ruptures, moves, breaks, or is punctured to permit trapped fluid to glow from the area of hydraulic lock. In one embodiment of a stage tool with such a device, a puncture apparatus can be moved to puncture the pressure responsive member. In other embodiments, a movable piston or spool is mounted in the channel for movement to permit the flow of trapped fluid.

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Dowell Schlumberger, Cementing Technology, (1984), "Primary Placement Techniques", Chapter 10, pp. 1-20; Chapter 13, Cementing Equipment, pp. 11-12.
Halliburton Services Sales & Service Catalog 43, Composite Catalog, pp. 2440-2451, (1986-1987).
Weatherford Cementing Program, especially pp. 36-67, (1986).

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