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Wellbore casing
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Patent number 6,705,395
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Issue date Mar 16, 2004
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Shell Oil Company
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Robert Lance Cook
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E21 - EARTH DRILLING MINING
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Liner hanger
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Patent number 6,568,471
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Issue date May 27, 2003
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Shell Oil Company
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Robert Lance Cook
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E21 - EARTH DRILLING MINING
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Coiled tubing apparatus
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Patent number 5,845,711
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Issue date Dec 8, 1998
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Halliburton Company
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Michael L. Connell
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E21 - EARTH DRILLING MINING
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Coiled tubing apparatus
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Patent number 5,762,142
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Issue date Jun 9, 1998
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Halliburton Company
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Michael L. Connell
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E21 - EARTH DRILLING MINING