Method and apparatus for sealing an annulus of a wellbore

摘要

A well system (100) includes a production string (130) adapted to extend from a wellhead (120) to a subterranean zone (110). The production string (130) includes one or more joints of tubing comprising a bore; a seal (150) actuable by a specified pressure in the bore to substantially prevent fluid communication in an annulus (140) between a first portion of a wellbore (115) and a second portion of the wellbore (115), and an intervention sub (200) comprising a body (210) and a plurality of ports (228, 230) adapted to allow fluid communication between the bore and the annulus (140). The annulus is disposed between an exterior surface of the production string (130) and the wellbore (115). The intervention sub (200) further includes a seat (226) adapted to receive a plug (224) from the terranean surface (105) and seal the bore to substantially prevent fluid communication through the ports (228, 230).

主权项

1. A well system comprising:
a production string adapted to extend from a wellhead to a subterranean zone, the production string comprising:
one or more joints of tubing comprising a bore;a seal actuable by a specified pressure in the bore to substantially prevent fluid communication in an annulus between a first portion of a wellbore and a second portion of the wellbore, the annulus disposed between an exterior surface of the production string and a wellbore; andan intervention sub comprising:
a body comprising a first portion of a plurality of ports;a sleeve comprising a second portion of the plurality of ports, the first and second portions of the plurality of ports allowing fluid communication between the bore and the annulus when aligned; anda seat assembly releasably secured to the sleeve, the seat assembly comprising a collet and a seat, the seat adapted to receive a plug from the terranean surface and seal the bore to substantially prevent fluid communication through the ports and a profile adapted to be engaged by a downhole tool, the seat assembly retrievable to the terranean surface through the bore by the downhole tool engaged with the profile, the collet engagable by a portion of the downhole tool to expose one or more pressure equalizing ports disposed through the seat assembly to substantially equalize pressure in regions uphole and downhole of the seat.