Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Reexamination Certificate
1999-11-12
2001-11-13
Tsay, Frank (Department: 3672)
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
C166S117500, C175S061000, C175S073000
Reexamination Certificate
active
06315044
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of preparing a hole for slant drilling, including the provision of pre-milled windows which can be oriented to any direction to provide an outlet for penetrating the earth at various depths along the casing string.
2. Description of the Prior Art
Well packers utilized for isolating a zone in a well below the packer from a zone above the packer for performing a well service operation such as perforating, formation, fracturing, or pressure containment are known. Further, it is known to use wireline apparatus to initially run a packer downhole to a selected position and to set the packer. After the packer has been set, the wireline is removed from the well and a tubing string is run down the well and attached to such packers for performing the well operations. The packer can then be remove from the well by manipulation of the tubing string and by shearing pins, one-direction setting devices, or other means, freeing the packer from the well casing and pulling the tubing string and packer out of the well as a unit. The packer can then be redressed and used again in the same well or used later at a different location.
It is also known to insert a whipstock into a well casing to provide a angled surface for directing a drill or similar tool outward from the centerline of the well towards a wall to drill through the casing wall and into the earth to tap a natural gas deposit at a particular depth.
It has not been possible prior to this invention to provide a pre-milled window in the casing in conjunction with an orientation device, which, when used in combination with the whipstock, allow a drill to be inserted and aligned with the window such that the drill can be manipulated through the window to contact the surrounding earth directly without having to drill through the casing.
None of the above inventions and patents, taken either singly or in combination, is seen to describe the instant invention as claimed.
SUMMARY OF THE INVENTION
Accordingly, it is a principal object of the invention to an orientation device and casing and packers for slant drilling outwardly from within a well.
It is another object of the invention to provide a pre-milled window for allowing a drill tool inserted in the well to pass through the window to contact and drill through the earth surrounding the well.
It is a further object of the invention to provide orientation devices to position the window facing a desired drilling direction relative to the earth, and to position the whipstock in a desire position relative to the window to guide the drill through the window to facilitate slant drilling.
Still another object of the invention is to provide a method of establishing a well casing having a plurality of windows along the casing for allowing slant drilling at predetermined locations along the well casing to slant drill at various depths along the well.
It is an object of the invention to provide improved elements and arrangements thereof in an apparatus for the purposes described which is inexpensive, dependable and fully effective in accomplishing its intended purposes.
These and other objects of the present invention will become readily apparent upon further review of the following specification and drawings.
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patent: 5957225 (1999-09-01), Sinor
Blackmon Robert N.
Tsay Frank
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