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perforations |
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perforations [‚pər·fə′rā·shənz] (graphic arts) Small rectangular sprocket holes along the edge of film. (petroleum engineering) Downwell holes made in well tubing, usually by shot-and-explosive or shaped-charge techniques; used for oil or gas production from desired horizons, or for injection of acidizing or fracturing fluids into the formation at predetermined depths. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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They got through the door and clambered with some difficulty up the nearly vertical passage, holding on desperately with toes and finger-tips, to the ventilating perforations in its floor. |
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