Cementing staging tool

Details Cementing staging tool Cementing staging tool

1976-08-16

1978-08-08

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

Destructible element

166330, 166334, E21B 3314

Patent

active

041050746

ABSTRACT:
A cementing staging tool for use downhole in a borehole which is interposed in a casing string and manipulated by longitudinal and rotational movement of the upper casing string. The tool enables cement to be pumped down through the string of casing to form a lower plug. The upper casing string is then rotated and thereafter lowered to thereby open a lateral flow passageway through which cement can be pumped. The cement flows through the tool and fills the borehole annulus, thereby cementing the casing string to the borehole wall. The tool is closed by lowering the upper marginal length of the casing string.
The tool maintains the ends of the casing string in captured relationship respective to one another at all times, and is left downhole as a permanent part of the casing string after the cementing operation has been completed.

REFERENCES:
patent: 2675875 (1954-04-01), Potts
patent: 3233677 (1966-02-01), Myers
patent: 3661207 (1972-05-01), Current et al.
patent: 3736984 (1973-06-01), Garrett

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