Wells – Means for guiding insertable element laterally of well axis – Secured in operative position by movable means engaging well...
Patent
1997-12-29
2000-11-07
Bagnell, David
Wells
Means for guiding insertable element laterally of well axis
Secured in operative position by movable means engaging well...
166 50, 166382, E21B 706
Patent
active
061422258
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the field of oil well intervention. More particularly, the invention relates to a system of providing selective access to particular laterals for intervention wherein angle and orientation of the intervention string is ensured.
2. Prior Art
As one of skill in the art will undoubtedly appreciate one prior art method for intervening in a lateral was to simply measure the distance of pipe lowered into the hole. While this method has been used for many years, it has always been a difficult one because of the extreme distances involved. For example, where 100 feet of pipe is laid, a variance of two inches does not appear to be significant. This, however, is not the case when twenty thousand feet of pipe is contemplated. In keeping with the example, the two inches has become 400 feet. A distance off the mark of this magnitude can significantly hinder the working of the well. Therefore it is of interest to the industry to reduce variance to a minimum to maintain accuracy even at large depths.
It will be appreciated that spring loaded dogs are not new to the art and have been used for various purposes including positioning of tools however the combination of features that make the invention valuable have not before been contemplated.
SUMMARY OF THE INVENTION
The above-discussed and other drawbacks and deficiencies of the prior art are overcome or alleviated by the monobore diverter system of the invention.
The invention is a system comprising three distinct sections including: 1) an orientation device to align a guide stock angularly with a bore of a packer; 2) an adjustment sub adjustable prior to running the assembly which ensures the desired angular position of the guide stock relative to the alignment sub of the packer; and 3), if a six inch bore is desired, a centralization sub to provide centralization of the guide stock within the well bore. Where there is no requirement for a six inch bore the centralization sub is not necessary and only a spacer long enough to retain the top of the guide stock in the tail pipe of the packer will be necessary.
With respect to the orientation device, the device and system of the invention further comprise a collapsible key and a series of selectively profiled dogs. As will be apparent to one of skill in the art from a review of the drawings hereof, the key is picked up in a helical slot to rotate the device of the invention to the desired and predetermined orientation while the dogs engage a profile complimentary thereto to prevent further downhole movement of the device. Because of the selective profile, the device of the invention can be essentially, coded to seek out the correct packer by skipping over any nonconforming packers. It is important to note that the original deployment of packers must consider the likelihood of the dogs engaging the incorrect packer due to a larger profile than the dogs. Packer profiles should be set accordingly to avoid the problem. The key of the device, when it reaches the intended packer picks up on a helical slot in the packer and begins to spin the arrangement into the orientation desired. The helical slot ends with an alignment profile in the packer. Therefore, because the device of the invention provides a known orientation between the orientation sub and the guide stock, it is certain that the intervention string will penetrate the lateral as intended. When the dogs pick up on the selective profile downhole movement is halted and the dogs are locked in placed by a moveable internal mandrel. Where access to the bore of six inches is required, a centralization device is employed which comprises a set of arms normally held into the body of the tool by a reverse angled section constructed to facilitate such holding. The arms are not released until a shear pin is overcome. A garter spring is provided to assist in pulling the arms back to a position in which they are retained by the reverse angled section subsequent to being disengaged from the borehole. The
REFERENCES:
patent: 4807704 (1989-02-01), Hsu et al.
patent: 5311936 (1994-05-01), McNair et al.
patent: 5467819 (1995-11-01), Braddick
patent: 5474131 (1995-12-01), Jordan, Jr. et al.
patent: 5915474 (1999-06-01), Buytaert et al.
Cameron David
Forsyth David George
McCorry Mark
Smith Robert C.
Bagnell David
Baker Hughes Incorporated
Walker Zakiya
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