Horizontal drilling method and apparatus
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United States of America Patent
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-
Dec 29, 1998
Grant Date -
N/A
app pub date -
Feb 26, 1997
filing date -
Feb 26, 1997
priority date (Note) -
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Abstract
An inverting liner system is used for installing a casing in a borehole without the need for drilling mud. The liner system includes a first portion with a diameter effective for supporting walls of said borehole and a second portion having a first end fixed to the liner portion at a point of attachment and a second distal end. The second liner portion has a diameter effective for surrounding the casing and inverting the casing within the first liner portion. A third liner portion has one end attached to the point of attachment of the first and second liner portions and a second end releasably attached to the distal end of the second liner portion during installation of the casing in the borehole. When casing installation is complete, the third liner portion is released from the second liner portion and the third liner portion may be withdrawn from the borehole, thereby inverting the first and second liner portions from about the casing and from within the borehole. In a particular embodiment, the casing and liner assembly are inverted within a canister for transportation and storage at a drilling site.
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