Wells – Conduit wall or specific conduit end structure – Flexible tube or cable
Reexamination Certificate
1999-02-25
2001-04-10
Bagnell, David (Department: 3672)
Wells
Conduit wall or specific conduit end structure
Flexible tube or cable
C175S067000, C175S073000
Reexamination Certificate
active
06213205
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention generally relates to tools used in the exploration and production of oil and gas, and relates more particularly to downhole well tools capable of being bent, or deflected, to a pre-selected angle with respect to a longitudinal reference line upon internal pressurization of the tool to achieve or enhance certain downhole operations.
BRIEF SUMMARY OF THE INVENTION
A pressure a activated bendable tool assembly having a longitudinal centerline, the tool assembly comprising an adapter sub for connectedly adapting the tool assembly to an end of a tubular member, the adapter sub having a bore extending longitudinally therethrough and having a means for providing a fluid connection between the tubular member and the tool assembly. A first bend element having a bore extending longitudinally therethrough, the bore being in fluid communication with the bore of the adapter sub. A second additional bend element having a bore extending therethrough for accommodating a portion of a bend element positioned longitudinally proximate to the second additional bend element. At least one retainer sleeve for axially retaining the first and second bend elements, the retainer sleeve further having a means for limiting the amount the first and second bend elements may be longitudinally displaced from each other about a preselected side of the retainer sleeve element. A head-sub means for forming a distal end of the tool assembly opposite of the adapter sub. Wherein the tool assembly bends with respect to the longitudinal centerline a preselected amount upon inducing a pressure differential between the respective bores of the adapter sub, the bend elements, and the head-sub and the ambient pressure of the tool assembly.
A preselected number of bending elements and retainer sleeves may be installed to achieve the desired total amount of arc in which the tool is to bend upon being pressurized.
The head-sub may be replaced with a jetting sub containing a jet nozzle for performing jetting operations. The subject tool assembly is particularly suitable for use in carrying out jetting operations or entry operations in multilateral wellbores or horizontal wellbores when connected to coiled tubing or composite coiled tubing.
Preferably the bend elements have external shoulders which coact with internal tangs on the sleeve retainers to axially restrain the bending elements along a preselected side to cause the bend elements to form an arc about the longitudinal axis of the tool assembly upon being pressurized. Preferably the shoulders have notches therein to allow the tangs of the retainer sleeves to slip about the bending elements and to be rotatably positioned thereabout.
Preferably set screws or other lock means are provided for non-bindingly securing the retainers about their respective bend elements, and adaptor and head sub if appicable, to prevent the retainer sleeves from rotating out of position by engaging the slots in the shoulders of the bending elements.
REFERENCES:
patent: 3743034 (1973-07-01), Bradley
patent: 4895214 (1990-01-01), Schoeffler
patent: 4928776 (1990-05-01), Falgout, Sr.
patent: 5029654 (1991-07-01), Wilson et al.
patent: 5259467 (1993-11-01), Schoeffler
patent: 5269385 (1993-12-01), Sihlis
patent: 5343966 (1994-09-01), Wenzel et al.
patent: 5503235 (1996-04-01), Falgout, Sr.
patent: 5669457 (1997-09-01), Sabastian et al.
patent: 2 324 818 (1998-11-01), None
Bagnell David
Christian Stephen R.
Dawelbeit Kamal
Halliburton Energy Service,s Inc.
Kent Robert A.
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