Horizontal drilling

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-	In order to tap natural gas with '''horizontal drilling''' typically a drill is sent down vertically a mile or so underground and then turned at a ninety degree angle horizontally into the shale. By using horizontal drilling the drill bit typically peneterates a much greater number of pockets of natural gas than it would ever with vertical drilling.	+	In order to tap natural gas with '''horizontal drilling''' typically a drill is sent down vertically a mile or so underground and then turned at a ninety degree angle horizontally into the shale. By using horizontal drilling the drill bit typically penetrates a much greater number of pockets of natural gas than it ever would do so with vertical drilling.
	The shale tends to be located between approximately five and eight thousand feet below ground.		The shale tends to be located between approximately five and eight thousand feet below ground.

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Revision as of 01:00, 27 October 2008

In order to tap natural gas with horizontal drilling typically a drill is sent down vertically a mile or so underground and then turned at a ninety degree angle horizontally into the shale. By using horizontal drilling the drill bit typically penetrates a much greater number of pockets of natural gas than it ever would do so with vertical drilling.

The shale tends to be located between approximately five and eight thousand feet below ground.

Horizontal wells are much more expensive to drill than vertical ones. Costs may run between $4 million and $7 million U.S. for a horizontal shale well. Vertical wells can be drilled for only $1-2 million U.S.

Reusable drilling rigs that cost up to $16 million apiece are generally used for horizontally drilling Marcellus shale wells.