Horizontal drilling
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| 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 ones can be drilled for only $1-2 million U.S. | 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 ones 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. | + | Reusable drilling rigs that cost up to $16 million apiece are generally used for horizontally drilling [[Marcellus shale]] wells. These rigs are larger-sized ones with 1,000 and 1,600 horsepower. |
Revision as of 01:11, 2 November 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 can penetrates a much greater number of pockets of natural gas than it ever could with vertical drilling. On the average horizontal wells produce three to five times the amount of natural gas from vertical ones.
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 ones 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. These rigs are larger-sized ones with 1,000 and 1,600 horsepower.
