Vent assembly

Details Vent assembly Vent assembly

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) E21B 34/14 (2006.01)

Patent

CA 1090699

IMPROVED VENT ASSEMBLY ABSTRACT OF THE INVENTION A vent assembly for use in a tubing string located down- hole in a borehole. The vent assembly is moved to the open posi- tion by a fishing tool attached to a slick line and run downhole through the tubing string into engagement therewith. The vent assembly includes an elongated, annular piston which slidably and sealingly engages the inside peripheral wall of a housing. The housing has radial ports which are covered by spaced seals located on the annular piston. One of the seals is larger in diameter than the other, thereby presenting different surface areas to the bottomhole fluids of the borehole within which the assembly is located. A sliding valve element underlies the annular piston and covers a relatively small bleed port so that when the valve element is moved by the wireline actuated tool to uncover the bleed port, the pressure differential across the housing is equal- ized. The sliding valve element is engaged by the wireline fish- ing tool and oved uphole to uncover the bleed port and thereafter, moved further uphole to open the vent port. - 1 -

312431

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