Cementing collar and method of operation

Details Cementing collar and method of operation Cementing collar and method of operation

1979-11-13

1981-04-07

Leppink, James A.

Wells

Pistons, fluid driven into well

Surrounding conduit valve or closure opened by piston

166289, 166318, E21B 3314, E21B 3316, E21B 3414

Patent

active

042600170

ABSTRACT:
The cementing collar described herein is designed primarily for cementing operations in oil or gas wells. The basic assembly includes a collar, an outer sleeve slidable in the collar, and an inner sleeve slidable in the outer sleeve. The collar and outer sleeve each have cementing ports therein. When the assembly is being run into the well casing, the collar and both sleeves are secured by shear pins in a position such that the cementing ports are closed. To open the cementing ports a trip bomb is dropped into the casing to engage a seat inside the outer sleeve. This causes the pins to shear and permits the outer sleeve to move down to a position in which the sleeve ports line up with the collar port. After cementing has been completed, a plug is flowed down the casing to engage the inner sleeve. Fluid pressure is applied behind the plug to shear the pins a second time. This moves the outer sleeve further down to a position in which the cementing ports are again closed.

REFERENCES:
patent: 2249511 (1941-07-01), Westall
patent: 3131767 (1964-05-01), Chancellor et al.
patent: 3464493 (1969-09-01), Chancellor et al.
patent: 3633671 (1972-01-01), Nelson
patent: 3789926 (1974-02-01), Henley et al.
patent: 4176717 (1979-12-01), Hix

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