Wells – Conduit wall or specific conduit end structure – Plural – parallel – nonconcentric conduits
Reexamination Certificate
1999-06-18
2001-04-24
Neuder, William (Department: 3672)
Wells
Conduit wall or specific conduit end structure
Plural, parallel, nonconcentric conduits
C166S189000
Reexamination Certificate
active
06220351
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to equipment such as production pipes, auxiliary conduits, and the like as used in hydrocarbon extraction wells for performing the necessary electric, hydraulic, and mechanical operations in the well, and is particularly concerned with a sliding link or connector apparatus for use in lowering an auxiliary conduit or the like alongside a production pipe.
U.S. Pat. No. 3,907,355 describes a tubing retrieval mechanism for use in a well. The mechanism engages slidably over an existing tubing string which acts as a guide for a tubing retrieval spear as it is lowered into the well. The mechanism comprises an elongate retrieval element which generally conforms to the internal dimensions and shape of the well casing, and which has two guide passageways, one of which is shaped and dimensioned for sliding engagement over an existing tubing string, and the other being dimensioned for close fitting over a separate tubular string. This system is not readily adaptable to well casings of different sizes and shapes, and may be difficult to maneuver.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and improved sliding connection apparatus for a hydrocarbon extraction well.
According to the present invention, a sliding connection apparatus for a well is provided, which comprises a body having an outer shape and dimensions which do not conform to the shape and dimensions of a well casing, and which fits readily inside the well casing, the body having a first through bore for sliding engagement over a first tubular element positioned in the well casing, and a second through bore for securing over a second tubular element to be lowered into the well.
The body has a width greater than its length in an exemplary embodiment, and has a first part-cylindrical portion containing the first through bore, a second part-cylindrical portion containing the second through bore, and a connecting portion extending between the first and second portions.
The sliding connection apparatus or link is smaller and lighter than previous sliding links as used in similar applications, and may be used in well casings of different dimensions, since it is not a close sliding fit in the casing, unlike prior art arrangements. It is more economical as well as more readily maneuverable than previous systems.
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Brown Martin Haller & McClain LLP
Neuder William
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