Wells – Packers or plugs – Expanded by confined fluid from central chamber – pump or...
Patent
1974-11-18
1976-03-02
Purser, Ernest R.
Wells
Packers or plugs
Expanded by confined fluid from central chamber, pump or...
166188, 166224A, 175230, 175317, 277 346, E21B 33127
Patent
active
039411907
ABSTRACT:
A tool for running on a well string such as a drill string in a well bore carries inflatable packer means to close off the well bore adjacent the tool. The tool includes a body having a longitudinal bore therethrough with seating means and shock absorbing means for absorbing the shock of seating a bore close off means to close off the bore in the drill string. The bore close off means includes latch means for latching the bore close off means in seated position in the well string.
The tool may be positioned in the drill string near the drilling bit and when pressure is applied in the well string at the earth's surface such pressure is conducted through the bore close off means to inflate the inflatable packer means and seal off the well bore beneath the inflated packer means.
The bore close off means includes valve means for selectively controlling flow through the bore close off means, or for preventing flow through the bore close off means, as well as shiftable valve means which enables well bore pressure to be equalized above and below the packer means during deflation of the inflatable packer means.
The tool also includes port means normally closed off by shiftable valve means which may open for circulating fluid in the well bore above the inflated packer means when desired.
The tool also includes valve means responsive to the pressure differential between the drill string and the well bore above the inflatable packer means to sequentially inflate the inflatable packer means when the bore close off means is seated in the well string and to sequentially equalize the pressure above and below the packer means and deflate the packer means.
REFERENCES:
patent: 2994378 (1961-08-01), Reistle, Jr.
patent: 3529665 (1970-09-01), Malone
patent: 3606924 (1971-09-01), Malone
Hayden Jack W.
Lynes, Inc.
Purser Ernest R.
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