| 摘要 |
A telescoping joint for use in a conduit connected to a wellhead and supporting downhole well tools to permit the downhole well tools to be axially displaced in the well bore without disconnecting the conduit from the wellhead is described. The telescoping joint is particularly useful in conjunction with an apparatus for providing an axially displaceable isolated fluid zone in a cased well bore, which is also described. The telescoping joint and the apparatus are used in conjunction for producing a predominance of a fluid of interest from a cased well bore which passes through a production zone that yields at least two fluids having different densities. The telescoping joint may also be used in conjunction with other downhole tools for performing a plurality of downhole operations which require axial displacement of the tools in the well bore without disconnection of the conduit from the wellhead. The advantage is the ability to move downhole well tools supported by a conduit such as a production tubing up or down in the well bore without disconnecting the production tubing from the wellhead or removing or adding sections to the tubing string. This permits many downhole operations to be much more economically and quickly accomplished including the selective production of oil or gas from water-bearing formations.
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