Wells – Processes – Placing or shifting well part
Reexamination Certificate
1999-10-02
2001-07-10
Tsay, Frank (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S123000
Reexamination Certificate
active
06257339
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related, among other things, to wellbore packer systems and, in certain aspects, a tension-set packer run on coil tubing. In other aspects, a set-down disconnect is used with such a system.
2. Description of Related Art
Coil tubing cannot be rotated. Certain prior art down-hole tools that require rotation cannot be used with coil tubing. Consequently, hydraulically set packers are used with coil tubing. Coil tubing can be reciprocated. One prior art patent, U.S. Pat. No. 5,095,979 provides apparatus that operates in well production tubing by reciprocating the coil tubing. The apparatus has a pin moving in a groove that allows a packer to be run into production tubing, set, and released by the longitudinal movement of no coil tubing only.
In certain prior art wellbore operations in which fluid with solids is being pumped into the wellbore (e.g. sand, proppant, or other solids), a ball actuated disconnect may be ineffective. In such situations a disconnect is needed which does not rely on the dropping of a ball.
There has long been a need for an effective and efficient wellbore packer system which can be run on coil tubing. There has long been a need for such a system with a tension-set packer. There has long been a need for an effective and efficient set-down disconnect.
SUMMARY OP THE PRESENT INVENTION
The present invention discloses, in certain embodiments, a wellbore system with a tubular string extending from an earth surface down into a wellbore in the earth, a packer system with a selectively settable packer element, and a disconnect located between an end of the tubular string and the packer system, the disconnect operable from the surface by imposing a downward force on the tubular string. In one aspect the packer system's packer element is a tension-set packer element. In one aspect the system includes selectively settable gripping apparatus for gripping an interior of a bore in which the wellbore system is located.
In certain aspects the wellbore system has selectively cycling apparatus for selective setting of the selectively settable gripping apparatus at a desired location in the wellbore. In one aspect the selective cycling apparatus permits setting of the wellbore system, subsequent un-setting of the wellbore system, relocation of the wellbore system within the wellbore, and re-setting of the wellbore system within the wellbore without retrieval of the wellbore system to the earth surface. In certain aspects, the wellbore system requires at least two up-down reciprocations of the tubular string to set the selectively settable gripping apparatus. The system may have an unloader and a check valve apparatus.
The present invention discloses a disconnect with a top sub, a piston having an upper end secured to the top sub and a portion below the upper end releasably secured with at least one releasable member to a carrier member, the carrier member having apparatus for selectively gripping the piston (e.g. one or more lugs, one or more collet fingers, or a collet gripping end), the apparatus for selectively gripping the piston also selectively gripping a bottom sub within which the piston is movable, the at least one releasable member releasable in response to a downward force on the disconnect.
The present invention discloses a wellbore centralizer with two carriers each with a generally cylindrical hollow body having a bore therethrough from a top to a bottom thereof, a plurality of spaced apart recesses in an exterior of each generally cylindrical hollow body, a plurality of spaced apart bow springs each with two ends, each end within and corresponding in shape to a shape of the plurality of spaced-apart recesses, and an outer sleeve secured to each generally cylindrical hollow body and releasably holding the spring ends within the plurality of spaced-apart recesses.
It is, therefore, an object of at least certain preferred embodiments of the present invention to provide:
New, useful, unique, efficient, nonobvious wellbore packer systems;
Such systems with a tension-set packer run on coil tubing;
Such systems with a set-down disconnect;
Such systems useful in a variety of wellbore operations, including, but not limited to, formation fracturing operations; and
New, useful, unique, efficient, nonobvious set-down disconnects.
Certain embodiments of this invention are not limited to any particular individual feature disclosed here, but include combinations of them distinguished from the prior art in their structures and functions. Features of the invention have been broadly described so that the detailed descriptions that follow may be better understood, and in order that the contributions of this invention to the arts may be better appreciated. There are, of course, additional aspects of the invention described below and which may be included in the subject matter of the claims to this invention. Those skilled in the art who have the benefit of this invention, its teachings, and suggestions will appreciate that the conceptions of this disclosure may be used as a creative basis for designing other structures, methods and systems for carrying out and practicing the present invention. The claims of this invention are to be read to include any legally equivalent devices or methods which do not depart from the spirit and scope of the present invention.
The present invention recognizes and addresses the previously-mentioned problems and long-felt needs and provides a solution to those problems and a satisfactory meeting of those needs in its various possible embodiments and equivalents thereof. To one skilled in this art who has the benefits of this invention's realizations, teachings, disclosures, and suggestions, other purposes and advantages will be appreciated from the following description of preferred embodiments, given for the purpose of disclosure, when taken in conjunction with the accompanying drawings. The detail in these descriptions is not intended to thwart this patent's object to claim this invention no matter how others may later disguise it by variations in form or additions of further improvements.
DESCRIPTION OF THE DRAWINGS
A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or legally equivalent embodiments.
FIG. 1
is a side cross-section view of a system according to the present invention.
FIGS. 1A-1F
are enlargements of portions of the system of FIG.
1
.
FIG. 1G
is a cross-section view along line
1
G—
1
G of
FIGS. 1 and 1B
.
FIG. 1H
is a flattened view of a portion of the system of FIG.
1
.
FIGS. 2A-2D
are side cross-section views showing various steps in an operation of the system of FIG.
1
.
FIGS. 3A-3F
illustrate movement of a lower body of the system of FIG.
1
and corresponding carrier pin and bearing segment positions.
FIG. 4A
is a front view of a drag spring according to the present invention.
FIG. 4B
is a side view of the drag spring of FIG.
4
A.
FIG. 5A
is a side view of a drag spring carrier according to the present invention.
FIG. 5B
is a cross-section view of the carrier of FIG.
5
A.
FIG. 5C
is a cross-section view along line
5
C—
5
C of FIG.
5
A.
FIG. 5D
is a cross-section view along line
5
D—
5
D of FIG.
5
A.
FIG. 5E
is a side view of a centralizer according to the present invention.
FIG. 6
is a side schematic view of a system according to the present invention.
FIGS. 7A and 7B
are side cross-section views of a disconnect according to the present invention.
REFERENCES:
patent: 2893491 (1959-07-01), Crowe
patent: 3282343 (1966-11-01), Tausch
patent: 3344861 (1967-10-01), Claycomb
patent: 3516703 (1970-06-01), Templeton
patent: 3548936 (1970-12-01), Kilgore
patent: 3575238 (1971-04-01), Shillander
patent: 3603392 (
Beeman Robert Stephen
Haugen David Michael
Hoffman Corey Eugene
Ingram Gary Duron
McClung Guy
Tsay Frank
Weatherford Lamb, Inc
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