E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/9
E21B 23/04 (2006.01) E21B 23/02 (2006.01) E21B 33/129 (2006.01) E21B 43/04 (2006.01) E21B 43/10 (2006.01)
Patent
CA 1259906
ABSTRACT The present invention comprises a method and apparatus especially suitable for hydraulically releasing from a screen on a circulation-type gravel pack job. The releasing tool of the present invention comprises a tubular case by which the tool is secured to a gravel packer thereabove, and a gravel screen is secured thereto therebelow, the case having disposed within a collet sleeve assembly shouldering on the top of the case and including a plurality of collets extending downwardly into the case, the collets being radially outwardly biased into engagement with the case by the lower end of a releasing mandrel disposed within the collet sleeve. A ball seat at the top of an axial bore extending through the releasing mandrel permits the seating of a ball and downward movement of the releasing mandrel inside the collet sleeve, removing the outward bias against the collets and permitting withdrawal of the collet sleeve and releasing mandrel from the case and attached screen therebelow. Reversing ports may be incorporated in the wall of the upper collet sleeve, to be uncovered when release mandrel moves downward therein, to positively identify release from the screen and to permit displacement of gravel slurry from the tubing string and annulus above the releasing tool with a clean fluid prior to removal of the string from the well bore. A reversing boot may be employed about collet sleeve proximate reversing ports therein, to pre- vent back flow in the tool. The general method employing the aforesaid tool briefly comprises transmitting pressure down to the ball seat in the releasing tool with a ball disposed above the seat; moving the releasing mandrel down, thus disengaging the collets from the tool case and pulling the collet sleeve and releasing mandrel out of the tool case, leaving the gravel screen and attached tool case in the wellbore.
514051
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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